Vector dark radiation and gravitational-wave polarization - INSPIRE

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Vector dark radiation and gravitational-wave polarization

Alfredo D. Miravet
(
- Madrid U.
)
,
Antonio L. Maroto
(
- Madrid U.
)

Mar 14, 2022

15 pages

Published in:

JCAP 09 (2022) 014

Published: Sep 6, 2022

e-Print:

2203.07125 [gr-qc]

DOI:

10.1088/1475-7516/2022/09/014

View in:

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Abstract: (IOP)

We consider conformal vector models which could play the role of a cosmological dark radiation component. We analyse the propagation of gravitational waves in the presence of this vector background and find a suppression in the tensor transfer function at large scales. We also find that although the cosmological background metric is isotropic, anisotropies are imprinted in the tensor power spectrum. In addition, the presence of the background vector fields induces a net polarization of the gravitational wave background and, for certain configurations of the vector field, a linear to circular polarization conversion. We also show that this kind of effects are also present for vector models with more general potential terms.

Note:

15 pages, 8 figures. Matches version published in JCAP

cosmology of theories beyond the SM
gravitational waves / theory
Gravitational waves in GR and beyond : theory
model: vector
background: vector
gravitational radiation: polarization
background: metric
gravitational radiation: background
power spectrum: tensor
gravitational radiation: propagation

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