Planck-scale modifications to Electrodynamics characterized by a space-like symmetry-breaking vector - General Relativity and Quantum CosmologyReport as inadecuate




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Abstract: In the study of Planck-scale -quantum-gravity induced- violations ofLorentz symmetry, an important role was played by the deformed-electrodynamicsmodel introduced by Myers and Pospelov. Its reliance on conventional effectivequantum field theory, and its description of symmetry-violation effects simplyin terms of a four-vector with nonzero component only in the time-direction,rendered it an ideal target for experimentalists and a natural concept-testingground for many theorists. At this point however the experimental limits on thesingle Myers-Pospelov parameter, after improving steadily over these past fewyears, are -super-Planckian-, {\it i.e.} they take the model out of actualinterest from a conventional quantum-gravity perspective. In light of this wehere argue that it may be appropriate to move on to the next level ofcomplexity, still with vectorial symmetry violation but adopting a genericfour-vector. We also offer a preliminary characterization of the phenomenologyof this more general framework, sufficient to expose a rather significantincrease in complexity with respect to the original Myers-Pospelov setup. Mostof these novel features are linked to the presence of spatial anisotropy, whichis particularly pronounced when the symmetry-breaking vector is space-like, andthey are such that they reduce the bound-setting power of certain types ofobservations in astrophysics.



Author: Giulia Gubitosi, Giuseppe Genovese, Giovanni Amelino-Camelia, Alessandro Melchiorri

Source: https://arxiv.org/



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