黄梅 Mei Huang Paramagnetic Meissner Effect in the g2SC Phase Mei Huang 黄梅 Collaborate with I. Shovkovy ``The QCD-phase diagram”, Skopelos, May 29 – June.

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Presentation transcript:

黄梅 Mei Huang Paramagnetic Meissner Effect in the g2SC Phase Mei Huang 黄梅 Collaborate with I. Shovkovy ``The QCD-phase diagram”, Skopelos, May 29 – June 2, 2004 Institute for Theoretical Physics, Frankfurt University

黄梅 Mei Huang QCD Phase Diagram: from weak to strong coupling Based on T.Hatsuda’s talk BCS TcTc (1.5-2) T c BEC Crossover from BCS to BEC ? Strongly interacting matter GSI? M.H, S. Scherer, H. Weber, M. Bleicher, H. Stoecker

黄梅 Mei Huang It is possible that CS exists in the core of compact stars Charge neutrality ! 1.Global charge neutrality: mixed phase M. Buballa, I. Shovkovy, M. Hanauske, M.H Phys.Rev.D67:103004, Local charge neutrality: homogeneous phase g2SC: M. H., P.F. Zhuang, W.Q. Chao Phys.Rev.D67: ,2003 I. Shovkovy, M.H Phys.Lett.B564:205,2003 M.H, I. Shovkovy Nucl.Phys.A729:835,2003

黄梅 Mei Huang Whether Cooper pairing will be destroyed by mismatch?

黄梅 Mei Huang urur ugug ubub dgdg drdr dbdb - equilibrium :

黄梅 Mei Huang  SU(2) NJL Model

黄梅 Mei Huang

Whether there is still Cooper pairing ?

黄梅 Mei Huang

Gluon self-energy in g2SC M.H., I. Shovkovy, hep-ph/0406…, will appear in arXiv

黄梅 Mei Huang Debye Mass: Meissner Mass:

黄梅 Mei Huang Special properties of g2SC 1. Pairing quarks have different number densities at T=0 2. Finite temperature properties: nonmonotonic behavior not a BCS ratio

黄梅 Mei Huang 1-3 gluons 8 gluon 4-7 gluons

黄梅 Mei Huang 1-3 gluons8 gluon 4-7 gluons Meissner Masses for the 8th gluon and 4th-7th are negative!!!

黄梅 Mei Huang Meissner Effect How to understand the minus sign?

黄梅 Mei Huang Why Meissner Effect in regular superconductor ? Response function: related to matter’s properties External Field Induced current

黄梅 Mei Huang Paramagnetic current and diamagnetic current 1.Normal metal free eletrons 2.Superconductor BCS pair, gap parameter Perfect Diamagnet

黄梅 Mei Huang 3. Paramagnetic Meissner Effect Mesoscopic superconductors: a) A loop made of three crystals of HTSC; b) Aluminium disc

黄梅 Mei Huang in small superconductors Nature 396, (1998); doi: /24110 mixed state of Y–Ba–Cu–O ceramics Low Temperature Physics (1996) -- V22, J. Phys.: Condens. Matter 9 (1997) L525-L531 …...

黄梅 Mei Huang Paramagnetic contribution Paramagnetic contributions

黄梅 Mei Huang Summary 1.Cold-dense charge neutral 2-flavor quark matter at intermediate coupling region is in g2SC phase, it is a thermal stable state. 2.Unstable chromo-magnetic gluon modes appear in g2SC phase. Paramagnetic Meissner effect ! Spontaneous magnetization ? Need gluon condensate to stabilize ?