Gravity-induced instability and gauge field localization

Farakos, K.; Pasipoularides, P.

doi:10.1016/j.physletb.2005.06.058

Cited by 30 publications

(67 citation statements)

References 32 publications

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“…Thus gauge fields, and more generally fermions and bosons with gauge charge, can not escape into the bulk unless we give them energy greater than the mass gap Λ G , which emerges from the nonperturbative confining dynamics of the gauge field model in the bulk. For an extensive discussion see [10].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Gauss-Bonnet gravity, brane world models, and nonminimal coupling

Farakos

Pasipoularides

2007

Phys. Rev. D

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We study the case of brane world models with an additional Gauss-Bonnet term in the presence of a bulk scalar field which interacts non-minimally with gravity, via a possible interaction term of the form − 1 2 ξRφ 2 . The Einstein equations and the junction conditions on the brane are formulated, in the case of the bulk scalar field. Static solutions of this model are obtained by solving numerically the Einstein equations with the appropriate boundary conditions on the brane. Finally, we present graphically and comment these solutions for several values of the free parameters of the model.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Gauss-Bonnet gravity, brane world models, and nonminimal coupling

Farakos

Pasipoularides

2007

Phys. Rev. D

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“…The non-zero components of the 5D Einstein equation read [324,325,326,327,328,329,330,331,332,333,334,335,33 37) where primes indicate derivatives with respect to y and dots derivatives with respect to t. On the brane we assume a perfect fluid…”

Section: Quintom De In the Braneworldmentioning

confidence: 99%

Quintom cosmology: Theoretical implications and observations

et al. 2010

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We review the paradigm of quintom cosmology. This scenario is motivated by the observational indications that the equation of state of dark energy across the cosmological constant boundary is mildly favored, although the data are still far from being conclusive. As a theoretical setup we introduce a no-go theorem existing in quintom cosmology, and based on it we discuss the conditions for the equation of state of dark energy realizing the quintom scenario. The simplest quintom model can be achieved by introducing two scalar fields with one being quintessence and the other phantom. Based on the double-field quintom model we perform a detailed analysis of dark energy perturbations and we discuss their effects on current observations. This type of scenarios usually suffer from a manifest problem due to the existence of a ghost degree of freedom, and thus we review various alternative realizations of the quintom paradigm. The developments in particle physics and string theory provide potential clues indicating that a quintom scenario may be obtained from scalar systems with higher derivative terms, as well as from nonscalar systems. Additionally, we construct a quintom realization in the framework of braneworld cosmology, where the cosmic acceleration and the phantom divide crossing result from the combined effects of the field evolution on the brane and the competition between four and five dimensional gravity. Finally, we study the outsets and fates of a universe in quintom cosmology. In a scenario with null energy condition violation one may obtain a bouncing solution at early times and therefore avoid the Big Bang singularity. Furthermore, if this occurs periodically, we obtain a realization of an oscillating universe. Lastly, we comment on several open issues in quintom cosmology and their connection to future investigations.

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“…A specific form of this coupling corresponds to the gravitational term appearing in the so-called tensor-scalar theory of gravity [14]. A Bulk scalar field non-minimally coupled through a coupling of the form φ 2 R has also been considered in the Randall-Sundrum framework and numerical solutions have been discussed [15].…”

Section: Introductionmentioning

confidence: 99%

Brane models with a Ricci-coupled scalar field

2006

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We consider the problem of a scalar field, non-minimally coupled to gravity through a −ξφ 2 R term, in the presence of a Brane. Exact solutions, for a wide range of values of the coupling parameter ξ, for both φ-dependent and φ-independent Brane tension, are derived and their behaviour is studied. In the case of a Randall-Sundrum geometry, a class of the resulting scalar field solutions exhibits a folded-kink profile. We go beyond the Randall-Sundrum geometry studying general warp factor solutions in the presence of a kink scalar. Analytic and numerical results are provided for the case of a Brane or for smooth geometries, where the scalar field acts as a thick Brane. It is shown that finite geometries with warp factors that asymptotically decrease exponentially are realizable for a wide range of parameter values. We also study graviton localization in our setup and find that the localizing potential for gravitons with the characteristic volcano-like profile develops a local maximum located at the origin for high values of the coupling ξ.

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Gravity-induced instability and gauge field localization

Cited by 30 publications

References 32 publications

Gauss-Bonnet gravity, brane world models, and nonminimal coupling

Gauss-Bonnet gravity, brane world models, and nonminimal coupling

Quintom cosmology: Theoretical implications and observations

Brane models with a Ricci-coupled scalar field

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