Astrophysical Probes of Unification

Details Astrophysical Probes of Unification Astrophysical Probes of Unification

2008-12-11

arxiv.org/abs/0812.2075v3

Phys.Rev.D79:105022,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

81 pages, 23 figures, 7 tables; v2: Fig. 3 and Eqn 19 modified with corresponding discussion in the text; v3: version to appea

Scientific paper

10.1103/PhysRevD.79.105022

Traditional ideas for testing unification involve searching for the decay of the proton and its branching modes. We point out that several astrophysical experiments are now reaching sensitivities that allow them to explore supersymmetric unified theories. In these theories the electroweak-mass DM particle can decay, just like the proton, through dimension six operators with lifetime ~ 10^26 sec. Interestingly, this timescale is now being investigated in several experiments including ATIC, PAMELA, HESS, and Fermi. Positive evidence for such decays may be opening our first direct window to physics at the supersymmetric unification scale of M_GUT ~ 10^16 GeV, as well as the TeV scale. Moreover, in the same supersymmetric unified theories, dimension five operators can lead a weak-scale superparticle to decay with a lifetime of ~ 100 sec. Such decays are recorded by a change in the primordial light element abundances and may well explain the present discord between the measured Li abundances and standard big bang nucleosynthesis, opening another window to unification. These theories make concrete predictions for the spectrum and signatures at the LHC as well as Fermi.

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