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Exploring the superimposed oscillations parameter space
 JCAP 0501 (2005) 007, [hepph/0405249
"... The space of parameters characterizing an inflationary primordial power spectrum with small superimposed oscillations is explored using Monte Carlo methods. The most interesting region corresponding to high frequency oscillations is included in the analysis. The oscillations originate from some new ..."
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Cited by 16 (4 self)
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The space of parameters characterizing an inflationary primordial power spectrum with small superimposed oscillations is explored using Monte Carlo methods. The most interesting region corresponding to high frequency oscillations is included in the analysis. The oscillations originate from some new physics taking place at the beginning of the inflationary phase and characterized by the new energy scale Mc. It is found that the standard slowroll model remains the most probable one given the first year WMAP data. At the same time, the oscillatory models better fit the data on average, which is consistent with previous works on the subject. This is typical of a situation where volume effects in the parameter space play a significant role. Then, we find the amplitude of the oscillations to be less than 22 % of the mean amplitude and the new scale Mc to be such that H/Mc < 6.6 × 10 −4 at 1σ level, where H is the scale of inflation. PACS numbers: 98.80.Cq, 98.70.VcExploring the Superimposed Oscillations Parameter Space 2 1.
Magnetogenesis and the primordial nongaussianity
, 810
"... Abstract. The primordial density fluctuation inevitably couples to all forms of matter via loop corrections and depends on the ambient conditions while inflation was ongoing. This gives us an opportunity to observe processes which were in progress while the universe was inflating, provided they were ..."
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Cited by 10 (4 self)
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Abstract. The primordial density fluctuation inevitably couples to all forms of matter via loop corrections and depends on the ambient conditions while inflation was ongoing. This gives us an opportunity to observe processes which were in progress while the universe was inflating, provided they were sufficiently dramatic to overcome suppression by powers of (H/MP) 2 ≈ 10 −9, where H is the Hubble scale during inflation and MP is the Planck mass. As an example, if a primordial magnetic field was synthesized during inflation, as suggested by some interpretations of the apparently universal 10 −6 gauss field observed on galactic scales, then this could leave traces in inflationary observables. In this paper, I compute corrections to the spectrum and bispectrum generated by a varying electromagnetic coupling during inflation, assuming that the variation in this coupling is mediated by interaction with a collection of light scalar fields. If the mass scale associated with this interaction is too far below the Planck scale then the stability of perturbation theory can be upset. For the massscale which is relevant in the standard magnetogenesis scenario, however, the theory is stable and the model is apparently consistent with observational constraints.
Nonperturbative black holes in TypeIIA String Theory vs. the NoHair conjecture
"... We obtain the first black hole solution to TypeIIA String Theory compactified on an arbitrary selfmirror Calabi Yau manifold in the presence of nonperturbative quantum corrections. Remarkably enough, the solution involves multivalued functions, which could lead to a violation of the NoHair conj ..."
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Cited by 4 (2 self)
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We obtain the first black hole solution to TypeIIA String Theory compactified on an arbitrary selfmirror Calabi Yau manifold in the presence of nonperturbative quantum corrections. Remarkably enough, the solution involves multivalued functions, which could lead to a violation of the NoHair conjecture. We discuss how String Theory forbids such secenario. However the possibility still remains open in the context of fourdimensional ungauged Supergravity.
On Inflation with the Generalized Uncertainty Principle
, 810
"... Abstract: In this paper we revisit the formulation of scalar field theories on de Sitter backgrounds subject to the generalized uncertainty principle (GUP). The GUP arises in several contexts in string theory, but is most readily thought of as resulting from using strings as effective probes of geom ..."
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Abstract: In this paper we revisit the formulation of scalar field theories on de Sitter backgrounds subject to the generalized uncertainty principle (GUP). The GUP arises in several contexts in string theory, but is most readily thought of as resulting from using strings as effective probes of geometry, which suggests an uncertainty relation incorporating the string scale ls. After reviewing the string theoretic case for the GUP, which implies a minimum length scale ls, we follow in the footsteps of Kempf and concern ourselves as to how one might write down field theories which respect the GUP. We uncover a new representation of the GUP, which unlike previous studies, readily permits analytical solutions for the mode functions of a scalar field on de Sitter backgrounds. We find that scalar fields cannot be quantized on inflationary backgrounds with a Hubble radius H −1 smaller than the string scale, implying a potential subplanckian cutoff on the scale of inflation resulting from the GUP. We also compute order (Hls) 2 (as opposed to (Hlpl) 2) corrections to the two point correlation function and comment on the future prospects of observing such corrections in the event our universe is described by a weakly coupled string theory. Contents
unknown title
, 2013
"... Agujeros negros cuánticos en la teoría de cuerdas tipoIIA Memoria de trabajo presentada por Pablo Bueno Gómez para optar al título de Máster en Física Teórica por la ..."
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Agujeros negros cuánticos en la teoría de cuerdas tipoIIA Memoria de trabajo presentada por Pablo Bueno Gómez para optar al título de Máster en Física Teórica por la