Research areas: Gravitation, Black holes, Wormholes, Cosmology, Gravitational Lensing, Geodesics, Shadow , Hawking Radiation, Greybody factor, Quasinormal modes, Complexity.
Dr. Övgün's research is focused on understanding and constraining modified gravity theories using various properties of black holes and cosmological evolution. He has contributed to various analysis methods, which are now amongst the most widely used ones for calculating the Hawking radiation, gravitational lensing, and shadow cast of black holes. He has been studying various aspects of general relativity in relation to black hole properties, wormholes, compact stars, Hawking radiation, and cosmological inflation. These implications often follow from the structure of extra-dimensional geometries, of which there are many possibilities. Övgün’s research therefore requires importing techniques from mathematics and computer science. He is among World’s Top 2% Scientists in the Stanford University 2020 & 2021 Releases Lists.
He try to address a number of interesting questions in physics, such as:
-Is it possible that the Big Bang could be replaced with a wormhole at the beginning of time?
-Is it possible to create a traversable wormhole?
-How can quantum effects be included in black hole/wormhole thermodynamics?
-What happens at the edge of a Black Hole or inside a Black hole?
-Could Our Universe Be A Hologram? or How Many Dimensions In The Holographic Universe?
-Why is the universe expanding at an accelerating rate?
-How are Brain Cells Like Little Universes? so on...
Topics in Theoretical Physics
Research Topics for M.Sc. and Ph.D Students
- COSMOLOGY: Cosmological models with Nonlinear electrodynamics, Cosmological singularities, Inflation, Acceleration of Universe.
-WORMHOLES: Stability of Thin-shell Wormholes and Lorentzian Wormholes (WHs).
-GRAVITATIONAL LENSING & SHADOW CAST: Weak/Strong Gravitational Lensing, Light Deflection with Topological Defects and Gauss-Bonnet Theorem, Shadow of the Black holes/ Wormholes, Thin-accretion disk.
-COMPACT STARS & GRAVASTARS
-WAVE PROPERTIES OF BHs & WHs: Hawking Radiation, Quasinormal Modes of Black Holes, Greybody factors, Quantum Singularities.
-PARTICLE PROPERTIES OF BHs & WHs: Geodesics and BSW effect of BHs/WHs, Particle Acceleration by BHs/Whs
-BLACK HOLE CHEMISTRY: Thermodynamics with Lambda, P-V Criticality, Phase Transitions, Super-entropic BH, Van der Waals fluids, Holographic Thermodynamics
-ENTANGLEMENT & COMPLEXITY: Quantum complexity inside black holes; Action Growth Rates
-MODIFIED GRAVITY THEORIES: Bumblebee model of gravity, Gauss-Bonnet gravity, f(R) gravity et.c
Dr. Övgün's research is focused on understanding and constraining modified gravity theories using various properties of black holes and cosmological evolution. He has contributed to various analysis methods, which are now amongst the most widely used ones for calculating the Hawking radiation, gravitational lensing, and shadow cast of black holes. He has been studying various aspects of general relativity in relation to black hole properties, wormholes, compact stars, Hawking radiation, and cosmological inflation. These implications often follow from the structure of extra-dimensional geometries, of which there are many possibilities. Övgün’s research therefore requires importing techniques from mathematics and computer science. He is among World’s Top 2% Scientists in the Stanford University 2020 & 2021 Releases Lists.
He try to address a number of interesting questions in physics, such as:
-Is it possible that the Big Bang could be replaced with a wormhole at the beginning of time?
-Is it possible to create a traversable wormhole?
-How can quantum effects be included in black hole/wormhole thermodynamics?
-What happens at the edge of a Black Hole or inside a Black hole?
-Could Our Universe Be A Hologram? or How Many Dimensions In The Holographic Universe?
-Why is the universe expanding at an accelerating rate?
-How are Brain Cells Like Little Universes? so on...
Topics in Theoretical Physics
Research Topics for M.Sc. and Ph.D Students
- COSMOLOGY: Cosmological models with Nonlinear electrodynamics, Cosmological singularities, Inflation, Acceleration of Universe.
