TY - JOUR
T1 - Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
AU - Ben-Dayan, Ido
AU - Calcagni, Gianluca
AU - Gasperini, Maurizio
AU - Mazumdar, Anupam
AU - Pavone, Eliseo
AU - Thattarampilly, Udaykrishna
AU - Verma, Amresh
N1 - Publisher Copyright: © 2024 The Author(s)
PY - 2024/9/1
Y1 - 2024/9/1
N2 - We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the primordial tensor spectrum is blue: ekpyrotic universe with fast-rolling Galileons, string-gas cosmology with Atick-Witten conjecture and pre-big-bang cosmology. We find that the ekpyrotic scenario with Galileons does not produce a GWB amplitude detectable by present or third-generation interferometers, while the Atick-Witten-based string-gas model is ruled out in its present form for violating the big-bang-nucleosynthesis bound, contrary to the original string-gas scenario. In contrast, the GWB of the pre-big-bang scenario falls within the sensitivity window of both LISA and Einstein Telescope, where it takes the form of a single or a broken power law depending on the choice of parameters. The latter will be tightly constrained by both detectors.
AB - We study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the primordial tensor spectrum is blue: ekpyrotic universe with fast-rolling Galileons, string-gas cosmology with Atick-Witten conjecture and pre-big-bang cosmology. We find that the ekpyrotic scenario with Galileons does not produce a GWB amplitude detectable by present or third-generation interferometers, while the Atick-Witten-based string-gas model is ruled out in its present form for violating the big-bang-nucleosynthesis bound, contrary to the original string-gas scenario. In contrast, the GWB of the pre-big-bang scenario falls within the sensitivity window of both LISA and Einstein Telescope, where it takes the form of a single or a broken power law depending on the choice of parameters. The latter will be tightly constrained by both detectors.
KW - Gravitational waves in GR and beyond: theory
KW - primordial gravitational waves (theory)
KW - quantum gravity phenomenology
KW - string theory and cosmology
UR - http://www.scopus.com/inward/record.url?scp=85205928415&partnerID=8YFLogxK
U2 - https://doi.org/10.1088/1475-7516/2024/09/058
DO - https://doi.org/10.1088/1475-7516/2024/09/058
M3 - مقالة
SN - 1475-7516
VL - 2024
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 9
M1 - 058
ER -