Cosmological Heavy Ion Collisions:

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ATHIC_at_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
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Colliding Neutron Stars
BH

• M 1.5 solar mass
• R lt 15km
• A 1057
• composed of p, n, e, hyperons, quarks,

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Contents

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

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What is the GWR?
Ripples in the Fabric of the Space-Time
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Gravitational radiation
Einstein Field Equation
Linearized field equation
Wave Equation
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Gravitational radiation
Polarization amplitude for compact binary system
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• Gravitation Wave from Binary Neutron Star

B191316 Hulse Taylor (1975)
Effect of Gravitational Wave Radiation 1993
Nobel PrizeHulse Taylor
Taylor Weisberg
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• GW Sources
• - NS-BH, NS-NS, BH-BH mergers
• - Cosmological perturbations
• - Supernovae,
• Grav. wave pattern
• Urgent Demand For GW Detection !!

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Laser Interferometer Gravitational Wave
Observatory
LIGO I in operation (since
2004) LIGO II in progress (2014)
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Science 308 (2005) 939
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Gamma-Ray Burst
1970s Vela Satellite 1990s CGRO,
Beppo-SAX 2000s HETE-II, Swift
Duration milli sec - min
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Short-hard GRBs

• hard

• BATSE
• Sample

• No optical counterpart
• Origin
• Neutron star merger?
• Magnetar flare?
• Supernova?

• short

• long

• soft

• 1000

• 0.01

• 1

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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
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side remark

• All masses are lt 1.5 M?

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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?

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Neutron Star structure
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Neutron Star structure
Mass-Radius relation of Neutron Star
Calculated By C.Y. Ryu _at_ Sungkyunkwan Univ.
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Initial mass transfer rate
MBH3MSUN
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Mass transfer time scale
MBH3MSUN
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Mass transfer time scale
Proto-neutron
Kaon
Quark
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BH spin up (key to GRBs)
MBH3MSUN
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Polarization amplitude of GW

• Kaon model

• NP model

• Hyperon model

• Quark model

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Polarization amplitude(M?) after mass transfer
Quark model
Kaon model
2 times high
100 times short
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Frequency
Quark Star Kaon-NS
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Prospects
Cosmological Heavy Ion Collisions

• Colliding Neutron Stars - Possibility of
  probing NS EOS in GW GRBs.- At least, may be
  able to exclude some EOS.

Thank you !