Hassan Khalvati

University of Guelph, Canada

Perimeter Institute for Theoretical Physics, Canada

Observational Features in a Beyond Kerr Spacetime

Abstract: Recently, we computed the metric of a vacuum stationary axisymmetric spacetime using Ernst formalism. The metric contains a generic non-Kerr deviation in the quadrupole moment and is accurate up to very high order in the inverse radial distance. Using such a metric, we have tried to study any potential observational feature of such a Beyond-Kerr spacetime. We have studied the deviation in the observable size of the central object by numerical ray-tracing approach and compared the deviation with the critical curve for the Kerr black hole photon sphere. We also concluded that there is a degeneracy in simulating the shape of the central object in the parameter space between spin and the deviation in quadrupole moments of the central object. In addition, we tried to study an EMRI (Extreme Mass Ratio Inspiral) system considering this modified spacetime as the background and calculated the phase difference between the gravitational radiation from this system and the Kerr background. In the end, we have shown that both of these observational features are potentially detectable by future space-based black hole detectors and gravitational wave detectors

یکشنبه  21 آبان 1402، ساعت 17:15

Sunday 12 November 2023 – 17:15 Tehran Time

Hybrid Seminar

آمفی تئاتر دانشکده فیزیک-تالار جناب / Physics Department – Amphitheater- Jenab Hall

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest