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The nature of compressed baryonic matter. Renxin Xu ( 徐仁新 ) School of Physics, Peking University ( ) Pulsar searching and timing with FAST “ PKU Astrophysics Colloquium 2012 ” Oct. 21, 2012; Biejing. Compressed baryonic matter http :// vega.bac.pku.edu.cn/ rxxu R . X. Xu. Summary. - PowerPoint PPT Presentation
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The nature of compressed baryonic matter
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
Renxin Xu (徐仁新 )School of Physics, Peking University
( )
Pulsar searching and timing with FAST“PKU Astrophysics Colloquium 2012”
Oct. 21, 2012; Biejing
Introduction: what’s compressed BM?
EoS of compressed BM: specu. & obs.
To understand EoS by large telescope
Conclusions
Summary
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
1
Introduction: what’s compressed BM?
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
color number 1 1 3 3electricity 0 -1 +2/3 -1/3
1st generation e e u(2-8MeV) d(5-15MeV)2nd generation c(~1GeV) s(~200MeV)3rd generation t(~100GeV) b(~4GeV)
Leptons Quarks(mass)
Higgs Boson
13 Totally: 62
48
Strong electro-magn. Weak gravityGauge Boson gluon photon W, Z graviton
Spin 1 1 1 2number 8 1 3 1
• What is baryon: the standard model of particle physics
Baryon (a quark) = 1/3
The particle has been the subject of a 45-year hunt to explain how matter attains its mass.
5!
Introduction: what’s compressed BM?
~100 cm ~10-8 cm ~10-13 cm
...
. {uud} {udd}
A brief history about compressed baryonic matter …• G. Gamow (~1930): incompressible liquid drop for atomic nuclei• L. Landau (1932, before n): what if drops are concentrated by
gravity?• Landau’s idea of “gigantic nucleus” develops to normal NS model...• What if the quark degree of freedom (and w & s int.) is not
negligible? our answer: {u, d, s}, > 6 (rather than 3) grouped in a cluster in CBM.Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
A rubbermade of NM/SM
All of theworld's population
Introduction: what’s compressed BM?
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
Introduction: what’s compressed BM?
EoS of compressed BM: specu. & obs.
To understand EoS by large telescope
Conclusions
Summary
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
EoS of compressed BM: specu. & obs.
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
• EoS of compressed BM: the mainstream …Alford (2004)
coupling between quarks?… DSE approach of NQCD
A quark clustering phase?
? Clustering ← BEC ← BCS
Xu 2009, JPG, 36, 064010
EoS of compressed BM: specu. & obs.
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
~ (1, 10) kmconventional neutron star quark-cluster star
• Gravity-bound (weak binding) vs. Self-bound (strong)• Atmosphere vs. {q-clusters, electron sea}
• Differences between NS & quark-cluster star?
(Heiselberg, 2000) (Xu, 2011)
EoS of compressed BM: specu. & obs.
Metal ball V.S. Quark-cluster star
ions/nuclei
E-M interaction strong/color one
quark clusters
• A quark-cluster star looks like a big metal ballEoS of compressed BM: specu. & obs.
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
• A realistic quark cluster: H-dibaryon?H-particles in lattice QCD:Beane et al. [NPLQCD Collaboration], Phys. Rev. Lett. 106, 162001 (2011)Inoue et al. [HAL QCD Collaboration], Phys. Rev. Lett. 106, 162002 (2011)
What if quarks are clustered as H-diabaryons in QS?Lai, Gao & Xu (arXiv:1107.0834)
Interaction between H’s is mediated by - mesons:
In-medium stiffening effect: Brown-Rho scaling modified.
EoS of compressed BM: specu. & obs.
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
• A realistic quark cluster: H-star?
M-R, M-c
Mmax-V0
EoS of compressed BM: specu. & obs.
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
• A corresponding-state approach to …EoS of compressed BM: specu. & obs.
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
Wilczek (2007)
• Dimensionless parameters:
• Corresponding state law EoS
• The results (Guo, Lai & Xu; arXiv1209.3688):
Introduction: what’s compressed BM?
EoS of compressed BM: specu. & obs.
To understand EoS by large telescope
Conclusions
Summary
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
To understand EoS by large telescope
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
1, Timing (ToA): spin-behavior + space-time fluctuations + post-Newtonian orbital effects + binary parameter + ISM + planetary ephemeris + time standards/navigation?
2, Pulse profile: radiative process (magnetospheric activity) + ISM
• Key observables of radio pulsars
Large radio FAST telescopes are certainly necessary to measure precisely these two.
• To measure the mass of radio pulsars• To measure the inertial of momentum of NS• To find sub-ms radio pulsars• …
To understand EoS by large telescope
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
• To know compressed BM by large telescope
(Sala et al. ApJ, arXiv:1204.3627)
Lai & Xu (2009, Nq = 18, U0 = 100 MeV)
(Lai & Xu 2009 MNRAS, 398, L31)
Demorest et al. (2010)
PSR J1614
To understand EoS by large telescope
Introduction: what’s compressed BM?
EoS of compressed BM: specu. & obs.
To understand EoS by large telescope
Conclusions
Summary
Compressed baryonic matter http://vega.bac.pku.edu.cn/rxxu R. X. Xu
Conclusions• Pulsars are not only extreme labs of gravity, but also of the fundamental strong interaction.
• As manifestation of compressed baryonic matter, pulsars are sending us message being essential for us to know non-perturbative QCD.
• We are suggesting: realistic compressed baryonic matter at a few nuclear densities is composed by quark-cluster matter.Thanks!
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