PIRSA Logo


PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: Federico Piazza


PIRSA:17080058  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Universality classes of inflation as phases of condensed matter: slow-roll, solids, gaugids etc.
Speaker(s): Federico Piazza
Abstract: Universality classes of inflation as phases of condensed matter: slow-roll, solids, gaugids etc. Abstract: Cosmology and condensed matter systems share the same basic symmetries: both are characterised by a (spontaneous) breaking of Lorentz boosts and by approximate translation and rotation invaria... read more
Date: 22/08/2017 - 11:00 am

PIRSA:14050113  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Relativity of non relativistic systems
Speaker(s): Federico Piazza
Abstract: To the best of our knowledge, the fundamental laws of physics are Lorentz invariant. This means that condensed matter systems at finite density still display full Lorentz symmetry: it is just spontaneously broken (i.e. by state considered) and thus non-linearly realized. This simple observation allo... read more
Date: 30/05/2014 - 9:00 am

PIRSA:04050000  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Modifying Gravity in the Infra-Red by imposing an Ultra-Strong equivalence principle.
Speaker(s): Federico Piazza
Abstract: I will give account of a work in progress in which I attempt to modify the metric-manifold structure of GR in the infra-red. The proposed modification does not contain any massive parameter as it is effective at length scales comparable with the inverse (extrinsic) curvature. The guiding line for th... read more
Date: 27/05/2009 - 3:45 pm

PIRSA:08090054  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Particle detector models, entropy and localization in semiclassical gravity
Speaker(s): Federico Piazza
Abstract:
Date: 04/09/2008 - 4:00 pm

PIRSA:08070013  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Coupling variations and equivalence principle violations in string inspired scenarios
Speaker(s): Federico Piazza
Abstract: I will describe how and why coupling variations and violations of the equivalence principle are generally expected in string theory and focus on two main scenarios/realizations: the Damour-Polyakov and the runaway dilaton.
Date: 15/07/2008 - 12:00 pm

PIRSA:08040072  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Particle Detector Model Questions the Unruh Effect
Speaker(s): Federico Piazza
Abstract: The Hamiltonian of traditionally adopted detector models features out of diagonal elements between the vacuum and the one particle states of the field to be detected. We argue that reasonably good detectors, when written in terms of fundamental fields, have a more trivial response on the vacuum. In ... read more
Date: 30/04/2008 - 4:00 pm

PIRSA:06010010  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Spacetime regions as "quantum subsystems": glimmers of a pre-geometric perspective
Speaker(s): Federico Piazza
Abstract: Space-time measurements and gravitational experiments are made by the mutual relations between objects, fields, particles etc... Any operationally meaningful assertion about spacetime is therefore intrinsic to the degrees of freedom of the matter (i.e. non-gravitational) fields and concepts such as ... read more
Date: 19/01/2006 - 11:00 am

PIRSA:06010005  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Gravity and cosmology of the dilaton at "strong coupling"
Speaker(s): Federico Piazza
Abstract: A definite prediction of string theory is the existence of a scalar field, the dilaton. The presence of the dilaton generally leads to strong violations of the equivalence principle and thus describe a kind of gravitational force radically different from what we experience. String loop corrections, ... read more
Date: 17/01/2006 - 4:00 pm
Valid XHTML 1.0!