Cosmological constant vs. quintessence

Details Cosmological constant vs. quintessence Cosmological constant vs. quintessence

2000-05-04

arxiv.org/abs/hep-ph/0005037v1

Int.J.Theor.Phys. 39 (2000) 1859-1875

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 2 figures, lectures at Les Houches summer school 'The early Universe" and Peyresq 4 meeting, July 1999

Scientific paper

There is some evidence that the Universe is presently undergoing accelerating expansion. This has restored some credit to the scenarios with a non-vanishing cosmological constant. From the point of view of a theory of fundamental interactions, one may argue that a dynamical component with negative pressure is easier to achieve. As an illustration, the quintessence scenario is described and its shortcomings are discussed in connection with the nagging ``cosmological constant problem''.

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