A de Sitter tachyon thick braneworld

Germán, Gabriel; Herrera–Aguilar, Alfredo; Malagón–Morejón, Dagoberto; Mora–Luna, Refugio Rigel; Rocha, Roldão da

doi:10.1088/1475-7516/2013/02/035

Cited by 46 publications

(85 citation statements)

References 82 publications

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“…[13] where a thick braneworld has been investigated in the cosmological context. In particular, the stability under tensor perturbations and gravity localization has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Tachyon with an inverse power-law potential in a braneworld cosmology

Bilić

Domazet

Djordjević

2017

Class. Quantum Grav.

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We study a tachyon cosmological model based on the dynamics of a 3-brane in the bulk of the second Randall-Sundrum model extended to more general warp functions. A well known prototype of such a generalization is the bulk with a selfinteracting scalar field. As a consequence of a generalized bulk geometry the cosmology on the observer brane is modified by the scale dependent four-dimensional gravitational constant. In particular we study a power law warp factor which generates an inverse power-law potential V ∝ ϕ −n of the tachyon field ϕ. We find a critical power n cr that divides two subclasses with distinct asymptotic behaviors: a dust universe for n > n cr and a quasi de Sitter universe for 0 < n < n cr .

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“…[13] where a thick braneworld has been investigated in the cosmological context. In particular, the stability under tensor perturbations and gravity localization has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Tachyon with an inverse power-law potential in a braneworld cosmology

Bilić

Domazet

Djordjević

2017

Class. Quantum Grav.

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“…In this framework, different kinds of scalar fields give rise to a wide range of scenarios . In particular, some authors have choosen a bulk tachyonic scalar field in order to address problems like the gauge hierarchy, the stabilization of the corresponding brane separation, and the localization of gravity and other matter fields [35][36][37][38][39][40]. However, many attempts to solve the highly non-linear field equations that arise in these scalar-tensor systems lead to imaginary tachyon field configurations [41,42] or to delocalization of gravity and other kinds of matter, like scalar and gauge vector fields (see, for instance, the tachyonic braneworlds constructed in [36,37,41] and references therein).…”

Section: Introduction and Review Of The Thick Tachyonic Braneworldmentioning

confidence: 99%

“…In this paper we use a recently proposed thick tachyonic braneworld configuration with a de Sitter metric induced on the brane and a decaying warp factor that enables the localization of 4D gravity [40], and show that universal gauge vector fields can also be localized in it. Moreover, when analyzing the dynamics of the vector field fluctuations, we see that their spectrum contains a single bound state corresponding to the 4D massless photon of the model, separated from a continuum of massive KK excitations by a mass gap.…”

Section: Introduction and Review Of The Thick Tachyonic Braneworldmentioning

confidence: 99%

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Localization of gauge fields in a tachyonic de Sitter thick braneworld

2014

Self Cite

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In this work we show that universal gauge vector fields can be localized on the recently proposed 5D thick tachyonic braneworld which involves a de Sitter cosmological background induced on the 3-brane. Namely, by performing a suitable decomposition of the vector field, the resulting 4D effective action corresponds to a massive gauge field, while the profile along the extra dimension obeys a Schrödinger-like equation with a Pöschl-Teller potential. It turns out that the massless zero mode of the gauge field is bound to the expanding 3-brane and allows us to recover the standard 4D electromagnetic phenomena of our world. Moreover, this zero mode is separated from the continuum of Kaluza-Klein (KK) modes by a mass gap determined by the scale of the expansion parameter. We also were able to analytically solve the corresponding Schrödinger-like equation for arbitrary mass, showing that KK massive modes asymptotically behave like plane waves, as expected.

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“…A smooth warp factor was investigated? [4][5][6][7][8][9][10][11], but also it did not yield localized gauge fields. Some models obtained the localization by the addition of new degrees of freedom such as a scalar or dilaton fields, but a more natural approach would be to obtain an extension of minimal couplings that would localize the gauge field without introducing other fields.…”

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confidence: 95%

Nonminimal couplings in Randall-Sundrum scenarios

et al. 2015

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In this paper we propose a new way of obtaining four dimensional gauge invariant U (n) gauge field from a bulk action. The results are valid for both Randall-Sundrum scenarios and are obtained without the introduction of other fields or new degrees of freedom. The model is based only in nonminimal couplings with the gravity field. We show that two non-minimal couplings are necessary, one with the field strength and the other with a mass term. Despite the loosing of five dimensional gauge invariance by the mass term a massless gauge field is obtained over the brane. To obtain this, we need of a fine tuning of the two parameters introduced through the couplings. The fine tuning is obtained by imposing the boundary conditions and to guarantee non-abelian gauge invariance in four dimensions. With this we are left with no free parameters and the model is completely determined. The model also provides analytical solutions to the linearized equations for the zero mode and for a general warp factor.PACS numbers: 64.60.ah, 64.60.al, 89.75.Da The Randall Sundrum (RS) model appeared in the Physics of higher dimensions as an alternative to compactification that included the possibility of solving the Hierarchy problem [1,2]. To solve the physical problem of dimensional reduction, the RS models should obtain fields with zero mode confined to the brane in order to recoverer the Physical models when the fields are properly integrated over the extra dimension. In the noncompact case, the gravity field localization is attained, however gauge fields as simple as U (1) minimally coupled to gravity are not localized and this was a problem to the theory [2,3]. For the compact case the problem appears when we consider non-abelian gauge fields. After the Fourier decomposition of the zero mode and the normalization dzψ 2 = 1 we have that dzψ 3 m=0 = 1, and the gauge invariance in four dimensions is lost [4]. A number of extensions to RS were proposed in order to provide localized gauge fields for the non-compact case. A smooth warp factor was investigated? [4][5][6][7][8][9][10][11], but also it did not yield localized gauge fields. Some models obtained the localization by the addition of new degrees of freedom such as a scalar or dilaton fields, but a more natural approach would be to obtain an extension of minimal couplings that would localize the gauge field without introducing other fields. A step in this direction was the introduction of a boundary interaction with the field strength [12], but it is known that this produces only a quasi-localized zero mode.Other idea is the breaking of the U (1) gauge invariance in five dimensions by the addition of a mass term. It was found that the only consistent way of getting a localized zero mode is again the introduction of a boundary term, this time with the mass term [13]. Soon it was shown that the boundary mass term was not enough to provide a consistent model in the case of Yang-Mills (YM) fields because non-abelian gauge invariance is lost in the membrane [4]. The work [4] shows th...

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A de Sitter tachyon thick braneworld

Cited by 46 publications

References 82 publications

Tachyon with an inverse power-law potential in a braneworld cosmology

Tachyon with an inverse power-law potential in a braneworld cosmology

Localization of gauge fields in a tachyonic de Sitter thick braneworld

Nonminimal couplings in Randall-Sundrum scenarios

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