Pre-critical Chiral Fluctuations in Nuclear Medium -- precursors of chiral restoration at $\rho_{B}\not=0 --

Abstract

It is shown that an enhancement in the spectral function near 2$m_{\pi }$ threshold in the I=J=0 channel is a good signal of the partial restoration of chiral symmetry in nuclear medium. Several experiments are discussed to detect the enhancement, which uses hadron-nucleus and photo-nucleus reactions.

Comments: The figure caption of Fig.1 is corrected