Susskind's challenge to the Hartle–Hawking no-boundary proposal and possible resolutions

@article{Page2007SusskindsCT,
  title={Susskind's challenge to the Hartle–Hawking no-boundary proposal and possible resolutions},
  author={D. Page},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2007},
  volume={2007},
  pages={004-004}
}
  • D. Page
  • Published 2007
  • Physics
  • Journal of Cosmology and Astroparticle Physics
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… Expand
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References

SHOWING 1-10 OF 219 REFERENCES
Space for both no boundary and tunneling quantum states of the universe
At the minisuperspace level of homogeneous models, the bare probability for a classical universe has a huge peak at small universes for the Hartle-Hawking `no-boundary' wavefunction, in contrast toExpand
Why does inflation start at the top of the hill
We show why the universe started in an unstable de Sitter state. The quantum origin of our universe implies one must take a ``top down'' approach to the problem of initial conditions in cosmology, inExpand
Birth of inflationary universes
A cosmological model is proposed in which the Universe is created by quantum tunneling from ''nothing'' into a de Sitter space. The tunneling is described by a de Sitter-- p Hawking--Moss instanton.Expand
Predictions from quantum cosmology.
  • Vilenkin
  • Physics, Medicine
  • Physical review letters
  • 1995
TLDR
The picture that has emerged from this line of development is that a small closed universe can spontaneously nucleate out of nothing, where by ‘nothing’ I mean a state with no classical space and time. Expand
Prospects of Inflationary Cosmology
In this review I briefly describe the evolution of the inflationary theory from the scenario based on the idea of supercooling and expansion in the false vacuum toward the theory of eternallyExpand
Spontaneous creation of inflationary universes and the cosmic landscape
We study some gravitational instanton solutions that offer a natural realization of the spontaneous creation of inflationary universes in the brane world context in string theory. Decoherence due toExpand
Stationarity of inflation and predictions of quantum cosmology.
TLDR
A new mechanism is proposed which may help solve the cosmological constant problem and is given examples of models where each of these possibilities can be realized, and some implications for quantum cosmology are discussed. Expand
Patching up the no boundary proposal with virtual Euclidean wormholes
In quantum cosmology, one often considers tunneling phenomena which may have occurred in the early universe. Processes requiring quantum penetration of a potential barrier include black hole pairExpand
Holographic probabilities in eternal inflation.
  • R. Bousso
  • Physics, Medicine
  • Physical review letters
  • 2006
TLDR
It is proposed to estimate the probability for observers to emerge in a given vacuum by the entropy that can be produced in a local patch, which allows for prior-free predictions. Expand
Open inflation from nonsingular instantons: Wrapping the universe with a membrane
The four-form field recently considered by Hawking and Turok couples naturally to a charged membrane, across which the effective cosmological constant has a discontinuity. We present instantons forExpand
...
1
2
3
4
5
...