Phase space solutions in scalar-tensor cosmological models

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

Phase Space Solutions in Scalar-Tensor Cosmological Models

An analysis of the solutions for the field equations of generalized scalar-tensor theories of gravitation is performed through the study of the geometry of the phase space and the stability of the solutions, with special interest in the Brans-Dicke model. Particularly, we believe to be possible to find suitable forms of the BransDicke parameter ω and potential V of the scalar field, using the d...

متن کامل

Phase space geometry in scalar-tensor cosmology

We study the phase space of spatially homogeneous and isotropic cosmology in general scalar-tensor theories. A reduction to a two-dimensional phase space is performed when possible — in these situations the phase space is usually a twodimensional curved surface embedded in a three-dimensional space and composed of two sheets attached to each other, possibly with complicated topology. The result...

متن کامل

Cosmological models in scalar tensor theories of gravity and observations: a class of general solutions

Aims. To study cosmological models in scalar tensor theories of gravity with power law potentials as models of an accelerating universe. Methods. We consider cosmological models in scalar tensor theories of gravity that describe an accelerating universe, and we study a family of inverse power law potentials, for which exact solutions of the Einstein equations are known. We also compare theoreti...

متن کامل

Scaling solutions in scalar-tensor cosmologies

The possibility of a connection between dark energy and gravity through a direct coupling in the Lagrangian of the underlying theory has acquired an increasing interest due to the recently discovered capability of the extended quintessence model to encompass the fine-tuning problem of the cosmological constant. The gravity induced “R-boost” mechanism is indeed responsible for an early, enhanced...

متن کامل

Scalar Perturbations in Deflationary Cosmological Models

We consider scalar perturbations of energy–density for a class of cosmological models where an early phase of accelerated expansion evolves, without any fine–tuning for graceful exit, towards the standard Friedman eras of observed universe. The geometric procedure which generates such models agrees with results for string cos-mology since it works if dynamics is dominated by a primordial fluid ...

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: Brazilian Journal of Physics

سال: 2005

ISSN: 0103-9733

DOI: 10.1590/s0103-97332005000700004