General relativistic effects on neutrino-driven winds from young, hot neutron stars and r-process nucleosynthesis

Neutrino-driven winds from young hot neutron stars, which are formed by sup ernova explosions, are the most promising candidate site for r-process nucl eosynthesis. We study general relativistic effects on this wind in Schwarzs child geometry in order to look for suitable conditions for successful r-pr ocess nucleosynthesis. It is quantitatively demonstrated that: general rela tivistic effects play a significant role in increasing the entropy and decr easing the dynamic timescale of the neutrino-driven wind. Exploring the wid e parameter region that determines the expansion dynamics of the wind, we f ind interesting physical conditions that lead to successful r-process nucle osynthesis. The conditions that we found are realized in a neutrino-driven wind with a very short dynamic timescale, tau(dyn) similar to 6 ms, and a r elatively low entropy, S similar to 140. We carry out alpha-process and r-p rocess nucleosynthesis calculations on these conditions with our single net work code, which includes over 3000 isotopes, and confirm quantitatively th at the second and third r-process abundance peaks are produced in neutrino- driven winds.