Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Olga Razina"'
Publikováno v:
Symmetry, Vol 16, Iss 7, p 842 (2024)
This article examines quantum group symmetry using the Potts model. The transformation of the Potts model into a polynomial knot state on Kaufman square brackets is analyzed. It is shown how a dichromatic polynomial for a planar graph can be obtained
Externí odkaz:
https://doaj.org/article/8647783c083e41daa5cafcfb340b8014
Publikováno v:
Symmetry, Vol 15, Iss 10, p 1897 (2023)
In this work, we studied the phase space of f(R) gravity in the presence of a misalignment axion, including parity violating Chern–Simons terms. We construct the autonomous dynamical system by using appropriate dimensionless variables and find the
Externí odkaz:
https://doaj.org/article/b3839b63211b4dc5be3af087dbd44040
Publikováno v:
Universe, Vol 8, Iss 9, p 484 (2022)
In this short review, we discuss how Earth’s climatological and geological history and also how the shadows of galactic black holes might reveal our Universe’s past evolution. Specifically we point out that a pressure singularity that occurred in
Externí odkaz:
https://doaj.org/article/9649679360364005b79d35adeb73f316
Autor:
Pyotr Tsyba, Olga Razina
Publikováno v:
Eurasian Physical Technical Journal. 18:93-100
This work dedicated to the investigation cosmological models based on tachyon field. It was showed that Einstein’s field equations for spatially flat, homogeneous and isotropic Friedman-Robertson-Walker space-time have form-invariance of symmetry,
Publikováno v:
Physics of the Dark Universe. 40:101186
Publikováno v:
International Journal of Modern Physics D. 30
In this work, we investigate a cosmological model with the tachyon and fermion fields with barotropic equation of state, where pressure [Formula: see text], energy density [Formula: see text] and barotropic index [Formula: see text] are related by th
Publikováno v:
Bulletin of the Karaganda University. "Physics" Series. 93:94-102
In this paper, we study the model of the late universe with the homogeneous, isotropic and flat Friedmann–Robertson–Walker metric, where the source of the gravitational field is based on the fermion and boson fields, with the Maxwell term [Formul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca591e54ea60692d71c0cf482ea3ff16
http://arxiv.org/abs/2007.05037
http://arxiv.org/abs/2007.05037
Publikováno v:
Journal of Physics: Conference Series. 1730:012136
We investigated f(R) gravity with k-essence using the Starobinsky model as an example, given by the expression f(R) = R + α R 2. Using the hybrid function of the scale factor, we found the scalar field function and its potential. For the model under
Publikováno v:
Journal of Physics: Conference Series. 1391:012162
In this article, we examined the Starobinsky gravity model in homogeneous and isotropic space-time described by the Friedman-Robertson-Walker metric. In the framework of this model, cosmological parameters were described that explain it in the early