• Feb 24 2012

    UKZN Node Seminar:

    Prof S G Ghosh

    Astrophysics and Cosmology Research Unit in conjunction with NITheP
    cordially invites you to a seminar by:

    SPEAKER: Prof S G Ghosh, Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi

    TITLE: Gravitational collapse in 5D Einstein-Gauss-Bonnet gravity

    DATES: 24 February 2012

    TIME: 13.15 pm 14:15 pm

    VENUE: Physics seminar room, H block, 3rd rd floor, Physics, University of KwaZulu-Natal (Westville Campus)

    Abstract:
    We consider a Lemaitre - Tolman - Bondi type space-time in Einstein gravity with the Gauss-
    Bonnet combination of quadratic curvature terms, and present exact solutions in closed form.
    It turns out that the presence of the coupling constant of the Gauss-Bonnet terms $alpha > 0$
    completely changes the causal structure of the singularities from the analogous general
    relativistic case. The gravitational collapse of inhomogeneous dust in the five-dimensional
    Gauss-Bonnet extended Einstein equations leads to formation of a massive, but weak, timelike
    singularity which is forbidden in general relativity. Interestingly, this is a counterexample to
    three conjectures: cosmic censorship conjecture, hoop conjecture and Seifert's conjecture.

    Refreshments will served at 12:30pm