Relaxing cosmological constraints on large extra dimensions

Macesanu, Cosmin; Trodden, Mark

doi:10.1103/physrevd.71.024008

Cited by 7 publications

(7 citation statements)

References 41 publications

(55 reference statements)

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“…Indeed, as was observed in Ref. [34] for the related case of KK-graviton decays, such modes are innocuous precisely because of the large contributions to their decay widths from hadronic decays. The axion case under consideration here differs qualitatively from this KK-graviton case only in that the decay width Γ λ of each a λ contains an additional factor ( λ 2 A λ ) 2 .…”

Section: A Decays To Standard-model Statesmentioning

confidence: 90%

Dynamical dark matter. II. An explicit model

2012

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In a recent paper [1], we introduced "dynamical dark matter," a new framework for dark-matter physics, and outlined its underlying theoretical principles and phenomenological possibilities. Unlike most traditional approaches to the dark-matter problem which hypothesize the existence of one or more stable dark-matter particles, our dynamical dark-matter framework is characterized by the fact that the requirement of stability is replaced by a delicate balancing between cosmological abundances and lifetimes across a vast ensemble of individual dark-matter components. This setup therefore collectively produces a time-varying cosmological dark-matter abundance, and the different dark-matter components can interact and decay throughout the current epoch. While the goal of our previous paper was to introduce the broad theoretical aspects of this framework, the purpose of the current paper is to provide an explicit model of dynamical dark matter and demonstrate that this model satisfies all collider, astrophysical, and cosmological constraints. The results of this paper therefore constitute an "existence proof" of the phenomenological viability of our overall dynamical dark-matter framework, and demonstrate that dynamical dark matter is indeed a viable alternative to the traditional paradigm of dark-matter physics. Dynamical dark matter must therefore be considered alongside other approaches to the dark-matter problem, particularly in scenarios involving large extra dimensions or string theory in which there exist large numbers of particles which are neutral under Standard-Model symmetries.

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Section: A Decays To Standard-model Statesmentioning

confidence: 90%

Dynamical dark matter. II. An explicit model

2012

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“…The non-trivial curvature induced on the bulk metric may be studied above these energies by including the tower of non-zero KK gravitons as effective 4d particles. Brane-world cosmology with flat bulk has received much careful study, although previous work has mostly focused on the low-energy regime (although far above R −1 ), under a "normalcy temperature" T * evaluated in [15,16], where the bulk size is assumed to have been already stabilized by an unspecified high-energy mechanism and the non-zero KK gravitons do not have a significant effect on the evolution of the brane metric. The effect of brane matter on the bulk metric evolution at earlier times, and the consequent alteration of the brane metric evolution, has not yet been studied systematically in an arbitrary number of dimensions.…”

Section: Introductionmentioning

confidence: 99%

Brane cosmology in an arbitrary number of dimensions

2006

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We derive the effective cosmological equations for a non-Z 2 symmetric codimension one brane embedded in an arbitrary D-dimensional bulk spacetime, generalizing the D = 5, 6 cases much studied previously. As a particular case, this may be considered as a regularized codimension (D-4) brane avoiding the problem of curvature divergence on the brane. We apply our results to the case of spherical symmetry around the brane and to partly compactified AdS-Schwarzschild bulks.

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“…This can take place in two ways; either through the exchange of virtual gravitons, or with the production of a real graviton in the final state. In the first case, a SM quark or gluon is produced together with a KK excitation in the final state; the expected signals for such processes are two large p T jet events plus missing energy [12]. In the second case, which constitute the topic of the present paper, one will have a graviton in the final states together with a single KK excitation or a SM quark or gluon.…”

Section: Introductionmentioning

confidence: 95%

“…Second, one can now have production of a single KK excitation of matter, mediated by gravity. The case when the gravitons involved in production are virtual particles has been discussed in [12]; in this article we will discuss the case when gravitons appear as final state particles.…”

Section: Model Descriptionmentioning

confidence: 99%

Monojet and single photon signals from universal extra dimensions

2006

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The usual universal extra dimensions scenario does not allow for single production of first level Kaluza-Klein (KK) excitations of matter due to the KK number conservation. However, if the matter fields are localized on a fat brane embedded in a higher dimensional space, matter-gravitation interactions violate KK number, and the production of single KK excitations becomes possible. In this paper we analyze the production of a single KK matter excitation together with a graviton in the final state, and study the potential for discovery at the Tevatron and Large Hadron Collider.

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Relaxing cosmological constraints on large extra dimensions

Cited by 7 publications

References 41 publications

Dynamical dark matter. II. An explicit model

Dynamical dark matter. II. An explicit model

Brane cosmology in an arbitrary number of dimensions

Monojet and single photon signals from universal extra dimensions

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