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Unification of Maxwell Systems, Einstein, and Dirac Equations in Pseudo-Riemannian Space R1,3 by Clifford Algebra

Received: 23 November 2024     Accepted: 6 December 2024     Published: 25 December 2024
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Abstract

This paper presents the unification of Einstein's equations, Maxwell’s equation systems, and Dirac's equation for three generations of particles in the R1,3 pseudo-Riemannian space with torsion. The use of Dirac matrices as an orthonormal basis (in general, as a canonical basis) on the tangent plane permits the replacement of vectors with second-rank tensors. The symmetric component of the differential form DA (DA, where D is the Dirac operator, A is the tensor field, and • is the inner product) represents the deformation of the field, while the antisymmetric one (DɅA, Ʌ is the outer product) denotes the torsion. The differentiation of DA (i.e., DDA) yields an equation from which both Einstein's equation and the two independent Maxwell systems can be derived. The differentiation of the field deformation D(DA), that is, the gradient of the field divergence, yields a four-dimensional current. This four-current formulation results in nonlinearity in the inhomogeneous Maxwell's equations. In particular, the four-current J is not a constant in the inhomogeneous system of Maxwell's equations, DF = J. In accordance with this definition, a field singularity is defined as a source of current, or alternatively described as a "hole," which is a necessary component for the existence of the field. The description of field inhomogeneity (DA) in the form of biquaternions through complex hyperbolic functions in R1,3 permits the decomposition of DA into three pairs of spinors–antispinors (spinor bundle). The differentiation of spinors and the subsequent determination of eigenvalues and eigenfunctions yield three pairs of Dirac-type equations that are applicable to both bosons and fermions, which describe the fundamental particles of the three generations. The solution of Dirac-type equations in pseudo-Euclidean space for massless particles (eigenvalues m = 0) unifies the photon and three generations of neutrinos (γ, νe, νμ, ντ) into a single entity, namely, a singlet (photon) + a triplet (three generations of neutrinos).

Published in American Journal of Modern Physics (Volume 13, Issue 6)
DOI 10.11648/j.ajmp.20241306.13
Page(s) 102-111
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Einstein Equations, Maxwell Equations, Dirac Equations, Unified field theory, Pseudo-Riemannian Manifold R1,3, Biquaternions

