Brane-world inflation without inflaton on the brane

Himemoto, Y.; Sasaki, Misao

doi:10.1103/physrevd.63.044015

Cited by 108 publications

(159 citation statements)

References 42 publications

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“…Inflation on the brane has been considered in the literature (see for example [10][11][12][13]), and even the tendency of the brane embedded into AdS bulk to dissipate anisotropy was reported [14,15], but it is not perfectly clear what would happen if the bulk itself was anisotropic (or non-homogeneous, for that matter). Would inflation on the brane be enough to isotropize both the brane and the bulk (which has much larger volume), or would some sort of "bulk inflation" be needed?…”

Section: Discussionmentioning

confidence: 99%

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Kasner–AdS spacetime and anisotropic brane-world cosmology

Frolov

2001

Physics Letters B

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Section: Discussionmentioning

confidence: 99%

“…A number of cosmological scenarios based on the brane-world concept was explored [5][6][7][8][9], including some models with inflation on the brane [10][11][12][13] and different embedding geometries [14,15].…”

Section: Introductionmentioning

confidence: 99%

Kasner–AdS spacetime and anisotropic brane-world cosmology

Frolov

2001

Physics Letters B

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“…Furthermore, the reheating after inflation based on this scenario has been discussed by Yokoyama and Himemoto [14], and they found that the standard inflationary cosmology is reproduced under the same conditions. However, these results for this new scenario are more or less based on a particular scalar field configuration discussed in [11], the details of which will be explained in the next section. Therefore, strictly speaking, the viability and generality of this scenario should be more carefully examined.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the present spatially homogeneous case, the Bianchi identities supply the evolution equation of E tt on the brane as [11] …”

Section: Braneworld Inflation Without Inflaton On the Branementioning

confidence: 99%

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Bulk scalar field in the braneworld can mimic the 4D inflaton dynamics

2002

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Based on the recently proposed scenario of inflation driven by a bulk scalar field in the braneworld of the Randall-Sundrum (RS) type, we investigate the dynamics of a bulk scalar field on the inflating braneworld. We derive the late-time behavior of the bulk scalar field by analyzing the property of the retarded Green function. We find that the late-time behavior is basically dominated by a single (or a pair of) pole(s) in the Green function irrespective of the initial condition and of the signature of m 2 = V ′′ (φ), where V (φ) is the potential of the bulk scalar field. Including the lowest order backreaction to the geometry, this late-time behavior can be well approximated by an effective fourdimensional scalar field with m 2 eff = m 2 /2. The mapping to the four-dimensional effective theory is given by a simple scaling of the potential with a redefinition of the field. Our result supports the picture that the scenario of inflation driven by a bulk scalar field works in quite a similar way to that in the standard four-dimensional cosmology.

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AdS/CFT on the Brane

Soda¹

2011

From Gravity to Thermal Gauge Theories: The AdS/CFT Correspondence

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It is widely recognized that the AdS/CFT correspondence is a useful tool to study strongly coupled field theories. On the other hand, Randall-Sundrum (RS) braneworld models have been actively discussed as a novel cosmological framework. Interestingly, the geometrical set up of braneworlds is quite similar to that in the AdS/CFT correspondence. Hence, it is legitimate to seek a precise relation between these two different frameworks. In this lecture, I will explain how the AdS/CFT correspondence is related to the RS braneworld models. There are two different versions of RS braneworlds, namely, the single-brane model and the twobrane model. In the case of the single-brane model, we reveal the relation between the geometrical and the AdS/CFT correspondence approach using the gradient expansion method. It turns out that the high energy and the Weyl term corrections found in the geometrical approach correspond to the CFT matter correction found in the AdS/CFT correspondence approach. In the case of two-brane system, we also show that the AdS/CFT correspondence plays an important role in the sense that the low energy effective field theory can be described by the conformally coupled scalar-tensor theory where the radion plays the role of the scalar field. We also discuss dilatonic braneworld models from the point of view of the AdS/CFT correspondence.

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Brane-world inflation without inflaton on the brane

Cited by 108 publications

References 42 publications

Kasner–AdS spacetime and anisotropic brane-world cosmology

Kasner–AdS spacetime and anisotropic brane-world cosmology

Bulk scalar field in the braneworld can mimic the 4D inflaton dynamics

AdS/CFT on the Brane

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