SO(10)-inspired solution to the problem of the initial conditions in leptogenesis

作者：Di Bari Pasquale^*; Marzola Luca

来源：Nuclear Physics B, 2013, 877(3): 719-751.

DOI：10.1016/j.nuclphysb.2013.10.027

We show that, within SO(10)-inspired leptogenesis, there exists a solution, with definite constraints on neutrino parameters, able simultaneously to reproduce the observed baryon asymmetry and to satisfy the conditions for the independence of the final asymmetry of the initial conditions (strong thermal leptogenesis). We find that the wash-out of a pre-existing asymmetry as large as O(0.1) requires: (i) reactor mixing angle 2 degrees less than or similar to theta(13) less than or similar to 20 degrees, in agreement with the experimental result theta(13) = 8 degrees-10 degrees; (ii) atmospheric mixing angle 16 degrees less than or similar to theta(23) less than or similar to 41 degrees, compatible only with current lowest experimentally allowed values; (iii) Dirac phase in the range -pi/2 less than or similar to delta less than or similar to pi/5, with the bulk of the solutions around delta similar or equal to -pi/5 and such that sign(J(cp)) = - sign(eta B); (iv) neutrino masses m(i) normally ordered; (v) lightest neutrino mass in the range m(1) similar or equal to 15-25 meV, corresponding to Sigma(i) m(i) similar or equal to 85-105 meV; (vi) neutrinoless double beta decay (Ov beta beta) effective neutrino mass m(ee) similar or equal to 0.8m(1). All together this set of predictive constraints characterises the solution quite distinctively, representing a difficultly forgeable, fully testable, signature. In particular, the predictions m(ee) similar or equal to 0.8m(1) similar or equal to 15 meV can be tested by cosmological observations and (ultimately) by Ov beta beta experiments. We also discuss different interesting aspects of the solution such as theoretical uncertainties, stability under variation of the involved parameters, forms of the orthogonal and RH neutrino mixing matrices.

• 出版日期2013-12-21