Cette recherche s'applique uniquement aux ressources en bibliothèque.
227 résultats
Trier par:
Ajouter à la liste:
Étendre à toutes les références (sans texte intégral)
    • Article
    Sélectionner

    Cosmology: the search for twenty-four (or more) functions

    Barrow, John D.
    Phys. Rev. D89, 064022 (2014) [Revue évaluée par les pairs]
    Cornell University
    Disponible
    Plus…
    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)

    • Livre
    Sélectionner

    100 Dinge, von denen du nicht wusstest, dass du sie nicht wusstest : wie Mathematik unsere Welt erklärt

    Barrow, John D
    Reinbek bei Hamburg : Rowohlt-Taschenbuch-Verl.
    2010
    Recherche de la disponibilité
    Plus…
    Chargement
    Erreur de chargement
    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
    Permalien:
    http://data.rero.ch/01-R005711247/html?view=VS_V1

    • Livre
    Sélectionner

    L'art de l'univers : arts et sciences

    Barrow, John D
    Arles : Actes Sud
    2015
    Recherche de la disponibilité
    Plus…
    Chargement
    Erreur de chargement
    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
    Permalien:
    http://data.rero.ch/01-R007875846/html?view=VS_V1

    • Livre
    Sélectionner

    Das Buch der Universen

    Barrow, John D
    Freytag, Carl
    Frankfurt, M. ; New York : Campus
    2011
    Recherche de la disponibilité
    Plus…
    Chargement
    Erreur de chargement
    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
    Permalien:
    http://data.rero.ch/01-R006369437/html?view=VS_V1

    • Livre
    Sélectionner

    La grande théorie : les limites d'une explication globale en physique

    Barrow, John D
    Cassé, Michel
    Paris : Flammarion
    1996
    Recherche de la disponibilité
    Plus…
    Chargement
    Erreur de chargement
    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
    Permalien:
    http://data.rero.ch/01-2249314/html?view=VS_V1

    • Article
    Sélectionner

    Some Inflationary Einstein-Aether Cosmologies

    Barrow, John D.
    Phys. Rev. D 85, 047503 (2012) [Revue évaluée par les pairs]
    Cornell University
    Disponible
    Plus…
    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)

    • Article
    Sélectionner

    Some Generalities About Generality

    Barrow, John D.
    Cornell University
    Disponible
    Plus…
    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)

    • Article
    Sélectionner

    On the effects of coupled scalar fields on structure formation

    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
    Disponible
    Plus…
    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]

    • Plusieurs versions

    Szekeres universes with homogeneous scalar fields

    Barrow, John, Paliathanasis, Andronikos
    The European Physical Journal C, 2018, Vol.78(9), pp.1-8 [Revue évaluée par les pairs]