Dilaton field and cosmic wave propagation

Ni, Wei-Tou

doi:10.1016/j.physleta.2014.09.049

Cited by 20 publications

(28 citation statements)

References 38 publications

(106 reference statements)

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“…Due to the experimental bounds provided recently by Ni, see [34], [35], the skewon effect must be very small. Thus we use the approximation (α, k) 2 << k 2 .…”

Section: Modification Of the Coulomb Lawmentioning

confidence: 99%

Photon propagator in skewon electrodynamics

Itin

2016

Phys. Rev. D

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Electrodynamics with a local and linear constitutive law is used as a framework for models violating Lorentz covariance. The constitutive tensor of such a construction is irreducibly decomposed into three independent pieces. The principal part is the anisotropic generalisation of the standard electrodynamics. The two other parts, axion and skewon, represent non-classical modifications of electrodynamics. We derive the expression for the photon propagator in the Minkowski spacetime endowed with a skewon field. For a relatively small (antisymmetric) skewon field, a modified Coulom law is exhibited.

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“…Due to the experimental bounds provided recently by Ni, see [34], [35], the skewon effect must be very small. Thus we use the approximation (α, k) 2 << k 2 .…”

Section: Modification Of the Coulomb Lawmentioning

confidence: 99%

Photon propagator in skewon electrodynamics

Itin

2016

Phys. Rev. D

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“…The i = 0 and i = 3 components of (70) both lead to the same modified Lorentz gauge condition in the dilaton field and the axion field in the O(1) order [63]:…”

Section: Wave Propagation and The Dispersion Relation In Dilaton Fielmentioning

confidence: 99%

Equivalence principles, spacetime structure and the cosmic connection

Ni¹

2016

Int. J. Mod. Phys. D

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After reviewing the meaning of various equivalence principles and the structure of electrodynamics, we give a fairly detailed account of the construction of the light cone and a core metric from the equivalence principle for the photon (no birefringence, no polarization rotation and no amplification/attenuation in propagation) in the framework of linear electrodynamics using cosmic connections/observations as empirical support. The cosmic nonbirefringent propagation of photons independent of energy and polarization verifies the Galileo Equivalence Principle [Universality of Propagation] for photons/electromagnetic wave packets in spacetime. This nonbirefringence constrains the spacetime constitutive tensor to high precision to a core metric form with an axion degree and a dilaton degree of freedom. Thus comes the metric with axion and dilation. Constraints on axion and dilaton from astrophysical/cosmic propagation are reviewed. Eötvös-type experiments, Hughes-Drever-type experiments, redshift experiments then constrain and tie this core metric to agree with the matter metric, and hence a unique physical metric and universality of metrology. We summarize these experiments and review how the Galileo equivalence principle constrains the Einstein Equivalence Principle (EEP) theoretically. In local physics this physcical metric gives the Lorentz/Poincaré covariance. Understanding that the metric and EEP come from the vacuum as a medium of electrodynamics in the linear regime, efforts to actively look for potential effects beyond this linear scheme are warranted. We emphasize the importance of doing Eötvös-type experiments or other type experiments using polarized bodies/polarized particles. We review the theoretical progress on the issue of gyrogravitational ratio for fundamental particles and update the experimental progress on the measurements of possible long range/intermediate range spin-spin, spin-monopole and spincosmos interactions.

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“…In the section 4, we keep the second term of (22) and follow Ref. [26,34] to find out dispersion relations for the case that the dilaton gradient and the axion gradient cannot be neglected. In the weak field or dilute medium, we assume…”

Section: Wave Propagation and The Dispersion Relationsmentioning

confidence: 99%

“…This has been done for the axion field in references [26,31,32,[59][60][61]. Here we follow the treatment in [34] to develop it for the joint dilaton field and axion field with the constitutive relation (49). Near the origin in a local inertial frame, the constitutive tensor density in dilaton field ψ and axion field φ [equation (49)] becomes…”

Section: Wave Propagation and The Dispersion Relation In Axion Field mentioning

confidence: 99%

On spacetime structure and electrodynamics

2016

Int. J. Mod. Phys. D

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Since almost all phenomena electrodynamics deal with have energy scales much lower than the Higgs mass energy and intermediate boson energy, electrodynamics of continuous media should be applicable and the constitutive relation of spacetime/vacuum should be local and linear. What is the key characteristic of the spacetime/vacuum? It is the Weak Equivalence Principle (WEP I) for photons/wave packets of light which states that the spacetime trajectory of light in a gravitational field depends only on its initial position and direction of propagation, and does not depend on its frequency (energy) and polarization, i.e. nonbirefringence of light propagation in spacetime/vacuum. With this principle it is proved by the author in 1981 in the weak field limit, and by Lammerzahl and Hehl in 2004 together with Favaro and Bergamin in 2011 without assuming the weak-field condition that the constitutive tensor must be of the core metric form with only two additional degrees of freedom - the pseudoscalar (Abelian axion or EM axion) degree of freedom and the scalar (dilaton) degree of freedom (i.e. metric with axion and dilaton). In this paper, we review this connection and the ultrahigh precision empirical tests of nonbirefringence together with present status of tests of cosmic Abelian axion and dilaton. If the stronger version of WEP is assumed, i.e. WEP II for photons (wave packets of light) which states in addition to WEP I also that the polarization state of the light would not change (e.g. no polarization rotation for linear polarized light) and no amplification/attenuation of light, then no Abelian (EM) axion and no dilaton, and we have a pure metric theory.Comment: 32 pages, 2 tables, review for the special issue on "Spacetime Structure and Electrodynamics" of International Journal of Modern Physics D, Vol. 25, No.14 (2016). arXiv admin note: substantial text overlap with arXiv:1512.0842

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Dilaton field and cosmic wave propagation

Cited by 20 publications

References 38 publications

Photon propagator in skewon electrodynamics

Photon propagator in skewon electrodynamics

Equivalence principles, spacetime structure and the cosmic connection

On spacetime structure and electrodynamics

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