2014/09/30 by Johannes Noller · 12 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Cosmology and Gravitation Theories #Degrees of freedom (physics and chemistry) #Derivative (finance) #Diffeomorphism #Graviton #Kinetic energy #Kinetic term #Pulsars and Gravitational Waves Research #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2015/04/025
published in Journal of Cosmology and Astroparticle Physics 2015(04), 025 (Institute of Physics) · 24 pages, 8 figures
openalex publication_date 2015/04/17 · arxiv created 2015/04/20 · arxiv updated 2015/04/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The only known fully ghost-free and consistent Lorentz-invariant kinetic term for a graviton (or indeed for any spin-2 field) is the Einstein-Hilbert term. Here we propose and investigate a new candidate family of kinetic interactions and their extensions to derivative interactions involving several spin-2 fields. These new terms generically break diffeomorphism invariance(s) and as a result can lead to the propagation of 5 degrees of freedom for a single spin-2 field—analogous to ghost-free Massive Gravity. We discuss under what circumstances these new terms can be used to build healthy effective field theories and in the process establish the `Jordan' and `Einstein' frame pictures for Massive-, Bi- and Multi-Gravity.