Results 281 to 290 of about 5,429,060 (314)

Cosmology with the Laser Interferometer Space Antenna [PDF]

open access: yesLiving Reviews in Relativity, 2023
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravitational-wave backgrounds and their implications for early universe and ...
Katy Clough   +2 more
exaly   +1 more source

Cosmology and String Theory

open access: yesFundamental Theories of Physics, 2019
Cosmology describes the evolution of the Universe and is based on a description of its beginning from quantum fluctuations. String theory is the only known consistent theory of quantum gravity that can deal with the highest energy scales near the Planck ...
Horatiu Nastase
exaly   +2 more sources

The Story of Cosmological Theory

Science, 1917
Blank misgivings of a creature Moving about in worlds not realized. For him, perhaps it was enough to taste the joy of living, to watch the rising and the setting of the sun, to gaze upon the mountain, the river and the restless sea, and never to ask himself the question "what is this world in which I live, and how did it come into being?" But this ...
openaire   +2 more sources

Chaos in M-theory Cosmology [PDF]

open access: possibleFortschritte der Physik, 2001
Summary: We review some recent work by \textit{T. Damour} and the author [Phys. Rev. Lett. 85, 920-923 (2000; Zbl 0978.83053)] on the chaotic behaviour of the gravitational field in the vicinity of a spacelike singularity in \(M\)-theory and superstring models. We stress in particular the rôle of the massless \(p\)-forms in this context.
openaire   +2 more sources

Quantum Cosmology in CGBD Theory

International Journal of Theoretical Physics, 2002
A quantum cosmological model of gravitation interacting with a charged Brans-Dicke type scalar field has been discussed in the Pauli frame. The Wheeler-DeWitt equation is solved in the semi classical approximation by applying the WKB approximation. The wave function of the universe is obtained by applying Vilenkin-like and Hartle-Hawking-like boundary ...
Yang, GH   +4 more
openaire   +3 more sources

COSMOLOGICAL PERTURBATIONS IN GENERALIZED GRAVITY THEORIES

Modern Physics Letters A, 1996
We present cosmological perturbation theory based on generalized gravity theories including string correction terms as well as a tachyonic complication. The classical evolution as well as the quantum generation processes in these variety of gravity theories are presented in unified forms. These apply both to the scalar- and tensor-type perturbations.
Noh, Hyerim, Hwang, Jai-Chan
openaire   +2 more sources

Quantum Field Theory and Cosmology

1982
Experimental evidence points with ever increasing confidence towards an evolutionary cosmology. The standard framework used to confront this circumstance is the “hot big bang” theory: an initial classical singularity, possibly smeared by unknown quantum effects, produces a thermal distribution of the quanta of the matter field at a temperature close to
openaire   +2 more sources

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