Now showing items 21-40 of 48

  • Inflation and late-time acceleration from a double-well potential with cosmological constant 

    Haro Cases, Jaume; Elizalde, Emilio (2016-06-01)
    Article
    Open Access
    A model of a universe without big bang singularity is presented, which displays an early inflationary period ending just before a phase transition to a kination epoch. The model produces enough heavy particles so as to ...
  • La eterna historia 

    Barceló Garcia, Miquel (1995-12)
    Article
    Open Access
  • Modelos cosmológicos en el marco de la teoría general de la relatividad 

    Ribera Manzano, Pablo (Universitat Politècnica de Catalunya, 2016-06-29)
    Bachelor thesis
    Open Access
    Detailed work about relativistic cosmology: exposition of the principles and postulates, description of the geometry of spacetime and its matter contents, Hubble's law from a relativistic point of view, analysis of the ...
  • Non-extensive statistics to the cosmological lithium problem 

    Hou, S.Q.; He, J.J.; Parikh, Anuj Ramesh (2017-01-11)
    Article
    Open Access
    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
    Open Access
    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
    Open Access
    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)
    External research report
    Open Access
    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
    Open Access
    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)
    Book
    Open Access
  • Qualitative study in loop quantum cosmology 

    Aresté Saló, Llibert; Amorós Torrent, Jaume; Haro Cases, Jaume (2017-12-07)
    Article
    Restricted access - publisher's policy
    This work contains a detailed qualitative analysis, in general relativity and in loop quantum cosmology, of the dynamics in the associated phase space of a scalar field minimally coupled with gravity, whose potential mimics ...
  • Quintessential inflation at low reheating temperatures 

    Aresté Saló, Llibert; Haro Cases, Jaume (2017-11-23)
    Article
    Open Access
    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
    Open Access
    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
    Open Access
    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
    Open Access
    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
    Open Access
    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
    Open Access
    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
    Open Access
    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
    Open Access
    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)
    Master thesis
    Open Access
    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
    Open Access