PIRSA:15080032

Mass gap for black hole formation in higher derivative and ghost-free gravity

Frolov, V. (2015). Mass gap for black hole formation in higher derivative and ghost-free gravity. Perimeter Institute. https://pirsa.org/15080032

Frolov, Valeri. Mass gap for black hole formation in higher derivative and ghost-free gravity. Perimeter Institute, Aug. 14, 2015, https://pirsa.org/15080032 

          @misc{ pirsa_PIRSA:15080032,
            doi = {10.48660/15080032},
            url = {https://pirsa.org/15080032},
            author = {Frolov, Valeri},
            keywords = {Quantum Gravity, Strong Gravity},
            language = {en},
            title = {Mass gap for  black hole formation in higher derivative and ghost-free gravity},
            publisher = {Perimeter Institute},
            year = {2015},
            month = {aug},
            note = {PIRSA:15080032 see, \url{https://pirsa.org}}
          }

Valeri Frolov

University of Alberta

Talk number
PIRSA:15080032
Collection
Talk Type
Subject
Abstract
The problem of the gravitational collapse of small mass in the higher derivative and ghost free theories of gravity is discussed. It will be demonstrated how higher derivative and non-local modifications of gravity equations regularizes static and dynamical solutions. Boosting a static solution of the linearized equations for the gravitational potential of a point mass we obtain a solution for the field of the ultra-relativistic source (gyraton). Using the latter we construct solutions for the collapsing spherical (thin and thick) null shell. By analysing the obtained solutions we demonstrate that for small enough value of the mass M an apparent horizon is not formed for the gravitational collapse of small mass in the higher-derivative and ghost free theories of gravity. We demonstrate that this “mass gap” property is connected with the presence of the UV cut-off in such theories.