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QCD surprises: strong CP problem, neutrino mass, Dark Matter and Dark Energy

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arxiv 2106.03549 v3 pith:E47L2QIG submitted 2021-06-04 hep-ph gr-qchep-th

QCD surprises: strong CP problem, neutrino mass, Dark Matter and Dark Energy

classification hep-ph gr-qchep-th
keywords darkneutrinosneutrinocandidatecondensateenergymassmatter
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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An unexpected explanation for neutrino mass, Dark Matter (DM) and Dark Energy (DE) from genuine Quantum Chromodynamics (QCD) of the Standard Model (SM) is proposed here, while the strong CP problem is resolved without any need to account for fundamental axions. We suggest that the neutrino sector can be in a double phase in the Universe: i) relativistic neutrinos, belonging to the SM; ii) non-relativistic condensate of Majorana neutrinos. The condensate of neutrinos can provide an attractive alternative candidate for the DM, being in a cold coherent state. We will explain how neutrinos, combining into Cooper pairs, can form collective low-energy degrees of freedom, hence providing a strongly motivated candidate for the QCD (composite) axion.

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