Susskind's Challenge to the Hartle-Hawking No-Boundary Proposal and Possible Resolutions

Details Susskind's Challenge to the Hartle-Hawking No-Boundary Proposal and Possible Resolutions Susskind's Challenge to the Hartle-Hawking No-Boundary Proposal and Possible Resolutions

2006-10-18

arxiv.org/abs/hep-th/0610199v2

JCAP 0701:004,2007

Physics

High Energy Physics

High Energy Physics - Theory

24 pages, LaTeX, 8 references added and a distinction between Linde's and Vilenkin's tunneling proposals

Scientific paper

10.1088/1475-7516/2007/01/004

Given the observed cosmic acceleration, Leonard Susskind has presented the following argument against the Hartle-Hawking no-boundary proposal for the quantum state of the universe: It should most likely lead to a nearly empty large de Sitter universe, rather than to early rapid inflation. Even if one adds the condition of observers, they are most likely to form by quantum fluctuations in de Sitter and therefore not see the structure that we observe. Here I present my own amplified version of this argument and consider possible resolutions, one of which seems to imply that inflation expands the universe to be larger than 10^{10^{10^{122}}} Mpc.

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