Multi-Field versus Single-Field in the Supergravity Models of Inflation and Primordial Black Holes; Universe; Vol. 7, iss. 5

Multi-Field versus Single-Field in the Supergravity Models of Inflation and Primordial Black Holes; Universe; Vol. 7, iss. 5

Podrobná bibliografie
Parent link:	Universe Vol. 7, iss. 5.— 2021.— [115, 28 p.]
Hlavní autor:	Ketov S. V. Sergey Vladimirovich
Korporativní autor:	Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Shrnutí:	Title screen We review the models unifying inflation and Primordial Black Hole (PBH) formation, which are based on the modified (Starobinsky-type) supergravity. We begin with the basic (Starobinsky) inflationary model of modified gravity and its alpha-attractor-type generalizations for PBH production, and recall how all those single-field models can be embedded into the minimal supergravity. Then, we focus on the effective two-field models arising from the modified (Starobinsky-type) supergravity and compare them to the single-field models under review. Those two-field models describe double inflation whose first stage is driven by Starobinsky’s scalaron and whose second stage is driven by another scalar belonging to the supergravity multiplet. The power spectra are numerically computed, and it is found that the ultra-slow-roll regime gives rise to the enhancement (peak) in the scalar power spectrum leading to an efficient PBH formation. The resulting PBH masses and their density fraction (as part of dark matter) are found to be in agreement with cosmological observations. The PBH-induced gravitational waves, if any, are shown to be detectable by the ground-based and space-based gravitational interferometers under construction.
Jazyk:	angličtina
Vydáno:	2021
Témata:	труды учёных ТПУ электронный ресурс inflation primordial black holes supergravity dark matter инфляция черные дыры супергравитация темная материя
On-line přístup:	http://earchive.tpu.ru/handle/11683/69103 https://doi.org/10.3390/universe7050115
Médium:	Elektronický zdroj Kapitola
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664585

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