SKYRMIONS AT FINITE-TEMPERATURE

被引:7
作者
DEY, JS
EISENBERG, JM
机构
[1] School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University
关键词
D O I
10.1016/0370-2693(94)90690-4
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The existence of multiply-degenerate vacua in QCD introduces nonlinear, conformally-invariant modes (instantons). These persist at finite temperature T, where they are referred to as calorons. Atiyah and Manton have given a prescription that allows one to link instantons to skyrmions; the caloron is then a skyrmion at finite T We here study the free energy A(T) of this thermal skyrmion and find that, when temperature-independent parameters are used, A(T) decreases monotonically as T increases, so that no stable configuration is reached. Using a pion decay constant F(pi)(T) that is a function of temperature, as suggested by chiral perturbation theory, a maximum in the free energy is found at around T(c) = 160 MeV. We also study the N and DELTA masses for nonzero temperatures using the thermal skyrmion and find them to be appreciably changed from their values at T = 0.
引用
收藏
页码:290 / 294
页数:5
相关论文
共 32 条
[1]   STATIC PROPERTIES OF NUCLEONS IN THE SKYRME MODEL [J].
ADKINS, GS ;
NAPPI, CR ;
WITTEN, E .
NUCLEAR PHYSICS B, 1983, 228 (03) :552-566
[2]   SKYRMIONS FROM INSTANTONS [J].
ATIYAH, MF ;
MANTON, NS .
PHYSICS LETTERS B, 1989, 222 (3-4) :438-442
[3]   THE ROLE OF THE ENTROPY IN AN EXPANDING HADRONIC GAS [J].
BEBIE, H ;
GERBER, P ;
GOITY, JL ;
LEUTWYLER, H .
NUCLEAR PHYSICS B, 1992, 378 (1-2) :95-128
[4]   PSEUDOPARTICLE SOLUTIONS OF YANG-MILLS EQUATIONS [J].
BELAVIN, AA ;
POLYAKOV, AM ;
SCHWARTZ, AS ;
TYUPKIN, YS .
PHYSICS LETTERS B, 1975, 59 (01) :85-87
[5]   HOT NUCLEONS [J].
BERNARD, V ;
MEISSNER, UG .
ANNALS OF PHYSICS, 1991, 206 (01) :50-67
[6]   PIONS FROM RESONANCE DECAY IN BROOKHAVEN RELATIVISTIC HEAVY-ION COLLISIONS [J].
BROWN, GE ;
STACHEL, J ;
WELKE, GM .
PHYSICS LETTERS B, 1991, 253 (1-2) :19-22
[7]   THERMODYNAMICS OF MASSLESS QUARKS AND GLUONS - FINITE-SIZE HADRON FORMATION AND PHASE-TRANSITION TO THE QUARK-GLUON PLASMA STATE [J].
DEY, J ;
DEY, M ;
GHOSE, P .
PHYSICS LETTERS B, 1989, 221 (02) :161-166
[8]   DENSE, HOT QCD SUM-RULES FOR G-PI-NN [J].
DEY, J ;
DEY, M ;
GHOSE, P .
PHYSICS LETTERS B, 1985, 165 (1-3) :181-186
[9]   ON THE DENSITY AND TEMPERATURE INDEPENDENCE OF THE SKYRME PARAMETER IN THE NUCLEAR MEDIUM FROM QCD SUM-RULES [J].
DEY, J ;
DEY, M ;
GHOSE, P .
PHYSICS LETTERS B, 1987, 193 (01) :98-100
[10]  
DEY M, 1994, NUCLEAR PARTICLE PHY, pCH5