Results 231 to 240 of about 2,376 (273)
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2021
Abstract The main strands of observation in cosmology are presented. These are redshift surveys using standard candles; galaxy distributions; age estimates drawing on a number of strands of evidence; and the CMB radiation. The chapter begins with a discussion of systemtic and statistical error in measurements, and explains the ...
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Abstract The main strands of observation in cosmology are presented. These are redshift surveys using standard candles; galaxy distributions; age estimates drawing on a number of strands of evidence; and the CMB radiation. The chapter begins with a discussion of systemtic and statistical error in measurements, and explains the ...
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Physics Reports, 1985
Abstract Following Kristian and Sach's direct observational approach to cosmology, this paper analyses in detail the information that can be obtained from idealised astronomical observations, firstly in the cosmographic case when no gravitational field equations are assumed, and secondly in the cosmological case when Einstein's field equations of ...
G.F.R. Ellis +4 more
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Abstract Following Kristian and Sach's direct observational approach to cosmology, this paper analyses in detail the information that can be obtained from idealised astronomical observations, firstly in the cosmographic case when no gravitational field equations are assumed, and secondly in the cosmological case when Einstein's field equations of ...
G.F.R. Ellis +4 more
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Observer dependence in quantum cosmology
Physical Review D, 1993The main thesis of this paper is that minisuperspace quantum cosmology reproduces the observer dependence of the vacuum found in quantum field theory in curved spacetime. We show that the vacua picked up by the Hartle-Hawking "no boundary" proposal in two different minisuperspaces sharing the same classical limit ($k=0$ and $k=1$ de Sitter ...
, Calzetta, , Kandus
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2003
Abstract The isotropic 2.7 K blackbody radiation, the 24 per cent cosmic helium abundance, and the similarity between the ages of galaxies and the age of the universe all support the big-bang models derived from general relativity assuming the cosmological principle. Can we test these models in more detail?
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Abstract The isotropic 2.7 K blackbody radiation, the 24 per cent cosmic helium abundance, and the similarity between the ages of galaxies and the age of the universe all support the big-bang models derived from general relativity assuming the cosmological principle. Can we test these models in more detail?
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‘Observational’ Quantum Cosmology
2010Following on the appraisal presented in Chap. 2 of Vol. I, the reader may rightfully be asking: Given the framework of quantum cosmology (QC), where are the boundaries of our knowledge, i.e., what exactly constitutes these limits? What are the best directions to move in, and in particular, what predictions or (falsifiable) tests for the universe can be
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Modern Cosmological Observations
2002I present a brief discussion of recent extragalactic astrophysics observations relevant to Observational Cosmology. I review some recent results on surveys of galaxies, clusters and Active Galactic Nuclei in the optical, X-ray IR and submm part of the spectrum. The cosmological significance of these observations is discussed.
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Cosmology with the Laser Interferometer Space Antenna
Living Reviews in Relativity, 2023Germano Nardini
exaly
Observational cosmology and cosmological models
Soviet Physics Uspekhi, 1987N.S. Kardashev +2 more
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