[He-sem] High Energy Physics Seminar TOMORROW

[Andrei Khmelnitsky]

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HIGH ENERGY PHYSICS SEMINAR
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Tuesday, 20 DECEMBER 2016, 16:30 p.m.
STASI SEMINAR ROOM - ICTP Leonardo Bldg.


Riccardo PENCO
(University of Pennsylvania, Philadelphia, USA)


"An effective field theory approach to superradiance"


Abstract:  Superradiance is a phenomenon by which a dissipative spinning
object looses angular momentum by amplifying the intensity of scattered
radiation, or by producing particles in a bound state. Black hole
superradiance, in particular, has received significant attention in the
last few years, as it could provide a way of testing indirectly the
existence of ultralight particles beyond the Standard Model. In this talk,
I will discuss a simple and modern approach of superradiance based on
effective field theory techniques. This approach is valid at scales much
larger than the size of the spinning object, and it applies not only to
black holes but to any dissipative object. Along the way, I will also
provide a simple derivation of vacuum friction derivation of vacuum
friction---a "quantum torque" that acts on spinning objects in empty space.
If time will allow it, I will also comment on the relation between
superradiance and tidal dynamics in the Newtonian limit.

http://indico.ictp.it/event/8107/


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