Pulsars as a probe for the nuclear and quark matter equation of state
Pulsars as a probe for the nuclear and quark matter equation of state
Pulsars as a probe for the nuclear and quark matter equation of state
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X-Ray burster EXO 0748–676 <strong>and</strong> Quark Matter<br />
M<strong>as</strong>s M [M ]<br />
2.4<br />
2.0<br />
1.6<br />
1.2<br />
0.8<br />
Hybrid, mixed<br />
(CFL+APR)<br />
Quark star<br />
(QCD O(α s 2 ))<br />
Neutron star<br />
(DBHF)<br />
2σ<br />
EXO 0748-676<br />
Hybrid<br />
(2SC+DBHF)<br />
Hybrid<br />
(2SC+HHJ)<br />
0.4<br />
7 8 9 10 11 12 13 14 15<br />
Radius R [km]<br />
analysis <strong>of</strong> Özel (Nature 2006): M ≥ 2.10±0.28M ⊙ <strong>and</strong> R ≥ 13.8±1.8 km,<br />
claims: ’unconfined <strong>quark</strong>s do not exist at <strong>the</strong> center <strong>of</strong> neutron stars’!<br />
reply by Al<strong>for</strong>d, Bl<strong>as</strong>chke, Drago, Klähn, Pagliara, JSB (Nature 445, E7<br />
(2007)): limits rule out s<strong>of</strong>t <strong>equation</strong>s <strong>of</strong> <strong>state</strong>, not <strong>quark</strong> stars or hybrid stars!<br />
multiwavelength analysis <strong>of</strong> Pearson et al. (2006): data more consistent with<br />
M = 1.35M ⊙ than with M = 2.1M ⊙<br />
– p.26<br />
1σ
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