1. Introduction
The use of new applications of algebra complements and expands the possibilities for describing physical processes. For example, the methods of Clifford algebra unite fundamental fields into a single field in pseudo-Riemannian space.
In this research, we will combine the homogeneous and inhomogeneous systems of equations of Maxwell, Einstein’s and Dirac's equations for three generations of particles using the generalized Clifford algebra method in R1,3 with torsion. In other words, we will create a single theoretical framework by combining the vector (electromagnetism), tensor (gravity), and spinor (fermions) fields into one field.
This study extends and generalizes previous research on Clifford algebra applications in field theory.
In contrast to the classical Clifford algebra, which is applicable to pseudo-Euclidean space (Minkowski ), the generalized Clifford algebra describes objects in non-Euclidean space, R1,3 . The incorporation of torsion in the Riemannian manifold R1,3 is a necessary condition for the unification of Maxwell's and Einstein's equations.
The representation of the differential form DA (D is the Dirac operator; A is a tensor field) in the form of generalized biquaternions permits the expression of DA (inhomogeneity) as the sum of three pairs of independent spinors - antispinors . Subsequently, Dirac-type equations are derived by differentiating the spinors-antispinors.
Using the Clifford product ab = a•b + ab (outer ab = (ab ba)/2 and inner a•b = (ab + ba)/2) instead of the usual scalar and vector products of vectors allows us to reconsider many previous concepts. For example, the divergence gradient D(DA) is interpreted as a four-dimensional electromagnetic current, thereby expanding its physical and geometric meaning.
2. Results
2.1. Theoretical Basis
Let be given a vector field A in a pseudo-Riemannian space R1,3:
A=i=03eiAi(1)
Formula (1) is the expansion of A in the basis {ei}.
Clarification. In classical Clifford algebra, ei are called vectors, but in fact, ei are 4x4 matrices related to the Dirac matrices (γ0, γ1, γ2, γ3) through the transition functions X = Xi (qj) by the formula:
ei=j=03γjXjqij=03γjiXj(2)
The basis {γi} of Dirac matrices is referred to as canonical:
γiγjjγi= ±2Iδij(3)
δij is the Kronecker delta and I is the identity matrix. If i= 0 and/or j = 0, then the sign “+” is used in (3). In other cases, the sign “-” is used.
Mathematically, ei are second-rank tensors. The terms "second-rank tensor" and "vector" are equivalent because Dirac matrices are employed as the orthonormal basis, rather than ordinary vectors (unit vectors).
Basis (3) greatly expands the concept of an orthonormal basis because it also includes ordinary (scalar and vector) vector products. This allows us to consider space not only with curvature (deformation) but also with torsion.
The terms “vector, bivector, trivector” accepted in Clifford algebra are quite acceptable, since the internal structure of the Dirac matrices and their products γi, γiγj, γiγjγk does not change, and therefore the name has no principled importance. The main objective is to satisfy Condition (3).
The movable (local) basis {ei} is connected to the canonical basis, which is drawn at the point of contact of the local tangent plane with the pseudo-Riemann surface. The basis vectors ei depend on the coordinates, that is, they change when moving “parallel to themselves” (in R1,3, along geodesic lines). Thus, ordinary differentiation must be replaced by covariant differentiation.
ei ej = eiej + eiej is the Clifford vector product :
eiej = (eiej + e ei)/2 is the inner product of vectors.
eiej = (eiej - e ei)/2 is the outer product of vectors or a bivector.
In general, eiej is a symmetric second-rank tensor obtained by the contraction of the dyadic product of two second-rank tensors , and then by symmetrization:
ei•ej= (ee
In particular, eiej = I gij, where gij is a metric tensor. In other words, eiej is the curvature of the metric, that is, a measure of the difference from flat space, a measure of deformation.
In general, eiej is an antisymmetric tensor of the second rank, obtained by the contraction of the dyadic product of two tensors and then by their antisymmetrization:
eiej= (ee
eiej denotes the torsion tensor . Module |eiej | is the area of the parallelogram constructed from vectors ei and ej. It is clear that eiej = – ejei.
In 3-dimensional space, the geometric meaning of the torsion tensor eiej is more obvious: eiej corresponds to the associated accompanying axial vector (dual, i.e., pseudovector) ek, which, like a screw, changes its direction depending on the replacement of ei and ej.
2.2. The Inhomogeneity of a Vector Field
We consider the gradient from A to:
DA=eiejDiAj(4)
In accordance with Clifford's product, Equation (4) can be separated into symmetric and antisymmetric components:
DA=ID•A+DA=Iei•ejDiAj+eiejDiAj(5)
where D = eiDi is the Dirac operator and Di is the symbol of covariant differentiation .
We refer to this (5) as the field inhomogeneity (DA), which
comprises the following:
1) field deformations:
I DA = Ieiej I Di Aj = Igij Di Aj = I Di Ai,
where Di Aj = Di Ai = Div A is a 4-dimensional divergence, a true scalar, and the first invariant of the DA , because gij Di Aj is the contraction of the tensor DA.
