Now showing items 1-12 of 92

    • Cosmology intertwined: a review of the particle physics, astrophysics, and cosmology associated with the cosmological tensions and anomalies 

      Abdalla, Elcio; Abellan, Guillermo Franco; Aboubrahim, Amin; Agnello, Adriano; Akarsu, Özgür; Akrami, Yashar; Alestas, George; Aloni, Daniel; Amendola, Luca; Anchordoqui, Luis A.; Haro Cases, Jaume (2022-06)
      Article
      Open Access
      The standard ¿ Cold Dark Matter (¿CDM) cosmological model provides a good description of a wide range of astrophysical and cosmological data. However, there are a few big open questions that make the standard model look ...
    • Topics in cosmology — clearly explained by means of simple examples 

      Haro Cases, Jaume; Elizalde Rius, Emilio (2022-03)
      Article
      Open Access
      This is a very comprehensible review of some key issues in modern cosmology. Simple mathematical examples and analogies are used, whenever available. The starting point is the well-known Big Bang cosmology (BBC). We deal ...
    • Understanding gravitational particle production in quintessential inflation 

      Haro Cases, Jaume; Pan, Supriya; Aresté Saló, Llibert (2019-06-01)
      Article
      Open Access
      The diagonalization method, introduced by a group of Russian scientists at the beginning of seventies, is used to compute the energy density of superheavy massive particles produced due to a sudden phase transition from ...
    • A review of quintessential inflation 

      Haro Cases, Jaume; Aresté Saló, Llibert (2021-12)
      Article
      Open Access
      Some of the most important quintessential inflation scenarios, such as the Peebles–Vilenkin model, are described in detail. These models are able to explain the early- and late-time accelerated expansions of our universe, ...
    • Pointwise monotonicity of heat kernels 

      Alonso Orán, Diego; Chamizo, Fernando; Martínez Martínez, Ángel David; Mas Blesa, Albert (Springer, 2021-12-13)
      Article
      Restricted access - publisher's policy
      In this paper we present an elementary proof of a pointwise radial monotonicity property of heat kernels that is shared by the Euclidean spaces, spheres and hyperbolic spaces. The main result was discovered by Cheeger and ...
    • Quintessential inflation and cosmological seesaw mechanism: reheating and observational constraints 

      Aresté Saló, Llibert; Benistry, David; Guendelman, Eduardo I.; Haro Cases, Jaume (2021-07)
      Article
      Open Access
      Recently a new kind of quintessential inflation coming from the Lorentzian distribution has been introduced in [1,2]. The model leads to a very simple potential, which basically depends on two parameters, belonging to the ...
    • Discrepancy of minimal riesz energy points 

      Mas Blesa, Albert; Marzo Sánchez, Jordi (Springer Nature, 2021-04-08)
      Article
      Open Access
      We find upper bounds for the spherical cap discrepancy of the set of minimizers of the Riesz s-energy on the sphere Sd. Our results are based on bounds for a Sobolev discrepancy introduced by Thomas Wolff in an unpublished ...
    • a-attractors in quintessential inflation motivated by supergravity 

      Aresté Saló, Llibert; Benistry, David; Guendelman, Eduardo I.; Haro Cases, Jaume (American Physical Society, 2021-06-15)
      Article
      Open Access
      An exponential kind of quintessential inflation potential motivated by supergravity is studied. This type belongs to the class of a-attractor models. The model was studied for the first time by Dimopoulos and Owen in [J. ...
    • Theoretical and observational bounds on some interacting vacuum energy scenarios 

      Yang, Weiqiang; Pan, Supriya; Aresté Saló, Llibert; Haro Cases, Jaume (American Physical Society, 2021-04-15)
      Article
      Open Access
      The dynamics of interacting dark matter-dark energy models is characterized through an interaction rate function quantifying the energy flow between these dark sectors. In most of the interaction functions, the expansion ...
    • Near-sphere lattices with constant nonlocal mean curvature 

      Cabré Vilagut, Xavier; Fall, Mouhamed Moustapha; Weth, Tobias (2018-04)
      Article
      Open Access
      We are concerned with unbounded sets of RN whose boundary has constant nonlocal (or fractional) mean curvature, which we call CNMC sets. This is the equation associated to critical points of the fractional perimeter ...
    • Discrepancies between observational data and theoretical forecast in single field slow roll inflation 

      Amorós Torrent, Jaume; Haro Cases, Jaume (2016-09-09)
      Article
      Open Access
      The PLANCK collaboration has determined, or greatly constrained, values for the spectral parameters of the CMB radiation, namely the spectral index ns, its running as, the running of the running ßs, using a growing body ...
    • Optimal regularity of stable solutions to nonlinear equations involving the p-Laplacian 

      Cabré Vilagut, Xavier; Miraglio, Pietro; Sanchón Rodellar, Manuel (2020-01-01)
      Article
      Open Access
      We consider the equation-¿pu=f(u)in a smooth bounded domain ofRn, where¿pis thep-Laplaceoperator. Explicit examples of unbounded stable energy solutions are known ifn=p+4pp-1. Instead, whenn<p+4pp-1, stable solutions have ...