Status  Confirmed 
Seminar Series  APCTH 
Subjects  grqc 
Date  Tuesday 26 November 2019 
Time  14:00 
Institute  APC 
Seminar Room  646A  Mondrian 
Speaker's Last Name  Chen 
Speaker's First Name  Pisisn 
Speaker's Email Address  
Speaker's Institution  National Taiwan University 
Title  Modified theories of gravity and their tests via gravitational waves 
Abstract  In this talk we will review some selected modified theories of gravity and study their cosmological and astrophysical implications. In particular, we investigate the quasinormal modes (QNMs) for black hole solutions in the following modified gravity theories: the Palatini f(R) gravity, the EiBI gravity, a class of nonsingular black holes which can be treated as the vacuum solution of a family of conformal gravity theories, and the generalized energy momentum squared gravity. The master equations describing the QNMs are derived, and the QNM frequencies are evaluated with the WentzelKramers Brillouin (WKB) method and the eikonal approximation. As expected, the QNM spectra of these modified black holes would deviate from their GR counterparts, indicating the possibility of testing these black hole solutions with the help of future gravitational wave detections. 
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