2) field torsion:
DA = eiej Di Aj = eiej (Di AjDj Ai)
DA is an antisymmetric second rank tensor. F = DA is the electromagnetic field tensor.
We again differentiate Equation (5). The DDA can then be written in two equivalent versions:
D(DA)= D(DA)+D•(DA)+D∧(DA)(6)
(DD)A =(DD)A+ (DD)•A +(DD)∧A(7)
Next, we will verify that (6) gives the system of Maxwell's equations and (7) gives Einstein's equation.
2.3. Homogeneous System of Maxwell's Equations
The last term in Equation (6) is equal to zero :
D∧(DA) =DF= 0(8)
(8) is a system of homogeneous Maxwell’s equations. We write (8) in coordinate form as
DF=EijknDkFij= 0(9)
where Eijkn is a contravariant antisymmetric tensor of fourth rank or Levi-Civita symbol .
2.4. Four-dimensional Electromagnetic Current
In Equation (6), the first term, D(DA), is identified using the density of the four-dimensional electromagnetic current:
j=D(DA)(10)
Then, the electric charge q and 3-dimensional current
q=e0e0j0=g00D0(DA)(11)
In a flat space, the charge and current have the following forms:
q0γ0j00j0,
since γ0γi = σi. where σi is a Pauli matrix.
Formula (11) has a clear geometric interpretation: the electric charge can be understood as the time derivative of the divergence of the field D0 (DA). Therefore, an electric charge has only two signs: “plus” or source, if D0 (DA) > 0 and “minus” or drain if D0 (DA) < 0.
The electric charge (±) can be represented as a "hole" in the field. Gauges, such as Lorentz and Coulomb gauges. can be understood as a method of removing singularities or sources of the field (current) with the aim of simplifying calculations.
2.5. Inhomogeneous System of Maxwell's Equations
The third-rank tensor D(DA) or trivector, or more precisely its part D∧(DA), is dual to the pseudovector , which is equal to zero, i.e. D∧(DA) is equivalent to the homogeneous system of Maxwell's equations (9) .
The remaining part is equivalent to the vector:
D(DA) =μTA(13)
The inner product TA gives a vector, as does the right side of equation (6). T is a second-rank tensor; μ is the proportionality coefficient. The properties of T and μ will be defined later.
Considering (10), (13), and F = DA, we obtain an inhomogeneous system of Maxwell's equations:
DF=μTAj=J(14)
When μTA = 0, (14) has the classical form. For values of μTA ≠ 0, the inhomogeneous system of Maxwell's equations is nonlinear, that is, the effective charge J (right-hand side of (14)) is not constant; it increases or decreases depending on the growth of μTA (charge screening).
2.6. Continuity Equation
The differentiation of (14) gives the continuity equation:
μT• (DA) –Dj= 0,(15)
because D•(DF) = 0 and (DT) •A = 0 . The inner product of the vectors is used in Eq. (15).
Formula (15) in general is a differential form of the law of conservation of energy-momentum in an elementary volume, i.e., the law of conservation of 4-current.
We write Equation (15) in the coordinate form and transform the left side.
μTknAnk= 0.5μ(gnkgijTkinAj+gnkgijTkiDjAn)=
= 0.5μgnkgijTki(DnAj+ DjAn) = 0.5μTnjεnj
Then, we obtain the continuity equation in the form :
0.5μTnjεnjDkjk= 0(16)
εnj = 0.5 (Dn Aj + Dj An) is the deformation tensor.
The four-current jk consists of the sum of the positive and negative currents:
jkj+kj-k(17)
Equation (16) represents the law of conservation of four-currents during field deformation. The deformation of electromagnetic and/or gravitational fields gives rise to the creation of pairs of positive and negative electric charges (particles + antiparticles), resulting in a constant total charge.
From (16), it is clear that tensor T (13) is the energy -momentum tensor.
2.7. Law of the Conservation of Eddy Currents or Electromagnetic Induction
By differentiating (14), we obtain the law of conservation of the eddy current :
DJ= 0(18)
D∧(D F) = 0, because D F is “scalar”.
Equation (18) represents the law of conservation of eddy currents, also known as Faraday’s law of electromagnetic induction (Faraday's law) . Note that in (18), the outer product of the vectors is employed.
Formula (18) in the usual 3-dimensional form looks like :
▽-ρ+ ∂t
where ρ is the electric charge density; ∂t
Let the current carriers be positive charges and ρ1 < ρ2. For simplicity, we let ▽ρ = const. Then, the change in current over time (in general, -▽ρ + ∂t
Within the framework of generalized Clifford algebra, we combined two independent Maxwell system equations into a single equation: In addition, we derived conservation laws for the four-current.
Figure 1. Eddy currents conservation.
2.8. Einstein's Equations
We now obtain Einstein's equation from Equation (7). Because
(DD)∧A = 0, (DD)A = μTA, (DD)A = D2A = □A, where □ is the D’Alembert operator,
(DD)•A = - RicA,
where Ric is the Ricci tensor, we can write Equation (7) in the following form:
μTA=DDARicA(20)
According to the Lichnerowicz formula :
A =BA+ 0.5ℛic(A),(21)
where □A = eiejek Di Dj Ak is the action of the Lichnerowicz operator on vector A;
B A ≡ – tr (□A) = – eieiek DiDiAk is the action of the Bochner Laplacian on Ak (on a scalar). This is the trace of □A, or the “rough” D’Alembertian;
λk are the eigenvalues of each eigenfunction (scalar!) Ak of the operator ▽•▽:
