Stefano Liberati

Constraining Planck scale Lorentz violations via photon absorption: an exemplar case of quantum gravity phenomenology

In this talk I shall discuss the constraints that can be derived from the observation of photon absorption in the radiation emitted from distant objects like Mkn 501. This investigation shows some novel properties of reactions in the presence of Lorentz violation and the determinations of the constraints arises conceptual problems that are typical of quantum gravity phenomenology. In this sense photon absorption can serve as an exemplar case in showing the challenges that this kind of studies poses to researcher.
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