Dimensional reduction in the early universe: Where have the massive particles gone?

Kolb, Edward W.; Slansky, R.

doi:10.1016/0370-2693(84)90298-3

Cited by 144 publications

(111 citation statements)

References 18 publications

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“…In the absence of the radiative corrections, the mixing between the KK gauge bosons would be the same as that for the zero modes, and one would have KK modes of the photon and Z with the same Weinberg angle as the zero modes. The radiative corrections will generally disrupt this relationship, and each KK level will generally have 3 One might be worried about the late decay of the KK graviton into the LKP. Indeed we know that unstable TeV relics may be dangerous if their lifetime exceeds 10 6 s because of their effects on the primordially synthesized abundances of light elements.…”

Section: Universal Extra Dimensionsmentioning

confidence: 99%

Is the lightest Kaluza–Klein particle a viable dark matter candidate?

2003

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In models with universal extra dimensions (i.e. in which all Standard Model fields, including fermions, propagate into compact extra dimensions) momentum conservation in the extra dimensions leads to the conservation of Kaluza-Klein (KK) number at each vertex. KK number is violated by loop effects because of the orbifold imposed to reproduce the chiral Standard Model with zero modes, however, a KK parity remains at any order in perturbation theory which leads to the existence of a stable lightest KK particle (LKP). In addition, the degeneracy in the KK spectrum is lifted by radiative corrections so that all other KK particles eventually decay into the LKP. We investigate cases where the Standard Model lives in five or six dimensions with compactification radius of TeV −1 size and the LKP is the first massive state in the KK tower of either the photon or the neutrino. We derive the relic density of the LKP under a variety of assumptions about the spectrum of first tier KK modes. We find that both the KK photon and the KK neutrino, with masses at the TeV scale, may have appropriate annihilation cross sections to account for the dark matter, Ω M ∼ 0.3.

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Section: Universal Extra Dimensionsmentioning

confidence: 99%

Is the lightest Kaluza–Klein particle a viable dark matter candidate?

2003

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“…Supergravity and super-string theories generally contain a spectrum of particles with masses well in excess of the Planck mass. Moreover, the compact extra-dimensions lead to a tower of nearly degenerate Kaluza-Klein (KK) states [56,57], and as noted above, reheating may require that some of these particles couple to the inflaton field near the end of inflation.…”

Section: Physical Parametersmentioning

confidence: 99%

Possible evidence for Planck-scale resonant particle production during inflation from the CMB power spectrum

Mathews¹,

Gangopadhyay²,

Ichiki³

et al. 2015

Phys. Rev. D

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The power spectrum of the cosmic microwave background from both the Planck and WMAP data exhibits a slight dip for multipoles in the range of l = 10 − 30. We show that such a dip could be the result of the resonant creation of massive particles that couple to the inflaton field. For our best-fit models, the epoch of resonant particle creation reenters the horizon at a wave number of k * ∼ 0.00011 ± 0.0004 (h Mpc −1 ). The amplitude and location of this feature corresponds to the creation of a number of degenerate fermion species of mass ∼ (8 − 11)/λ 3/2 m pl during inflation where λ ∼ (1.0 ± 0.5)N −2/5 is the coupling constant between the inflaton field and the created fermion species, while N is the number of degenerate species. Although the evidence is of marginal statistical significance, this could constitute new observational hints of unexplored physics beyond the Planck scale.

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“…the huge discrepancy between the gravitational scale and the electroweak scale. Furthermore, there is a viable Kaluza-Klein WIMP candidate for the dark matter of the universe [13]. In addition, extra dimensional models explain the large mass hierarchy of the different types and generations of the SM fermions through a geometrical mechanism.…”

Section: Jhep03(2007)113mentioning

confidence: 99%

Successful Yukawa structures in warped extra dimensions

Silva-Marcos

2007

J. High Energy Phys.

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For a RS model, with SM fields in the bulk and the Higgs boson on the TeV-brane, we suggest two specific structures for the Yukawa couplings, one based on a permutation symmetry and the other on the Universal Strength of Yukawa couplings hypothesis (USY). In USY, all Yukawa couplings have equal strength and the difference in the Yukawa structure lies in some complex phase. In both scenarios, all Yukawa couplings are of the same order of magnitude. Thus, the main features of the fermion hierarchies are explained through the RS geometrical mechanism, and not because some Yukawa coupling is extremely small. We find that the RS model is particularly appropriate to incorporate the suggested Yukawa configurations. Indeed, the RS geometrical mechanism of fermion locations along the extra dimension, combined with the two Yukawa scenarios, reproduces all the present experimental data on fermion masses and mixing angles. It is quite remarkable that in the USY case, only two complex phases of definite value ± π 2 are sufficient to generate the known neutrino mass differences, while at same time, permitting large leptonic mixing in agreement with experiment.

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Dimensional reduction in the early universe: Where have the massive particles gone?

Cited by 144 publications

References 18 publications

Is the lightest Kaluza–Klein particle a viable dark matter candidate?

Is the lightest Kaluza–Klein particle a viable dark matter candidate?

Possible evidence for Planck-scale resonant particle production during inflation from the CMB power spectrum

Successful Yukawa structures in warped extra dimensions

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