Nonperturbative instabilities as a solution of the cosmological moduli problem

Shuhmaher, Natalia; Brandenberger, Robert H.

doi:10.1103/physrevd.73.043519

Cited by 39 publications

(44 citation statements)

References 33 publications

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“…1 in [38]). Hence, the model of emerging brane inflation of [15] passes this first observational test.…”

Section: A Cosmological Parametersmentioning

confidence: 99%

“…where we only kept the leading order term in (65). Hence, we naively expect that the expansion of the universe and the redshifting of the potential lead to comparable effects.…”

Section: B Pre-heatingmentioning

confidence: 99%

“…On the other hand, the preceding expansion phase sets an upper limit on the scale factor b [15]. The end of bulk expansion and the beginning of inflation is indicated by V = ρ b where ρ b is the energy density of the brane gas.…”

Section: B Estimate Of the Fundamental String Lengthmentioning

confidence: 99%

“…In this article, we would like to discuss the recent proposal of emerging brane inflation [15,16] that makes use of extra dimensions, a gas of p-branes in the bulk to drive an initial isotropic but non accelerated expansion of the universe, as well as orbifold fixed planes responsible for contraction of the extra dimensions and inflation of our three dimensions. The presence of a string gas at the end of inflation provides a graceful exit, pre-heating and stabilization of extra dimensions.…”

Section: Introductionmentioning

confidence: 99%

“…The pre-inflationary expansion [15,16] is governed by topological defects (p-branes) in the bulk and responsible for a large inter brane separation. As the universe expands isotropically due to the gas of p-branes, the energy density stored in the gas gets diluted until additional weak forces come into play, changing the overall dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Predictions of dynamically emerging brane inflation models

Battefeld¹,

Shuhmaher²

2006

Phys. Rev. D

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We confront the recent proposal of Emerging Brane Inflation with WMAP3+SDSS, finding a scalar spectral index of ns = 0.9659 +0.0049 −0.0052 in excellent agreement with observations. The proposal incorporates a preceding phase of isotropic, non accelerated expansion in all dimensions, providing suitable initial conditions for inflation. Additional observational constraints on the parameters of the model provide an estimate of the string scale.A graceful exit to inflation and stabilization of extra dimensions is achieved via a string gas. The resulting pre-heating phase shows some novel features due to a redshifting potential, comparable to effects due to the expansion of the universe itself. However, the model at hand suffers from either a potential over-production of relics after inflation or insufficient stabilization at late times.

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“…1 in [38]). Hence, the model of emerging brane inflation of [15] passes this first observational test.…”

Section: A Cosmological Parametersmentioning

confidence: 99%

“…where we only kept the leading order term in (65). Hence, we naively expect that the expansion of the universe and the redshifting of the potential lead to comparable effects.…”

Section: B Pre-heatingmentioning

confidence: 99%

Section: B Estimate Of the Fundamental String Lengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Predictions of dynamically emerging brane inflation models

Battefeld¹,

Shuhmaher²

2006

Phys. Rev. D

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The confining heterotic brane gas: a non-inflationary solution to the entropy and horizon problems of standard cosmology

Brandenberger

Shuhmaher

2006

J. High Energy Phys.

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We propose a mechanism for solving the horizon and entropy problems of standard cosmology which does not make use of cosmological inflation. Crucial ingredients of our scenario are brane gases, extra dimensions, and a confining potential due to string gas effects which becomes dominant at string-scale brane separations. The initial conditions are taken to be a statistically homogeneous and isotropic hot brane gas in a space in which all spatial dimensions are of string scale. The extra dimensions which end up as the internal ones are orbifolded. The hot brane gas leads to an initial phase (Phase 1) of isotropic expansion. Once the bulk energy density has decreased sufficiently, a weak confining potential between the two orbifold fixed planes begins to dominate, leading to a contraction of the extra spatial dimensions (Phase 2). String modes which contain momentum about the dimensions perpendicular to the orbifold fixed planes provide a repulsive potential which prevents the two orbifold fixed planes from colliding. The radii of the extra dimensions stabilize, and thereafter our three spatial dimensions expand as in standard cosmology. The energy density after the stabilization of the extra dimensions is of string scale, whereas the spatial volume has greatly increased during Phases 1 and 2, thus leading to a non-inflationary solution of the horizon and entropy problems.

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Reheating in a brane monodromy inflation model

Brandenberger¹,

Knauf²,

Lorenz³

2008

J. High Energy Phys.

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We study reheating in a recently proposed brane "monodromy inflation" model in which the inflaton is the position of a D4 brane on a "twisted torus". Specifically, we study the repeated collisions between the D4 brane and a D6 brane (on which the Standard Model fields are assumed to be localized) at a fixed position along the monodromy direction as the D4 brane rolls down its potential. We find that there is no trapping of the rolling D4 brane until it reaches the bottom of its potential, and that reheating is entirely described by the last brane encounter. Previous collisions have negligible effect on the brane velocity and hence on the reheat temperature. In the context of our setup, reheating is efficient and the reheat temperature is therefore high.

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Nonperturbative instabilities as a solution of the cosmological moduli problem

Cited by 39 publications

References 33 publications

Predictions of dynamically emerging brane inflation models

Predictions of dynamically emerging brane inflation models

The confining heterotic brane gas: a non-inflationary solution to the entropy and horizon problems of standard cosmology

Reheating in a brane monodromy inflation model

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