output
20192026
most citedPantheon update on a model-independent analysis of cosmological supernova data

36 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions
Showing gr-qcShow all

6 papers · 1 filter

gr-qc2026

Potentially healthy time evolution in interacting -form fields

Fethi M. Ramazanoğlu, Kıvanç İ. Ünlütürk

It was recently discovered that many self-interacting vector fields can have healthy time evolution when field amplitudes are small, however, further dynamics becomes impossible if…

gr-qc2026

Underlying mechanisms of phase transitions in scalar-tensor theories

Murat Özinan, Kıvanç İ. Ünlütürk, Fethi M. Ramazanoğlu

Spontaneous scalarization phenomenon in scalar-tensor gravity is known to be a form of phase transition, and it was recently shown that the order of this transition changes dependi…

gr-qc2025★ 2 cited

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…

gr-qc2025★ 7 cited

Nature of phase transitions and metastability in scalar-tensor theories

Kıvanç İ. Ünlütürk, Semih Tuna, Oğuzhan K. Yamak +1

Compact stars above a critical stellar mass develop large scalar fields in some scalar-tensor theories. This scenario, called spontaneous scalarization, has been an intense topic o…

gr-qc2022★ 10 cited

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…

gr-qc2019

Cosmic acceleration driven by dark matter self-interactions: a phenomenological treatment

A. Kazım Çamlıbel

We explore the idea that cosmic acceleration may be a byproduct of late-time effects like structure formation in two steps. First, we consider the equation of state for an inhomoge…