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Sharif University of Technology - Weekly Cosmology Seminar ( Sunday- 21 August 2016 - 31 Mordad 1395)

دانشکده فیزیک دانشگاه صنعتی شریف

 

سمینار هفتگی گروه کیهان شناسی

 

Testing the Kerr Black Hole Hypothesis: Black Hole Shadow

معصومه قاسمی (دانشگاه فودان، شانگهای چین(

Masoumeh Ghasemi

Fudan University, Shanghai

 

Abstract:   Black hole (BH) shadow is a dark area over a bright background. It is unstable orbit of constant radius of photon around BH surrounded by optically thin emitting medium. The exact shape of shadow is only determined by spacetime metric. Image of shadow is strong evidence for existence of BHs and event horizon. It is widely believed Sgr A* is most likely a supermassive BH in the Galactic center but there is lack of observational evidence for existence of its event horizon. VLBI observations with Event Horizon telescope in mm/sub-mm band will image Sgr A* shadow soon. Moreover, an accurate measure of shape of shadow can constrain possible deviations from Kerr solution of General Relativity and breaks degeneracy of other observational tests of strong gravity regime. In this talk, I will present shadow of some non-Kerr BHs to constrain possible deviations from Kerr geometry.

 

  

 

یکشنبه31 مرداد ماه 1395، ساعت 10:00

    دانشکده فیزیک، فیزیک 4

physics.sharif.edu/~cosmology/