-WORMHOLES: Stability of Thin-shell Wormholes and Lorentzian Wormholes (WHs).
-GRAVITATIONAL LENSING & SHADOW CAST: Weak/Strong Gravitational Lensing, Light Deflection with Topological Defects and Gauss-Bonnet Theorem, Shadow of the Black holes/ Wormholes, Thin-accretion disk.
-COMPACT STARS & GRAVASTARS
-WAVE PROPERTIES OF BHs & WHs: Hawking Radiation, Quasinormal Modes of Black Holes, Greybody factors, Quantum Singularities.
-PARTICLE PROPERTIES OF BHs & WHs: Geodesics and BSW effect of BHs/WHs, Particle Acceleration by BHs/Whs
-BLACK HOLE CHEMISTRY: Thermodynamics with Lambda, P-V Criticality, Phase Transitions, Super-entropic BH, Van der Waals fluids, Holographic Thermodynamics
-ENTANGLEMENT & COMPLEXITY: Quantum complexity inside black holes; Action Growth Rates
-MODIFIED GRAVITY THEORIES: Bumblebee model of gravity, Gauss-Bonnet gravity, f(R) gravity et.c
SUPERVISORSHIPS
PhD Supervisor: YASHMITHA KUMARAN
Weak Deflection Angle via Gauss-Bonnet Theorem, 2018-Now.
MSc Supervisor: FLORA BABAYEVA
Shadow Cast of The Schwarzschild-like Black Holes, 2020-2022.
MSc Supervisor: HAMZA SABER ZEBARI
Newtonian Cosmology, 2018-2020.
MSc Supervisor: GABRIEL WIRDZELII JOSEPH
Cosmology with Varying Physical Constants, 2018-2020.
MSc Supervisor: HUSEYIN KARYAL
Geodesics of Black Holes in Bumblebee Gravity Theory, 2018-2020.
MSc Co-Supervisor: İLİM İRFAN ÇİMDİKER (SABANCI UNI.) Black Hole Shadow in Symmergent Gravity, 2021 (Supervisor: Prof. Dr. Durmuş Ali Demir)
BSc Co-Supervisor: CEREN H. BAYRAKTAR (IYTE-TURKEY)
Thermodynamics of regular black holes with cosmic strings, European Physical Journal - Plus 2018. (Supervisor: Prof. Dr. Durmuş Ali Demir)
BSc Co-Supervisor: MERT OKYAY (MIAMI UNI.-USA)
Nonlinear electrodynamics effects on the black hole shadow, deflection angle, quasinormal modes and greybody factors, Journal of Cosmology and Astroparticle Physics 2022.
PhD Supervisor: YASHMITHA KUMARAN
Weak Deflection Angle via Gauss-Bonnet Theorem, 2018-Now.
MSc Supervisor: FLORA BABAYEVA
Shadow Cast of The Schwarzschild-like Black Holes, 2020-2022.
MSc Supervisor: HAMZA SABER ZEBARI
Newtonian Cosmology, 2018-2020.
MSc Supervisor: GABRIEL WIRDZELII JOSEPH
Cosmology with Varying Physical Constants, 2018-2020.
MSc Supervisor: HUSEYIN KARYAL
Geodesics of Black Holes in Bumblebee Gravity Theory, 2018-2020.
MSc Co-Supervisor: İLİM İRFAN ÇİMDİKER (SABANCI UNI.) Black Hole Shadow in Symmergent Gravity, 2021 (Supervisor: Prof. Dr. Durmuş Ali Demir)
BSc Co-Supervisor: CEREN H. BAYRAKTAR (IYTE-TURKEY)
Thermodynamics of regular black holes with cosmic strings, European Physical Journal - Plus 2018. (Supervisor: Prof. Dr. Durmuş Ali Demir)
BSc Co-Supervisor: MERT OKYAY (MIAMI UNI.-USA)
Nonlinear electrodynamics effects on the black hole shadow, deflection angle, quasinormal modes and greybody factors, Journal of Cosmology and Astroparticle Physics 2022.
