Strong Gravity News & Events

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Black Holes Lessons from Multipole Ratios: A New Window into Black Holes

Speaker
Iosif Bena (Université Paris Saclay)
Event date
Venue
room 11.1.31 (Dep. Math.) and online
Event type

We compute gravitational mass and angular momentum multipole moments for four-dimensional black holes and fuzzball geometries thereof. For Kerr and for supersymmetric black holes many multipole moments vanish, but we show that an infinite number of ratios of vanishing multipoles are constant.

Kerr (smooth) deviations and Symmetries

Speaker
Georgios O. Papadopoulos
Event date
Venue
room 11.1.31 (Dep. Math.) and online
Event type

A novel approach in constructing deviations of the Kerr spacetime whereas
the symmetries can be preserved is presented. The method was applied
trivially in all known classical black-hole spacetimes tested, while
provides the possibility of testing and inventing deformations of Kerr in
a quick and innovative way. The methodology is based on earlier work by

Why can't time run backwards?

Speaker
Prof. Anthony James Leggett (Professor Emeritus, University of Illinois, USA)
Event date
Venue
room 11.1.2 and online
Event type

We can all tell when a movie of some everyday event, such as a kettle boiling or a glass shattering, is run backwards. Similarly, we all feel that we can remember the past and affect the future, not vice versa.