Strong Gravity News & Events

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Cosmic Structures in Brans-Dicke like theories

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Speaker
Dialektopoulos Konstantinos (Crete University)
Event date
Venue
GAP room
Event type
Seminars
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.
Strong Gravity
Cosmology

Localized configurations formed by a real scalar field

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Speaker
Gyula Fodor (Paris Observatory)
Event date
Venue
GAP room
Event type
Seminars

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.

Strong Gravity

Gr@v RISEs

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Gr@v is a partner of the recently approved "Strong Gravity and High Energy Physics" Marie Curie RISE (Research and Innovation Staff Exchange) action, within the Horizon 2020 European framework. This network has a lifetime of 4 years, starting in Jan 2016 and connects 8 nodes in 7 countries, being coordinated by Prof. Ulrich Sperhake and Cambridge University.

Strong Gravity
High Energy Physics