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Cosmological Heavy Ion Collisions: Colliding Neutron Stars

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tacy
25 diapositives · 374 Views · Oct 23, 2014

This study delves into the phenomena of gravitational waves (GW) and gamma-ray bursts (GRB) stemming from colliding neutron stars and their implications for cosmology and astrophysics. We analyze scenarios involving neutron star-black hole systems, offering numerical results and insights into gravitational wave radiation as predicted by Einstein's equations. With advancements in GW detection technologies like LIGO, we aim to understand neutron star equations of state and their critical role in heavy-ion collisions, as well as explore potential sources of gravitational radiation.

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  1. ATHIC@Tsukuba Gravitational Waves & Gamma-Ray Bursts Cosmological Heavy Ion Collisions: Colliding Neutron Stars Chang-Hwan Lee Hee-Suk Cho Young-Min Kim Hong-Jo Park

  2. Colliding Neutron Stars BH • M = 1.5 solar mass • R < 15km • A = 10^57 • composed of p, n, e, hyperons, quarks, …

  3. Contents • Introduction to Gravitational Wave Radiation& Gamma-Ray Bursts • Colliding Neutron Star-Black Hole System • Numerical Result

  4. What is the GWR? Ripples in the Fabric of the Space-Time

  5. Gravitational radiation Einstein Field Equation Linearized field equation Wave Equation

  6. Gravitational radiation Polarization amplitude for compact binary system

  7. Gravitation Wave from Binary Neutron Star B1913+16 Hulse & Taylor (1975) Effect of Gravitational Wave Radiation 1993 Nobel PrizeHulse & Taylor Taylor & Weisberg

  8. GW Sources - NS-BH, NS-NS, BH-BH mergers - Cosmological perturbations - Supernovae, … • Grav. wave pattern: “Urgent Demand For GW Detection !!”

  9. Laser Interferometer Gravitational Wave Observatory LIGO I : in operation (since 2004) LIGO II: in progress (2014)

  10. Science 308 (2005) 939

  11. Gamma-Ray Burst 1970s : Vela Satellite 1990s: CGRO, Beppo-SAX 2000s: HETE-II, Swift Duration: milli sec - min

  12. Short-hard GRBs • hard • BATSE • Sample • No optical counterpart • Origin • Neutron star merger? • Magnetar flare? • Supernova? • short • long • soft • 0.01 • 1000 • 1

  13. Possible Sources for GWR & s-GRB NS (radio pulsar) which coalesce within Hubble time (in our galaxy, near earth) (2003)(2004) (1990) (2004) (1975) (1990)(2000) White Dwarf companion

  14. side remark • All masses are < 1.5 M⊙

  15. Candidates for Cosmological Heavy-Ion Collisions • NS-NS binaries : seen several • NS-BH binaries : some clues • BH-BH binaries : expected in globular clusters where old-dead stars (NS, BH) are populated. Wanted • Can we get some (or any) information on NS EOS (Equation of States) from GW & GRB?

  16. Neutron Star structure

  17. Neutron Star structure Mass-Radius relation of Neutron Star Calculated By C.Y. Ryu @ Sungkyunkwan Univ.

  18. Initial mass transfer rate MBH=3MSUN

  19. Mass transfer time scale MBH=3MSUN

  20. Mass transfer time scale Proto-neutron Kaon Quark

  21. BH spin up (key to GRBs) MBH=3MSUN

  22. Polarization amplitude of GW • Kaon model • NP model • Hyperon model • Quark model 2008 Nuclear Physics School

  23. Polarization amplitude(M⊙) after mass transfer Quark model Kaon model ~ 2 times high ~ 100 times short

  24. Frequency Quark Star Kaon-NS

  25. Cosmological Heavy Ion Collisions Prospects • Colliding Neutron Stars: - Possibility of probing NS EOS in GW & GRBs.- At least, may be able to exclude some EOS. Thank you !