Date:
Tue, 03/12/202416:00-17:00
Speaker: Prof. Cecilia Chirenti (Federal University of ABC, Santo Andre, Brazil; Department of Astronomy, University of Maryland, USA)
Title: Quasi-periodic oscillations in short gamma-ray bursts and implications for neutron stars
Abstract:
Short gamma ray bursts (GRBs) have already been associated with binary neutron star mergers, which are also sources of gravitational waves. Numerical relativity simulations indicate that the merger can form a short-lived hypermassive neutron star (which could produce a millisecond magnetar), lasting for tens to hundreds of milliseconds before gravitational collapse forms a black hole. This neutron star remnant is expected to emit gravitational waves (GWs) with kHz frequencies that will be detectable by third generation ground-based GW detectors in the 2030s. Recently, kHz quasiperiodic oscillations were discovered in GRBs 910711 and 931101B, providing evidence for a hypermassive neutron star stage in these events. When analyzed together with new quasi-universal relations obtained from numerical relativity simulations, these detections provide a novel method to constrain the equation of state of the dense matter in neutron star cores.
Zoom link:
https://huji.zoom.us/j/83438422733?pwd=bO4fe7y4WgZ5OWdFjaUxulnbjurow1.1
Meeting ID: 834 3842 2733
Passcode: 294941
Contact: Dima Ofengeim
Title: Quasi-periodic oscillations in short gamma-ray bursts and implications for neutron stars
Abstract:
Short gamma ray bursts (GRBs) have already been associated with binary neutron star mergers, which are also sources of gravitational waves. Numerical relativity simulations indicate that the merger can form a short-lived hypermassive neutron star (which could produce a millisecond magnetar), lasting for tens to hundreds of milliseconds before gravitational collapse forms a black hole. This neutron star remnant is expected to emit gravitational waves (GWs) with kHz frequencies that will be detectable by third generation ground-based GW detectors in the 2030s. Recently, kHz quasiperiodic oscillations were discovered in GRBs 910711 and 931101B, providing evidence for a hypermassive neutron star stage in these events. When analyzed together with new quasi-universal relations obtained from numerical relativity simulations, these detections provide a novel method to constrain the equation of state of the dense matter in neutron star cores.
Zoom link:
https://huji.zoom.us/j/83438422733?pwd=bO4fe7y4WgZ5OWdFjaUxulnbjurow1.1
Meeting ID: 834 3842 2733
Passcode: 294941
Contact: Dima Ofengeim