- #1
petergreat
- 267
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The almost simultaneous detection of low energy and high energy photons puts tight constraints on models predicting linear dependence of c on E. But it's very far from ruling out quadratic dependence. My question is, why do Lorentz-violating theories commonly predict linear rather than quadratic relation between c and E? A quadratic dependence might arise, for example, if f = Sin[k/k_planck], in which case the group velocity df/dk is a Cos which only shows quadratic deviation from 1 for small angles.
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