Parity-violating gravitational coupling of electromagnetic fields

Majumdar, Parthasarathi; SenGupta, Soumitra

doi:10.1088/0264-9381/16/12/102

Cited by 86 publications

(146 citation statements)

References 27 publications

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“…The interpretation of the KR field [15,7] as a torsion in the background spacetime [16], inevitably implies a study of electromagnetism in torsion backgrounds. In this context, the gauge U (1) Chern-Simons term that appears naturally on account of gauge anomaly-cancellation in the supergravity theory plays a crucial role in establishing a gaugeinvariant coupling of the KR field (or, torsion) with the electromagnetic field [7,17]. Certain physically observable phenomena, especially in the cosmological scenario, may result from the KR-electromagnetic coupling through the U (1) Chern-Simons term.…”

Section: Introductionmentioning

confidence: 99%

Observable signals in a string inspired axion-dilaton background and Randall-Sundrum scenario

2005

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Rotation angle of the plane of polarization of the distant galactic radio waves has been estimated in a string inspired axion-dilaton background. It is found that the axion,dual to the field strength of the second rank massless antisymmetric Kalb-Ramond field in the string spectrum, produces a wavelength independent optical rotation which is much larger than that produced by the dilaton. Detection of such rotation has been reported in some recent cosmological experiments. The observed value has been compared with our estimated theoretical value following various cosmological constraints. The effects of warped extra dimensions in a braneworld scenario on such an optical rotation have been investigated.

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Section: Introductionmentioning

confidence: 99%

Observable signals in a string inspired axion-dilaton background and Randall-Sundrum scenario

2005

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“…As yet, the Abelian axion has not been found experimentally [29,30,31,32,33,34], see also the discussion of Cooper and Stedman [35] on corresponding ring laser experiments.…”

Section: B No Axion?mentioning

confidence: 99%

Equivalence principle and electromagnetic field: no birefringence, no dilaton, and no axion

Hehl

Obukhov

2008

Gen Relativ Gravit

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The coupling of the electromagnetic field to gravity is discussed. In the premetric axiomatic approach based on the experimentally well established conservation laws of electric charge and magnetic flux, the Maxwell equations are the same irrespective of the presence or absence of gravity. In this sense, one can say that the charge "substratum" and the flux "substratum"are not influenced by the gravitational field directly. However, the interrelation between these fundamental substrata, formalized as the spacetime relation H = H(F ) between the 2-forms of the electromagnetic excitation H and the electromagnetic field strength F , is affected by gravity. Thus the validity of the equivalence principle for electromagnetism depends on the form of the spacetime relation. We discuss the nonlocal and local linear constitutive relations and demonstrate that the spacetime metric can be accompanied also by skewon, dilaton, and axion fields. All these premetric companions of the metric may eventually lead to a violation of the equivalence principle.

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“…The interactions of axion to other particles are determined by specific models [1,2]. Many other axionlike particles (ALPs) with very small mass are predicted, in the supergravity [3] and superstring [4] theory. These ALPs can have a coupling to photons similar to the axion and may alter the astrophysical observations.…”

Section: Introductionmentioning

confidence: 99%

Quasar polarization with ultralight (pseudo-)scalars

2015

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Recently, it was shown, that the absence of circular polarization of visible light from quasars, severely constrains the interpretation of axion like particles (ALPs) as a solution for the generation of the linear polarization. Furthermore, the new observation of the linear polarization in the radio wavelength from quasars, similar to the earlier observation performed in the optical band, makes the ALPs scenario inconsistent with at least one of the two observations. In this study we extend this scenario, to two axion like particles, one scalar and another pseudoscalar. We find, that the effects from scalar and pseudoscalar cancel out each other, thereby suppressing the circular polarization, while preserving consistent linear polarization, as observed in both visible and radio waves bands.

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Parity-violating gravitational coupling of electromagnetic fields

Abstract: Abstract

Cited by 86 publications

References 27 publications

Observable signals in a string inspired axion-dilaton background and Randall-Sundrum scenario

Observable signals in a string inspired axion-dilaton background and Randall-Sundrum scenario

Equivalence principle and electromagnetic field: no birefringence, no dilaton, and no axion

Quasar polarization with ultralight (pseudo-)scalars

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