Found 4 result(s)

21.04.2016 (Thursday)

Tachyonic Antibranes and the deSitter and Fuzzball Landscapes

Regular Seminar Iosif Bena (Saclay)

at:
14:00 QMW
room G.O. Jones 610
abstract:

Antibranes in backgrounds that have charge dissolved in fluxes are a key ingredient in constructing a landscape (Multiverse) of deSitter vacua in String Theory, and also of constructing microstate solutions corresponding to non-supersymmetric near-extremal black holes. There are several regimes of parameters in which one can study the physics of these antibranes, and I will show that in the regime of parameters where their gravitational backreaction is important, antibranes have a naked singularity that cannot be resolved either by brane polarization or by cloaking with a black hole horizon, and that signals a tachyonic instability. I will also present recent evidence that the theory on the wordvolume of anti-D3 branes is finite to all loops. I will conclude by discussing the implications of these results for the Multiverse paradigm and for the Fuzzball proposal.

09.12.2009 (Wednesday)

Multi-center non-BPS black holes (and what can they teach us about the information paradox)

Triangular Seminar Iosif Bena (Paris)

at:
15:00 IC
room Blackett lecture room 3
abstract:

I will review the construction of BPS and non-BPS multicenter black hole solutions, and describe a class of smooth solutions that have the same charges and asymptotics as black holes, but do not have a horizon. I will then discuss some of the properties of these solutions and argue that they should correspond to typical microstates of extremal black holes. If so, string theory would imply that a classical extremal black hole solution is a thermodynamic approximation of an ensemble of horizonless configurations, and that this solution stops giving a valid description of the physics at the scale of the horizon. I will finish by discussing the extension of this to non-extremal black holes and its implications for the information paradox.

04.06.2009 (Thursday)

Black hole microstate geometries and the information paradox

Regular Seminar Iosif Bena (Saclay)

at:
14:00 QMW
room 410 B
abstract:

21.02.2007 (Wednesday)

Geometric Transitions and Typical Black Hole Microstates

Triangular Seminar Iosif Bena (SPhT Saclay)

at:
15:00 IC
room Lecture Theatre 1, Blackett Lab
abstract: