Gauged<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>−</mml:mo><mml:mi>L</mml:mi></mml:math>symmetry and baryogenesis via leptogenesis at TeV scale

Sahu, Narendra; Yajnik, Urjit A.

doi:10.1103/physrevd.71.023507

Cited by 32 publications

(35 citation statements)

References 42 publications

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“…This relation raises the interesting possibility that the scale of M R can be as low as 10 4 to 10 6 GeV, with corresponding very low scale 10 3 to 10 4 GeV of lepton number violation, opening the possibility of low energy leptogenesis [31][40].…”

Section: Minimal Supersymmetric Left-right Model : a Recapmentioning

confidence: 99%

“…This particular approach however has been shown to generically require the scale of majorana neutrino mass, equivalently, the scale of gauged B − L symmetry breaking in relevant models, to be 10 11 -10 13 GeV [26,27], with a more optimistic constraint M B−L > 10 9 GeV [28,29]. On the other hand, it has been shown [30,31] that the only real requirement imposed by Leptogenesis is that the presence of heavy neutrinos should not erase lepton asymmetry generated by a given mechanism, possibly non-thermal. This places the modest bound M 1 > 10 4 GeV, on the mass of the lightest of the heavy majorana neutrinos.…”

Section: Introductionmentioning

confidence: 99%

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Gauge mediated supersymmetry breaking and the cosmology of the left-right symmetric model

2009

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Left-Right symmetry including supersymmetry presents an important class of gauge models which may possess natural solutions to many issues of phenomenology. Cosmology of such models indicates a phase transition accompanied by domain walls. Such walls must be unstable in order to not conflict with standard cosmology, and can further be shown to assist with open issues of cosmology such as dilution of unwanted relic densities and leptogenesis. In this paper we construct a model of gauge mediated supersymmetry breaking in which parity breaking is also signalled along with supersymmetry breaking and so as to be consistent with cosmological requirements.It is shown that addressing all the stated cosmological issues requires an extent of fine tuning, while in the absence of fine tuning, leptogenesis accompanying successful completion of the phase transition is still viable.

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Section: Minimal Supersymmetric Left-right Model : a Recapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gauge mediated supersymmetry breaking and the cosmology of the left-right symmetric model

2009

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“…Being generically below 10 9 GeV, this avoids the gravitino mass bound but requires non-thermal leptogensis [4].…”

Section: Left-right Symmetry : a Quick Introductionmentioning

confidence: 99%

Left-right symmetry, supersymmetry: Cosmological constraint

Yajnik¹,

Mishra²,

Borah³

2013

AIP Conference Proceedings

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Unified models incorporating the right handed neutrino in a symmetric way generically possess parity symmetry. If this is broken spontaneously it results in the formation of domain walls in the early Universe, whose persistence is unwanted. We have considered several scenarios for the pressure difference resulting in intrinsic destabilisation of the walls. Requiring this to arise from small parity breaking effects beyond the tree level places an upper bound on the scale of spontaneous parity breaking, often much lower than the GUT scale. In the left-right symmetric models studied the upper bound is no higher than 10 11 GeV but a scale as low as 10 5 GeV is acceptable.

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“…More realistic scenarios therefore demand leptogenesis to be nonthermal in this class of models, either through bubble walls of a first order phase transition at the electroweak scale, or DW of the parity breaking phase transition. It has been shown [15,16] that the only real requirement imposed by leptogenesis is that the presence of heavy neutrinos should not erase lepton asymmetry generated by a given mechanism, possibly nonthermal. This places the modest bound M 1 > 10 4 GeV, on the mass of the lightest of the heavy Majorana neutrinos.…”

Section: Introductionmentioning

confidence: 99%

Cosmology in a supersymmetric model with gaugedB−Lsymmetry

Sarkar

Yajnik

2007

Phys. Rev. D

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We consider salient cosmological features of a supersymmetric model which is left-right symmetric and therefore possessing gauged B ÿ L symmetry. The requirement of breaking parity and also obtaining charge preserving vacua introduces some unique features to this model (MSLRM), resulting in a preference for nonthermal leptogenesis. Assuming that the model preserves TeV scale supersymmetry, we show that the vacuum structure generically possesses domain walls, which can serve two important purposes. They can signal a secondary inflation required to remove unwanted relics such as gravitino and moduli and also generate lepton asymmetry by a mechanism similar to electroweak baryogenesis. The requirement of disappearance of domain walls imposes constraints on the soft parameters of the theory, testable at the TeV scale. We also propose an alternative model with spontaneous parity violation (MSLR6 P). Incorporating the same cosmological considerations in this case entails constraints on a different set of soft parameters.

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GaugedB−Lsymmetry and baryogenesis via leptogenesis at TeV scale

Cited by 32 publications

References 42 publications

Gauge mediated supersymmetry breaking and the cosmology of the left-right symmetric model

Gauge mediated supersymmetry breaking and the cosmology of the left-right symmetric model

Left-right symmetry, supersymmetry: Cosmological constraint

Cosmology in a supersymmetric model with gaugedB−Lsymmetry

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