Beyond Zeldovich‐Type Approximations in Gravitational Instability Theory: Pade Prescription in Spheroidal Collapse

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

Vacuum instability and gravitational collapse

We argue that (0, 1) heterotic string models with 4 non-heterotic spacetime dimensions may provide an instability of the vacuum to gravitational polarization in globally strong gravitational fields. This instability would be triggered during gravitational collapse by a nonlocal quantum switching process, and lead to the formation of regions of a high temperature broken symmetry phase which woul...

متن کامل

ACCURACY OF NONLINEAR APPROXIMATIONS IN SPHEROIDAL COLLAPSE — Why are Zel ’ dovich - type approximations so good ? —

ABSTRACT Among various analytic approximations for the growth of density fluctuations in the expanding Universe, Zel’dovich approximation and its extensions in Lagrangian scheme are known to be accurate even in weakly non-linear regime. The aim of this paper is to investigate the reason why these Zel’dovich-type approximations work accurately beyond the linear regime from the following two poin...

متن کامل

On Gravitational Collapse in the Nonsymmetric Gravitational Theory

The analytical structure of the difference between the static vacuum solution in the nonsymmetric gravitational theory (NGT) and the Schwarzschild solution of Einstein’s gravitational theory (EGT) is studied. It is proved that a smooth matching of the solutions does not exist in the range 0 < r ≤ 2M , for any non-zero values of the parameters M and s of the NGT solution. This means that one can...

متن کامل

Stellar Equilibrium and Gravitational Collapse in the Nonsymmetric Gravitational Theory

We establish the formalism in the nonsymmetric gravitational theory (NGT) for stellar equilibrium and gravitational collapse. We study the collapse of a pressureless, spherically symmetric dust cloud. By assuming that the interior solution is smoothly matched at the surface of the star to the quasi-static, spherically symmetric vacuum solution, we find that the star does not collapse to a black...

متن کامل

Non-linear Approximations to Gravitational Instability: a Comparison in Second-order Perturbation Theory

Nonlinear approximation methods such as the Zeldovich approximation, and more recently the frozen flow and linear potential approximations, are sometimes used to simulate nonlinear gravitational instability in the expanding Universe. We investigate the relative accuracy of these approximations by comparing them with the exact solution using second order perturbation theory. We evaluate the dens...

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: The Astrophysical Journal

سال: 1998

ISSN: 0004-637X,1538-4357

DOI: 10.1086/306085