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Chiral gravitational waves from chiral fermions

Anber, Mohamed M. and Sabancilar, Eray (2017) 'Chiral gravitational waves from chiral fermions.', Physical review D., 96 (2). 023501.


We report on a new mechanism that leads to the generation of primordial chiral gravitational waves, and hence, the violation of the parity symmetry in the Universe. We show that nonperturbative production of fermions with a definite helicity is accompanied by the generation of chiral gravitational waves. This is a generic and model-independent phenomenon that can occur during inflation, reheating and radiation eras, and can leave imprints in the cosmic microwave background polarization and may be observed in future ground- and space-based interferometers. We also discuss a specific model where chiral gravitational waves are generated via the production of light chiral fermions during pseudoscalar inflation.

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Publisher statement:Reprinted with permission from the American Physical Society: Anber, Mohamed M. & Sabancilar, Eray (2017). Chiral gravitational waves from chiral fermions. Physical Review D 96(2): 023501. © (2017) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:No date available
Date deposited:05 October 2021
Date of first online publication:05 July 2017
Date first made open access:05 October 2021

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