104 citations · 247 across the 12 of their papers we have counts for
9 papers · 1 filter
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…
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…
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…
Hawking radiation as the cosmic censor
Koray Düztaş, İbrahim Semiz
Hawking radiation acts as a cosmic censor since it carries away the angular momentum of the black hole, proportionally more than its mass. In this work we first show that an extrem…
The decoupling problem of the Proca equation; and treatment of Dirac, Maxwell and Proca fields on the resulting pp-wave spacetimes
Koray Düztaş, İbrahim Semiz
In this work we take a formal approach to the problem of decoupling Proca equations in curved space-times. We use Newman-Penrose (NP) two-spinor formalism to represent the Proca ve…
What do the cosmological supernova data really tell us?
İbrahim Semiz, A. Kazım Çamlıbel
Not much by themselves, aparently. We try to reconstruct the scale factor of the universe from the SNe Ia data, i.e. the luminosity distance , using only the cosmo…