Constraints from cosmic rays on non-systematic Lorentz violation

Details Constraints from cosmic rays on non-systematic Lorentz violation Constraints from cosmic rays on non-systematic Lorentz violation

2005-01-20

arxiv.org/abs/astro-ph/0501425v2

Class.Quant.Grav. 22 (2005) 3029-3044

Astronomy and Astrophysics

Astrophysics

17 pages. References added, minor typos fixed. Matches published version

Scientific paper

10.1088/0264-9381/22/14/012

In this article we analyze the radiation loss from a high energy cosmic ray proton propagating in a spacetime with non-systematic Lorentz violation. From an effective field theory perspective we illuminate flaws in previous attempts that use threshold approaches to analyze this problem. We argue that in general such approaches are of rather limited use when dealing with non-systematic Lorentz violating scenarios. The main issues we raise are a) the limited applicability of threshold energy conservation rules when translation invariance is broken and b) the large amounts of proton particle production due to the time dependence of the fluctuations. Ignoring particle production, we derive a constraint on the magnitude of velocity fluctuation $|v_f|<10^{-6.5}$, much weaker than has been previously argued. However, we show that in fact particle production makes any such constraint completely unreliable.

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