RESEARCH
<< back
Strategies to determine the sign of the spatial curvature

Diego Pavůn
Univ. Autonoma de Barcelona, Spain

Abstract

The second law of thermodynamics in presence of gravity is known to hold at small scales, as in the case of black holes and self-gravitating radiation spheres. Using the Friedmann-Lema^{i}tre-Robertson-Walker metric and the history of the Hubble factor, we argue that this law also holds at cosmological scales. Then, we study the connection between the deceleration parameter and the spatial curvature parameter of the metric and set limits on it valid for any homogeneous and isotropic cosmological model. Likewise, we devise strategies to determine the sign of the index of the spatial curvature. Finally assuming the lambda cold dark matter model correct, we find that the acceleration of the cosmic expansion is increasing today.

2017 July 17, 10:00

IA/U.Lisboa
Faculdade de CiÍncias da Universidade de Lisboa (C6.2.51)
Campo Grande, 1749-016 Lisboa

Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda√ß√£o para a Ci√™ncia e a Tecnologia
OUTREACH