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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The Lorentz-violating model proposed by Myers and Pospelov suffers from ahigher-derivative pathology due to a dimension-5 operator. In particular, itselectromagnetic sector exhibits an spectrum which contains, in addition to anexpected massless photon, ghost contributions that could (in principle) spoilthe unitarity of the model. We find that unitarity at tree-level can be assuredfor pure spacelike, timelike and lightlike background four-vectors (the lasttwo under restrictions upon the allowed momenta). We then analyze thenon-relativistic interparticle potential energy behavior for differentbackground four-vectors and compare to the usual Coulomb potential.

Unitarity and non-relativistic potential energy in a higher-order Lorentz symmetry breaking electromagnetic model