WebMay 24, 2024 · Realising the no-boundary proposal of Hartle and Hawking as a consistent gravitational path integral has been a long-standing puzzle. In particular, it was demonstrated by Feldbrugge et al.that the sum over all universes starting from zero size results in an unstable saddle point geometry. Here we show that in the context of gravity … WebWe show that within the framework of a definite proposal for the initial conditions for the universe, the Hartle–Hawking “no boundary” proposal, open inflation is generic and does not require any special properties of the inflaton potential. In the simplest inflationary models, the semiclassical approximation to the Euclidean path ...
[1708.05104] No Rescue for the No Boundary Proposal
WebJan 9, 2007 · Given the observed cosmic acceleration, Leonard Susskind has presented the following argument against the Hartle–Hawking no-boundary proposal for the quantum … WebGiven the observed cosmic acceleration, Leonard Susskind has presented the following argument against the Hartle-Hawking no-boundary proposal for the quantum state of … ember facebook
The No-Boundary Proposal - How Stephen Hawking Worked
WebJul 19, 2024 · Stephen Hawking’s no boundary proposal (Hawking-Hartle model) I will focus on the Hawking-Hartle model below — but much of the evaluation will apply to Vilenken’s and other related models. Quantum gravity models. While GR is dominant at the large scale, there is another theory that reigns at the sub-atomic level — quantum … WebMain Sources: Before the Big Bang 5: The No Boundary Proposal (brilliant documentary by skydivephil featuring Stephen Hawking, James Hartle and Thomas Hertog); Stephen Hawking, The Universe in a Nutshell Stephen … The Hartle–Hawking state is a proposal in theoretical physics concerning the state of the Universe prior to the Planck epoch. It is named after James Hartle and Stephen Hawking. Hartle and Hawking suggest that if we could travel backwards in time towards the beginning of the Universe, we would note that quite … See more The Hartle–Hawking state is the wave function of the Universe—a notion meant to figure out how the Universe started—that is calculated from Feynman's path integral. More precisely, it is a hypothetical vector in the See more • Imaginary time • Multiple histories • Signature change • Universal wavefunction See more foreach array in array php