cosmological heavy ion collisions: colliding neutron stars chang-hwan lee hee-suk cho young-min kim...
DESCRIPTION
Contents Introduction to Gravitational Wave Radiation & Gamma-Ray Bursts Colliding Neutron Star-Black Hole System Numerical ResultTRANSCRIPT
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Cosmological Heavy Ion Collisions:Colliding Neutron Stars
Chang-Hwan Lee Hee-Suk Cho
Young-Min Kim Hong-Jo Park
ATHIC@Tsukuba
Gravitational Waves & Gamma-Ray Bursts
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Colliding Neutron Stars
M = 1.5 solar mass R < 15km A = 10^57 composed of p, n, e, hyperons, quarks, …
BH
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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
''
)',/'(4 34 xd
xxxcxxtT
ch
fg
Thff )21(
Tc
GRgRG 4
821
Wave Equation
0 h
Einstein Field Equation
Linearized field equation
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Gravitational radiation
000000000000
)(2''
)',/'(44
'34 hh
hhcrtQ
rcGxd
xxxcxxtT
ch ij
xrxx
)(2cos)1(
4)( 24
22rt
acMG
rth
Polarization amplitude
for compact binary system
4
2
5
5
5
4
5
153251
aM
cG
QQcGL ijijGW
4
2
2/75
2/92/7
)1(532
acMGJGW
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Gravitation Wave from Binary Neutron Star
Effect of Gravitational Wave Radiation 1993 Nobel PrizeHulse & Taylor
B1913+16 Hulse & Taylor (1975)
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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11
Gamma-Ray Burst
Duration: milli sec - min
1970s : Vela Satellite
1990s: CGRO, Beppo-SAX
2000s: HETE-II, Swift
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23/05/04 12
Short-hard GRBshard
soft
short long
100010.01
No optical counterpart Origin
Neutron star merger? Magnetar flare? Supernova?
BATSESample
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NS (radio pulsar) which coalesce within Hubble time (in our galaxy, near earth)
(1975)
(1990)
(2003)(2004)
(2004)
(1990)(2000)
White Dwarf companion
Possible Sources for GWR & s-GRB
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• All masses are < 1.5 M⊙
side remark
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Wanted Can we get some (or any) information
on NS EOS (Equation of States) from GW & GRB?
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.
Candidates for Cosmological Heavy-Ion Collisions
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Neutron Star structure
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Neutron Star structure
0 2 4 6 8 10 12 14 160.0
0.5
1.0
1.5
2.0
Mas
s(M
⊙)
Radius(km)
Hyperon Kaon np quark
Calculated By C.Y. Ryu @ Sungkyunkwan Univ.
Mass-Radius relation of Neutron Star
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Initial mass transfer rate
18
MBH=3MSUN
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Mass transfer time scale
19
MBH=3MSUN
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Mass transfer time scale
20
Proto-neutron
Kaon
Quark
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BH spin up (key to GRBs)
21
MBH=3MSUN
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2008 Nuclear Physics School
Kaon model NP model
Hyperon model Quark model
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~ 2 times high
Polarization amplitude(M⊙) after mass transfer
~ 100 times short
Kaon model Quark model
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Frequency
Quark Star
Kaon-NS
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Prospects
Colliding Neutron Stars: - Possibility of probing NS EOS in GW & GRBs.- At least, may be able to exclude some EOS.
Cosmological Heavy Ion Collisions
Thank you !