18-22 September 2017
Yerevan, Armenia
Etc/GMT+4 timezone

Pulsar glitch dynamics in general relativity

22 Sep 2017, 09:00
40m
Yerevan, Armenia

Yerevan, Armenia

Department of Physics, Alex Manoogian str. 1, Yerevan, Armenia

Speaker

Jerome Novak (CNRS - Observatoire de Paris)

Description

Pulsar glitches are commonly interpreted as angular momentum transfers occurring between two fluids present in the stellar interior, triggered by the rapid motion of superfluid vortex lines at large scales. We consider for the first time all general relativistic effects in a numerical model for glitches. First, we show numerical calculation of stationary configurations of neutron stars composed of a neutron superfluid and a fluid made of charged particles, spinning with different rotation rates. These general relativistic calculations are based on realistic equations of state accounting for entrainment effects between the fluids. These configurations are then used to build a numerical model for pulsar glitches in full general relativity. In particular, we study in details the characteristic time scale associated with the spin-up stage, during which the stellar dynamics are governed by a mutual friction force arising from the interactions between the superfluid vortices and the surrounding fluids. Taking general relativity into account leads to an additional coupling between the fluids through frame-dragging effects and is shown to affect significantly the actual value of the spin-up time scale.

Type of contribution Talk

Primary authors

Mr Aurelien Sourie (LUTH, CNRS - Observatoire de Paris) Jerome Novak (CNRS - Observatoire de Paris) Mrs Micaela Oertel (LUTH, CNRS - Observatoire de Paris)

Presentation Materials