EFFECTIVE GEOMETRY IN ASTROPHYSICS

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

ASTROPHYSICS Effective stability of the Trojan asteroids

We study the spatial circular restricted problem of three bodies in the light of Nekhoroshev theory of stability over large time intervals. We consider in particular the Sun-Jupiter model and the Trojan asteroids in the neighborhood of the Lagrangian point L 4. We find a region of effective stability around the point L 4 such that if the initial point of an orbit is inside this region the orbit...

متن کامل

Real Enumerative Geometry and Effective Algebraic Equivalence

Determining the common zeroes of a set of polynomials is further complicated over nonalgebraically closed fields such as the real numbers. A special case is whether a problem of enumerative geometry can have all its solutions be real. We call such a problem fully real. Little is known about enumerative geometry from this perspective. A standard proof of Bézout’s Theorem shows the problem of int...

متن کامل

From effective actions to the background geometry

We discuss how the background geometry can be traced from the one-loop effective actions in nonsupersymmetric theories in the external abelian fields. It is shown that after the proper identification of the Schwinger parameter the Heisenberg-Euler abelian effective action involves the integration over the AdS3, S3 and T ∗S3 geometries, depending on the type of the external field. The interpreta...

متن کامل

Astrophysics.

Using the oscillation frequencies of α Cen A recently discovered by Bouchy & Carrier (2001, 2002), the available astrometric, photometric and spectroscopic data, we tried to improve the calibration of the visual binary system α Cen. With the revisited masses of Pour-baix et al. (2002) we do not succeed to obtain a solution satisfying all the seismic observational constraints. Relaxing the const...

متن کامل

Generating Process Explanations in Nuclear Astrophysics Generating Explanations in Astrophysics

In this paper we describe ASTRA, a computational aid for generating process explanations in nuclear astrophysics. The system operates in two stages, the rst using knowledge of quantum theory to produce a set of legal reactions among elements and the second searching for pathways of such reactions that explain the evolution of some element in terms of lighter ones. ASTRA has found apparently nov...

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: International Journal of Modern Physics D

سال: 2004

ISSN: 0218-2718,1793-6594

DOI: 10.1142/s0218271804005705