Study of primordial non-Gaussianity $f_{\mathrm{NG}}$ and $g_{\mathrm{NG}}$ with the cross-correlations between the scalar-induced gravitational waves and the cosmic microwave background

Autor:	Zhao, Zhi-Chao, Wang, Sai, Li, Jun-Peng, Kohri, Kazunori
Rok vydání:	2024
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology
Druh dokumentu:	Working Paper
Popis:	The stochastic gravitational-wave background originating from cosmic sources contains vital information about the early universe. In this work, we comprehensively study the cross-correlations between the energy-density anisotropies in scalar-induced gravitational waves (SIGWs) and the temperature anisotropies and polarization in the cosmic microwave background (CMB). In our analysis of the angular power spectra for these cross-correlations, we consider all contributions of the local-type primordial non-Gaussianity $f_{\mathrm{NL}}$ and $g_{\mathrm{NL}}$ that can lead to large anisotropies. We show that the angular power spectra are highly sensitive to primordial non-Gaussianity. Furthermore, we project the sensitivity of future gravitational-wave detectors to detect such signals and, consequently, measure the primordial non-Gaussianity. Comment: 11 pages, 5 figures, two columns
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2412.02500 Zobrazit plný text záznamu View this record from Arxiv