Results 271 to 280 of about 1,577,801 (299)
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Physical Review, 1969
Summary: The Hamiltonian methods of Arnowitt, Deser, and Misner can be applied to homogeneous cosmological models, and prove to be an efficient way both of constructing the Einstein equations and of studying their solutions. By using an appropriate form for the metric, one finds that the constraint equations for these models can be solved explicitly ...
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Summary: The Hamiltonian methods of Arnowitt, Deser, and Misner can be applied to homogeneous cosmological models, and prove to be an efficient way both of constructing the Einstein equations and of studying their solutions. By using an appropriate form for the metric, one finds that the constraint equations for these models can be solved explicitly ...
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Superstrings in quantum cosmology
Physical Review D, 1992We consider the dynamics of a four-dimensional universe using the pointlike field-theory effective action of superstrings. We use the boundary conditions of Hartle and Hawking and Vilenkin to solve the Wheeler-DeWitt equation. We find that under certain conditions the Universe will tunnel from a Euclidean regime to a Lorentzian regime.
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The Cosmological Constant in Quantum Cosmology
AIP Conference Proceedings, 2008Hawking proposed that the cosmological constant is probably zero in quantum cosmology in 1984. By using the right configuration for the wave function of the universe, a complete proof is found very recently.
Zhong Chao Wu +3 more
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Loop Quantum Cosmology: A brief review
, 2016In the last decade, progress on quantization of homogeneous cosmological spacetimes using techniques of loop quantum gravity has led to insights on various fundamental questions and has opened new avenues to explore Planck scale physics.
I. Agulló, Parampreet Singh
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Inflation and quantum cosmology
Physica Scripta, 1990Contents: 1. Introduction; 2. Chaotic inflation; 3. Self-reproducing inflationary universe; 4. Adjusting to the new paradigm: absence of cosmological constraints on the axion mass in the inflationary cosmology; 5. Inflation and the wave function of the universe; 6. Chaotic inflation versus extended inflation; 7. Stochastic approach to the baby universe
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Quantum guidelines for solid-state spin defects
Nature Reviews Materials, 2021Gary Wolfowicz +2 more
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Weyl, Dirac and high-fold chiral fermions in topological quantum matter
Nature Reviews Materials, 2021M Zahid Hasan +2 more
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Quantum Cosmology and the Cosmological Constant
1991The origin of our universe and the small scale structure of spacetime lie deep in the realm of quantum theory, yet they seem to relate to the large scale features of the universe. The value of the cosmological constant is probably zero, but a small value related to a light particle mass is possible.
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The germanium quantum information route
Nature Reviews Materials, 2020Giordano Scappucci +2 more
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Materials challenges for trapped-ion quantum computers
Nature Reviews Materials, 2021Kenneth R Brown +2 more
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