1、Color Superconductivity: Recent developments,Qun WangDepartment of Modern PhysicsChina University of Science and TechnologyQuark Matter 2006, Shanghai Nov 2006,Outline,Some concepts of CSCNeutrino emissions in CSCBCS-BEC crossover in CSC,QCD: From Paradox to Paradigm,David J. Gross H. David Politzer
2、 Frank Wilczek,for the discovery of asymptotic freedom in the theory of the strong interaction,The Nobel Prize in Physics 2004,Color Confinement,Yang-Mills and Mass gap- A Millenium Problem ($1,000,000) Clay Mathematics Institute- Officially described by A. Jaffe & E. Witten,DeConfinement: Quark Mat
3、ter, Compress & heat nuclear matter: formation of QM, QM in our Universe Compact Star First few seconds after big bang,Dense Quark Matter,High-T Quark Matter,T.D. Lee, 74; Stoecker et al., 74Collins & Perry, 75,QCD phase diagram,Quark Matter in Compact Star,F. Weber, astro-ph/007155,Typical energy s
4、cale: gap,Dissipation free: small perturbation cannot excite system,Spin-zero pairings,2-flavor SC (2SC)Bailin, Love (1984),Color-flavor-locking (CFL)Alford, Rajagopal,Wilczek (1984),Spin-one pairings,Polar phaseSchafer (2000),Color-spin-locking (CSL)Bailin, Love (1984)Schafer (2000),Unconventional
5、pairings,Pairings between quarks with non-equal Fermi momentaSee Mei Huangs talk,Neutrino emissions in CSC,Neutrino processes in quark matter,Direct Urcafast,Modified-Urcaslow,Neutrino processes in quark matter,Bremstrahlungslow,Cooling curve for NS,F. Weber, 2005;Prakashs Talk,Phase space for Urca,
6、 QW, Wang and Wu, PRD 2006 ,Fermi liquid properties open up phase space for neutrino emissions in Urca (valid for normal and super state), Iwamoto 1984 ,Gaps in S=0 are large leading to slow cooling; Alford et al, 2005; Anglani et al, 2006Normal state: fast cooling;Gaps in S=1 are small right to des
7、cribe data. Schafer, 2000; Schmitt, Wang, Rischke, 2003,Neutrino emissivity for S=1 CSC,Spatial Asymmetry in neutrino emissions in A phase,Schmitt, Shovkovy, WangPRL(2005),Neutrino emissivity in S=1 phases,Asymptotic form,Schmitt, Shovkovy, QW, PRD(2005)QW, Wang and Wu, PRD(2006),BCS-BEC crossover i
8、n relativistic superfluid,Superfluids:Weak and Strong Couplings,Science,BEC, strong couplings,BCS, weak couplings,BCS-BEC crossover in relativistic superfluids: fermion-boson model,fermions,Bosons: di-fermions,NJL models:Nishida, Abuki, 2005Abuki, 2006,Results: T=0,BCS-BEC crossover parameterA type
9、of scattering length,Results: T=Tc,Results: particle fractions vs T/Tc,Results: at unitary limit,In agreement with results of cold atomic system:Physics at unitary limit independent of details of interactions,Cold atomic system:Carlson, Reddy, 2005; Nishida, Son, 2006; Rupak, Schafer, Kryjevski, 200
10、6,Unitary limit x=0:,Summary,CSC is a developing area in particle and nuclear physicsDriven by recent findings at RHIC, strongly coupled CSC will be the next direction to goSearching for signals of CSC in compact star and high baryon region in heavy ion collisions are the future goal Randups talk, but it is as challenging as to pin down QGP,
