Abstract
Pontecorvo (1959) suggested that, because of the negligible absorption of neutrino upon interaction with matter, the neutrino emission can play a significant role in stellar evolution. The profound implication of neutrino emission in the case of stellar evolution has been studied by many authors according to the current-current coupling theory which was suggested by Feynman and Gell-Mann (1958) and also by Sudarshan and Marshak (1958). According to the current-current coupling theory neutrino emission processes are only important when the temperature exceeds 4 x 108 K. Recently Bandyopadhyay (1968) has proposed that photons can interact weakly only with neutrinos. Considering this photon-neutrino coupling theory, Ray Chaudhuri (1970) has suggested that plasma neutrino emission process may prevent the helium flash in certain red giant stars. Also from an analysis of plasma neutrino emission (Ray Chaudhuri, 1970b) and neutrino synchrotron radiation (Ray Chaudhuri, 1970c) process Ray Chaudhuri has shown that the observed deficiency of white dwarf mass above 0.9M e can be explained according to the photon neutrino coupling theory. Therefore, from the observational evidence we cannot exclude the photonneutrino coupling theory; though no categorical answer from the terrestrial experiment can be given at present. The direct determination of the existence of the photonneutrino coupling theory using the elastic scattering of electrons by fission antineutrinos as attempted by Reines and Gurr (1970) (Bandyopadhyay and Ray Cbaudhurl, 1970) as well as by detection of solar neutrinos using knock on electrons produced in the neutrino electron scattering has been discussed by Ray Chaudhuri and Bandyopadhyay (1969). Again Bandyopadhyay et al. (1969) have considered the photon-neutrino elastic scattering on the basis of this photon-neutrino coupling theory and have shown that the cross section for the process v +p ~ v +p is at least an order smaller than that of the process f +p ~ n+ e + which is well within the experimental upper limit. Assuming that this type of neutrino emission processes do occur in reality, we wish to point out that the neutrino emission can also play a significant role in the Main Sequence stage (i.e. hydrogen burning); and from the balance of energy generation we point out the possible nuclear process which may be active in that stage.
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