Lorentz invariance and quantum gravity: An additional fine-tuning problem?

John Collins, Alejandro Perez, Daniel Sudarsky, Luis Urrutia, Héctor Vucetich

Research output: Contribution to journalArticlepeer-review

262 Scopus citations


The elementary particle interactions with a Planck-scale preferred frame, which gives rise to Lorentz violation and are unnaturally strongly fine tuned, were investigated. It was found that direct investigations of Planck-scale phenomena need short-wavelength probes with elementary-particle energies of order the Planck energy Ep = (hc5/G)1/2 = 1.2 x 1019 GeV. The preferred frame and the consequent Lorentz violation occurred even though the fundamental classical equations of both of the theories were locally Lorentz invariant. The results show that the Lorentz violation can be removed by explicit Lorentz-violating counterterms that are fine tuned to give the observed low-energy Lorentz invariance.

Original languageEnglish (US)
Article number191301
Pages (from-to)191301-1-191301-4
JournalPhysical review letters
Issue number19
StatePublished - Nov 5 2004

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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