ℛic(A) = eiejek Rij Ak = gijek Rij Ak = ekAk R;
R is the scalar curvature.
Then, considering (21), from (20), we obtain the Einstein equation:
Ric– 0.5R+λ= –μT(22)
λk represent the eigenvalues of the Bochner operator:
ei•eiDiDiAkknλnAk
From (22), we can determine the coefficient μ. μ = – 8 π k/c4 .
Furthermore, it is assumed that all components of the vector Ak (without ek) are a scalar function, i.e., each scalar function Ak corresponds to its own number λk (there are four of them).
Einstein's equation (22) can be derived by differentiating Eq. (20) . The proof is provided in Appendix 1.
Obtaining Einstein equation (22) by direct calculation from the inhomogeneous system of Maxwell equations in curvilinear coordinates proves the validity of the Lichnerowicz formula (21) for the case of a 4-dimensional pseudo -Riemannian space. Thus, from an inhomogeneous system of Maxwell equations, we obtain the Einstein equation.
2.9. Biquaternions, Bispinors
We square the field inhomogeneity (5), which consists of symmetric and antisymmetric parts, as follows:
(DA)2= (DA+DA)2
(DA)2= (DA)2+2 (DA)DA+(DA)2(23)
whereDA=
γ = γ0γ1γ2γ3 is the matrix analogue of the imaginary unit: (γ)2 = (γ0γ1γ2γ3)2 = – I.
Substituting
(DA)2=SR + SP + VR + VP(25)
where
SR = (DA)2I is scalar,
SP = – 0.25 γ Eijkn FijFkn is pseudoscalar;
VR = eαe0 Fα0 (DA) is bivector;
VP = γ (eα e0) Eβλα0 Fβλ (DA) is pseudobivector.
Greek letters take the values 1, 2, 3.
SR, SP, VR and VP are expressed using hyperbolic functions:
SR = |τα0| |τβ0| cosh((ηα + ηβ)/2) cosh(γ (φα + φβ)/2);
SP = |τα0||τβ0| sinh((ηα + ηβ)/2) sinh(γ (φα + φβ)/2);
VR = τα0β0|(sinh((ηα + ηβ)/2) cosh(γ (φα + φβ)/2) – sinh((ηα – ηβ)/2) cosh(γ (φα – φβ)/2));
VP = τα0β0|(cosh((ηα + ηβ)/2) sinh(γ (φα + φβ)/2) – cosh((ηα – ηβ)/2) sinh(γ (φα – φβ)/2))
where
τα0 = eαe0, |τα0| = (g g g00 gαα)0.5,
ηα is rapidity or angle of rotation on a hyperplane xα0t,
φα is angle of spatial rotation around an axis xα.
Substituting the new notations SR, SP, VR, and VP into (25), and simplifying and extracting the square root, we obtain:
DA=α=13Rα=α=13(τα0coshzα2+τα0sinzα2)(26)
where zα = α + γ φα.
In (25), we change the order of multiplication of bivectors eαe0 = – e0eα, in general, for all even Clifford numbers: eiej, eiej, eiejeken . By repeating the procedure that we have already performed, we obtain:
DÃ=α=13R̃α=α=13(τ0αcoshzα2+τ0αsinzα2)(27)
Rα and R̃α are referred to as generalized biquaternions and antibiquaternions, respectively. They described rotations on Riemann surfaces (on tangent planes x0y, z0y, y0z, t0x, t0y, t0z).
Formula (27) means that the field inhomogeneity DA is the sum of three biquaternions (antibiquaternions). Mathematically, biquaternions are second-rank tensors.
In the Minkowski space, where ei are replaced by Dirac matrices γi, biquaternions assume the form of a matrix exponential :
RαR̃α=Icoshzα2±γαγ0sinzα2=exp(±γαγ0zα2)(28)
Thus, it is difficult to overestimate the role of biquaternions in physics. Any transformations of a vector, including those in curvilinear coordinates, are performed by biquaternions :
x'=RαxR̃α/τ0α2(29)
Using Euler's formulas, we write the biquaternion Rα as:
Rα=τα0expzα2+exp-zα22+τα0expzα2-exp-zα22or
Rα=(τα0+τα0)expzα22+(τα0-τα0)exp-zα22(30)
where
Ψα=τα0+τα0expzα22=τα0+τα0Φα(31)
Ψ̃α=τα0-τα0 exp-zα22=τα0-τα0Φ̃α(32)
In general
ΦαΦ̃α=12exp±zα2=12exp±IXα+γYα2(33)
Xα(qi) and Yα(qi) are scalar functions.
Ψα and Ψ̃α will be called generalized bispinor - antibispinor .
According to the strict terminology of algebra, an ideal of a ring K is a subring k for bK and Sk the equality holds :
bS=cS
where c is a real number. If c > 0, then S is a positive ideal, if c < 0, then S is a negative ideal. In physics, ideals are associated with spinors: if c > 0, then S=Ψα is a bispinor, if c < 0, then S=Ψ̃α is an antibispinor.
Really,
τα0Ψα=(eαe0eαe0+eαe02)Φα=
=τα0τα0+τα0Φα=τα0Ψα,
Since c=τα0>0, then Ψα is a bispinor. The anti-bispinor can be similarly checked:
τα0Ψ̃α=eαe0eαe0-eαe02Φ̃α=
=τα0τα0-τα0Φ̃α=-τα0Ψ̃α
It can be verified that all three ideals (α = 1, 2, 3) are two-sided (left- or right-hand multiplication of τα0 is equal), since τα0 commutes with Φα and Φ̃α.
Spinors and antispinors are independent . The equality
α=13(μαΨα+μ̃αΨ̃α)=0
is satisfied if all real numbers (μα, μ̃α) are equal to zero.
From (30), it is evident that a biquaternion is the sum of a spinors and antispinors. In the general case, the field inhomogeneity DA (26) consists of three generalized biquaternions Rα, that is, three pairs of independent spinors and antispinors . Because DA is a second-rank tensor, we can say that biquaternions, bispinors, and antibispinors are also second-rank tensors (Ψα0). In simple terms, a spinor field is a spinor bundle of a tensor, that is, a DA inhomogeneity.
2.10. Dirac Type Equations
By differentiating bispinors (31) and (32), and finding the eigenvalues and eigenbispinors, we obtain Dirac-type equations in covariant form:
D(ΨαΨ̃α)=mΨαΨ̃α(34)
We write Equation (34) in the coordinate form as:
eiIτα0+eαe0DiΦα0=IgmjΨα0
or
τα0ei+eiτα0+eiτα0DiΦα0=IgmjΨα0(35)
τα0=eαe0
Equation (35) is a Dirac-type equation expressed in the coordinate form. No summation for α, and 0.
