Arctan-Gravity Model

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

Arctan-Gravity Model

A new gravity model with the function F (R) = (1/β) arctan (βR− βR) instead of the Ricci scalar in the Einstein–Hilbert action, describing inflation of the Universe, is suggested and analyzed. We obtain constant curvature solutions of the model in the Jordan frame. Performing the conformal transformation of the metric, the potential and the mass of a scalar degree of freedom in the Einstein fra...

متن کامل

Inverse Trigonometric Functions Arctan and Arccot

For simplicity, we adopt the following convention: x, r, s, h denote real numbers, n denotes an element of N, Z denotes an open subset of R, and f , f1, f2 denote partial functions from R to R. The following propositions are true: (1) ]−π2 , π 2 [ ⊆ dom (the function tan). (2) ]0, π[ ⊆ dom (the function cot). (3)(i) The function tan is differentiable on ]−π2 , π 2 [, and (ii) for every x such t...

متن کامل

The Gravity Model and Iran's Trade Flows

This article has considered the volume and direction of Iran’s trade using the gravity model. The major issue in this analysis is to explore why Iran over or under-traded with the 76 countries relative to the predicted trade flows of the model. The study attempts to explore the reasons from the respect of both the model itself and Iran’s trade structure. This is done by analysing the performanc...

متن کامل

Studying Iranian Economic Integration with OIC Members Using Gravity Model

OIC members have much potential in their economic development. Therefore, their economic integration leads to more increment for partners and deal with global system as a unique organization. Consequently, studying the convergence of OIC members and their encountered challenges has especial importance which can assist the policy makers to develop their commercial relationship and consequent...

متن کامل

ℓ0-Norm Sparse Hyperspectral Unmixing Using Arctan Smoothing

Abstract: The goal of sparse linear hyperspectral unmixing is to determine a scanty subset of spectral signatures of materials contained in each mixed pixel and to estimate their fractional abundances. This turns into an `0-norm minimization, which is an NP-hard problem. In this paper, we propose a new iterative method, which starts as an `1-norm optimization that is convex, has a unique soluti...

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: Universe

سال: 2015

ISSN: 2218-1997

DOI: 10.3390/universe1010082