兩味中性非均勻配對態(tài)色超導夸克的研究.pdf

1、華中師范大學碩士學位論文兩味中性非均勻配對態(tài)色超導夸克的研究姓名：孫薇申請學位級別：碩士專業(yè)：理論物理指導教師：侯德富20070501⑨碩士章住論文MASTER’STHESlSAbstractInthecoreofaNeutronstarthedensityofnuclearmatteriscompressedass泓eraltimesdenseasthenormalnuclearmatterbythegravitationalfiel

2、dAccordingtothebagmodel，thenucleonswilloverlaptoformquarkmatterQuantumChromodynamics(QCD)isregarded鸛thefundamentaltheoryofquarksandgluonswhichpredictsthatthequarkmatteratlowtemperatureandhighdensityiscolorsuperconductivi

3、ty(CSC)SotheresearchofCSCisimportantfortheexplorationofNeutronstarphysicsaswell嬲theseekingofquarkstarsinuniverseAsthelatticeQCDcan’tbeusedintheQCDofhighdensitytherearemainlytwoapproachestostudyCSC：(a)PerturbativeQCD(PQCD

4、)，whichissuitabletoquarkmatteratveryhighenergies，wheretheFermienergyofquarkmatterismuchlargerthanAQvoBecauseoftheasymptoticallyfreedomofQCDthecouplingisweakatveryhighdensityAndthepairingmechanisminthisconditionisthroughs

5、inglegluonexchange(b)NJLmodelItissuitabletomoderatebaryondensityregimewhichisthepossibledensityinthecoreofaNeutronstarAndtheFermienergyistwoOrthreetimesdensea8theA卵DThereliabilityofPQCDcalculationsisdi伍culttoestimateInth

6、eresearchofCSC，wehavetelyonNJLmodel，wherethepairingmechanismcomesfrominstantoneffectNonzerostrangequarkmassortherequirementofchargeneutralityinducesamismatchbetwecntheFermimomentaofthetwopairingquarks，thereforeCSChasvery

7、richphasestructures，includingGaplessphase，LOFFphasethemixphaseofBCSNORMALButtherearestilldisputiononthegroundstateofCSCquarkmatterThisarticlefocusesonthetwoflavorcolorsuperconductivityphaseatmoderatebaryondensityStarting

8、fromsu(2)NJLmodel，wedescribenumericallyaLOFFstatesatisfyingthecolorandelectricneutralityconditionsinweakcouplingregionwhereneithertheneutral2SCnorneutral92SCexist，WealsoshowthattheneutralLOFFisfreefromchromomagnetieinsta

9、bilitiesinweakcoupling，whereasinmiddlingcouplingregiontheneutralLOFFsuffersfromchromomagneticinstabilitiesDifferentfromtheidealCSC，theFermimomentumofthepairingquarksintheLOFFarenotequalForsuitablevaluesofthedifferenccsbe

10、tweenchemicolpotentialsCooperpairshavenonzerototalmomentumandeachofthetwoquarksinapaircanbeclosetoitsFermisurface，andsuchpalmcanbecreatedatlowcostinfreeenergyThethesisconsistsofthreepaft8ThefirstpartisabriefreviewofFinit