  We attempt to calculate the point separated Noise Kernel for self similar
Tolman Bondi metric, using a method similar to that developed by Eftekharzadeh
et. al for ultra-static spacetimes referring to the work by Page. In case of
formation of a naked singularity, the Noise Kernel thus obtained is found to be
regular except on the Cauchy horizon, where it diverges. The behavior of the
noise in case of the formation of a covered singularity is found to be regular.
This result seemingly renders back reaction non-negligible which questions the
stability of the results obtained from the semiclassical treatment of the self
similar Tolman Bondi metric.
