Thermal effects on the condensates of chiral order parameters, and g, and chiral restoration from lattice QCD
✍ Scribed by Takumi Doi; Noriyoshi Ishii; Makoto Oka; Hideo Suganuma
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 286 KB
- Volume
- 129-130
- Category
- Article
- ISSN
- 0920-5632
No coin nor oath required. For personal study only.
✦ Synopsis
We study the quark-gluon mixed condensate g(fja,,G,,q) using the SU(3), lattice QCD with the Kogut-Susskind fermion at the quenched level. We perform the first but a,ccurate measurement of the thermal effects on the mixed condensate in lattice QCD at p = 6.0 with 163 x Nt (Nt = 16,12,10,8,6,4); /3 = 6.1 with 203 x Nt (Nt = 20,12,10,8,6), and p = 6.2 with 243 x Nt (Nt = 24,16,12,10,8).
At each temperature, the lattice calculation is carried out with high statistics using more than 100 gauge configurations.
In particular, about 1000 gauge configurations are used near the critical temperature T,. The chiral extrapolation is done from the lattice result with the current-quark mass of mp = 21,36,52MeV. While the thermal effects on both of g(tjo,,G,,q) and ( 94) are very weak except for the vicinity of T,, both the condensa,tes suddenly vanish around T, N 280MeV, which indicates strong chiral restoration near T,. To compare the thermal effects on the two condensates, we ana.lyze the ratio rni E g{qc,,G,,q)/(tjq), and find that rng is almost independent of the temperature, even in the very vicinity of T,. This means that these two different condensates obey the same critical behavior, and this nontrivial similarity between them would impose constraints on the chiral structure of the QCD vacuum nea,r T,.