Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,
Tel (Office): (865) 574-6124 (FAX): (865) 574-1268
Rapidly rotating stars that produce high-mass proto-neutron stars are considered potential progenitors of gamma-ray bursts that might be powered by a collapsar, i.e., a black hole surrounded by an accretion torus, or, if collapse to a black hole does not occur sufficiently early, by a long-lived proto-magnetar. Coupling special relativistic magnetohydrodynamics, a pseudo-relativistic gravitational potential, and two-moment neutrino transport, we performed axisymmetric simulations of stars of 35 solar masses that fall into the class of potential gamma-ray burst (GRB) progenitors. The results show explosions launched by mechanisms to which neutrino heating, rotation, and magnetic fields contribute to different degrees. The explosions occur in parallel to ongoing accretion onto the proto-neutron star, hence allowing for its growth in mass and rotational energy and, as a possible consequence, for later GRBs.
Alfredo Galindo-Uribarri, (865) 574-6124