A small but nonzero cosmological constant

Details A small but nonzero cosmological constant A small but nonzero cosmological constant

1999-11-13

arxiv.org/abs/hep-th/9911102v3

Int.J.Mod.Phys.D10:49-56,2001

Physics

High Energy Physics

High Energy Physics - Theory

A discussion on the form of the cosmological constant (inversely proportional to the square of the cosmic scale factor) after

Scientific paper

10.1142/S0218271801000627

Recent astrophysical observations seem to indicate that the cosmological constant is small but nonzero and positive. The old cosmological constant problem asks why it is so small; we must now ask, in addition, why it is nonzero (and is in the range found by recent observations), and why it is positive. In this essay, we try to kill these three metaphorical birds with one stone. That stone is the unimodular theory of gravity, which is the ordinary theory of gravity, except for the way the cosmological constant arises in the theory. We argue that the cosmological constant becomes dynamical, and eventually, in terms of the cosmic scale factor $R(t)$, it takes the form $\Lambda(t) = \Lambda(t_0)(R(t_0)/R(t))^2$, but not before the epoch corresponding to the redshift parameter $z \sim 1$.

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