Abstract
Abstract Recent studies of soft vibrational, tunneling and relaxational modes in glasses support the validity of the soft potential model, an extension of the tunneling model. The implications of this validity are investigated for the undercooled liquid. Using Condat and Jackle's treatment of the scattering from one-dimensional potentials, it is argued that the fast picosecond relaxation in the undercooled liquid is due to these modes and their damping. The significance of this result for current theories of the undercooled liquids is discussed.
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