In Minkowski space, equation (34) assumes the form of classical Dirac equations:
γiiΨαΨ̃α=-mαΨαΨ̃α(36)
where
ΨαΨ̃α=I±γαγ0ΦαΦ̃α=I±γαγ02e±IXα+γYα2(37)
3. Calculations
Equation (36) was solved for massless particles . Below, we discuss several important aspects.
Let α=3.
3.1. Solutions for Neutrinos
We consider (37) with only field torsion (without deformation) as follows:
γiγ3γ0UTiexp(I+γ)px2=0,(38)
where
UT=(u0, u1, u2, u3)T is a constant column vector;
γi are the Dirac matrices in the Weyl representation;
px=Ipixi, pi denotes the four-vector energy momentum.
In two-component (block) spinors, the solutions of (38) are given by:
ψ31,2=(-p3p1+ip2+p1-ip2p3)e(I+γ)px2p0(39)
ψ33,4=-(-p3p1+ip2+p1-ip2p3)e(I+γ)px2p0(40)
It is evident that the solutions ψ31,2 and ψ33,4 differ only in sign. Simply put, ψ31,2 and ψ33,4 describe the same particle. A change in helicity is observed when a particle transitions from state ψ31 to ψ32 as well as from ψ33 to ψ34. This phenomenon is illustrated in Figure 2. If the helicity was left-handed, then it would be right-handed in the opposite direction. Helicity is not a P-parity-invariant quantity.
The particle is its own antiparticle, that is, solution (38) does not change if we change the
exp(I+γ)px/2to theexp-(I+γ)px/2.
However, each state, ψα1 and ψα2 (also ψα3 and ψα4), behaves as independent, separate particles.
Solutions (39) and (40) can be written in compact form as follows:
ψ3=(σ1p1+σ2(±p2)+σ3(p3))exp(I+γ)px2p0(41)
The upper signs before the impulses refer to the solution ψ31,2, and the lower signs refer to ψ33,4.
ψα and ψ̃α are obtained from the torsion of the field (without deformation); thus, they must be antisymmetric functions. To verify this, we considered the wave function of a system comprising two identical non-interacting particles and performed a swap operation on them:
ψα,β=pexp(I+γ)px2p0qexpI+γqx2q=
=-qexpI+γqx2qpexpI+γpx2p0=-ψβ,α
The wave function of the superposition of two identical, non-interacting particles changes sign when the particles are permuted. The particles described by the function ψα are fermions. Equations (36) and (37) are equivalent to Dirac equations for fermions.
Because ψ3 is a spinor and the mass of this fermion is zero, the particle itself is one of the three generations of neutrinos. The equations for the remaining generations can be solved similarly.
3.2. Solutions for Photon
Now, we consider (37) without field torsion, that is, only with deformation:
γiUTiexp(I+γ)px2=0(42)
In two-component spinors, the solutions of (42) are as follows:
χ31,2=(p3p1+ip2+p1-ip2-p3)exp(I+γ)px2p0(43)
χ33,4=-(p3p1+ip2+p1-ip2-p3)exp(I+γ)px2p0(44)
Solutions (43) and (44), that is, χ31,2 and χ33,4, differ only in terms of sign.
Functions χ31,2 and χ33,4 describe the same particle. Moreover, the particle is its own antiparticle with a mass of zero.
Upon transitioning from state χ31 to χ32 (and similarly from χ33 to χ34), the helicity of the particle remained unaltered, maintaining a right-handed polarization (Figure 3). There is no difference between particles and antiparticles.
Solutions (43) and (44) can be written in compact form as follows:
χ3=(σ1p1+σ2(±p2)+σ3(±p3))exp(I+γ)px2p0(45)
The upper signs before the impulses refer to the solution χ31,2, and the lower signs refer to χ33,4.
It is clear that χα and χ̃α are derived from field deformation (without torsion), and they must be symmetric functions. To verify this, we consider the wave function of a system of two identical noninteracting particles and swap them as follows:
χα,β=pexp(I+γ)px2p0qexpI+γqx2q=
=qexpI+γqx2qpexpI+γpx2p0=χβ,α
The wave function of the superposition of two identical noninteracting particles remained unchanged when the particles were rearranged. The particles described by the function χα are bosons. Equations (43) and (44) are equivalent to Dirac equations for bosons.
Given that function (45) is an function χ3 for a boson, it can be inferred that the particle corresponding to it is a boson. The mass of this boson is zero, and there exist only two possible states. Based on these observations, it was concluded that the particle in question is a photon.
We have considered a photon in a flat isotropic space. In such a space, all three "generations" of photons are identical. In a Riemannian, and even more so in the anisotropic space τα0, the photon (boson) will be different for each "direction" of α0.
4. Conclusions
1) Clifford algebra in the pseudo-Riemannian space R1,3 with torsion and spinor bundles can be employed to unify gravitational, electromagnetic, and spinor fields into a single structure. Field deformation is a prerequisite for gravity, and torsion is a prerequisite for electromagnetism. The existence of a spinor field is contingent on the presence of deformation, torsion, and the spinor bundle.
2) The tensor basis method and Clifford product of vectors permit the consideration of both deformation and torsion within the field, thereby facilitating the unification of the Einstein equation and Maxwell system of equations. Einstein and Maxwell's equations are equivalent. Einstein's equations describe spatial quantities including the Ricci tensor and scalar curvature. Maxwell's equations describe field quantities such as the electromagnetic field tensor, 4-current, etc.
