Results 31 to 40 of about 1,053,175 (373)
Scalar perturbations of non-singular non-rotating black holes in conformal gravity [PDF]
, 2017 We study scalar and electromagnetic perturbations of a family of nonsingular nonrotating black hole spacetimes that are solutions in a large class of conformally invariant theories of gravity.
B. Toshmatov +4 more
semanticscholar +1 more source
Five new methods of celestial mechanics
AIMS Mathematics, 2020 The last volume of the book “Les méthods nouvelles de la mécanique céleste” by Poincaré [28] was published more than 120 years ago. Since then, the following methods have arisen. 1.
Alexander Bruno
doaj +1 more source
Cosmological Perturbations Through a Non-Singular Ghost-Condensate/Galileon Bounce [PDF]
, 2014 We study the propagation of super-horizon cosmological perturbations in a non-singular bounce spacetime. The model we consider combines a ghost condensate with a Galileon term in order to induce a ghost-free bounce.
Battarra, Lorenzo +3 more
core +3 more sources
Root System of Singular Perturbations of the Harmonic Oscillator Type Operators [PDF]
Letters in Mathematical Physics, 2013 We analyze perturbations of the harmonic oscillator type operators in a Hilbert space H\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs ...
B. Mityagin, P. Siegl
semanticscholar +1 more source
Asymptotics of the Solution of Bisingular Problem for a System of Linear Parabolic Equations. I
Моделирование и анализ информационных систем, 2013 Given a bisingular parabolic problem for a system of linear parabolic equations, we construct an asymptotics for the solution of any order with respect to a small parameter, without using the joining procedure for asymptotic expansions.
M. V. Butuzova
doaj +1 more source
Primordial perturbations in a non singular bouncing universe model [PDF]
, 2002 We construct a simple non singular cosmological model in which the currently observed expansion phase was preceded by a contraction. This is achieved, in the framework of pure general relativity, by means of a radiation fluid and a free scalar field ...
A. Albrecht +71 more
core +3 more sources
AIMS Mathematics, 2023 In this paper, the finite-time stability (FTS) of singular switched systems that have time-varying delays and perturbations is investigated. First, the concept of the FTS of time-varying delay singular switched systems is given, and a specific event ...
Yidan Wang, Li Xiao , Yanfeng Guo
doaj +1 more source
Perturbation of the Ground Varieties of C = 1 String Theory [PDF]
, 1993 We discuss the effect of perturbations on the ground rings of $c=1$ string theory at the various compactification radii defining the $A_N$ points of the moduli space.
Ghoshal, Debashis +2 more
core +2 more sources
Holographic interpretation of renormalization group approach to singular perturbations in nonlinear differential equations [PDF]
, 2013 We give a holographic explanation of how the renormalization group approach to singular perturbations in nonlinear differential equations proposed by Chen, Goldenfeld, and Oono is indeed equivalent to a renormalization group method in quantum field ...
Y. Nakayama
semanticscholar +1 more source
Cosmological Perturbations from the No Boundary Euclidean Path Integral [PDF]
, 1999 We compute, from first principles, the quantum fluctuations about instanton saddle points of the Euclidean path integral for Einstein gravity coupled to a scalar field.
A. Linde +25 more
core +2 more sources