标题： 介质中的有效手征拉格朗日量和核物质中的介子质量 显示英文标题

标题： In-medium effective chiral lagrangians and the pion mass in nuclear matter

摘要： 我们认为，从手征有效拉格朗日量中得到的介子有效质量是唯一的，并且不依赖于介子场的非壳外扩展，例如PCAC选择。 在同位旋对称的核物质中，有效介子质量随着核密度的增加而略有增加，而有效类时介子衰变常数和密度相关的夸克凝聚量的大小则明显减少。 此外，还研究了介质中的Gell-Mann-Oakes-Renner关系以及其他介质中的恒等式。 最后，讨论了用于描述同位旋对称、各向同性和均匀核物质中介子传播的有效拉格朗日量的几个约束条件。 （在“Hirschegg '95: 核物质中的强子”研讨会上的报告，Hirschegg, Kleinwalsertal, 奥地利，1995年1月16日至21日） 显示英文摘要

摘要： We argue that the effective pion mass in nuclear matter obtained from chiral effective lagrangians is unique and does not depend on off-mass-shell extensions of the pion fields as e.g. the PCAC choice. The effective pion mass in isospin symmetric nuclear matter is predicted to increase slightly with increasing nuclear density, whereas the effective time-like pion decay constant and the magnitude of the density-dependent quark condensate decrease appreciably. The in-medium Gell-Mann-Oakes-Renner relation as well as other in-medium identities are studied in addition. Finally, several constraints on effective lagrangians for the description of the pion propagation in isospin symmetric, isotropic and homogenous nuclear matter are discussed. (Talk presented at the workshop ``Hirschegg '95: Hadrons in Nuclear Matter'', Hirschegg, Kleinwalsertal, Austria, January 16-21, 1995)