At the heart of the problem

Jun 17th, 2015
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Alhambra Medical University
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without such fine tuning and without some solution to the hierarchy problem. But it is this problem that places so many variables towards solving the actual Neutrino mass problem.

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At the heart of the problem here is the Planck scale or , where GN is theTEV, where .is the Newtons coupling constant. The essence of this problem can be captured in asingle question: why is gravity some 10^38 orders of magnitude weaker than other forcesof Nature? Behind this major problem is the question of the mass of these KK seriesNeutrinos. Their mass, another unknown, sets limits on the size of the extra dimensions.The whole problem is similar to balancing a billiard cue on its point. It is mechanicallypossible, but, but the amount of fine tuning required for such a delicate balance is toodemanding to be of a practical use. And I might add its not natural. Again back to theheart of the problem Similarly, making the SM work for all energies up to the Planckscale would require tremendous amount of fine tuning of its parameters to a precision ofwithout such fine tuning and without some solution to the hierarchy problem. But it isthis problem that places so many variables towards solving the actual Neutrino massproblem.Models with extra dimensions appearing at or near the TeV scale have become verypopular in recent years. In these models, Kaluza-Klein (KK) excitations appear asparticles with masses of the scale of the extra dimension. Due to conservation ofmomentum in the higher dimensions, a symmetry called KK parity can arise which can,in some cases, make the lightest KK particle (LKP) stable However the size of the extradimension is a variable i

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