Results 1 to 10 of about 688,478 (251)

Quasi-Normal Modes of Stars and Black Holes [PDF]

open access: yesLiving Reviews in Relativity, 1999
Perturbations of stars and black holes have been one of the main topics of relativistic astrophysics for the last few decades. They are of particular importance today, because of their relevance to gravitational wave astronomy.
Kokkotas Kostas, Schmidt Bernd
doaj   +6 more sources

On New Modifications of Some Perturbation Procedures

open access: yesDiscrete Dynamics in Nature and Society, 2021
In this paper, we present new modifications for some perturbation procedures used in mathematics, physics, astronomy, and engineering. These modifications will help us to solve the previous problems in different sciences under new conditions. As problems,
A. I. Ismail
doaj   +2 more sources

XXII. An improved solution of a problem in physical astronomy; by which, swiftly converging series are obtained, which are useful in computing the perturbations of the motions of the Earth, Mars, and Venus, by their mutual attraction. To which is added an appendix, containing an easy method of obtaining the sums of many slowly converging series which arise in taking the fluents of binominal surds, &c. In a letter to the Rev. Nevil Maskelyne, D. D. F. R. S. and Astronomer Royal [PDF]

open access: closedPhilosophical Transactions of the Royal Society of London
Reverend Sir, Such is the subject of the inclosed paper, and such the repu­tation for skill and industry, which the many valuable papers you have communicated to the Royal Society, and your other learned works, have justly procured to you, that it could not with more propriety be submitted to the judgment of any other person than yourself,
John Hellins
openaire   +2 more sources

Modification of the Large Parameter Approach for the Periodic Solutions of Nonlinear Dynamical Systems

open access: yesMathematics, 2023
This paper focuses on the modification of the large parameter approach (LPA), a novelty procedure, for estimating the periodic solutions of two degrees-of-freedom (DOF) autonomous quasi-linear systems with a first integral.
A. I. Ismail, T. S. Amer, W. S. Amer
doaj   +1 more source

Close Binary Stars Modeled by Two Prolate Ellipsoids in Synchronous Rotation

open access: yesThe Astronomical Journal, 2023
The presence of tidal deformations in close binary stars has already been confirmed by astronomical observations. The present paper aims to simply address an astronomy problem, studying the relative movement of close binaries disturbed by their mutual ...
Antonio Elipe   +3 more
doaj   +1 more source

Leonhardi Euleri Opera omnia: Editing the works and correspondence of Leonhard Euler [PDF]

open access: yesPrace Komisji Historii Nauki PAU, 2015
The paper gives an overview on the history and present state of the edition of the complete works of Leonhard Euler (1707–1783). After several failed initiatives in the 19th century, the project began in 1907 with the edition of Euler’s printed works ...
Andreas KLEINERT
doaj   +1 more source

Rotochemical Heating of Neutron Stars: Rigorous Formalism with Electrostatic Potential Perturbations [PDF]

open access: yesThe Astrophysical Journal, 2006
The electrostatic potential that keeps approximate charge neutrality in neutron star matter is self-consistently introduced into the formalism for rotochemical heating presented in a previous paper by Fernandez and Reisenegger. Although the new formalism is more rigorous, we show that its observable consequences are indistinguishable from those of the ...
Reisenegger, Andreas   +3 more
openaire   +7 more sources

On the solar origin of interplanetary disturbances observed in the vicinity of the Earth [PDF]

open access: yesAnnales Geophysicae, 2003
The solar origin of 40 interplanetary disturbances observed in the vicinity of the Earth between January 1997 and June 1998 is investigated in this paper.
N. Vilmer   +4 more
doaj   +1 more source

One-dimensional, surface emitting, disordered Terahertz lasers

open access: yesAPL Photonics, 2020
Quantum cascade lasers are, by far, the most compact, powerful, and spectrally pure sources of radiation at terahertz frequencies, and, as such, they are of crucial importance for applications in metrology, spectroscopy, imaging, and astronomy, among ...
Luca Salemi   +6 more
doaj   +1 more source

Fast Magnetosonic Waves Driven by Gravitational Waves [PDF]

open access: yes, 2001
The propagation of a gravitational wave (GW) through a magnetized plasma is considered. In particular, we study the excitation of fast magnetosonic waves (MSW) by a gravitational wave, using the linearized general-relativistic hydromagnetic equations. We
Andersson   +27 more
core   +3 more sources

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