Chameleon field theories
نویسندگان
چکیده
منابع مشابه
Quantum stability of chameleon field theories.
Chameleon scalar fields are dark-energy candidates which suppress fifth forces in high density regions of the Universe by becoming massive. We consider chameleon models as effective field theories and estimate quantum corrections to their potentials. Requiring that quantum corrections be small, so as to allow reliable predictions of fifth forces, leads to an upper bound m<0.0073(ρ/10 g cm(-3))(...
متن کاملTesting Chameleon Theories with Light Propagating through a Magnetic Field
Philippe Brax, Carsten van de Bruck, Anne-Christine Davis, David F. Mota, and Douglas Shaw 1 Service de Physique Théorique CEA/DSM/SPhT, Unité de recherche associée au CNRS, CEA-Saclay F-91191 Gif/Yvette cedex, France. 2 Department of Applied Mathematics, The University of Sheffield, Hounsfield Road, Sheffield S3 7RH, United Kingdom Department of Applied Mathematics and Theoretical Physics, Cen...
متن کاملNo-go theorems for generalized chameleon field theories.
The chameleon, or generalizations thereof, is a light scalar that couples to matter with gravitational strength, but whose manifestation depends on the ambient matter density. A key feature is that the screening mechanism suppressing its effects in high-density environments is determined by the local scalar field value. Under very general conditions, we prove two theorems limiting its cosmologi...
متن کاملBrans-Dicke Scalar Field as a Chameleon
In this paper it is shown that in Brans Dicke theory, if one considers a non-minimal coupling between the matter and the scalar field, it can give rise to a late time accelerated expansion for the universe preceded by a decelerated expansion for very high values of the Brans Dicke parameter ω.
متن کاملField Theories
We show agreements, at one-loop level of field theory, between energies of semiclassical string states on AdS 5 ×S 5 /Z M and anomalous dimensions of operators in N = 0, 1, 2 orbifold field theories originating from N = 4 SYM. On field theory side, one-loop anomalous dimension matrices can be regarded as Hamiltonians of spin chains with twisted boundary conditions. These are solvable by Bethe a...
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: Classical and Quantum Gravity
سال: 2013
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/30/21/214004