Seek to better understand BH-accretion disk systems
This includes the spin rate and how might that spin rate be affected by neutrino emission
Collapsers
Stars massive enough that there is no TII-SNe, instead a direct collapse to a BH
This leaves behind the BH with a disk of material which can power strong jets
This can prove to be the source of the long duration GrBs
Neutrino Cooling
Jets are powered by the spin of the central BH and B field strength
For GrBs to be produce the accretion disk needs to be in a MAD state.
Neutrinos are thought to be a source of `cooling’ or reduction of energy from the systems, as they are produced in the core during collapses and can easily escape, drawing energy away from the system
This paper proposes the effects of this neutrino cooling on the system
Authors model two versions, one with constant density, and one with a `power slope radius,’ meaning that density various with radius. This affects accretion rates and shows that faster spinning systems accrete slower
Accretion rates also play a key part in neutrino rate emission efficiency
Slower spinning BHs lead to weaker jets, leading to the BH being kicked out of the MAD faster, leading to shorter and fainter GrBs
Neutrino cooling doesn’t affect the cooling rate directly, instead effecting other things, such as the magnetic field(????)