Ara es mostren els items 21-40 de 44

  • Non-extensive statistics to the cosmological lithium problem 

    Hou, S.Q.; He, J.J.; Parikh, Anuj Ramesh (2017-01-11)
    Article
    Accés obert
    Big Bang nucleosynthesis (BBN) theory predicts the abundances of the light elements D, 3He, 4He, and 7Li produced in the early universe. The primordial abundances of D and 4He inferred from observational data are in good ...
  • Nonsingular models of universes in teleparallel theories 

    Haro Cases, Jaume; Amorós Torrent, Jaume (2013-02-14)
    Article
    Accés obert
    Different models of universes are considered in the context of teleparallel theories. Assuming that the universe is filled by a fluid with an equation of state P ¼ f ð Þ , for different teleparallel theories ...
  • Note on bouncing backgrounds 

    Haro Cases, Jaume; Pan, Supriya (American Physical Society (APS), 2018-05-15)
    Article
    Accés obert
    The theory of inflation is one of the fundamental and revolutionary developments of modern cosmology that became able to explain many issues of the early Universe in the context of the standard cosmological model (SCM). ...
  • Origin and modelling of cold dark matter halo properties: IV. Triaxial ellipticity 

    Salvador-Solé, Eduard; Serra, Sinué; Manrique, Alberto; González Casado, Guillermo (2011-04-15)
    Report de recerca
    Accés obert
    In the three preceding papers in the series, we presented a model dealing with the global and small-scale structure and kinematics of hierarchically assembled, virialised, collisionless systems, which correctly accounted ...
  • Un passeig per l'univers 

    Guntín, Toni (Escola Politècnica Superior d'Enginyeria de Manresa, 2009-11-13)
    Audiovisual
    Accés obert
    S'expliquen els objectes del cel profund i l'aspecte i característiques dels cossos del sistema solar.
  • La Pluralité des mondes habités... [etc.] 

    Flammarion, Camille (Didier et Cie, 1865)
    Llibre
    Accés obert
  • Quintessential inflation at low reheating temperatures 

    Aresté Saló, Llibert; Haro Cases, Jaume (2017-11-23)
    Article
    Accés obert
    We have tested some simple quintessential inflation models, imposing the requirement that they match with the recent observational data provided by the BICEP and Planck team and leading to a reheating temperature, which ...
  • R+aR2 loop quantum cosmology 

    Amorós Torrent, Jaume; De Haro, Jaume; Odintsov, Sergei D. (2014-05-06)
    Article
    Accés obert
    Working in Einstein frame, we introduce, in order to avoid singularities, holonomy corrections to the f(R)=R+aR2 model. We perform a detailed analytical and numerical study when holonomy corrections are taken into account ...
  • Reheating constraints in quintessential inflation 

    Haro Cases, Jaume; Aresté Saló, Llibert (2017-06-02)
    Article
    Accés obert
    We study the consequences of reheating in quintessential inflation. From simple inflationary quintessential models introduced by de Haro, Amorós, and Pan in [Phys. Rev. D 93, 084018 (2016)] and [Phys. Rev. D 94, 064060 ...
  • Reheating in quintessential inflation via gravitational production of heavy massive particles: a detailed analysis 

    Haro Cases, Jaume; Yang, Weiqiang; Pan, Supriya (2019-01-01)
    Article
    Accés obert
    An improved version of the well-known Peebles-Vilenkin model unifying early inflationary era to current cosmic acceleration, is introduced in order to match with the theoretical values of the spectral quantities provided ...
  • Reheating via gravitational particle production in simple models of quintessence or ¿CDM Inflation 

    Haro Cases, Jaume; Aresté Saló, Llibert (2017-11-14)
    Article
    Accés obert
    We have tested some simple CDM (the same test is also valid for quintessence) inflation models, imposing that they match with the recent observational data provided by the BICEP and Planck’s team and leading to a reheating ...
  • Search for high-energy neutrinos from gravitational wave event GW151226 and candidate LVT151012 with ANTARES and IceCube 

    Albert, A.; André, Michel (2017-07-12)
    Article
    Accés obert
    The Advanced LIGO observatories detected gravitational waves from two binary black hole mergers during their first observation run (O1). We present a high-energy neutrino follow-up search for the second gravitational wave ...
  • Simple inflationary quintessential model 

    Haro Cases, Jaume; Amorós Torrent, Jaume; Pan, Supriya (2016-04-12)
    Article
    Accés obert
    In the framework of a flat Friedmann-Lemaitre-Robertson-Walker geometry, we present a nongeodesically past complete model of our Universe without the big bang singularity at finite cosmic time, describing its evolution ...
  • Simple inflationary quintessential model. II. Power law potentials 

    Haro Cases, Jaume; Amorós Torrent, Jaume; Pan, Supriya (American Physical Society, 2016-09-21)
    Article
    Accés obert
    The present work is a sequel of our previous work [Phys. Rev. D 93, 084018 (2016)] which depicted a simple version of an inflationary quintessential model whose inflationary stage was described by a Higgs-type potential ...
  • Study of the singularities in the flat Friedmann-Lemaître-Robertson-Walker Universe 

    Hidalgo Vazquez, Sandra (Universitat Politècnica de Catalunya, 2015-10)
    Projecte Final de Màster Oficial
    Accés obert
    In this project we have performed an study of the singularities in Clasical Cosmology, considering a flat Friedmann-Lemaître-Robertson-Walker for a linear equation of state and for a non-linear one. We have computed ...
  • Tecnociencia cosmológica 

    Barceló Garcia, Miquel (2012-11)
    Article
    Accés obert
  • Teleparallel loop quantum cosmology in a system of intersecting branes 

    Haro Cases, Jaume (Elsevier, 2016-09-10)
    Article
    Accés obert
    Recently, some authors have removed the big bang singularity in teleparallel Loop Quantum Cosmology (LQC) and have shown that the universe may undergo a number of oscillations. We investigate the origin of this type of ...
  • The Dapor–Liegener model of loop quantum cosmology: a dynamical analysis 

    Haro Cases, Jaume (Springer, 2018-11-01)
    Article
    Accés obert
    The Dapor-Liegener model of loop quantum cosmology (LQC), which depicts an emergent universe from a de Sitter regime in the contracting phase is studied from the mathematical viewpoint of dynamical systems and compared ...
  • The matter-ekpyrotic bounce scenario in Loop Quantum Cosmology 

    Haro Cases, Jaume; Amorós Torrent, Jaume; Aresté Saló, Llibert (2017-09-01)
    Article
    Accés obert
    We will perform a detailed study of the matter-ekpyrotic bouncing scenario in Loop Quantum Cosmology using the methods of the dynamical systems theory. We will show that when the background is driven by a single scalar ...
  • The variation of the fine structure constant: testing the dipole model with thermonuclear supernovae 

    Kraiselburd, L; Landau, S. J.; García-Berro Montilla, Enrique; Negrelli, C (2015-05-01)
    Article
    Accés obert
    The large-number hypothesis conjectures that fundamental constants may vary. Accordingly, the space-time variation of fundamental constants has been an active subject of research for decades. Recently, using data obtained ...