3) The inhomogeneity of the DA field can be represented by the sum of the three biquaternions, each of which splits into a pair of bispinors. Differentiation of the bispinors yields three Dirac-type equations for the bosons and fermions. So the solution of Dirac-type equations with deformation describes a boson, whereas the solution with torsion describes a fermion.
In a four-dimensional space, there are only three biquaternions: R10, R20, and R30. Consequently, there could only be three particle generations.
Massless particles, photon, and three generations of neutrinos (γ, νe, νμ, ντ) were combined into a single structure: singlet (photon) + triplet (three neutrinos).
4) The divergence gradient (D(D•A)) is a 4-dimensional electromagnetic current. This formulation of the four-current gives the nonlinearity of the inhomogeneous Maxwell system and the laws of conservation of the four-current and eddy currents. It also clearly shows the geometric meaning of singularities – field "holes," i.e., current sources and the need for calibrations such as Lorentz, Coulomb, and others.
Acknowledgments
It would be unfair to not thank my alliance, my wife Lyubov Gomazkova, for her selfless and colossal help, without which this work would hardly have come into being. Furthermore, I would like to express my gratitude to all those who contributed to this work.
Author Contributions
Alimzhan Kholmuratovich Babaev is the sole author. The author read and approved the final manuscript.
Conflicts of Interest
The author declares no conflicts of interest.
Appendix
D•(□ARicA) =D•(μTA)
In coordinate form:
en•ekDn(□AkApRpk) =en•ekDn(μApTpk)
By simplifying we get:
gnkDn(gijDiDjAk) –gnkDn(ApRpk) =μgnkDn(ApTpk)
Dk(gijDiDjAk) –Dk(AiRki) =μDk(AiTki)
We open brackets under differentiation:
DkDiDjAk– DkAiRki– AiDkRki=μDkAiTki+μAiDkTki(A-1)
It is known that Dk Rki = 0.5 Di R
and according to formula (16) μ Dk Ai Tki = Dk jk.
Then, (A-1) takes the form:
DkDiDjAk– DkAiRki– 0.5AiDiR = Dkjk+μAiDkTki(A-2)
In the first term we change the differentiation order (k with i).
Dn Di Dj Ak = Di Dn Dj Ak,
because
gij (Dk Di Dj AkDi Dk Dj Ak) =
=gij (Dp Ak RpjikDj Ap Rkpik) = – Dp Ak Rpk + Dj Ap Rip = 0.
Now in Di Dk Dj Ak we change the order of differentiation (k with j):
gijDi(DkDjAk– DjDkAk) =gijDi(–ApRkpjk) =
=Di(ApRjp) =DiApRjp+ApDiRjp
orgijDiDkDjAk=gijDiDjDkAk+ DiApRjp+ ApDiRjp
Considering that according to formula (10)
ejDj Dk Ak = j is a four-dimensional electromagnetic current, from the last equality, we obtain:
gijDkDiDjAk= Diji+ DiApRjp+ ApDiRjp(A-3)
(A-3) substitute into (A-2):
Dkjk+ DkApRkp+ ApDkRkp– DkApRkp– 0.5 AiDiR=
=Dkjk+μApDkTkp
Now, we reduce the four currents and simplify:
DkRkp– 0.5δkiDkR =μDkTkp
“Getting rid” of differentiation, we obtain Einstein’s equation:
Rkp– 0.5δkiRkiλi=μTkp(A-4)
λi are the cosmological constants or eigenvalues of the Bochner operator.
References
[1] Chris J. L. Doran. Geometric Algebra and its Application to Mathematical Physics. Sidney Sussex College. A dissertation submitted for the degree of Doctor of Philosophy in the University of Cambridge. February 1994,
[2] L. D. Landau and E. V. Lipschitz, The Classical Theory of Fields, vol. 2. pp. 70 – 80, 295 – 301.
[3] Wikipedia. Dirac equation, Available from:
[4] Wikipedia. Minkowski spacetime, Available from:
[5] Wikipedia. Einstein – Cartan theory. Available from:
[6] A. Kh. Babaev. Biquaternions, rotations and spinors in the generalized Clifford algebra. sci-article, №45 (May) 2017,
[7] Wikipedia. Tensor product, Available from:
[8] Wikipedia. Torsion tensor, Available from:
[9] Wikipedia. Dirac operator, Available from:
[10] Wikipedia. Covariant derivative, Available from:
[11] Wikipedia. Main invariants of the tensor. Available from:
[12] A. Kh. Babaev. An alternative formalism based on Clifford algebra. sci-article, №40 (December) 2016, (In Russian).
[13] Wikipedia. Levi - Civita epsilon. Available from:
[14] Wikipedia. Gauge fixing. Available from:
[15] A. Kh. Babaev. Four-dimensional current conservation law in a Clifford algebra-based formalism. sci-article, №42 (February) 2017. pp. 27 – 33. Preprint
[16] Faraday’s law.
[17] Peter Petersen. Demystifying the curvature term in Lichnerowicz Laplacians.
[18] Bochner Laplacian.
[19] A. Kh. Babaev. Equivalence of the inhomogeneous system of Maxwell's equations and Einstein's equations. sci-article, №43 (March) 2017.
[20] Wikipedia. Electromagnetic tensor. Available from:
[21] Wikipedia. Matrix exponential. Available from:
[22] A. Kh. Babaev. Description of Lorentz transformations, the Doppler effect, Hubble's law, and related phenomena in curvilinear coordinates by generalized biquaternions. December 2024,
[23] Wikipedia. Prime ideal. Available from:
[24] Wikipedia. Spinors. Available from:
[25] A. Kh. Babaev. Derivation of the Dirac equation from the inhomogeneity of space and solution for neutrino generations. sci-article, №52 (December) 2017.
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    Babaev, A. K. (2024). Unification of Maxwell Systems, Einstein, and Dirac Equations in Pseudo-Riemannian Space R1,3 by Clifford Algebra. American Journal of Modern Physics, 13(6), 102-111. https://doi.org/10.11648/j.ajmp.20241306.13

