PRIMORDIAL NUCLEOSYNTHESIS, ADDITIONAL NEUTRINOS AND NEUTRAL CURRENTS FROM THE SUPERSTRING
The constraint on the number of neutrino species Nv imposed by Big Bang nucleosynthesis is reviewed critically. It is argued that uncertainites in the neutron lifetime, systematic errors in the measurement of 4He abundance, and new astrophysical data on 3He which suggest extensive astration of D, pe...
| Main Authors: | , , , |
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| 格式: | Journal article |
| 語言: | English |
| 出版: |
1986
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