Zobrazeno 1 - 10
of 397
pro vyhledávání: '"Ketov, Sergei V."'
Autor:
Toyama, Shunsuke, Ketov, Sergei V.
The Starobinsky model of cosmological inflation in four spacetime dimensions is reviewed with the emphasis on impact of quantum gravity corrections. As a specific example of the quantum corrections, the Grisaru-Zanon quartic curvature terms in the gr
Externí odkaz:
http://arxiv.org/abs/2407.21349
Autor:
Ketov, Sergei V.
This paper is devoted to memory of late Professor V. G. Bagrov, who was my first teacher in theoretical physics. About 45 years later, theoretical physics has changed and me too. The subject of this paper relates some old ideas in cosmology with some
Externí odkaz:
http://arxiv.org/abs/2406.06923
Publikováno v:
Physics Letters B 855 (2024) 138811
The leading $(\alpha')^3$-correction to the gravitational low-energy effective action of closed (type II) superstring theory in four-spacetime dimensions defines the Einstein-Grisaru-Zanon gravity action that is applied for a calculation of the leadi
Externí odkaz:
http://arxiv.org/abs/2405.03925
Autor:
Frolovsky, Daniel, Ketov, Sergei V.
Publikováno v:
Int. J. Mod. Phys. D 33 (2024) 2340008
Dilaton and axion are ubiquitous in extended supergravities and closed superstrings. We propose new models of modular inflation in four-dimensional $N=1$ supergravity coupled to the chiral dilaton-axion-goldstino supermultiplet, which fit some necess
Externí odkaz:
http://arxiv.org/abs/2403.02125
Autor:
Saburov, Sultan, Ketov, Sergei V.
Publikováno v:
Universe 2024, 10, 354
A modified gravity model of Starobinsky inflation and primordial black hole production was proposed in good (within $1\sigma$) agreement with current measurements of the cosmic microwave background radiation. The model is an extension of the singular
Externí odkaz:
http://arxiv.org/abs/2402.02934
Autor:
Ishikawa, Ryotaro, Ketov, Sergei V.
Publikováno v:
Classical and Quantum Gravity 41 (2024) 195014
A viable model of large-field (chaotic) inflation with efficient production of primordial black holes is proposed in Starobinsky-like (modified) supergravity leading to the "no-scale-type" K\"ahler potential and the Wess-Zumino-type ("renormalizable"
Externí odkaz:
http://arxiv.org/abs/2401.11651
Autor:
Saburov, Sultan, Ketov, Sergei V.
Publikováno v:
Universe 2023, 9, 323
A new (improved) model of inflation and primordial black hole (PBH) formation is proposed by combining Starobinsky model of inflation, Appleby-Battye-Starobinsky (ABS) model of dark energy and a quantum correction in the modified $F(R)$ gravity. The
Externí odkaz:
http://arxiv.org/abs/2306.06597
Autor:
Frolovsky, Daniel, Ketov, Sergei V.
Publikováno v:
Universe 2023, 9(6), 294
The E-type $\alpha$-attractor models of single-field inflation were generalized further in order to accommodate production of primordial black holes (PBH) via adding a near-inflection point to the inflaton scalar potential at smaller scales, in good
Externí odkaz:
http://arxiv.org/abs/2304.12558
Fitting power spectrum of scalar perturbations for primordial black hole production during inflation
Autor:
Frolovsky, Daniel, Ketov, Sergei V.
Publikováno v:
Astronomy 2023, 2, 47-57
We propose a simple analytic fit for the power spectrum of scalar (curvature) perturbations during inflation, in order to describe slow roll of inflaton and formation of primordial black holes in the early universe, in the framework of single-field m
Externí odkaz:
http://arxiv.org/abs/2302.06153
Autor:
Aldabergenov, Yermek, Ketov, Sergei V.
Publikováno v:
Fortschr. Phys. 2023, 2300039
We study the formation of primordial black holes (PBH) in the Starobinsky supergravity coupled to the nilpotent superfield describing Volkov-Akulov goldstino. By using the no-scale K\"ahler potential and a polynomial superpotential, we find that unde
Externí odkaz:
http://arxiv.org/abs/2301.12750