Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Yükselci, A. Emrah"'
A quantitative analysis of the effect of box size in N-body simulations of the matter power spectrum
We study the effect of box size on the matter power spectrum obtained via cosmological N-body simulations. Within the framework of the cosmic screening approach, we show that the relative deviation between the spectra for our largest comoving box wit
Externí odkaz:
http://arxiv.org/abs/2401.15214
Publikováno v:
Phys. Lett. B 851, 138564 (2024)
In the presence of the gravitational field, the energy density of matter no longer coincides with its mass density. A discrepancy exists, of course, also between the associated power spectra. Within the $\Lambda$CDM model, we derive a formula that re
Externí odkaz:
http://arxiv.org/abs/2309.02989
Autor:
Arapoğlu, A. Savaş, Yükselci, A. Emrah
We examine the anisotropy originated from a first-order vacuum phase transitions through three-dimensional numerical simulations. We apply Bianchi Type-I metric to our model that has one scalar field minimally coupled to the gravity. We calculate the
Externí odkaz:
http://arxiv.org/abs/2307.16458
Publikováno v:
JCAP 05 (2024) 083
One of the main objectives of modern cosmology is to explain the origin and evolution of cosmic structures at different scales. The principal force responsible for the formation of such structures is gravity. In a general relativistic framework, we h
Externí odkaz:
http://arxiv.org/abs/2307.06920
Publikováno v:
Phys. Rev. D 107, 063516 (2023)
We numerically examine the exterior solution of spherically symmetric and static configuration in scalar-tensor theories by using the nonminimally coupled scalar field with zero potential as our sample model. Our main purpose in this work is to fit t
Externí odkaz:
http://arxiv.org/abs/2211.06079
Autor:
Arapoğlu, A. Savaş, Yükselci, A. Emrah
Publikováno v:
Physics of the Dark Universe 40 (2023) 101176
We investigate first-order vacuum phase transitions in the presence of a non-minimally coupled scalar field starting with the coupling effect on the initial dynamics of phase transitions by defining an effective potential for the scalar field and the
Externí odkaz:
http://arxiv.org/abs/2210.16699
Autor:
Arapoğlu, A. Savaş, Yükselci, A. Emrah
Publikováno v:
In Physics of the Dark Universe July 2024 45
The viability of slow-roll approximation is examined by considering the structure of phase spaces in scalar-tensor theories of gravitation and the analysis is exemplified with a nonminimally coupled scalar field to the spacetime curvature. The slow-r
Externí odkaz:
http://arxiv.org/abs/2007.10850
Publikováno v:
Physics Letters B 809 (2020) 135761
We consider a universe filled with perfect fluid with the constant equation of state parameter $\omega$. In the theory of scalar perturbations, we study the effect of peculiar velocities on the gravitational potential. For radiation with $\omega=1/3$
Externí odkaz:
http://arxiv.org/abs/2005.06237
Autor:
Arapoğlu, A. Savaş, Yükselci, A. Emrah
Publikováno v:
Physics of the Dark Universe, Volume 28, May 2020, 100488
We study the structure of spherically symmetric and static objects in the presence of a nonminimally coupled scalar field having a potential of the form $V(\phi)=-\mu^2\phi^2/2+\lambda\phi^4/4$. We numerically solve equations of the system using two
Externí odkaz:
http://arxiv.org/abs/2002.03025