Non-homogeneity-driven universe acceleration

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

Acceleration of the Universe

The cosmological model best capable of fitting current observational data features two separate epochs during which the Universe is accelerating. During the earliest stages of the Universe, such acceleration is known as cosmological inflation, believed to explain the global properties of the Universe and the origin of structure. Observations of the present state of the Universe strongly suggest...

متن کامل

Can the Universe escape eternal acceleration ?

Recent astronomical observations of distant supernovae lightcurves, [1]-[4], suggest that the expansion of the universe has recently begun to accelerate. Acceleration is created by an antigravitational repulsive stress, like that produced by a positive cosmological constant, or universal vacuum energy. It creates a rather bleak eschatological picture. An ever-expanding universe’s future appears...

متن کامل

The Accelerated Acceleration of the Universe

We present a simple mechanism which can mimic dark energy with an equation of state w < −1 as deduced from the supernova data. We imagine that the universe is accelerating under the control of a quintessence field, which is moving up a very gently sloping potential. As a result, the potential energy and hence the acceleration increases at lower redshifts. Fitting this behavior with a dark energ...

متن کامل

Formation of Large Structures in the Acceleration Universe with a Hybrid Expansion Law

In the current paper, we have studied the effect of dark energy on for-mation where dark energy exists in the background. For this purpose, we used both WMAP9 and Planck data to study how the radius changes with redshift in these mod-els. We used different data sets to fix the cosmological parameters to obtain a solution for a spherical region under collapse. The mechanism of structure formation f...

متن کامل

Clustering in the Universe: from Highly Nonlinear Structures to Homogeneity

This chapter concentrates on a few specific topics concerning the distribution of galaxies on scales from 0.1 to nearly 1000 h Mpc . The main aim is to provide the reader with the information and tools to familiarize with a few basic questions: 1) What are the scaling laws followed by the clustering of luminous objects over almost four decades of scales; 2) How galaxy motions distort the observ...

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: Classical and Quantum Gravity

سال: 2001

ISSN: 0264-9381

DOI: 10.1088/0264-9381/18/14/303