An Alternative to Compactification

Randall, Lisa; Sundrum, Raman

doi:10.1103/physrevlett.83.4690

Cited by 7,050 publications

(10,251 citation statements)

References 12 publications

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“…(7) and (8) are evaluated at Hubble radius crossing, k = aH (here k is the comoving wavenumber). Defining the spectral indices of scalar and tensor perturbations as…”

Section: Formalismmentioning

confidence: 99%

“…It is now possible also to impose observational constraints on inflation in non-standard cosmologies, the archetypal example being the braneworld cosmology, and in particular the Randall-Sundrum Type II model (RSII) [8] which is the one most investigated in the literature. While it has been shown that observations of the primordial spectra cannot distinguish between the standard cosmology and the braneworld [9], specific constraints on the potential driving inflation will be different between those scenarios.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Constraints on braneworld inflation from CMB anisotropies

Tsujikawa¹,

Liddle²

2004

J. Cosmol. Astropart. Phys.

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We obtain observational constraints on Randall-Sundrum type II braneworld inflation using a compilation of data including WMAP, the 2dF and latest SDSS galaxy redshift surveys. We place constraints on three classes of inflation models (large-field, small-field and hybrid models) in the high-energy regime, which exhibit different behaviour compared to the low-energy case. The quartic potential is outside the 2σ observational contour bound for a number of e-folds less than 60, and steep inflation driven by an exponential potential is excluded because of its high tensor-to-scalar ratio. It is more difficult to strongly constrain small-field and hybrid models due to additional freedoms associated with the potentials, but we obtain upper bounds for the energy scale of inflation and the model parameters in certain cases. We also discuss possible ways to break the degeneracy of consistency relations and inflationary observables.

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“…(7) and (8) are evaluated at Hubble radius crossing, k = aH (here k is the comoving wavenumber). Defining the spectral indices of scalar and tensor perturbations as…”

Section: Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constraints on braneworld inflation from CMB anisotropies

Tsujikawa¹,

Liddle²

2004

J. Cosmol. Astropart. Phys.

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“…The induced metric on the brane is denoted by γ ab . With the last term in the action (2.1), we have allowed for the contribution of extra field degrees of freedom which are confined to the brane, e.g., the Standard Model fields in a RS2 scenario [3].…”

Section: Construction Of a Bouncing Braneworldmentioning

confidence: 99%

“…Braneworlds [1,2,3] have generated enormous interest in higher-dimensional spacetimes amongst particle theorists. A key ingredient in these brane models is that the Standard Model particles remain confined to a (3+1)-dimensonal brane, while only the gravitational excitations propagate through the full spacetime.…”

Section: Introductionmentioning

confidence: 99%

Bouncing braneworlds go crunch!

Hovdebo¹,

Myers²

2003

J. Cosmol. Astropart. Phys.

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Recently, interesting braneworld cosmologies in the Randall-Sundrum scenario have been constructed using a bulk spacetime which corresponds to a charged AdS black hole. In particular, these solutions appear to 'bounce', making a smooth transition from a contracting to an expanding phase. By considering the spacetime geometry more carefully, we demonstrate that generically in these solutions the brane will encounter a singularity in the transition region.

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“…As solutions of gauged supergravity these are conjectured to be dual to the Renormalization Group (RG) flows of field theory couplings [7,8,9,10,11,12,13]. Domain Walls are also a key ingredient of Brane world construction [14,15,16,17,18,19]. More recently, in four dimensions, these solitons have been used as a laboratory for the comprehension of mirror symmetry in flux/generalized geometry compactifications [20,21,22] and to explore transitions between the different cosmological vacua of the Landscape [23].…”

Section: Introductionmentioning

confidence: 99%

Null deformed domain wall

Celi

2007

J. High Energy Phys.

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We study null 1/4 BPS deformations of flat Domain Wall solutions (NDDW) in N = 2, d = 5 gauged supergravity with hypermultiplets and vector multiplets coupled. These are uncharged timedependent configurations and contain as special case, 1/2 supersymmetric flat domain walls (DW) and, as well, 1/2 BPS null solutions of the ungauged supergravity. Combining our analysis with the classification method initiated by Gauntlett et al., we prove that all the possible deformations of the DW have origin in the hypermultiplet sector or/and are null. Here, we classify all the null deformations: we show that they naturally organize in "gauging" (v-deformation) and "non gauging" (u-deformation). They have different properties: only in presence of v-deformation the solution is supported by a timedependent scalar potential. Furthermore we show that u-deformation forces the number of multiplets coupled to be different by one. We discuss the general procedure for constructing explicit solutions, stressing the crucial role taken by the integrability conditions of the scalars as spacetime functions. Two analytical solutions are presented. Finally, we comment on the holographic applications of NDDW, in relation with the recently proposed timedependent AdS/CFT.

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An Alternative to Compactification

Cited by 7,050 publications

References 12 publications

Constraints on braneworld inflation from CMB anisotropies

Constraints on braneworld inflation from CMB anisotropies

Bouncing braneworlds go crunch!

Null deformed domain wall

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