Zobrazeno 1 - 10
of 144
pro vyhledávání: '"Babichev, E. A."'
Employing the publicly available CosmoLattice code, we conduct numerical simulations of a domain wall network and the resulting gravitational waves (GWs) in a radiation-dominated Universe in the $Z_2$-symmetric scalar field model. In particular, the
Externí odkaz:
http://arxiv.org/abs/2406.17053
Publikováno v:
Phys. Rev. D 108, 123529 (2023)
We discuss cosmic domain walls described by a tension red-shifting with the expansion of the Universe. These melting domain walls emit gravitational waves with the low-frequency spectral shape $\Omega_{gw}\propto f^{2}$ corresponding to the spectral
Externí odkaz:
http://arxiv.org/abs/2307.04582
Publikováno v:
JCAP04(2022)028
Cosmic domain walls are harmless, provided that their tension decreases with expansion of the Universe. This setup can be realized, if the scale of spontaneous symmetry breaking is induced dynamically through the interaction with hot primordial plasm
Externí odkaz:
http://arxiv.org/abs/2112.12608
Publikováno v:
Phys. Rev. D 105, 063530 (2022)
We propose a novel scenario of Dark Matter production naturally connected with generation of gravitational waves. Dark Matter is modelled as a real scalar, which interacts with the hot primordial plasma through a portal coupling to another scalar fie
Externí odkaz:
http://arxiv.org/abs/2104.13722
Publikováno v:
JCAP09(2020)059
We discuss the gravitational creation of superheavy particles $\chi$ in an inflationary scenario with a quartic potential and a non-minimal coupling between the inflaton $\varphi$ and the Ricci curvature: $\xi \varphi^2 R/2$. We show that for large c
Externí odkaz:
http://arxiv.org/abs/2006.02225
Publikováno v:
J. Exp. Theor. Phys. 128, 599 (2019)
A change in gravity law in some regimes is predicted in the modified gravity models that are actively discussed at present. In this paper, we consider a possibility that the signal recorded by the Geograv resonant gravitational-wave detector in 1987
Externí odkaz:
http://arxiv.org/abs/1906.06088
Publikováno v:
A&A 600, A40 (2017)
The Galileon theory belongs to the class of modified gravity models that can explain the late-time accelerated expansion of the Universe. In previous works, cosmological constraints on the Galileon model were derived, both in the uncoupled case and w
Externí odkaz:
http://arxiv.org/abs/1605.02627
We show that the two additional Lagrangians that appear in theories beyond Horndeski can be reexpressed in terms of simple generalizations of the "John" and "Paul" terms of the Fab Four theories. We find that these extended Fab Four satisfy the same
Externí odkaz:
http://arxiv.org/abs/1507.05942
Publikováno v:
Phys.-Usp. 56 (2013) 1155-1175; Uspekhi Fiz. Nauk 183 (2013) 1257-1280
The new, rapidly developing field of theoretical research --- studies of dark energy interacting with black holes (and, in particular, accreting onto black holes) --- is reviewed. The term `dark energy' is meant to cover a wide range of field theory
Externí odkaz:
http://arxiv.org/abs/1406.0841
Autor:
Neveu, J., Ruhlmann-Kleider, V., Astier, P., Besançon, M., Conley, A., Guy, J., Möller, A., Palanque-Delabrouille, N., Babichev, E.
Publikováno v:
A&A 569, A90 (2014)
The Galileon model is a modified gravity model that can explain the late-time accelerated expansion of the Universe. In a previous work, we derived experimental constraints on the Galileon model with no explicit coupling to matter and showed that thi
Externí odkaz:
http://arxiv.org/abs/1403.0854