  The recent theoretical treatment of irreversible jumps between inherent
states with a constant density in shear space is extended to a full theory,
attributing the shear relaxation to structural Eshelby rearrangements involving
the creation and annihilation of soft modes. The scheme explains the Kohlrausch
exponent close to 1/2 and the connection to the low temperature glass
anomalies. A continuity relation between the irreversible and the reversible
Kohlrausch relaxation time distribution is derived. The full spectrum can be
used in many ways, not only to describe shear relaxation data, but also to
relate shear relaxation data to dielectric and bulk relaxation spectra, and to
predict aging from shear relaxation data, as demonstrated for a very recent
aging experiment.
