f(R)gravity and chameleon 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 کاملBoom Chameleon
We introduce the Boom Chameleon, a novel input/output device consisting of a flat-panel display mounted on a tracked mechanical boom. The display acts as a physical window into 3D virtual environments, through which a one-to-one mapping between real and virtual space is preserved. The Boom Chameleon is further augmented with a touch-screen and a microphone/speaker combination. We present a 3D a...
متن کاملChameleon Hashing and Signatures
We introduce chameleon signatures that provide with an undeniable commitment of the signer to the contents of the signed document (as regular digital signatures do) but, at the same time, do not allow the recipient of the signature to disclose the contents of the signed information to any third party without the signer's consent. These signatures are closely related to \undeniable signatures", ...
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: 2008
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.78.104021