共查询到20条相似文献,搜索用时 15 毫秒
1.
S. Antoci 《General Relativity and Gravitation》1989,21(2):171-183
Previous work on a class of exact solutions to the field equations of Einstein's unified field theory has shown that some of these solutions acquire an immediate physical meaning as soon as one allows for external sources, as it occurs in the general theory of relativity. It is evident that a four-current density j
i
, appended to the right-hand side of the field equation
, has a fundamental role: in some solutions, a string built with this current density gives rise to partons, mutually interacting with forces that do not depend on distance, like the ones invoked to explain the confinement of quarks. In other solutions, for which
obeys Maxwell's equations, ji clearly displays electrical behavior. In the present paper it is shown under what conditions the electrical behavior of a charged test particle can be extracted from the field equations and from conservation identities related to the theory, when sources are appended in the way proposed by Borchsenius and Moffat. 相似文献
2.
George L. Murphy 《International Journal of Theoretical Physics》1979,18(5):323-327
Einstein's concept of the strength of a system of field equations, which has been related in a simple way to the amount of initial data required for the system, is examined for his last unified field theory. The apparently surprising weakness of this system is traced to the high order of the associated electromagnetic field equations. These equations allow the existence of purely electric longitudinal waves, in spite of the absence of any photon mass. 相似文献
3.
This paper reviews the recent progress in the nonsymmetric unified field theory of Einstein and Straus and its current status as a theory of macrophysics of gravitation and electromagnetism. 相似文献
4.
We formulate the quasienergy pseudopotential methods, allowing us to study the behavior of the electronic structure of a material in a coherent electromagnetic field. We show that after canonical transformation, we can look for the solution to the nonsteady-state Schrödinger equation in a basis of wave functions from extended Hubert space, substituting the quasienergy pseudopotential for the true nonsteady-state electronic potential. We prove that the familiar compensation theorem remains valid even in this case.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 33–37, February, 1992. 相似文献
5.
We investigate electromagnetic effects in the framework of chiral perturbation theory. Using a completely independent method, we confirm Urech’s results for the divergences of the one-loop functional in the electromagnetic sector. We perform a one-loop analysis of allP t2 (P=π, K, η) and theK t3 form factors $f_ + ^{K^ + \pi ^o } (0),f_ + ^{K^o \pi ^ - } (0)$ , including a systematic treatment of theO(e 2 p 2) contributions in the mesonic part. We illustrate our results by several numerical estimates. 相似文献
6.
Hans-Jürgen Treder 《General Relativity and Gravitation》1992,24(5):537-541
In general relativity the non-covariant ansatzA
i
=
4
i for the vectorpotentialA
k
gives the general solution of the Maxwell equations as four coordinate conditions which are the conditions of integrability of the Einstein equations. In the some sense the ansatz=X
4 is a general solution of the scalar wave-equation in a reference system given by one coordinate-condition. We discuss the meaning of the canonical quantization of the fields in such reference systems. 相似文献
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10.
Li Wang 《International Journal of Theoretical Physics》1981,20(4):257-261
In unified field theory we derive expressions for the electric current densities j and. We show that j and depend on the intensitiesE andH;E andH possess a common limit 1/; and Coulomb's law is not compatible with the unified theory. 相似文献
11.
12.
P. F. Browne 《Foundations of Physics》1975,5(3):387-398
In Kaluza's five-dimensional unified field theory the restriction for the 55 component of the metric tensor 55=1 demands that the 15 equations for the unified field be weakened. Equations which have been proposed have identically vanishing trace. The equations then admit only a radiation field as source of the gravitational field. By relaxing the condition, this limitation is avoided, while retaining the striking successes of the five-dimensional approach. A scalar function, determined by the 15th field equation apart from integration constants, provides source terms for both the gravitational and electromagnetic fields, in the latter case of polarization type. 相似文献
13.
M. F. Tautz 《Foundations of Physics》1975,5(1):63-74
We discuss, within the framework provided by a recently developed variational method, transposition-invariant field equations for unified field theories. Systems that are, in addition, invariant under Weyl-type gauge transformations or lambda transformations are derived. It is found that in a weak field limit two of the systems contain the equations of general relativity and the covariant Maxwell equations for a charge-free region. 相似文献
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15.
《Physics letters. [Part B]》1987,194(2):267-270
When quantising a classical field theory it is not automatic that a group of symmetries of the classical system is preserved as a symmetry of the quantum system. Apart from the phenomenon of symmetry breaking it can also happen (as in Faddeev's Gauss law anomaly) that only an extension of the classical group acts as a symmetry group of the quantum system. We show here that rather than signalling a failure of the associative law as has been suggested in the literature, the occurrence of a non-trivial three-cocycle on the local gauge group is an “anomaly” or obstruction to the existence of an extension of the local gauge group acting as a symmetry group of the quantum system. 相似文献
16.
It is shown that if zero-point oscillations are assumed to exist, quantum field theory will lack the determinism of classical
physics.
Scientific Research Institute for Nuclear Physics, Moscow University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii,
Fizika, No. 5, pp. 71–74, May, 1996. 相似文献
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18.
E. Schmutzer 《Annalen der Physik》1995,507(3):251-261
New field equations of the Projective Unified Field Theory are presented which avoid potential difficulties of former versions with respect to the equivalence principle. The physical interpretation of this new version remains unchanged: constancy of the “gravitational constant”, electromagnetic polarization of the vacuum, definiteness of the energy of the stationary scalaric field, etc. Furthermore, the Klein-Gordon field and the Dirac field are treated. 相似文献
19.
Kaare Borchsenius 《General Relativity and Gravitation》1976,7(6):527-534
The field equations, in the new formulation of Einstein's unified field theory, are extended from the present vacuum form to the general case in which sources are present. In this generalization the contracted torsion tensor corresponds to the electromagnetic four-potential. By this correspondence, Einsteins-gauge transformation becomes identical to the ordinary electromagnetic gauge symmetry. The generalized Bianchi identities are found and used to discuss deviations from the Einstein-Lorentz equations of motion. 相似文献
20.
D. N. Pant 《General Relativity and Gravitation》1972,3(1-2):29-33
The possibility of the existence of localized charged distribution giving rise to a special axially symmetric electrostatic field has been explored in Einstein's unified field theory [2]. The field equations have been studied in two particular cases. In one case the field equations have a solution representing flat space-time along with an electrostatic field which is constant in the direction of the axis of symmetry. For the other case the solution is non-existent. 相似文献