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Recently measured VHE gamma ray spectra from supernovae remnants (SNRs) arebest fit by power laws with an exponential cutoff. But this feature does notoccur at the `knee-equivalent' energy at which VHE gamma ray spectra areexpected to reflect the `knee' in the otherwise featureless cosmic rayspectrum. In this article, the VHE gamma ray feature is explained as aconsequence of a recently deduced quantum effect. The effect distinguishes`trajectory energy' from `particle state energy' and requires that the particlestate energy depends strongly on gravitational potential at very high energies.Based on this effect and the observed CR spectrum, a tight two-parameter fit isobtained to the combined VHE gamma ray spectra of SNRs RX J1713.7-3946 and RXJ0852.0-4622 and the Galactic Center ridge.

On the Very-High-Energy Gamma Ray Spectra from Typical Supernovae Remnants