Celebrating Gr@vity!
Exactly one hundred years after Einstein's completion of the general theory of relativity, Gr@v gathered some collaborators and friends to celebrate Gr@vity!
Strong Gravity News & Events
PRL cover exhibits Gr@v work
The cover of the Physical Review Letters Vol. 115, issue 21 (November 20th, 2015), exhibits one of the figures of the Gr@v paper Shadows of Kerr black holes with scalar hair [Pedro V. P. Cunha et al., Phys. Rev. Lett. 115, 211102 (2015)] showing the lensing of a boson star with a light ring.
Gulbenkian Foundation distinguishes Pedro Cunha
Calouste Gulbenkian Foundation has awarded one of the 2015 prizes for stimulating research to Gr@v Ph.D. student Pedro Cunha, distinguishing his work/project on black hole shadows. Congratulations Pedro!
Pedro Cunha did his undergraduate in Physics and M.Sc in Astrophysics, both at the University of Coimbra. His M.Sc. thesis was already done within Gr@v under the supervision of C. Herdeiro. Pedro is pursuing his Ph.D. studies at the University of Aveiro and IST-Lisbon.
Holographic Signatures of Cosmological Singularities
Speaker
Thomas Hertog (KU Leuven)
Event date
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GAP room
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Abstract: I will give an overview of the program to use AdS/CFT techniques to explore the classical and quantum dynamics near cosmological singularities.
On progress in constructing explicit solutions in inverse scattering theory
Speaker
Evgeny Lakshtanov (CIDMA)
Event date
Venue
GAP room
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Abstract: Inverse scattering theory is a final step of the well known inverse scattering transform method. It does not represent difficulties in 1+1 models but becomes much more complicated for 1+2 models.
Cosmic Structures in Brans-Dicke like theories
Speaker
Dialektopoulos Konstantinos (Crete University)
Event date
Venue
GAP room
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Abstract: The recent discovery of the accelerated cosmic expansion suggests that our universe may be endowed with a positive cosmological constant Λ. In addition, even though general relativity (GR) is a very successful and well-tested theory, it could be that it is not the final theory of gravity. Brans-Dicke theory is the one of the first and simplest modifications of Einstein’s theory. In this seminar, I will present the study of cosmic structures in Brans-Dicke like scalar-tensor theories in the presence of a positive cosmological constant. I will discuss the validity of the no-hair theorem in the context of such theories. Moreover, I will show that, the black hole solutions in these theories are no different from those in GR and also that the presence of a stationary cosmological event horizon rules out any regular spherical stationary solution, appropriate for the description of a star.
Phase-Space Noncommutativity: From Gravity to Quantum Mechanics.
Speaker
Catarina Bastos (IST)
Event date
Venue
GAP room
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Abstract: A phase-space noncommutativity (NC) is considered in the context of a Kantowski-Sachs cosmological model. Then, the interior of a Schwarzschild black hole is analyzed.
Localized configurations formed by a real scalar field
Speaker
Gyula Fodor (Paris Observatory)
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Venue
GAP room
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Abstract: In general relativity a single massive real scalar field can form long living stable oscillating localized configurations, which are generally called oscillatons. These objects are quite similar to the well known boson stars.
Superradiance in static black hole spacetimes
Speaker
Carolina Benone
Event date
Venue
GAP room
Event type
Shadows of hairy black holes in Physical Review Letters
The paper "Shadows of Kerr black holes with scalar hair" by P. Cunha, C. Herdeiro, E. Radu and H. Rúnarsson has been accepted in Physical Review Letters. This work shows Kerr black holes with scalar hair can exhibit new types of shadows in black hole physics. Observing black hole shadows is the primary target of the Event Horizon Telescope.