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Discrepancies between observational data and theoretical forecast in single field slow roll inflation
(2016-09-09)
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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 ...
Simple inflationary quintessential model. II. Power law potentials
(American Physical Society, 2016-09-21)
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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 ...
Matter Bounce Scenario in F(T) gravity
(2016)
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It is shown that teleparallel F(T) theories of gravity combined with holonomy corrected Loop Quantum Cosmology (LQC) support a Matter Bounce Scenario (MBS) which is a potential alternative to the inflationary paradigm. The ...
Qualitative study in loop quantum cosmology
(2017-12-07)
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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 ...
Scaling solutions in quintessential inflation
(springer-Verlag, 2020-05)
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In quintessence scalar field theories, the presence of scaling solutions are important during the radiation and matter epoch due to having their attractor character. Usually, it is assumed that the initial conditions of ...
The Peebles–Vilenkin quintessential inflation model revisited
(springer-Verlag, 2019-06-01)
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We review the well-known Peebles–Vilenkin (PV) quintessential inflation model and discuss its possible improvements in agreement with the recent observations. The improved PV model depends only on two parameters: the ...
Bouncing cosmologies via modified gravity in the ADM formalism: Application to loop quantum cosmology
(American Physical Society (APS), 2018-03-15)
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We consider the Arnowitt-Deser-Misner formalism as a tool to build bouncing cosmologies. In this approach, the foliation of the spacetime has to be fixed in order to go beyond general relativity modifying the gravitational ...
Viability of the matter bounce scenario in F(T) gravity and Loop Quantum Cosmology forgeneral potentials
(2014-12-01)
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We consider the matter bounce scenario in F (T) gravity and Loop Quantum Cosmology (LQC) for phenomenological potentials that at early times provide a nearly matter dominated Universe in the contracting phase, having a ...
Simple inflationary quintessential model
(2016-04-12)
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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 ...
Understanding the phenomenology of interacting dark energy scenarios and their theoretical bounds
(American Physical Society (APS), 2020-06-15)
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Nongravitational interaction between dark matter and dark energy has been considered in a spatially flat Friedmann-Lemaître-Robertson-Walker (FLRW) universe. The interaction rate is assumed to be linear in the energy ...