Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-06
Phys.Rev.Lett.85:4434-4437,2000
Astronomy and Astrophysics
Astrophysics
5 pages, 1 figure, uses psfig. Refs added, slightly enhanced
Scientific paper
10.1103/PhysRevLett.85.4434
Cosmological data suggest that we live in an interesting period in the history of the universe when \rho_\Lambda \sim \rho_M \sim \rho_R. The occurence of any epoch with such a "triple coincidence" is puzzling, while the question of why we happen to live during this special epoch is the "Why now?" problem. We introduce a framework which makes the triple coincidence inevitable; furthermore, the ``Why now?'' problem is transformed and greatly ameliorated. The framework assumes that the only relevant mass scales are the electroweak scale, M_{EW}, and the Planck scale, M_{Pl}, and requires \rho_\Lambda^{1/4} \sim M_{EW}^2/M_{Pl} parametrically. Assuming that the true vacuum energy vanishes, we present a simple model where a false vacuum energy yields a cosmological constant of this form.
Arkani-Hamed Nima
Hall Lawrence J.
Kolda Christopher
Murayama Hitoshi
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