PIRSA:23020029 Scientific Series Strong Gravity

DOI10.48660/23020029

Series: Strong Gravity

Chirenti, C. (2023). Hypermassive neutron stars: from numerical relativity simulations to gamma-ray data. Perimeter Institute. https://pirsa.org/23020029

Chirenti, Cecilia. Hypermassive neutron stars: from numerical relativity simulations to gamma-ray data. Perimeter Institute, Mar. 09, 2023, https://pirsa.org/23020029 

@misc{ pirsa_PIRSA:23020029,
  doi = {10.48660/23020029},
  url = {https://pirsa.org/23020029},
  author = {Chirenti, Cecilia},
  keywords = {Strong Gravity},
  language = {en},
  title = {Hypermassive neutron stars: from numerical relativity simulations to gamma-ray data},
  publisher = {Perimeter Institute},
  year = {2023},
  month = {mar},
  note = {PIRSA:23020029 see, \url{https://pirsa.org}}
}

Abstract

Gamma ray bursts (GRBs) are the most luminous electromagnetic events in the universe. Short GRBs, typically lasting less than 2 seconds, have already been associated with binary neutron star (BNS) mergers, which are also sources of gravitational waves (GWs). The ultimate fate of a BNS, after coalescence, is usually expected to be a black hole (BH) with 2-3 solar masses. However, numerical relativity simulations indicate the possible formation of a short-lived hypermassive neutron star (HMNS), lasting for tens to hundreds of milliseconds after the BNS merger and before gravitational collapse forms a BH. The HMNS is expected to emit GWs with kHz frequencies that will be detectable by third generation ground-based GW detectors in the 2030s. I will present results from a recent analysis that revealed evidence for HMNSs by looking for kHz quasiperiodic oscillations in gamma-ray observations obtained in the 1990s with the Compton Gamma Ray Observatory.

Zoom link:  https://pitp.zoom.us/j/96687956901?pwd=MkgrUGlqY3IyRCs2bXJYVkhUVEpPZz09

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