Revisiting the hot matter in the center of gamma-ray bursts and supernovae

Abstract

Aims. Hot matter with nucleons can be produced in the inner region of the neutrino-dominated accretion flow in gamma-ray bursts or during the proto-neutron star birth in successful supernovae. The composition and equation of state of the matter depend on the dynamic β equilibrium under various neutrino opacities. The strong interaction between nucleons may also play an important role. We plan to extend the previous studies by incorporating these two aspects in our model. Methods. The modification of the β-equilibrium condition from neutrino optically thin to thick was modeled by an equilibrium factor χ ranging between the neutrino-freely-escaping case and the neutrino-trapped case. We employed the microscopic BruecknerHartree-Fock approach extended to the finite temperature regime to study the interacting nucleons. Results. We show the composition and chemical potentials of the hot nuclear matter for different densities and temperatures at each stage of β equilibrium. We also compare our realistic equation of states with those of the free-gas model. We find that it is important to properly describe the neutrino opacity and the strong interaction between nucleons, and they should be taken into account in model calculations.

Vertical Convection in Neutrino-Dominated Accretion Flows

“…Neutrino radiation is the main cooling mechanism, possibly having the ability to power GRBs via neutrino annihilation outside of the disk. In past decades much work has been done onthis model, all of which can be divided into the following categories: (i) research on the stable or timedependent radial characteristics of the disk, such as the dynamics, structure, components, and luminosity of the NDAF model (see, e.g., Popham et al 1999;Narayan et al 2001;Di Matteo et al 2002;Kohri & Mineshige 2002;Janiuk et al 2004Janiuk et al , 2007Kohri et al 2005;Lee et al 2005;Gu et al 2006;Chen & Beloborodov 2007;Kawanaka & Mineshige 2007;Liu et al 2007;Kawabata et al 2008;Zhang & Dai 2009;Kawanaka et al 2013;Li & Liu 2013;Xue et al 2013) or the magnetic NDAF model (e.g., Lei et al 2009;Janiuk & Yuan 2010;Luo et al 2013); (ii) corresponding applications to GRBs observations (e.g., Reynoso et al 2006;Lei et al 2007;Lazzati et al 2008;Liu et al 2010bLiu et al , 2012bRomero et al 2010;Kawanaka & Kohri 2012;Sun et al 2012;Hou et al 2014aHou et al , 2014b; (iii) research on the vertical characteristics of the model and the application of these characteristics to observations (e.g., Sawyer 2003;Liu et al 2008Liu et al , 2010aLiu et al , 2012aLiu et al , 2013Liu et al , 2014…”

Neutrino-dominated accretion flows as the central engine of gamma-ray bursts

“…The steady radial structure and neutrino luminosity of BH NDAFs are most widely studied (see e.g, Popham et al 1999;Narayan et al 2001;Di Matteo et al 2002;Kohri & Mineshige 2002;Kohri et al 2005;Lee et al 2005;Gu et al 2006;Chen & Beloborodov 2007;Liu et al 2007;Janiuk et al 2007;Rossi et al 2008;Janiuk & Yuan 2010;Kawanaka & Mineshige 2007;Kawanaka et al 2013b;Li & Liu 2013;Luo & Yuan 2013;Xue et al 2013). After the first work of Popham et al (1999), Di Matteo et al (2002) recalculated the NDAF radial structure by taking into account neutrino opacity with Newtonian potential.…”

“…Li & Liu (2013) revisited various properties of the hot nuclear matter possible in the inner regions of GRBs and supernovae (SNe). They employed the microscopic BruecknerHartree-Fock approach to account for the strong interaction between nucleons, and calculated the nucleonic chemical potentials and the nucleonic EoS.…”

Nucleosynthesis from neutrino-dominated accretion disks in gamma-ray bursts and its application

“…A popular model for the central engine in gamma-ray bursts (GRBs) is based on the so-called neutrinodominated accretion flow (NDAFs, see, e.g., [1][2][3][4][5][6][7][8][9][10][11][12]). NDAF involves a hyperaccreting stellar black hole with mass accretion rates in the range ofṁ = 0.01 ∼ 10 (ṁ =Ṁ/M s −1 ).…”