CMB anisotropies in the presence of extra dimensions

Rhodes, C. S.; Bruck, Carsten van de; Brax, Ph.; Davis, Anne-Christine

doi:10.1103/physrevd.68.083511

Cited by 37 publications

(38 citation statements)

References 49 publications

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“…Finally we note that braneworld effects on the evolution of perturbations after the second Hubble radius crossing can potentially leave signatures on the temperature anisotropies in CMB, but the techniques for calculating these signatures are still under development [209,317]. While it is generally complicated to fully solve the perturbation equations in a higher-dimensional bulk coupled to matter perturbations on the brane [53,194,208,210,282,378], it is of great interest to see how the effect of five-dimensional gravity affects the CMB power spectra by solving the bulk geometry consistently.…”

Section: A Braneworldmentioning

confidence: 99%

Inflation dynamics and reheating

Bassett¹,

Tsujikawa²,

Wands³

2006

Rev. Mod. Phys.

1,007

1,329

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We review the theory of inflation with single and multiple fields paying particular attention to the dynamics of adiabatic and entropy/isocurvature perturbations which provide the primary means of testing inflationary models. We review the theory and phenomenology of reheating and preheating after inflation providing a unified discussion of both the gravitational and nongravitational features of multi-field inflation. In addition we cover inflation in theories with extra dimensions and models such as the curvaton scenario and modulated reheating which provide alternative ways of generating large-scale density perturbations. Finally we discuss the interesting observational implications that can result from adiabatic-isocurvature correlations and non-Gaussianity.

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Section: A Braneworldmentioning

confidence: 99%

Inflation dynamics and reheating

Bassett¹,

Tsujikawa²,

Wands³

2006

Rev. Mod. Phys.

1,007

1,329

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“…A possible common origin of DM and DE and/or their direct coupling (Wetterich 1995;Amendola 1999;Gasperini et al 2002;Bartolo & Pietroni 2000;Chimento et al 2003;Rhodes et al 2003;Farrar & Peebles 2004) would ease one of the most critical problems in modern cosmology, the so-called coincidence problem: why did expansion started to accelerate just at the eve of our cosmic epoch, after decelerating during all epochs after inflation? Why do DE and DM have similar densities just now?…”

Section: Introductionmentioning

confidence: 99%

Isw-LSS Cross-Correlation in Coupled Dark Energy Models With Massive Neutrinos

Mainini

Mota

2011

ApJ

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We provide an exhaustive analysis of the Integrated Sachs-Wolfe (ISW) effect in the context of coupled dark energy cosmologies where a component of massive neutrinos is also present. We focus on the effects of both the coupling between dark matter and dark energy and of the neutrino mass on the cross-correlation between galaxy/quasar distributions and ISW effect. We provide a simple expression to appropriately rescale the galaxy bias when comparing different cosmologies. Theoretical predictions of the cross-correlation function are then compared with observational data. We find that, while it is not possible to distinguish among the models at low redshifts, discrepancies between coupled models and ΛCDM increase with z. In spite of this, current data alone does not seem able to distinguish between coupled models and ΛCDM. However, we show that upcoming galaxy surveys will permit tomographic analysis that will allow us to better discriminate among the models. We discuss the effects on cross-correlation measurements of ignoring galaxy bias evolution, b(z), and magnification bias correction and provide fitting formulae for b(z) for the cosmologies considered. We compare three different tomographic schemes and investigate how the expected signal-to-noise ratio, S/N, of the ISW-LSS cross-correlation changes when increasing the number of tomographic bins. The dependence of S/N on the area of the survey and the survey shot noise is also discussed.

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“…One should note that our results refer to the initial scalar and tensor perturbation spectra and not to the braneworld effects on the subsequent evolution of the perturbations that is likely to be model dependent (Leong et al 2002;Rhodes et al 2003).…”

Section: Discussionmentioning

confidence: 99%

FROMWMAPTOPLANCK: EXACT RECONSTRUCTION OF FOUR- AND FIVE-DIMENSIONAL INFLATIONARY POTENTIAL FROM HIGH-PRECISION COSMIC MICROWAVE BACKGROUND MEASUREMENTS

Popa

Mandolesi

Caramete

et al. 2009

ApJ

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We make a more general determination of the inflationary observables in the standard four-dimensional (4D) and five-dimensional (5D) single-field inflationary scenarios by the exact reconstruction of the dynamics of the inflation potential during the observable inflation with a minimal number of assumptions: the computation does not assume the slow-roll approximation and is valid in all regimes if the field is monotonically rolling down its potential. We address higher order effects in the standard and braneworld single-field inflation scenarios by fitting the Hubbble expansion rate and subsequently the inflationary potential directly to WMAP5+SN+BAO and Planck-like simulated data sets. Making use of the Hamilton-Jacobi formalism developed for the 5D single-field inflation model, we compute the scale dependence of the amplitudes of the scalar and tensor perturbations by integrating the exact mode equation. The solutions in 4D and 5D inflation scenarios differ through the dynamics of the background scalar field and the number of e-folds assumed to be compatible with the observational window of inflation. We analyze the implications of the theoretical uncertainty in the determination of the reheating temperature after inflation on the observable predictions of inflation and evaluate its impact on the degeneracy of the standard inflation consistency relation. We find that the detection of tensor perturbations and the theoretical uncertainties in the inflationary observable represents a significant challenge for the future Planck cosmic microwave background measurements: distinguishing between the observational signatures of the standard and braneworld single-field inflation scenarios. This work has been done in the frame of Planck Core Team activities.

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CMB anisotropies in the presence of extra dimensions

Cited by 37 publications

References 49 publications

Inflation dynamics and reheating

Inflation dynamics and reheating

Isw-LSS Cross-Correlation in Coupled Dark Energy Models With Massive Neutrinos

FROMWMAPTOPLANCK: EXACT RECONSTRUCTION OF FOUR- AND FIVE-DIMENSIONAL INFLATIONARY POTENTIAL FROM HIGH-PRECISION COSMIC MICROWAVE BACKGROUND MEASUREMENTS

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