Cosmological perturbations in restricted f(R) gravity

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Cosmological perturbations from stochastic gravity

In inflationary cosmological models driven by an inflaton field the origin of the primordial inhomogeneities which are responsible for large-scale structure formation are the quantum fluctuations of the inflaton field. These are usually calculated using the standard theory of cosmological perturbations, where both the gravitational and the inflaton fields are linearly perturbed and quantized. T...

متن کامل

Study of a Restricted Modified Gravity on astrophysical and cosmological scales

p { margin-bottom: 0in; direction: rtl; text-align: right; }p.ctl { font-size: 12pt; }a:link { color: rgb(0, 0, 255); } In this paper, we study a restricted modified gravity in which diffeomorphism symmetry is broken. We investigate the astrophysical implications of the model by using the corresponding gravitational potential. By using the weight function of the weak lensing , for the model,...

متن کامل

Cosmological perturbations in a gravity with quadratic order curvature couplings

where Lm is the matter part Lagrangian. The gravitational field equation is presented in Eq. (2) of [1]. The oneloop order quantum correction generically leads to curvature-square terms, and due to Gauss-Bonnet theorem the two terms in Eq. (1) completely account such corrections, [3]. In the literature, many works analyzed the roles of R term in the context of cosmological structure formation, ...

متن کامل

Cosmological Perturbations and Non-Gaussianities in Hořava-Lifshitz Gravity

We investigate cosmological perturbations and non-gaussianities in Hořava-Lifshitz theory of gravitation. In the UV limit, the scalar perturbation in Hořava theory is naturally scale-invariant, ignoring the details of the expansion of the universe. Thus one may relax the exponential inflation and the slow-roll conditions for the inflaton field. Moreover, in the absence of slow-roll conditions, ...

متن کامل

Scale-invariant cosmological perturbations from Hořava-Lifshitz gravity without inflation

Based on the renormalizable theory of gravitation recently proposed by Hořava, we present a simple scenario to generate almost scale-invariant, super-horizon curvature perturbations. The anisotropic scaling with dynamical critical exponent z = 3 implies that the amplitude of quantum fluctuations of a free scalar field generated in the early epoch of the expanding universe is insensitive to the ...

متن کامل

ذخیره 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: 2017

ISSN: 2470-0010,2470-0029

DOI: 10.1103/physrevd.95.084009