$$f(R)$$ f ( R ) gravity: scalar perturbations in the late Universe
نویسندگان
چکیده
منابع مشابه
Friedmann Equations of FRW Universe in Scalar - tensor Gravity , f ( R ) Gravity and First Law of
In the paper, hep-th/0501055 (R. it is shown that by applying the first law of thermodynamics to the apparent horizon of an FRW universe and assuming the geometric entropy given by a quarter of the apparent horizon area, one can derive the Friedmann equations describing the dynamics of the universe with any spatial curvature; using the entropy formula for the static spherically symmetric black ...
متن کاملCurvature scalar instability in f(R) gravity
An instability in the presence of matter in theories of gravity which include a 1/R correction in the gravitational action has been found by Dolgov and Kawasaki. In the present paper this instability is discussed for f(R) gravity in general. We focus on the Palatini formalism of the theory and it is shown that no such instability occurs in this version of f(R) gravity. The reasons for the appea...
متن کاملf(R) gravity and scalar-tensor theory
In the present paper we will investigate the relation between scalar-tensor theory and f(R) theories of gravity. Such studies have been performed in the past for the metric formalism of f(R) gravity; here we will consider mainly the Palatini formalism, where the metric and the connections are treated as independent quantities. We will try to investigate under which circumstances f(R) theories o...
متن کاملCovariant Gauge Invariant Theory of Scalar Perturbations in f(R)- Gravity: A Brief Review
I review the state of the art of the investigation on the structure formation in f(R)-gravity based on the Covariant and Gauge Invariant approach to perturbations. A critical analysis of the results, in particular the presence of characteristic signature of these models together with their meaning and their implication, is given.
متن کاملFriedmann Equations of FRW Universe in Scalar - tensor Gravity , f ( R ) Gravity and First Law of Thermodynamics
In the paper, hep-th/0501055 (R. it is shown that by applying the first law of thermodynamics to the apparent horizon of an FRW universe and assuming the geometric entropy given by a quarter of the apparent horizon area, one can derive the Friedmann equations describing the dynamics of the universe with any spatial curvature; using the entropy formula for the static spherically symmetric black ...
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: The European Physical Journal C
سال: 2014
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-014-3005-1