Strong Gravity News & Events

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NRHEP Network First Meeting

NRHEP first meeting's poster
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Venue
Physics Amphitheatre
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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
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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
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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
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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
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Venue
GAP room
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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
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Venue
GAP room
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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.

Deformation method and applications

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Speaker
Laercio Losano (U. Federal da Paraíba)
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Venue
GAP room
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Abstract: We develop a procedure for models described by one real scalar field in (1+1) dimensions, that makes posible to obtain new models and their static solutions straightforwardly from one known model. The method is illustrated by some applications and extended byp traveling wave solutions of systems described by high-order partial differential equations. 

Hawking radiation for Proca field

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Speaker
Mengjie Wang
Event date
Venue
GAP room
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Abstract: Recently we have investigated the wave equation of a massive vector boson, which is governed by Proca field, in the D-dimensional Schwarzschild background. Because the mass term introduce a coupling between two physical degrees of freedom, we have to solve s set of coupled ordinary differential equations.

Apparent Horizons

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Speaker
Carlos Herdeiro
Event date
Venue
GAP room
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Abstract: I will introduce the local concept of Apparent Horizon, provide examples, and show how it is related to the global concept of Event Horizon. I will discuss the first fully non-linear numerical simulations of black hole binaries in a de Sitter universe and comment on the various types of apparent horizons that can be found (black hole, white hole and cosmological).