Effects of SmallScale Fluctuations of Neutrino Flux in Supernova Explosions.pdfVIP

Effects of Small-Scale Fluctuations of Neutrino Flux in Supernova Explosions 3 Hideki Madokoro, Tetsuya Shimizu, and Yuko Motizuki 0 0 RIKEN, Hirosawa 2-1, Wako 351-0198, Japan madokoro@postman.riken.go.jp 2 t c O Summary. We examine effects of small-scale fluctuations with angle in the neutrino radiation in core-collapse supernova explosions. As the mode number of fluctuations 7 increases, the results approach those of spherical explosion. We conclude that global 1 anisotropy of the neutrino radiation is the most effective mechanism of increasing 1 the explosion energy when the total neutrino luminosity is given. v 1 8 1 Introduction 4 0 1 It has been turned out that most simulations of core-collapse supernova explosions 3 with spherical symmetry fail to produce a successful explosion[1]. In addition, ob- 0 servations suggest that the ejecta of core-collapse supernova explosions are aspher- / ical(e.g., [2]). These facts lead us to multidimensional simulations. In 2-D and 3-D h p simulations[3, 4, 5, 6, 7, 8, 9, 10, 11], it has been shown that multidimensional effects, - such as convection inside the proto-neutron star and convective overturn around the o neutrino-heated region, increase the explosion energy and can trigger a successful r explosion[4, 6, 12]. t s When a proto-neutron star rotates, the neutrino flux is expected to be enhanced a along the rotational (polar) a