Dark energy: mystery of the millennium

By Thanu Padmanabhan. 2006

149 citations recorded by the source corpus.

Nearly seventy per cent of the energy density in the universe is unclustered and exerts negative pressure. This conclusion — now supported by numerous observations — poses the greatest challenge for theoretical physics today. I discuss this issue with special emphasis on the cosmological constant as the possible choice for the dark energy. Several curious features of a universe with a cosmological constant are described and some possible approaches to understand the nature of the cosmological constant are reviewed. In particular, I show how some of the recent ideas, related to a thermodynamic route to gravity, allow us to: (i) create a paradigm in which the bulk value of cosmological constant is irrelevant and (ii) obtain the correct, observed, value for the cosmological constant from vacuum fluctuations in a region confined by the deSitter horizon.

Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/4cbbd7079fb99c30d8d9167fcbe4ef7075f807ca

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In Astronomy and Astrophysics

In Statistical and Nonlinear Physics

Citations in the corpus

Thermodynamic route to field equations in Lanczos-Lovelock gravity (2006, background): “These Lagrangians have the peculiar property [16] that their variation leads to equations of motion that are equivalent to the ordinary partial derivatives of the Lagrangian density with respect to the metric components g,”
Thermodynamical Aspects of Gravity: New insights (2009, background): “In fact, one can state a stronger result [145, 146].”
Thermodynamical aspects of gravity: new insights (2010, background): “In fact, one can state a stronger result [145, 146].”