Zobrazeno 1 - 10
of 105
pro vyhledávání: '"Astashenok, Artyom V."'
We investigated Tsallis holographic dark energy (THDE) model in light of modern observations of supernovae, Hubble parameter measurements, data for baryon acoustic oscillations and fluctuations of matter density. The dark energy density for THDE mode
Externí odkaz:
http://arxiv.org/abs/2410.00597
Publikováno v:
Phys. Lett. B 855, 138767, 2024
We investigated evolution of metric and density perturbations for Tsallis model of holographic dark energy with energy density $\sim L^{2\gamma - 4}$, where $L$ is length of event horizon or inverse Hubble parameter and $\gamma$ is parameter of non-a
Externí odkaz:
http://arxiv.org/abs/2406.10383
We investigate realistic models of compact objects, focusing on neutron and strange stars, composed by dense matter and dark energy in the form of a simple fluid or scalar field interacting with matter. For the dark energy component, we use equations
Externí odkaz:
http://arxiv.org/abs/2307.14862
We investigate the Chandrasekhar mass limit for white dwarfs in various models of $f(R)$ gravity. Two equations of state for stellar matter are used: simple relativistic polytropic equation with polytropic index $n=3$ and the realistic Chandrasekhar
Externí odkaz:
http://arxiv.org/abs/2211.14892
We examine the Chandrasekhar limit for white dwarfs in $f(R)$ gravity, with a simple polytropic equation of state describing stellar matter. We use the most popular $f(R)$ gravity model, namely the $f(R)=R+\alpha R^2$ gravity, and calculate the param
Externí odkaz:
http://arxiv.org/abs/2209.13693
We considered the Tsallis holographic dark energy model in frames of Nojiri-Odintsov gravity with $f(R)=R+\lambda R^2-\sigma{\mu}/{R}$. For IR cutoff event horizon is taken. The cosmological evolution of such universe is investigated for various init
Externí odkaz:
http://arxiv.org/abs/2208.13320
Publikováno v:
Universe, 8, 265 (2022)
We consider a Tsallis holographic dark energy model with interaction between dark energy and matter. The density of dark energy is taken as $\rho_d \sim 3C^2/L^{4-2\gamma}$, where $C$, $\gamma$ are constants. The event horizon is chosen as the charac
Externí odkaz:
http://arxiv.org/abs/2204.14162
We investigate various dark energy models by taking into account the thermal effects induced from Hawking radiation on the apparent horizon of the Universe, for example near a finite-time future singularity. If the dark energy density increases as th
Externí odkaz:
http://arxiv.org/abs/2101.06657
Very recently a compact object with a mass in the range $2.50\div 2.67\, M_{\odot}$ has been discovered via gravitational waves detection of a compact binary coalescence. The mass of this object makes it among the heaviest neutron star never detected
Externí odkaz:
http://arxiv.org/abs/2008.10884
We investigate equilibrium configurations of uniformly rotating neutron stars in $R^2$ gravity with axion scalar field for GM1 equation of state (EoS) for nuclear matter. The mass-radius diagram, mass-central energy density are presented for some fre
Externí odkaz:
http://arxiv.org/abs/2008.11271