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Centro de Astrofísica da Universidade do Porto
Exotic singularities in cosmology and varying constants

Mariusz P. Dabrowski
Institute of Physics, University of Szczecin

Abstract
I will present a variety of exotic (non-big-bang) singularities such as sudden future singularities, finite scale factor singularities, big-separation, and w-singularities (or type II-V). I will show that they are of a weak type and do not necessarily exhibit geodesic incompletness and may fit observational data (supernovae, baryon acoustic oscillations, CMB, redshift drift). I will also review how these singularities can be weakened, strengthened, or avoided due to the time-variation of the physical constants such as the speed of light c and the gravitational constant G.

4 February 2014, 13:30

Centro de Astrofísica
Rua das Estrelas
4150-762 Porto

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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