This book provides a succinct overview of recent progress in characterization of heat carriers
describing atomic motion in liquids. Unlike solids and gases where heat carriers are typically
described by phonons and real atomic particles the nature of effective heat carriers in
liquids is still elusive. The emphasis is on two widely used spectral methods to describe heat
carriers: instantaneous normal modes and velocity autocorrelation functions. Various bulk
materials properties from a bottom-up perspective using these spectra are presented in detail.
This book is an ideal introduction to the field for graduate students and young researchers.
