24 citations · 46 across the 6 of their papers we have counts for
6 papers
Stability Analysis of the Cosmological Dynamics of -complete Stringy Gravity
A. Savaş Arapoğlu, Sermet Çağan, Aybike Çatal-Özer
The massless fields in the universal NS-NS sector of string theory form multiplets of Double Field Theory, which is a theory that provides a T-duality covariant formulati…
Cosmological First-Order Vacuum Phase Transitions in an Expanding Anisotropic Universe
A. Savaş Arapoğlu, A. Emrah Yükselci
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 h…
Scalar and vector perturbations in a universe with nonlinear perfect fluid
Ezgi Canay, Ruslan Brilenkov, Maxim Eingorn +2
We study a three-component universe filled with dust-like matter in the form of discrete inhomogeneities (e.g., galaxies) and perfect fluids characterized by linear and nonlinear e…
Formalizing Slow-roll Inflation in Scalar-Tensor Theories of Gravitation
Kemal Akın, A. Savaş Arapoğlu, A. Emrah Yükselci
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 no…
Neutron Star Structure in the Presence of Nonminimally Coupled Scalar Fields
A. Savaş Arapoğlu, K. Yavuz Ekşi, A. Emrah Yükselci
We study the structure of neutron stars in scalar-tensor theories for the nonminimal coupling of the form . We solve the hydrostatic equilibrium equations for tw…
Generalized Slow-roll Inflation in Non-minimally Coupled Theories
A. Savas Arapoglu
The slow-roll field equations for the case of non-minimally coupled scalar fields are obtained in two ways: first using the direct generalization of slow-roll conditions in the min…