Microphysics in the gamma ray burst central engine

Abstract

We calculate the structure and evolution of a gamma ray burst central engine where an accreting torus has formed around the newly born black hole. We study the general relativistic,MHD models and we self-consistently incorporate the nuclear equation of state. The latter accounts for the degeneracy of relativistic electrons, protons, and neutrons, and is used in the dynamical simulation, instead of a standard polytropic -law. The EOS provides the conditions for the nuclear pressure in the function of density and temperature, which evolve with time according to the conservative MHD scheme. We analyze the structure of the torus and outflowing winds, and compute the neutrino flux emitted through the nuclear reactions balance in the dense and hot matter. We also estimate the rate of transfer of the black hole rotational energy to the bipolar jets. Finally, we elaborate on the nucleosynthesis of heavy elements in the accretion flow and the wind, through computations of the thermonuclear reaction network. We discuss the possible signatures of the radioactive elements decay in the accretion flow. We suggest that further detailed modeling of the accretion flow in GRB engine, together with its microphysics, may be a valuable tool to constrain the black hole mass and spin. It can be complementary to the gravitational wave analysis, if the waves are detected with an electromagnetic counterpart.

11 pages, 12 figures; accepted to ApJ

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• Origin of the Heaviest Elements: the Rapid Neutron-Capture Process
• The evolutionary roads leading to low effective spins, high black hole masses, and O1/O2 rates of LIGO/Virgo binary black holes
• Long-term GRMHD Simulations of Neutron Star Merger Accretion Disks: Implications for Electromagnetic Counterparts
• Neutrino-dominated accretion flows as the central engine of gamma-ray bursts
• Hyperaccreting Black Hole as Gamma-Ray Burst Central Engine. II. Temporal evolution of central engine parameters during Prompt and Afterglow Phases
• Shocks in the relativistic transonic accretion with low angular momentum
• Long-term 3D-MHD Simulations of Black Hole Accretion Disks formed in Neutron Star Mergers
• The r-process nucleosynthesis in the outflows from short GRB accretion disks
• The MRI imprint on the Short-GRB Jets
• Can MAD accretion disks launching structured jets explain both GRB and AGN engines? Magnetically arrested accretion disks launching structured jets in application to GRB and AGN engines
• Accretion in a dynamical spacetime and spinning up of the black hole in the gamma ray burst central engine
• Neutrino oscillations in a neutrino-dominated accretion disk around a Kerr BH
• Neutrino-Dominated Accretion Flows with Magnetic Prandtl Number-Dependent MRI-driven Turbulence
• Viscous torque in turbulent magnetized AGN accretion disks and its effects on EMRI's gravitational waves
• Numerical simulations of black hole accretion flows
• Simulations of black hole accretion torus in various magnetic field configurations