Searching for Fossil Fields in the Gravity Sector

Autor:	Dimastrogiovanni, Emanuela, Fasiello, Matteo, Tasinato, Gianmassimo
Rok vydání:	2019
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory
Zdroj:	Phys. Rev. Lett. 124, 061302 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.124.061302
Popis:	Evidence for the presence of extra fields during inflation may be found in the anisotropies of the scalar and tensor spectra across a vast range of scales. Indeed, beyond the single-field slow-roll paradigm, a long tensor mode can modulate the power spectrum inducing a sizable quadrupolar anisotropy. We investigate how this dynamics plays out for the tensor two-point correlator. The resulting quadrupole stores information on squeezed tensor non-Gaussianities, specifically those sourced by the extra field content and responsible for the breaking of so-called consistency relations. We underscore the potential of anisotropies as a probe of new physics: testable at CMB scales through the detection of B-modes, they are accessible at smaller scales via interferometers and pulsar timing arrays. Comment: 7 pages, 2 figure
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1906.07204 Zobrazit plný text záznamu View this record from Arxiv