Yunes 2010 检验引力的parity violation

主要内容:
不同偏振的引力波的传播速度相同，但强度不同。这个可以用短暴给测出来，办法是短暴本身有红移就知道距离；引力波也可以探测距离。如果这二者不同的话，就说明parity violation了。文章还说现有仪器的精度已经足够做这个检测了。

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Title:		Testing gravitational parity violation with coincident gravitational waves and short gamma-ray bursts
Authors:		Yunes, Nicolas; O'Shaughnessy, Richard; Owen, Benjamin J.; Alexander, Stephon
Publication:		eprint arXiv:1005.3310
Publication Date:		05/2010
Origin:		ARXIV
Keywords:		General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology, High Energy Physics - Theory
Comment:		21 pages, 2 figures, submitted to Phys. Rev. D
Bibliographic Code:		2010arXiv1005.3310Y

Abstract

Gravitational parity violation is a possibility motivated by particle physics, string theory and loop quantum gravity. One effect of it is amplitude birefringence of gravitational waves, whereby left and right circularly-polarized waves propagate at the same speed but with different amplitude evolution. Here we propose a test of this effect through coincident observations of gravitational waves and short gamma-ray bursts from binary mergers involving neutron stars. Such gravitational waves are highly left or right circularly-polarized due to the geometry of the merger. Using localization information from the gamma-ray burst, ground-based gravitational wave detectors can measure the distance to the source with reasonable accuracy. An electromagnetic determination of the redshift from an afterglow or host galaxy yields an independent measure of this distance. Gravitational parity violation would manifest itself as a discrepancy between these two distance measurements. We exemplify such a test by considering one specific effective theory that leads to such gravitational parity-violation, Chern-Simons gravity. We show that the advanced LIGO-Virgo network and all-sky gamma-ray telescopes can be sensitive to the propagating sector of Chern-Simons gravitational parity violation to a level roughly two orders of magnitude better than current stationary constraints from the LAGEOS satellites.

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