Browsing by Author "201-0311640"
Now showing items 1-18 of 18
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(Iop Publishing LTD, 2018-05)We show that a perturbed inflationary spacetime, driven by a canonical single scalar field, is invariant under a special class of coordinate transformations together with a field reparametrization of the curvature ...
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(American Physical Society, 2017)Because of their quantum fluctuations, axion fields had a chance to experience field excursions traversing many minima of their potentials during inflation. We study this situation by analyzing the dynamics of an axion ...
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(Amer Physical Soc, 2015)It was recently shown that a large value of the tensor to scalar ratio r implies a constraint on the minimum value of the sound speed c(s) of primordial curvature perturbations during inflation that is stronger than current ...
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(IOP Publishing Ltd, 2016-09)If cosmic inflation suffered tiny time-dependent deviations from the slow-roll regime, these would induce the existence of small scale-dependent features imprinted in the primordial spectra, with their shapes and sizes ...
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(Universidad de Chile, 2016)Supergravity inflation is considered in the context of the single-field effective field theory for scalar perturbations arising from multiple-field inflation.\\ \\ It is possible to deduce a single-field effective field ...
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(IOP Publishing and Sissa Medialab, 2013)Heavy isocurvature elds may have a strong in uence on the low energy dynamics of curvature perturbations during in ation, as long as the in ationary trajectory becomes non-geodesic in the multi- eld target space (the ...
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(Universidad de Chile, 2013)Un estudio sobre la influencia de campos masivos durante inflación es presentada. Las recientes observaciones, de que estos modos masivos pueden influenciar la evolución de lo modos de curvatura inflacionarios, tiene ...
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(IOP Publishing, 2017-05)Galaxy observations and N-body cosmological simulations produce conflicting dark matter halo density pro files for galaxy central regions. While simulations suggest a cuspy and universal density pro file (UDP) of this ...
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La era inflamatoria del universo en teorias de bigravedad: perspectivas teóricas y observacionales (Universidad de Chile, 2012)Este trabajo representa un primer intento para unir el paradigma inflacionario con teorías de bigravedad. Por una parte, inflación es un período hipotético dentro de la historia del Universo durante del cual el Universo ...
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(Universidad de Chile, 2016)This thesis describes the work that I performed to analyse the data from the Atacama B-mode Search (ABS) experiment. The ABS experiment observed the Cosmic Microwave Background (CMB) radiation for three years using ...
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(American Physical Society, 2020)The inflationary origin of primordial black holes (PBHs) relies on a large enhancement of the power spectrum Delta(zeta) of the curvature fluctuation zeta at wavelengths much shorter than those of the cosmic microwave ...
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(Universidad de Chile, 2016)Cold Dark matter (ΛCDM) models have been remarkably successful to explain the observed large scale structure of our universe on scales of the order of galaxy clusters (≥ 4 Mpc) and above (therefore in this work we consider ...
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(IOP Publishing Ltd., 2017)If time-dependent disruptions from slow-roll occur during inflation, the correlation functions of the primordial curvature perturbation should have scale-dependent features, a case which is marginally supported from the ...
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(American Physical Society (APS), 2020)We present a new class of two-field inflationary attractor models, known as shift-symmetric orbital inflation, whose behavior is strongly multifield but whose predictions are remarkably close to those of single-field ...
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(2016)We study the realization of slow-roll inflation in N = 1 supergravities where inflation is the result of the evolution of a single chiral field. When there is only one flat direction in field space, it is possible to derive ...
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(IOP, 2015)We discuss the possible existence of features in both the primordial power spectrum and bispectrum generated during a stage of single eld cosmic in ation. We argue that there are two main classes of features: those ...
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(IOP Publishing, 2018-05)We study the production of observable primordial local non-Gaussianity in two opposite regimes of canonical single field inflation: attractor (standard single field slow-roll inflation) and non attractor (ultra slow-roll ...
