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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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89 papers · 1 filter
The generalized second law for Kerr-Taub-NUT black holes perturbed by test field
Koray Düztaş, Ahmet Cem Erdoğan
We evaluate the variations in the area and the entropy of Kerr-Taub-NUT black holes perturbed by bosonic and fermionic test fields. We demonstrate that the critical frequency for a…
Antipodal constraints on transient Hawking radiation in a conformal channel
M. Baran Ökten, Aslı S. Turan
Hawking radiation away from stationarity is governed, at the ray tracing level, by the retarded time evolution of the null mapping. We consider an extracted massless conformal chan…
Analysis of Pantheon+ supernova data suggests evidence of sign-changing pressure of the cosmological fluid
A. Kazım Çamlıbel, M. Akif Feyizoğlu, İbrahim Semiz
In this work, we revisit/reinterpret/extend the model-independent analysis method (which we now call spread - luminosity distance fitting, spread-LDF) from our previous work. We ap…
Displacement Memory Effect from Supersymmetry
Erdal Catak, Mahmut Elbistan, Mustafa Mullahasanoglu
We explain the recent results on the displacement memory effect (DME) of plane gravitational waves using supersymmetric quantum mechanics. This novel approach stems from that both…
The Exterior Calculus of Quadratic Gravity
Metin Arık, Ahmet Baykal, Tekin Dereli +1
The metric tensor field equations for the general quadratic curvature gravity in four spacetime dimensions are derived by making use of the algebra of the exterior forms defined on…
Dynamical de Sitter black holes in a quasi-stationary expansion
Aaron Beyen, Efe Hamamcı, Kasper Meerts +1
We revisit and improve the analytic study arXiv:1804.03462 of spherically symmetric but dynamical black holes in Einstein's gravity coupled to a real scalar field. We introduce a s…
How to Detect an Astrophysical Nanohertz Gravitational-Wave Background
Bence Bécsy, Neil J. Cornish, Patrick M. Meyers +93
Analysis of pulsar timing data have provided evidence for a stochastic gravitational wave background in the nHz frequency band. The most plausible source of such a background is th…
Memory Effect and Carroll Symmetry: 50 years later
M. Elbistan, P. -M. Zhang, P. A. Horvathy
Particles at rest before the arrival of a burst of gravitational wave move, after the wave has passed, with constant velocity along diverging geodesics. As recognized by Souriau 50…
Subtleties in constraining gravity theories with mass-radius data
Ekrem S. Demirboğa, Yakup Emre Şahin, Fethi M. Ramazanoğlu
Simultaneous measurements of neutron star masses and radii can be used to constrain deviations from general relativity (GR) as was recently demonstrated for the spontaneous scalari…
Cosmological models in scale-independent energy-momentum squared gravity
Ozgur Akarsu, N. Merve Uzun
Scale-independent EMSG is a particular model of energy-momentum squared gravity (EMSG) in which the new terms in the Einstein field equations arising from the EMSG theory enter wit…
A 3+1 formulation of the 1/c expansion of General Relativity
Mahmut Elbistan, Efe Hamamci, Dieter Van den Bleeken +1
Expanding General Relativity in the inverse speed of light, 1/c, leads to a nonrelativistic gravitational theory that extends the Post-Newtonian expansion by the inclusion of addit…
Weak field and slow motion limits in energy-momentum powered gravity
Ozgur Akarsu, A. Kazim Camlibel, Nihan Katirci +2
We explore the weak field and slow motion limits, Newtonian and Post-Newtonian limits, of the energy-momentum powered gravity (EMPG), viz., the energy-momentum squared gravity (EMS…
Analytic Solutions of Brans-Dicke Cosmology: Early Inflation and Late Time Accelerated Expansion
Medine Ildes, Metin Arik
We investigate the most general exact solutions of Brans-Dicke cosmology by choosing the scale factor "a" as the new independent variable. It is shown that a set of three field equ…
Analytic Solutions of Scalar Field Cosmology, Mathematical Structures for Early Inflation and Late Time Accelerated Expansion
Medine Ildes, Metin Arik
We study the most general cosmological model with real scalar field which is minimally coupled to gravity. Our calculations are based on Friedmann-Lemaitre-Robertson-Walker (FLRW)…
Circularly polarized periodic gravitational wave and the Pais-Uhlenbeck oscillator
Mahmut Elbistan
The "Bargmann framework" allows us to prove the equivalence of the Pais-Uhlenbeck oscillator with a spin-zero particle in a circularly polarized periodic gravitational wave. Pushin…
GRChombo: An adaptable numerical relativity code for fundamental physics
Tomas Andrade, Llibert Areste Salo, Josu C. Aurrekoetxea +29
GRChombo is an open-source code for performing Numerical Relativity time evolutions, built on top of the publicly available Chombo software for the solution of PDEs. Whilst GRChomb…
Perturbative solution of the Einstein Constraints with Spin and Momentum Far Away From a Binary Source in the Bowen-York formalism
Emel Altas, Emine Ertugrul, Bayram Tekin
We study the momentum and Hamiltonian constraints of vacuum Einstein equations, within the Bowen-York formalism, for two interacting black holes in close separation, with anti-para…
Particle motion in circularly polarized vacuum pp waves
P-M. Zhang, M. Elbistan, P. A. Horvathy
Bialynicki-Birula and Charzynski argued that a gravitational wave emitted during the merger of a black hole binary may be approximated by a circularly polarized wave which may in t…
Estimation of attenuation of gravitational waves by Bose-Einstein condensate dark matter halos using Bogoliubov-de Gennes theory
Levent Akant, İ. Çağrı İşeri, İbrahim Semiz
We consider a gravitational plane wave passing through a galactic dark matter halo composed of weakly self-interacting, self-gravitating, Bose-Einstein condensate of ultralight par…
The Higgs Field and the Jordan Brans Dicke Cosmology
Onder Dunya, Levent Akant, Metin Arik +3
We investigate a field theoretical approach to the Jordan-Brans- Dicke (JBD) theory extended with a particular potential term on a cosmological background by starting with the moti…
Oscillon collapse to black holes
Zainab Nazari, Michele Cicoli, Katy Clough +1
Using numerical relativity simulations we study the dynamics of pseudo-topological objects called oscillons for a class of models inspired by axion-monodromy. Starting from free fi…
A New Approach to Flatness, Horizon and Late-time Accelerating Expansion Problems on the basis of Mach Principle
Onder Dunya, Metin Arik
Based on the idea that the components of a cosmological metric may be determined by the total gravitational potential of the universe, the scalar field in the Jordan-Brans-…
Lukash plane waves, revisited
M. Elbistan, P. M. Zhang, G. W. Gibbons +1
The Lukash metric is a homogeneous gravitational wave which at late times approximates the behaviour of a generic class of spatially homogenous cosmological models with monotonical…
The general static spherical perfect fluid solution with EoS parameter w=-1/5
İbrahim Semiz
The general analytical solution for the static spherically symmetric metric supported by a perfect fluid with isothermal (proportional) equation-of-state is not known at…