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    Babaev, A. K. Unification of Maxwell Systems, Einstein, and Dirac Equations in Pseudo-Riemannian Space R1,3 by Clifford Algebra. Am. J. Mod. Phys. 2024, 13(6), 102-111. doi: 10.11648/j.ajmp.20241306.13

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    AMA Style

    Babaev AK. Unification of Maxwell Systems, Einstein, and Dirac Equations in Pseudo-Riemannian Space R1,3 by Clifford Algebra. Am J Mod Phys. 2024;13(6):102-111. doi: 10.11648/j.ajmp.20241306.13

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  • @article{10.11648/j.ajmp.20241306.13,
      author = {Alimzhan Kholmuratovich Babaev},
      title = {Unification of Maxwell Systems, Einstein, and Dirac Equations in Pseudo-Riemannian Space R1,3 by Clifford Algebra
    },
      journal = {American Journal of Modern Physics},
      volume = {13},
      number = {6},
      pages = {102-111},
      doi = {10.11648/j.ajmp.20241306.13},
      url = {https://doi.org/10.11648/j.ajmp.20241306.13},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmp.20241306.13},
      abstract = {This paper presents the unification of Einstein's equations, Maxwell’s equation systems, and Dirac's equation for three generations of particles in the R1,3 pseudo-Riemannian space with torsion. The use of Dirac matrices as an orthonormal basis (in general, as a canonical basis) on the tangent plane permits the replacement of vectors with second-rank tensors. The symmetric component of the differential form DA (D•A, where D is the Dirac operator, A is the tensor field, and • is the inner product) represents the deformation of the field, while the antisymmetric one (DɅA, Ʌ is the outer product) denotes the torsion. The differentiation of DA (i.e., DDA) yields an equation from which both Einstein's equation and the two independent Maxwell systems can be derived. The differentiation of the field deformation D(D•A), that is, the gradient of the field divergence, yields a four-dimensional current. This four-current formulation results in nonlinearity in the inhomogeneous Maxwell's equations. In particular, the four-current J is not a constant in the inhomogeneous system of Maxwell's equations, D•F = J. In accordance with this definition, a field singularity is defined as a source of current, or alternatively described as a "hole," which is a necessary component for the existence of the field. The description of field inhomogeneity (DA) in the form of biquaternions through complex hyperbolic functions in R1,3 permits the decomposition of DA into three pairs of spinors–antispinors (spinor bundle). The differentiation of spinors and the subsequent determination of eigenvalues and eigenfunctions yield three pairs of Dirac-type equations that are applicable to both bosons and fermions, which describe the fundamental particles of the three generations. The solution of Dirac-type equations in pseudo-Euclidean space for massless particles (eigenvalues m = 0) unifies the photon and three generations of neutrinos (γ, νe, νμ, ντ) into a single entity, namely, a singlet (photon) + a triplet (three generations of neutrinos).
    },
     year = {2024}
    }
    

