English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the implications of energy-dependence of the speed of photons,one of the candidate effects of quantum-gravity theories that has been moststudied recently, from the perspective of observations in different referenceframes. We examine how a simultaneous burst of photons would be measured by twoobservers with a relative velocity, establishing some associated conditions forthe consistency of theories. For scenarios where the Lorentz transformationsremain valid these consistency conditions allow us to characterize theviolations of Lorentz symmetry through an explicit description of themodification of the quantum-gravity scale in boosted frames with respect to itsdefinition in a preferred frame. When applied to relativistic scenarios with adeformation of Lorentz invariance that preserves the equivalence of inertialobservers, we find an insightful characterization of the necessity to adopt insuch frameworks non-classical features of spacetime geometry, e.g. events thatare at the same spacetime point for one observer cannot be considered at thesame spacetime point for other observers. Our findings also suggest that, atleast in principle (and perhaps one day even in practice), measurements of thedispersion of photons in relatively boosted frames can be particularly valuablefor the purpose of testing these scenarios.

Modifications to Lorentz invariant dispersion in relatively boosted frames