Parity violating non-Gaussianity from axion-gauge field dynamics

0554707 - FZÚ 2022 RIV US eng J - Článek v odborném periodiku
Özsoy, Ogan
Parity violating non-Gaussianity from axion-gauge field dynamics.
Physical Review D. Roč. 104, č. 12 (2021), č. článku 123523. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT EF15_003/0000437
Grant ostatní: OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institucionální podpora: RVO:68378271
Klíčová slova: fluctuation: tensor * fluctuation: scalar * gravitation: coupling
Obor OECD: Particles and field physics
Impakt faktor: 5.407, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1103/PhysRevD.104.123523

We study scalar-tensor-tensor and tensor-scalar-scalar three-point cross-correlations generated by the dynamics of a transiently rolling spectator axion-U(1) gauge field model during inflation. In this framework, tensor and scalar fluctuations are sourced by gauge fields at the nonlinear level due to gravitational interactions, providing a chiral background of gravitational waves while keeping the level of scalar fluctuations at the observationally viable levels at cosmic microwave background (CMB) scales. We show that the gravitational couplings between the observable sector and gauge fields can also mediate strong correlations between scalar and tensor fluctuations, generating an amplitude for the mixed-type three-point functions that is parametrically larger-f(NL) similar or equal to O(110)(r/0.00)(3/2)-compared to the single-field realizations of inflation.
Trvalý link: http://hdl.handle.net/11104/0329370