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  • TY  - JOUR
    T1  - Unification of Maxwell Systems, Einstein, and Dirac Equations in Pseudo-Riemannian Space R1,3 by Clifford Algebra
    
    AU  - Alimzhan Kholmuratovich Babaev
    Y1  - 2024/12/25
    PY  - 2024
    N1  - https://doi.org/10.11648/j.ajmp.20241306.13
    DO  - 10.11648/j.ajmp.20241306.13
    T2  - American Journal of Modern Physics
    JF  - American Journal of Modern Physics
    JO  - American Journal of Modern Physics
    SP  - 102
    EP  - 111
    PB  - Science Publishing Group
    SN  - 2326-8891
    UR  - https://doi.org/10.11648/j.ajmp.20241306.13
    AB  - This paper presents the unification of Einstein's equations, Maxwell’s equation systems, and Dirac's equation for three generations of particles in the R1,3 pseudo-Riemannian space with torsion. The use of Dirac matrices as an orthonormal basis (in general, as a canonical basis) on the tangent plane permits the replacement of vectors with second-rank tensors. The symmetric component of the differential form DA (D•A, where D is the Dirac operator, A is the tensor field, and • is the inner product) represents the deformation of the field, while the antisymmetric one (DɅA, Ʌ is the outer product) denotes the torsion. The differentiation of DA (i.e., DDA) yields an equation from which both Einstein's equation and the two independent Maxwell systems can be derived. The differentiation of the field deformation D(D•A), that is, the gradient of the field divergence, yields a four-dimensional current. This four-current formulation results in nonlinearity in the inhomogeneous Maxwell's equations. In particular, the four-current J is not a constant in the inhomogeneous system of Maxwell's equations, D•F = J. In accordance with this definition, a field singularity is defined as a source of current, or alternatively described as a "hole," which is a necessary component for the existence of the field. The description of field inhomogeneity (DA) in the form of biquaternions through complex hyperbolic functions in R1,3 permits the decomposition of DA into three pairs of spinors–antispinors (spinor bundle). The differentiation of spinors and the subsequent determination of eigenvalues and eigenfunctions yield three pairs of Dirac-type equations that are applicable to both bosons and fermions, which describe the fundamental particles of the three generations. The solution of Dirac-type equations in pseudo-Euclidean space for massless particles (eigenvalues m = 0) unifies the photon and three generations of neutrinos (γ, νe, νμ, ντ) into a single entity, namely, a singlet (photon) + a triplet (three generations of neutrinos).
    
    VL  - 13
    IS  - 6
    ER  - 

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Author Information
  • Department Physics, National University of Uzbekistan, Tashkent, Republic of Uzbekistan; Department of Applied Mathematics and Computer Science, Novosibirsk State Technical University, Novosibirsk, Russian Federation

    Biography: Alimzhan Kh. Babaev defended his thesis for a PhD in physical and math sciences on the topic “Multiple collisions of particles and fragmentations of 22Ne nuclei in a photoemulsion at P/A=4.1 GeV/c” in 1989 at the Institute of Nuclear Physics of the Academy of Sciences of Uzbekistan (Tashkent). He worked at the Department of Nuclear Physics and Cosmic Rays at the National University (Tashkent, Uzbekistan) as an associate professor. Since 2000, he has worked as a lecturer at the Novosibirsk State Technical University (Novosibirsk, Russian Federation) in the Department of Higher Mathematics. At present, he is working as an independent researcher in the field of applications of methods of abstract algebra to classical and quantum field physics. He is the author (co-author) of more than 30 scientific papers published in peer-reviewed journals.

    Research Fields: Clifford algebra, Gravity, Electromagnetism, Biquaternions and Spinor fields, Partial differential equations, Unified field theory.

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    1. 1. Introduction
    2. 2. Results
    3. 3. Calculations
    4. 4. Conclusions
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  • Acknowledgments
  • Author Contributions
  • Conflicts of Interest
  • Appendix
  • References
  • Cite This Article
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