Strong Gravity News & Events

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Asymptotically AdS spacetimes and isometric embeddings

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Speaker
Steve Willison (IST-Lisbon)
Event date
Venue
GAP room
Event type

Abstract: We present a simple isometric embedding of the nonrotating BTZ black hole spacetime into (3+2)-dimensional Minkowski space and (3+1)-dimensional mathematical AdS space. A one parameter family of embeddings of the physical (2+1) AdS space (i.e. the universal covering of AdS) is obtained by a double Wick rotation from the BTZ case.

Black Hole collisions

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Speaker
Miguel Zilhão
Event date
Venue
GAP room
Event type

Abstract: We review the topic of black hole collisions. We will give an overview of what has been done so far in four dimensional vacuum gravity and we expand on our group's recent efforts of performing black hole collisions in asymptotically de Sitter spaces, Einstein-Maxwell theory and higher-dimensional vacuum gravity.

 

NRHEP Network First Meeting

NRHEP first meeting's poster
Event date
Venue
Physics Amphitheatre
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Event type
The first meeting of the Numerical Relativity and High Energy Physics Network took place at Aveiro University, from 9-13 July 2012. This meeting brought together researchers from Brazil, Italy, Portugal, Spain and the USA, to discuss the state of the art in relativistic gravity and its application in various contexts, ranging from astrophysics to particle physics, using both anaytical and numerical techniques.

From Black Holes to Naked Singularities in Gravitational Collapse

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Speaker
Malafarina (Tata Institute, Mumbai)
Event date
Venue
GAP room
Event type

Abstract: We give a brief overview of naked singularities, how these can form from gravitational collapse and their possible relevance in astrophysics. We investigate how the black hole formation process described by the Oppenheimer-Snyder scenario is affected once small pressures are introduced in the collapsing matter cloud.

n-DBI gravity

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Speaker
Yuki Sato (Nagoya and Niels Bohr Institute)
Event date
Venue
GAP room
Event type

Abstract: n-DBI gravity is a gravitational theory introduced in arXiv:1109.1468[hep-th], motivated by Dirac-Born-Infeld type conformal scalar theory and designed to yield non-eternal inflation spontaneously. I explain that any solution of Einstein gravity with a particular curvature property is a solution of n-DBI gravity.

Palatini theories of gravity and applications to black holes.

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Speaker
Diego Rubiera-Garcia (University of Oviedo)
Event date
Venue
GAP room
Event type

Abstract: We make a broad discussion, both mathematical and physical, of different aspects of Palatini theories of gravity. These theories are defined by the idea that metric and connection are physically independent entities, in such a way that the field equations are obtained by performing independent variations with respect to both of them.

Constrained Hamiltonian systems

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Speaker
Flávio Coelho
Event date
Venue
GAP room
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Event type
In this short course, we review Dirac's method for dealing with constrained systems in the Hamiltonian formalism, including: primary and secondary constraints, first- and second-class constraints, gauge transformations, and counting of degrees of freedom. Examples and exercises, with particular emphasis on gauge field theories (electromagnetism and gravity) will be provided.

General Relativity, Cosmology and Black Holes course

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Speaker
Carlos Herdeiro
Event date
Venue
GAP room
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Event type
An extra curricular course on "General Relativity, Cosmology and Black Holes" will run throughout the second semester 2011/12. Only basic knowledge of special relativity and Newtonian gravity will be assumed. By default, sessions will take place every friday at 14H00 in the GAP room. Some lecture notes will be handed out and exercises will be set in every session and solved in the following one.