Problems of massive gravities
2015 (English)In: Modern Physics Letters A, ISSN 0217-7323, E-ISSN 1793-6632, Vol. 30, no 3-4, 1540006Article in journal (Refereed) Published
The method of characteristics is a key tool for studying consistency of equations of motion; it allows issues such as predictability, maximal propagation speed, superluminality, unitarity and acausality to be addressed without requiring explicit solutions. We review this method and its application to massive gravity (mGR) theories to show the limitations of these models' physical viability: Among their problems are loss of unique evolution, superluminal signals, matter coupling inconsistencies and micro-acausality (propagation of signals around local closed time-like curves (CTCs)/closed causal curves (CCCs)). We extend previous no-go results to the entire three-parameter range of mGR theories. It is also argued that bimetric models suffer a similar fate.
Place, publisher, year, edition, pages
2015. Vol. 30, no 3-4, 1540006
Massive gravity, characteristics, acausality, superluminality, ghost modes
IdentifiersURN: urn:nbn:se:su:diva-115278DOI: 10.1142/S0217732315400064ISI: 000348992500007OAI: oai:DiVA.org:su-115278DiVA: diva2:799823