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Titre: Cosmology: the search for twenty-four (or more) functions Auteur:Barrow, John D. Sujet:General Relativity And Quantum Cosmology ; Astrophysics - Cosmology And Nongalactic Astrophysics ; High Energy Physics - Theory Description:
We enumerate the 4(1+F)+2S independent arbitrary functions of space require to describe a general relativistic cosmology containing an arbitrary number of non-interacting fluid (F) and scalar fields (S). Results are also given for arbitrary space dimension and for higher-order gravity theories, where the number increases to 16+4F+2S. Both counts are subject to assumptions about whether the dark energy is a cosmological constant. A more detailed analysis is provided when global homogeneity is assumed and the functions become constants. This situation is also studied in the case where the flat and open universes have compact spatial topologies. This changes the relative generalities significantly and places new constraints on the types of expansion anisotropy that are permitted. The most general compact homogeneous universes containing Friedmann models are spatially flat and described by 8+4F+2S constants. Comparisons are made with the simple 6-parameter lambda-CDM model and physical interpretations provided for the parameters needed to describe the most general cosmological models. Comment: 12 pages, no figs, typos corrected, extra discussion in Sec. V and in refs
Fait partie de:
Phys. Rev. D89, 064022 (2014)
Identifiant:
1401.4344 (ARXIV ID)
Titre:
100 Dinge, von denen du nicht wusstest, dass du sie nicht wusstest : wie Mathematik unsere Welt erklärt / John D. Barrow ; Deutsch von Hucky Maier
Auteur:Barrow, John D Edition:
Deutsch Erstausg. Editeur:
Reinbek bei Hamburg : Rowohlt-Taschenbuch-Verl.
Date:
2010
Collation:
330 S. : Ill., graph. Darst. ; 19 cm
Collection:
Rororo ; 62617
Documents dans cette collection:Rororo Sujet RERO:Mathématiques
- vie quotidienne Note:
Aus dem Engl. übers
Classification:brsw Mathematik ; Beispielsammlung cdu-vsbcvb 51 Identifiant:
9783499626173 (ISBN) No RERO:
R005711247
Titre:
L'art de l'univers : arts et sciences / John D. Barrow ; essai trad. de l'anglais par Christine Le Boeuf
Auteur:Barrow, John D Editeur:
Arles : Actes Sud
Date:
2015
Collation:
467 p. : ill.
Sujet RERO:Art
- Sciences
- Univers
- Nature
- Évolution (biologie) Note:
Traduit de: The artful universe expanded
Classification:cdu-vssicr 524 Identifiant:
9782330034351 (ISBN); http://catalogue.bnf.fr/ark:/12148/cb44330375w (URN) No RERO:
R007875846
Titre:
Das Buch der Universen / John D. Barrow ; aus dem Englischen von Carl Freytag
Auteur:Barrow, John D Contributeur:Freytag, Carl Editeur:
Frankfurt, M. ; New York : Campus
Date:
2011
Collation:
358 S. : Ill.
Sujet RERO:Cosmologie Note:
Übers. von: The book of universe
Classification:brsw Kosmologie ; Einführung cdu-vsbcvb 524.8 Identifiant:
9783593393377 (ISBN) No RERO:
R006369437
Titre:
La grande théorie : les limites d'une explication globale en physique / John D. Barrow ; trad. de l'anglais par Michel Cassé, Loïc Cohen et Guy Paulus
Auteur:Barrow, John D Contributeur:Cassé, Michel Editeur:
Paris : Flammarion
Date:
1996
Collation:
275 p. : ill. ; 18 cm
Collection:
Champs ; 319
Sciences d'aujourd'hui
Documents dans cette collection:Champs. Flammarion
- Sciences d'aujourd'hui. Albin Michel Sujet RERO:loi de la nature
- Métaphysique
- Philosophie
- Symétrie
- Épistémologie
- Sciences Note:
Traduit de: Theories of everything
Identifiant:
2080813196 (ISBN) No RERO:
2249314
Titre: Some Inflationary Einstein-Aether Cosmologies Auteur:Barrow, John D. Sujet:General Relativity And Quantum Cosmology ; Astrophysics - Cosmology And Nongalactic Astrophysics ; High Energy Physics - Theory Description:
We show how to derive several families of accelerating universe solutions to an Einstein-Aether gravity theory. These solutions provide possible descriptions of inflationary behaviour in the early universe and late-time cosmological acceleration. Comment: 10 pages, no figures
Fait partie de:
Phys. Rev. D 85, 047503 (2012)
Identifiant:
1201.2882 (ARXIV ID)
Titre: Some Generalities About Generality Auteur:Barrow, John D. Sujet:General Relativity And Quantum Cosmology ; Astrophysics - Cosmology And Nongalactic Astrophysics ; Physics - History And Philosophy Of Physics Description:
We survey a variety of cosmological problems where the issue of generality has arisen. This is aimed at providing a wider context for many claims and deductions made when philosophers of science choose cosmological problems for investigation. We show how simple counting arguments can be used to characterise parts of the general solution of Einstein's equations when various matter fields are present and with different spatial topologies. Applications are described to the problem of singularities, static cosmological models, cosmic no hair theorems, the late-time isotropisation of cosmological models, and the number of parameters needed to describe a general astronomical universe. Comment: 26 pages, no figures, Chapter 5 in the book 'The Philosophy of Cosmology, eds. K. Chamcham, J. Silk, J.D. Barrow & S. Saunders, Cambridge UP, 2017. arXiv admin note: text overlap with arXiv:1401.4344
Identifiant:
1503.05723 (ARXIV ID)
Li, Baojiu, Barrow, John D
Monthly Notices of the Royal Astronomical Society, 2011, Vol. 413(1), pp.262-270
[Revue évaluée par les pairs]
Oxford University Press
Titre: On the effects of coupled scalar fields on structure formation Auteur:Li, Baojiu; Barrow, John D Sujet:Gravitation ; Methods: Numerical ; Galaxies: Haloes ; Cosmology: Theory ; Dark Energy ; Large - Scale Structure Of Universe Description:
A coupling between a scalar field (representing the dark energy) and dark matter could produce rich phenomena in cosmology. It affects cosmic structure formation mainly through the fifth force, a velocity-dependent force that acts parallel to particle’s direction of motion and proportional to its speed, an effective rescaling of the particle masses and a modified background expansion rate. In many cases, these effects entangle and it is difficult to see which is the dominant one. Here, we perform N -body simulations to study their qualitative behaviour and relative importance in affecting the key structure formation observables, for a model with exponential scalar field coupling. We find that the fifth force, a prominent example of the scalar-coupling effects, is far less important than the rescaling of particle mass or the modified expansion rate in its effects on the matter power spectrum and mass function. In particular, the rescaling of particle masses is shown to be the key factor leading to less concentration of particles in haloes than in Λcold dark matter, a pattern which is also observed in previous independent coupled scalar field simulations.
Fait partie de:
Monthly Notices of the Royal Astronomical Society, 2011, Vol. 413(1), pp.262-270
Identifiant:
0035-8711 (ISSN); 1365-2966 (E-ISSN); 10.1111/j.1365-2966.2010.18130.x (DOI)
Plusieurs versions
Reconstructions of the dark-energy equation of state and the inflationary potential
Barrow, John, Paliathanasis, Andronikos
General Relativity and Gravitation, 2018, Vol.50(7), pp.1-25
[Revue évaluée par les pairs]