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Correlation between opposite-helicity gravitons: Imprints on gravity-wave and microwave backgrounds

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Title: Correlation between opposite-helicity gravitons: Imprints on gravity-wave and microwave backgrounds
Authors: Gubitosi, G
Magueijo, JC
Item Type: Journal Article
Abstract: We examine some of the roots of parity violation for gravitons and uncover a closely related new effect: correlations between right and left handed gravitons. Such correlators have spin 4 if they involve gravitons moving along the same direction, and spin zero for gravitons moving with opposite directions. In the first case, the most immediate implication would be a degree of linear polarization for the tensor vacuum fluctuations, which could be seen by gravity wave detectors sensitive enough to probe the primordial background, its degree of polarization and anisotropies. Looking at the anisotropy of the gravity waves linear polarization we identify the parity respecting and violating components of the effect. The imprint on the CMB temperature and polarization would be more elusive, since it averages to zero in the two-point functions, appearing only in their cosmic variance or in fourth order correlators. In contrast, spin zero correlations would have an effect on the two point function of the CMB temperature and polarization, enhancing the $BB$ component if they were anti-correlations. Such correlations represent an amplitude for the production of standing waves, as first envisaged by Grishchuk, and could also leave an interesting signature for gravity wave detectors.
Issue Date: 30-Jan-2017
Date of Acceptance: 10-Jan-2017
URI: http://hdl.handle.net/10044/1/44094
DOI: https://dx.doi.org/10.1103/PhysRevD.95.023520
ISSN: 1550-7998
Publisher: American Physical Society
Journal / Book Title: Physical Review D: Particles, Fields, Gravitation and Cosmology
Volume: 95
Copyright Statement: © 2017 American Physical Society
Sponsor/Funder: John Templeton Foundation
Funder's Grant Number: ID#47633
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
POLARIZATION
FLUCTUATIONS
gr-qc
astro-ph.CO
Nuclear & Particles Physics
0201 Astronomical And Space Sciences
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
0206 Quantum Physics
Publication Status: Published
Open Access location: http://arxiv.org/pdf/arXiv:1610.05702
Article Number: 023520
Appears in Collections:Physics
Theoretical Physics
Faculty of Natural Sciences



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