Browsing by Author "Aresté Saló, Llibert"
Now showing items 118 of 18

A review of quintessential inflation
Haro Cases, Jaume; Aresté Saló, Llibert (202112)
Article
Open AccessSome 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 latetime accelerated expansions of our universe, ... 
aattractors in quintessential inflation motivated by supergravity
Aresté Saló, Llibert; Benistry, David; Guendelman, Eduardo I.; Haro Cases, Jaume (American Physical Society, 20210615)
Article
Open AccessAn exponential kind of quintessential inflation potential motivated by supergravity is studied. This type belongs to the class of aattractor models. The model was studied for the first time by Dimopoulos and Owen in [J. ... 
Analytic formula to calculate the reheating temperature via gravitational particle production in smooth nonoscillating backgrounds
Haro Cases, Jaume; Aresté Saló, Llibert (American Physical Society, 20230315)
Article
Open AccessWe present for smooth nonoscillating backgrounds an analytic formula which calculates the energy density of massive and massless particles created via gravitational particle production, thus giving the corresponding reheating ... 
Cosmological perturbations in a class of fully covariant modified theories: application to models with the same background as standard LQC
Haro Cases, Jaume; Aresté Saló, Llibert; Elizalde, Emilio (Springer, 20180901)
Article
Open AccessBouncing cosmologies are obtained by adding to the Einstein–Hilbert action a term of the form gvf(¿), with ¿ a scalar depending on the Hubble parameter only, not on its derivatives, and which is here shown to arise ... 
Cosmological solutions in spatially curved universes with adiabatic particle production
Aresté Saló, Llibert; Haro Cases, Jaume (20170220)
Article
Open AccessWe perform a qualitative and thermodynamic study of two models when one takes into account adiabatic particle production. In the first one, there is a constant particle production rate, which leads to solutions depicting ... 
Limiting curvature mimetic gravity and its relation to Loop Quantum Cosmology
Haro Cases, Jaume; Aresté Saló, Llibert; Pan, Supriya (20190401)
Article
Open AccessConsidering as usual that the underlying geometry of our universe is well described by the spatially flat Friedmann–Lemaître–Robertson–Walker line element, we review how the background of holonomy corrected Loop Quantum ... 
Note on the reheating temperature in Starobinskytype potentials
Haro Cases, Jaume; Aresté Saló, Llibert (Springer Nature, 202012)
Article
Open AccessThe relation between the reheating temperature, the number of efolds and the spectral index is shown for the Starobinsky model and some of its descendants through a very detailed calculation of these three quantities. The ... 
Qualitative study in loop quantum cosmology
Aresté Saló, Llibert; Amorós Torrent, Jaume; Haro Cases, Jaume (20171207)
Article
Open AccessThis 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 and cosmological seesaw mechanism: reheating and observational constraints
Aresté Saló, Llibert; Benistry, David; Guendelman, Eduardo I.; Haro Cases, Jaume (202107)
Article
Open AccessRecently 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 ... 
Quintessential inflation at low reheating temperatures
Aresté Saló, Llibert; Haro Cases, Jaume (20171123)
Article
Open AccessWe 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 ... 
Quintessential inflation for exponential type potentials: scaling and tracker behavior
Aresté Saló, Llibert; Haro Cases, Jaume (springerVerlag, 202102)
Article
Open AccessWe will show that for exponential type potentials of the form V(f)~e¿fn/Mnpl, which are used to depict quintessential inflation, the solutions whose initial conditions take place during the slow roll phase in order to ... 
Reheating constraints in quintessential inflation
Haro Cases, Jaume; Aresté Saló, Llibert (20170602)
Article
Open AccessWe 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 via gravitational particle production in simple models of quintessence or ¿CDM Inflation
Haro Cases, Jaume; Aresté Saló, Llibert (20171114)
Article
Open AccessWe 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 ... 
Singularities and qualitative study in LQC
Aresté Saló, Llibert (Universitat Politècnica de Catalunya, 201701)
Bachelor thesis
Open AccessWe will perform a detailed analysis of singularities in Einstein Cosmology and in LQC (Loop Quantum Cosmology). We will obtain explicit analytical expressions for the energy density and the Hubble constant for a given set ... 
The matterekpyrotic bounce scenario in Loop Quantum Cosmology
Haro Cases, Jaume; Amorós Torrent, Jaume; Aresté Saló, Llibert (20170901)
Article
Open AccessWe will perform a detailed study of the matterekpyrotic 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 spectrum of gravitational waves, their overproduction in quintessential inflation and its influence in the reheating temperature
Haro Cases, Jaume; Aresté Saló, Llibert (20200601)
Article
Open AccessOne of the most important issues in an inflationary theory as standard or quintessential inflation is the mechanism to reheat the universe after the end of the inflationary period in order to match with the Hot Big Bang ... 
Theoretical and observational bounds on some interacting vacuum energy scenarios
Yang, Weiqiang; Pan, Supriya; Aresté Saló, Llibert; Haro Cases, Jaume (American Physical Society, 20210415)
Article
Open AccessThe dynamics of interacting dark matterdark 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 ... 
Understanding gravitational particle production in quintessential inflation
Haro Cases, Jaume; Pan, Supriya; Aresté Saló, Llibert (20190601)
Article
Open AccessThe 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 ...