Induced gravity in orientifold models

Kohlprath, Emmanuel

doi:10.1016/j.nuclphysb.2004.06.040

Cited by 23 publications

(41 citation statements)

References 29 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter can take an arbitrary value below M Pl . This opens a window for a possible string theory realization of this model, or its D > 5 counterparts [5,7] (for earlier proposals see [51,52]). …”

Section: Cosmologymentioning

confidence: 85%

Cargèse Lectures on Brane Induced Gravity

Gabadadze

2007

Nuclear Physics B - Proceedings Supplements

View full text Add to dashboard Cite

A brief introduction is given to the subject of brane induced gravity. The 5D example is discussed in detail. The 4D laws of gravity are obtained on a brane embedded in an infinite volume extra space, where the problem of stabilization of the volume modulus is absent. The theory has two classically disjoint branches of solutions -the conventional and self-accelerated one. The conventional branch is perturbatively stable, and gives rise to predictions that are potentially measurable within the Solar system. The self-accelerated branch, on the other hand, provides an existence proof for an idea that the accelerated expansion of the Universe could be due to modified gravity. This branch, however, exhibits negative mass states, suggesting that the self-accelerated solution may not be free of instabilities. A proposal to overcome this difficulty in an extension of the original model, that also allows for the quantum gravity scale to be unrestricted, is discussed.

show abstract

Section: Cosmologymentioning

confidence: 85%

Cargèse Lectures on Brane Induced Gravity

Gabadadze

2007

Nuclear Physics B - Proceedings Supplements

View full text Add to dashboard Cite

show abstract

“…However, in type II theory and orientifolds thereof there is a 1-loop correction to this which we denoted by δ E in (2.4), cf. also [15,16,17,18,19]. Then one can reach the action in Einstein frame (called the "1-loop corrected Einstein frame" in [16]) by performing a Weyl-rescaling 5) where g µν denotes the metric appearing in (2.4).…”

Section: Calculational Setupmentioning

confidence: 99%

“…Building on earlier work, i.e. [18] and in particular [19] which generalized the method of [15] to the N = 1 case, we derived the corrections to the Einstein-Hilbert term for the Z 6 -orientifold (as well as the Z 3 -orientifold). We find 16) where the term proportional to the Euler number χ arise from the torus, while the Cl 2 -term arises from the N = 1 sectors of A , M and K and the E 2 -terms are the contributions of the N = 2 sectors of A , M and K .…”

Section: Pos(corfu2016)099mentioning

confidence: 99%

Towards the 1-loop effective action of type IIB orientifolds

Haack¹,

Kang²

2017

Proceedings of Corfu Summer Institute 2016 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2016)

View full text Add to dashboard Cite

show abstract

“…In the simplest example, the DGP model [1], the brane tension V and bulk cosmological constant Λ are neglected. Specific examples with an induced gravity term can be obtained in string theory, and are common in holographic descriptions [2,3,4,5]. Despite possible problems at large distances [6], the DGP model predicts an interesting cosmological evolution [7].…”

Section: Introductionmentioning

confidence: 99%

Late acceleration andw=−1crossing in induced gravity

Apostolopoulos

Tetradis

2006

Phys. Rev. D

View full text Add to dashboard Cite

We study the cosmological evolution on a brane with induced gravity within a bulk with arbitrary matter content. We consider a Friedmann-Robertson-Walker brane, invariantly characterized by a six-dimensional group of isometries. We derive the effective Friedmann and Raychaudhuri equations. We show that the Hubble expansion rate on the brane depends on the covariantly defined integrated mass in the bulk, which determines the energy density of the generalized dark radiation. The Friedmann equation has two branches, distinguished by the two possible values of the parameter ǫ = ±1. The branch with ǫ = 1 is characterized by an effective cosmological constant and accelerated expansion for low energy densities. Another remarkable feature is that the contribution from the generalized dark radiation appears with a negative sign. As a result, the presence of the bulk corresponds to an effective negative energy density on the brane, without violation of the weak energy condition. The transition from a period of domination of the matter energy density by nonrelativistic brane matter to domination by the generalized dark radiation corresponds to a crossing of the phantom divide w = −1.

show abstract

Induced gravity in orientifold models

Cited by 23 publications

References 29 publications

Cargèse Lectures on Brane Induced Gravity

Cargèse Lectures on Brane Induced Gravity

Towards the 1-loop effective action of type IIB orientifolds

Late acceleration andw=−1crossing in induced gravity

Contact Info

Product

Resources

About