Dilaton and off-shell (non-critical string) effects in Boltzmann equation for species abundances

Lahanas, A.B.; Mavromatos, Nick E.; Nanopoulos, Dimitri V.

doi:10.1186/1754-0410-1-2

Cited by 35 publications

(76 citation statements)

References 31 publications

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“…In particular the modification to the continuity equation of brane the energy density due to the form of the five dimensional background is given by ρ dimensional considerations studied in [57][58][59][60]. In the first of the above cases the dilaton field as is seen from the brane tends asymptotically to the linear dilaton vacuum if it is re-expressed in terms of the five-dimensional time.…”

Section: Summary and Discussionmentioning

confidence: 99%

Universe acceleration in brane world models

2014

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We examine the cosmology induced on a brane moving in the background of a five-dimensional black hole, solution of the string effective action. The evolution, determined by the Israel junction conditions is found to be compatible with an accelerating universe with the present day acceleration coming after a decelerating phase. The possible species of the energy-momentum tensor, localized on the brane, for these solutions to be valid are discussed.

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Section: Summary and Discussionmentioning

confidence: 99%

Universe acceleration in brane world models

2014

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“…From (16) it can be shown [10] that in three spatial dimensions the energy density ρ of the DM species X satisfies…”

Section: B Derivation Of (3)mentioning

confidence: 99%

Asymptotic analysis of the Boltzmann equation for dark matter relics

Bender

Sarkar

2012

Journal of Mathematical Physics

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This paper presents an asymptotic analysis of the Boltzmann equations (Riccati differential equations) that describe the physics of thermal dark-matter-relic abundances. Two different asymptotic techniques are used, boundary-layer theory, which makes use of asymptotic matching, and the delta expansion, which is a powerful technique for solving nonlinear differential equations. Two different Boltzmann equations are considered. The first is derived from general relativistic considerations and the second arises in dilatonic string cosmology. The global asymptotic analysis presented here is used to find the long-time behavior of the solutions to these equations. In the first case the nature of the so-called freeze-out region and the post-freeze-out behavior is explored. In the second case the effect of the dilaton on cold dark-matter abundances is calculated and it is shown that there is a large-time power-law fall off of the dark-matter abundance. Corrections to the power-law behavior are also calculated.

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“…The WMAP 2σ measurements of the cold dark matter density [56], 0.095 ≤ Ω χ ≤ 0.129. In addition, we look at the Supercritical String Cosmology (SSC) model [57], in which a dilution factor of O(10) is allowed [58], where Ω χ 1.1. For a discussion of the SSC model within the context of mSUGRA, see [59].…”

Section: Low Energy Supersymmetry Phenomenologymentioning

confidence: 99%

Dark matter, proton decay and other phenomenological constraints in

Maxin

Nanopoulos

et al. 2011

Nuclear Physics B

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We study gravity mediated supersymmetry breaking in F-SU (5) and its low-energy supersymmetric phenomenology. The gaugino masses are not unified at the traditional grand unification scale, but we nonetheless have the same one-loop gaugino mass relation at the electroweak scale as minimal supergravity (mSUGRA). We introduce parameters testable at the colliders to measure the small second loop deviation from the mSUGRA gaugino mass relation at the electroweak scale.In the minimal SU (5) model with gravity mediated supersymmetry breaking, we show that the deviations from the mSUGRA gaugino mass relations are within 5%. However, in F-SU (5), we predict the deviations from the mSUGRA gaugino mass relations to be larger due to the presence of vector-like particles, which can be tested at the colliders. We determine the viable parameter space that satisfies all the latest experimental constraints and find it is consistent with the CDMS II experiment. Further, we compute the cross-sections of neutralino annihilations into gamma-rays and compare to the first published Fermi-LAT measurement. Finally, the corresponding range of proton lifetime predictions is calculated and found to be within reach of the future Hyper-Kamiokande and DUSEL experiments.

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Dilaton and off-shell (non-critical string) effects in Boltzmann equation for species abundances

Cited by 35 publications

References 31 publications

Universe acceleration in brane world models

Universe acceleration in brane world models

Asymptotic analysis of the Boltzmann equation for dark matter relics

Dark matter, proton decay and other phenomenological constraints in

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