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Singularities and Horizons: From Blackholes to Cosmology

11 - 14 June 2019

Venue: Lorentz Center@Snellius

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The theory
of general relativity (GR) is a very well posed theory of gravity in the
infrared (IR), the gravitational inverse-square law has been tested to a great
accuracy from length scales of micro meters (in a table top experiment) to the
solar systems. Furthermore, detection of gravitational waves (from mergers of
blackholes and neutron stars) in LIGO/VIRGO, and the cosmological observations
such as Big Bang Nucleosynthesis, including the large scale structures in the
Universe have not seen any detectable deviation from GR, yet. In spite of
this great success the cosmological and black hole singularities are intriguing
features of GR at short distances and small time scales, i.e. in the
ultraviolet (UV), where the theory is unable to make any prediction. It is a
fundamental problem, which persists both classically and quantum mechanically -
ameliorating such singularities is a key outstanding problem in the field of
GR. The presence of singularities crucially limits our understanding of the
initial conditions for inflation, believed to be one of the key paradigms for
seeding the primordial density perturbations for the large
scale structures in the Universe, and the observed cosmic microwave
background radiation and its anisotropy. In the context of blackholes, the
formation of a singularity leads to formation of an apparent, and eventually an
event horizon, which gives rise to the famous Hawking’s information loss
paradox, which has kept on baffling the community for a long time.

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Workshop files

poster

scientific report

Scientific organizers:

Robert Brandenberger, McGill University

Valeri Frolov, University of Alberta

Samir Mathur, Ohio State U

Anupam Mazumdar, University Groningen

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