| Project/Area Number |
61460019
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
核・宇宙線・素粒子
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
FUKUGITA Masataka Research Institute for Fundamental Physics, Kyoto University, 基礎物理学研究所, 助教授 (40100820)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
UKAWA Akira Institute of Physics, University of Tsukuba, 物理学系, 助教授 (10143538)
|
|---|
| Project Period (FY) |
1986 – 1987
|
| Project Status |
Completed (Fiscal Year 1987)
|
| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥2,300,000 (Direct Cost: ¥2,300,000)
|
|---|
| Keywords | lattice gauge theory / quantum chromodynamics / quark confinement / chiral phase transition / Langevin simulation / 相転移 / 確率量子化 / ランジュヴァン方程式 / 確率量子化法 / Langevin方程式 / 数値シミュレーション / 強粒子分光学 / クォーク解放相転移 |
|---|
| Research Abstract |
Full QCD (quantum chromodynamics) simulation was carried out using the Langevin method developed by the present investigator in 1984 - 1985 with the main result that:
(1) The first-order deconfining phase transition of pure gauge theory weakens when quarks are coupled to the system. When the mass of quark decreases, however, a first-order phase transition recovers as a chiral phase transition, which at two sauce time causes the quark liberation.
(2) The effect of dynamical degrees of freedom of quark fields largely modifies hadron masses with a lattice out-off. The effect however, is reabsorbed with the shift of initial parameters of the theory and the physical result does not differ from the one obtained with quenched approximation, where the effect of quark fields to gauge fields are switched off. This underlies the success of hadron mass calculation in the quenched approximation.
|
