Chiral plasma instability and primordial gravitational waves

Anand, Sampurn (Aff1, 0000 0000 8527 8247, Theoretical Physics Division, Physical Research Laboratory, 380009, Ahmedabad, India) (Aff2, St. Stephen’s College, University Enclave, 110007, New Delhi, India) ; Bhatt, Jitesh R. (Aff1, 0000 0000 8527 8247, Theoretical Physics Division, Physical Research Laboratory, 380009, Ahmedabad, India) ; Pandey, Arun Kumar (Aff1, 0000 0000 8527 8247, Theoretical Physics Division, Physical Research Laboratory, 380009, Ahmedabad, India)

06 February 2019

Abstract: It is known that cosmic magnetic field, if present, can generate anisotropic stress in the plasma and hence, can act as a source of gravitational waves. These cosmic magnetic fields can be generated at very high temperature, much above electroweak scale, due to the gravitational anomaly in presence of the chiral asymmetry. The chiral asymmetry leads to instability in the plasma which ultimately leads to the generation of magnetic fields. In this article, we discuss the generation of gravitational waves, during the period of instability, in the chiral plasma sourced by the magnetic field created due to the gravitational anomaly. We have shown that such gravitational wave will have a unique spectrum. Moreover, depending on the temperature of the universe at the time of its generation, such gravitational waves can have wide range of frequencies. We also estimate the amplitude and frequency of the gravitational waves and delineate the possibility of its detection by the future experiments like eLISA.


Published in: EPJC 79 (2019) 119
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-019-6619-5
License: CC-BY-3.0



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