WMAP dark matter constraints and Yukawa unification in supergravity models with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>phases

Gómez, M. E.; Ibrahim, Tarek; Nath, Pran; Skadhauge, Solveig

doi:10.1103/physrevd.72.095008

Cited by 41 publications

(17 citation statements)

References 102 publications

(138 reference statements)

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“…The above situation may slightly improve for m e N LSP < M W , in large tan β scenarios with light Higgs bosons that couple appreciably to b-quarks [74]. In particular, in the kinematic region…”

Section: Thermal Right-handed Sneutrinos As Cdmmentioning

confidence: 97%

Anatomy ofF_D-term hybrid inflation

Garbrecht

Pallis

Pilaftsis

2006

J. High Energy Phys.

156

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We analyze the cosmological implications of F -term hybrid inflation with a subdominant FayetIliopoulos D-term whose presence explicitly breaks a D-parity in the inflaton-waterfall sector. This scenario of inflation, which is called F D -term hybrid model for brevity, can naturally predict lepton number violation at the electroweak scale, by tying the µ-parameter of the MSSM to an SO(3)-symmetric Majorana mass m N , via the vacuum expectation value of the inflaton field. We show how a negative Hubble-induced mass term in a next-to-minimal extension of supergravity helps to accommodate the present CMB data and considerably weaken the strict constraints on the theoretical parameters, resulting from cosmic string effects on the power spectrum P R .The usual gravitino overabundance constraint may be significantly relaxed in this model, once the enormous entropy release from the late decays of the ultraheavy waterfall gauge particles is properly considered. As the Universe enters a second thermalization phase involving a very low reheat temperature, which might be as low as about 0.3 TeV, thermal electroweak-scale resonant leptogenesis provides a viable mechanism for successful baryogenesis, while thermal righthanded sneutrinos emerge as new possible candidates for solving the cold dark matter problem.In addition, we discuss grand unified theory realizations of F D -term hybrid inflation devoid of cosmic strings and monopoles, based on the complete breaking of an SU(2) X subgroup. The F D -term hybrid model offers rich particle-physics phenomenology, which could be probed at highenergy colliders, as well as in low-energy experiments of lepton flavour or number violation.

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Section: Thermal Right-handed Sneutrinos As Cdmmentioning

confidence: 97%

Anatomy ofF_D-term hybrid inflation

Garbrecht

Pallis

Pilaftsis

2006

J. High Energy Phys.

156

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“…Likewise, Ref. [49] examined a very specific case, namely, the dependence of h 2 on phases that arise through supersymmetric loop corrections to the b-quark mass in SUGRA models with Yukawa unification. For the general MSSM, the effects of a phase in the trilinear coupling of the top squark on the neutralino annihilation near a Higgs resonance were discussed in [50] and more recently in [51], but without analyzing the phase dependence of h 2 .…”

Section: Introductionmentioning

confidence: 99%

Relic density of neutralino dark matter in the MSSM withCPviolation

Bélanger¹,

Boudjema²,

Kraml³

et al. 2006

Phys. Rev. D

106

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We calculate the relic density of dark matter in the MSSM with CP violation. We analyze various scenarios of neutralino annihilation: the cases of a b-ino, b-ino-W-ino and b-ino-Higgsino LSP, annihilation through Higgs, as well as sfermion coannihilation scenarios. Large phase effects are found-on the one hand, due to shifts in the masses; on the other hand, due to modifications of the couplings. Taking special care to disentangle the effects in masses and couplings, we demonstrate that the presence of CP phases can have a significant influence on the neutralino relic abundance. Typical variations in h 2 solely from modifications in the couplings are O (10%-100%), but can reach an order of magnitude in some cases.

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“…However, these large values for λ and ρ are not compatible with the constraints derived by inflation. The situation differs for sneutrino masses m e N < m W , in large tan β scenarios, in which light Higgs bosons couple appreciably to b-quarks [35]. In particular, in the kinematic region…”

Section: Jhep10(2008)080mentioning

confidence: 97%

Thermal right-handed sneutrino dark matter in theF_D-term model of hybrid inflation

Deppisch

Pilaftsis

2008

J. High Energy Phys.

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We discuss the relic abundance of the right-handed sneutrinos in the supersymmetric F D -term model of hybrid inflation. As well as providing a natural solution to the µand gravitino overabundance problems, the model offers the lightest right-handed sneutrino as a candidate for thermal dark matter. The F D -term model predicts a new quartic coupling of purely right-handed sneutrinos to the Higgs doublets that thermalizes the sneutrinos and makes them annihilate sufficiently fast to a level compatible with the current cosmic microwave background data. We discuss this scenario and identify favourable regions of the parameter space within mSUGRA.

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WMAP dark matter constraints and Yukawa unification in supergravity models withCPphases

Cited by 41 publications

References 102 publications

Anatomy ofF_D-term hybrid inflation

Anatomy ofF_D-term hybrid inflation

Relic density of neutralino dark matter in the MSSM withCPviolation

Thermal right-handed sneutrino dark matter in theF_D-term model of hybrid inflation

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WMAP dark matter constraints and Yukawa unification in supergravity models withCPphases

Cited by 41 publications

References 102 publications

Anatomy ofFD-term hybrid inflation

Anatomy ofFD-term hybrid inflation

Relic density of neutralino dark matter in the MSSM withCPviolation

Thermal right-handed sneutrino dark matter in theFD-term model of hybrid inflation

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Anatomy ofF_D-term hybrid inflation

Anatomy ofF_D-term hybrid inflation

Thermal right-handed sneutrino dark matter in theF_D-term model of hybrid inflation