Higuchi ghosts and gradient instabilities in bimetric gravity
نویسندگان
چکیده
منابع مشابه
No consistent bimetric gravity?
Two-tensor, bimetric (or ‘‘f-g’’) gravity (BMG) was born as the fusion of the strong-interaction resonances of the 1960s (specifically that of a massive spin 2 field) with general relativity’s (GR) massless metric [1]. The idea was to join the two symmetrically by giving each its own Einstein-Hilbert action, then coupling the two resulting ‘‘spaces’’ through a nonderivative ‘‘mass term’’ that n...
متن کاملSelf-accelerating Massive Gravity: Bimetric Determinant Singularities
Pierre Gratia,1, ∗ Wayne Hu,2, † and Mark Wyman2, 3, ‡ Department of Physics, University of Chicago, Chicago, Illinois 60637, U.S.A. Kavli Institute for Cosmological Physics, Department of Astronomy & Astrophysics, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, U.S.A. Center for Cosmology and Particle Physics, Department of Physics, New York University, New York, NY, 10...
متن کاملQuantum Gravity Without Ghosts
An outline is given of a recently discovered technique for building a quantum e ective action that is completely independent of gaugexing choices and ghost determinants. One makes maximum use of the geometry and brebundle structure of the space of eld histories and introduces a set of nonlocal composite elds: the geodesic normal elds based on Vilkovisky's connection on the space of histories. T...
متن کاملBimetric Models of Gravity and Cosmology in the Early Universe
In the last decades, we have witnessed an astonishing progress in our understanding of the Early Universe and its evolution into the actual con guration we observe. General Relativity has been a key ingredient for this achievement, and it certainly provides the correct way to couple matter elds to gravity. However, in other fundamental theories (string theory, for example), we can nd an immense...
متن کاملBimetric Truncations for Quantum Einstein Gravity and Asymptotic Safety
In the average action approach to the quantization of gravity the fundamental requirement of “background independence” is met by actually introducing a background metric but leaving it completely arbitrary. The associated Wilsonian renormalization group defines a coarse graining flow on a theory space of functionals which, besides the dynamical metric, depend explicitly on the background metric...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2015
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.91.104019