Long range neutrino forces and the lower bound on neutrino mass
  Stellar objects (including our Sun, other stars of main sequence, white dwarfs, neutron stars etc.) contain strongly degenerate low energy sea of neutrinos (in neutron stars) or antineutrinos. The presence of this sea leads due to Pauli principle and thermal effects to effective blocking of the long-range neutrino forces. This blocking can resolve the problem of the unphysically large value of the self-energy of stars stipulated by many body long-range neutrino interactions. As a consequence no lower bound on the neutrino mass is inferred, in contrast with the statement by Fischbach. 
Alexei Yu. Smirnov and Francesco Vissani