PION CONDENSATION BASED ON A RELATIVISTIC DESCRIPTION OF PARTICLE-HOLE AND DELTA-HOLE EXCITATIONS
PION CONDENSATION BASED ON A RELATIVISTIC DESCRIPTION OF PARTICLE-HOLE AND DELTA-HOLE EXCITATIONS
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基于粒子空穴和三角空穴激发相对论描述的π介子凝聚
DOI：
10.1142/s0218301301000605
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
A. Hasegawa
中科院分区：
文献类型：
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作者：
M. Nakano;T. Tatsumi;Liangtian Liu;H. Matsuura;T. Nagasawa;K. Makino;Kunito Tuchitani;Katsuaki Sakamoto;Yositaka Iwasaki;H. Kouno;A. Hasegawa
在相对论框架下重新研究了中性介子凝聚的临界密度，并与非相对论结果进行了比较。根据最近的实验数据，利用一组新的Landau-Migdal参数，用相对论方法计算了介子自能的粒子-空穴极化和增量-空穴极化。结果表明，在随机相近似下，相对论粒子空穴和增量空穴激发提高了介子的临界密度，但仍导致密度为正常核物质密度的2~3倍时的凝聚。
The critical density of neutral pion condensation is reinvestigated based on the relativistic framework and compared with nonrelativistic results. The particle-hole and delta-hole polarizations of the pion selfenergy are calculated in the relativistic way by using a new set of Landau–Migdal parameters derived from recent experimental data. It is concluded that the use of relativistic particle-hole and delta-hole excitations for the pion selfenergy increases the critical density, but still leads to condensation for densities from two to three times the normal nuclear matter density within the random phase approximation.