Zobrazeno 1 - 10
of 457
pro vyhledávání: '"Gurzadyan, V."'
Publikováno v:
Eur. Phys. J. Plus, 139, 821 (2024)
The star cluster surrounding the supermassive black hole in the center of Milky Way is probed using the data on the S2 star. The value of precession found at the physics-informed neural networks (PINN) analysis of the S2 data is used to consider the
Externí odkaz:
http://arxiv.org/abs/2409.10567
Publikováno v:
Eur. Phys. J. Plus, 139, 317 (2024)
A mechanism for smearing of the primordial gravitational waves during the radiation-dominated phase of the evolution of the Universe is considered. It is shown that the primordial gravitational waves can possess hyperbolicity features due to their pr
Externí odkaz:
http://arxiv.org/abs/2404.07244
Publikováno v:
Eur. Phys. J. Plus 139, 246 (2024)
Physics-informed neural network (PINN) analysis of the dynamics of S-stars in the vicinity of the supermassive black hole in the Galactic center is performed within General Relativity treatment. The aim is to reveal the role of possible extended mass
Externí odkaz:
http://arxiv.org/abs/2403.09748
Publikováno v:
Eur. Phys. J. Plus, 138, 883 (2023)
We studied the dynamics of S-stars in the Galactic center using the physics-informed neural networks. The neural networks are considered for both, Keplerian and the General Relativity dynamics, the orbital parameters for stars S1, S2, S9, S13, S31, a
Externí odkaz:
http://arxiv.org/abs/2310.06865
Publikováno v:
A&A, 677, A161 (2023)
We study structure formation in the late Universe within the Vlasov kinetic self-consistent field approach. Our work is principally focused on the use of the modified gravitational potential with a repulsive term of the cosmological constant, which i
Externí odkaz:
http://arxiv.org/abs/2309.11734
Publikováno v:
A&A, 672, A95 (2023)
We consider a principal problem, that of the possible dominating role of self-consistent gravitational interaction in the formation of cosmic structures: voids and their walls in the local Universe. It is in the context of the Hubble tension as a pos
Externí odkaz:
http://arxiv.org/abs/2303.03194
Publikováno v:
Eur. Phys. J. Plus 137, 1133 (2022)
We show that gravitational waves can act as waveguides for electromagnetic radiation, that is if the latter is initially aligned with the gravitational waves, then the alignment will survive during the propagation. The analysis is performed using the
Externí odkaz:
http://arxiv.org/abs/2210.09544
Publikováno v:
Eur. Phys. J. Plus, 137: 965 (2022)
The tidal disruption of stars in the vicinity of massive black holes is discussed in the context of $\Lambda$-gravity. The latter provides an explanation to the Hubble tension as a possible consequence of two Hubble flows, the local and global ones.
Externí odkaz:
http://arxiv.org/abs/2209.03751
Publikováno v:
A&A 666, A149 (2022)
The kinetic approach to the formation of the filaments in the large-scale matter distribution in the Universe is considered within the Vlasov formalism. The structures arise due to the self-consistent dynamics, along with the repulsive term in the mo
Externí odkaz:
http://arxiv.org/abs/2209.00184
Publikováno v:
Eur. Phys. J. Plus 137, 458 (2022)
The property of adiabatic invariance is studied for the generalized potential satisfying the condition of identity of sphere's and point mass's gravity. That function contains a second term corresponding to the cosmological constant as weak-field Gen
Externí odkaz:
http://arxiv.org/abs/2204.06048