Abstract
We revisit the recently studied supersymmetric gauged inverse seesaw model [1] to incorporate astrophysical constraints on lightest supersymmetric particle (LSP) lifetime such that LSP constitutes the dark matter of the Universe. The authors in [1] considered light sneutrino LSP that can play the role of inelastic dark matter (iDM) such that desired iDM mass splitting and tiny Majorana masses of neutrinos can have a common origin. Here we consider a generalized version of this model without any additional discrete symmetry. We point out that due to spontaneous R-parity(Rp=(-1)3(B-L)+2s) breaking in such generic supersymmetric gauged inverse seesaw models, LSP can not be perfectly stable but decays to standard model particles after non-renormalizable operators allowed by the gauge symmetry are introduced. We show that strong astrophysical constraints on LSP lifetime makes sneutrino dark matter more natural than standard neutralino dark matter. We also show that long-livedness of sneutrino dark matter constrains the left right symmetry breaking scale MR＜104 GeV.
Highlights
Left-Right Symmetric Models (LRSM) [2,3,4,5,6] provide a framework within which spontaneous parity breaking as well as tiny neutrino masses [7,8,9,10] can be successfully implemented without reference to very high scale physics such as grand unification
We show that long-livedness of sneutrino dark matter constrains the left right symmetry breaking scale M R < 104 GeV
Incorporating Supersymmetry (SUSY) into it comes with other advantages like providing a solution to the gauge hierarchy problem, and providing a Cold Dark Matter candidate which is the lightest supersymmetric particle (LSP)
Summary
Left-Right Symmetric Models (LRSM) [2,3,4,5,6] provide a framework within which spontaneous parity breaking as well as tiny neutrino masses [7,8,9,10] can be successfully implemented without reference to very high scale physics such as grand unification. The model we study in this letter, breaks R-parity spontaneously, does not give rise to tree level mixing terms between LSP and standard model fermions. We point out that LSP dark matter, stable at the renormalizable level, decays after higher dimensional gauge invariant terms are introduced The strength of such operators will be tightly constrained from the fact that LSP lifetime should be longer than the age of the Universe and large enough so as to agree with astrophysical observations of nearby galaxies and clusters [21]. It is worth mentioning that constraints on the left-right symmetry breaking scale in such a model were derived recently in [23] from the requirement of successful gauge coupling unification and disappearance of transitory domain walls formed as a result of spontaneous discrete symmetry breaking.
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