Colloquium Seminar Announcement Prof. Petr Hořava UC Berkeley, Lawrence Berkeley Laboratory " Chronology Protection and Astrophysics of Compact Objects in String Theory " Date: Monday May 9, 2005 55 Roessler Time: 4:10 pm. Abstract: Classical general relativity is known to admit solutions with closed time-like curves, suggesting possible violations of chronology and causality. In string theory, such chronology-violating solutions are modified due to a variety of stringy effects, involving novel phenomena such as brane expansion and domain wall nucleation, leading to the restoration of chronology. As a result, string theory allows a broader class of consistent solutions compared to classical general relativity. This phenomenon can have significant astrophysical implications, suggesting the possibility of compact "superspinning" objects whose angular momentum consistently violates the conventional Kerr bound.

E-Mail: horava@berkeley.edu
Web Page: http://www-theory.lbl.gov/~horava/index.html