這論文是關於非理想anyon氣體中的聲波的探討。我們首先回顧了朗道
(Landau)的費裡流體唯象理論中的第一聲和零聲，與及近理想條件下兩者
的速度比。接下來簡介anyon系統的fractional statistics。在文章的最
後部份我們嘗試把朗道的唯象理論方法應用在非理想anyon氣體，並定性
地球出氣體中存在零聲激發的條件。

This is an investigation on the acoustic excitations in non-
ideal anyon gas. We first review the zero sound and first sound
in Landau Fermi liquid phenomenology, and the ratio of their
velocities under the weak interaction limit. Then we go on to
introduce the fractional statistics of anyonic system.Lastly we
try to apply Landau's phenomenology on the non-ideal anyon gas,
and find the condition of the existence of zero sound
qualitatively.
This is an investigation on the acoustic excitations in non-