Results 31 to 40 of about 1,812,515 (147)

The Real and Redshift Space Density Distribution Function for Large-Scale Structure in the Spherical Collapse Approximation [PDF]

open access: yes, 2001
We use the spherical collapse (SC) approximation to derive expressions for the smoothed redshift-space probability distribution function (PDF), as well as the $p$-order hierarchical amplitudes $S_p$, in both real and redshift space.
Baugh   +23 more
core   +4 more sources

General boundary quantum field theory: Timelike hypersurfaces in Klein-Gordon theory [PDF]

open access: yes, 2005
We show that the real massive Klein-Gordon theory admits a description in terms of states on various timelike hypersurfaces and amplitudes associated to regions bounded by them. This realizes crucial elements of the general boundary framework for quantum
M. Abramowitz, R. Jackiw, Robert Oeckl
core   +1 more source

Relevance Feedback using Genetic Algorithm on Information Retrieval for Indonesian Language Documents

open access: yesJournal of Information Systems Engineering and Business Intelligence, 2019
Background: The Rapid growth of technological developments in Indonesia had resulted in a growing amount of information. Therefore, a new information retrieval environment is necessary for finding documents that are in accordance with the user’s ...
Salman Dziyaul Azmi, Retno Kusumaningrum
doaj   +1 more source

An orbit determination method of spacecraft based on distribution regression

open access: yesOpen Astronomy, 2021
A new method of orbit determination (OD) is proposed: distribution regression. The paper focuses on the process of using sparse observation data to determine the orbit of the spacecraft without any prior information. The standard regression process is to
Jiang Chunsheng
doaj   +1 more source

Sensitivity analysis of spacecraft in micrometeoroids and orbital debris environment based on panel method

open access: yesDefence Technology, 2023
To reduce the risk of mission failure caused by the MM/OD impact of the spacecraft, it is necessary to optimize the design of the spacecraft. Spacecraft survivability assessment is the key technology in the optimal design of spacecraft.
Di-qi Hu   +3 more
doaj   +1 more source

Bi-exact groups, strongly ergodic actions and group measure space type III factors with no central sequence

open access: yes, 2016
We investigate the asymptotic structure of (possibly type III) crossed product von Neumann algebras $M = B \rtimes \Gamma$ arising from arbitrary actions $\Gamma \curvearrowright B$ of bi-exact discrete groups (e.g.
Houdayer, Cyril, Isono, Yusuke
core   +1 more source

A View on Optimal Transport from Noncommutative Geometry

open access: yesSymmetry, Integrability and Geometry: Methods and Applications, 2010
We discuss the relation between the Wasserstein distance of order 1 between probability distributions on a metric space, arising in the study of Monge-Kantorovich transport problem, and the spectral distance of noncommutative geometry.
Francesco D'Andrea, Pierre Martinetti
doaj   +1 more source

Turbulence, representations, and trace-preserving actions

open access: yes, 2008
We establish criteria for turbulence in certain spaces of C*-algebra representations and apply this to the problem of nonclassifiability by countable structures for group actions on a standard atomless probability space (X,\mu) and on the hyperfinite ...
Kerr, David, Li, Hanfeng, Pichot, Mikael
core   +2 more sources

Relativistic Schrödinger equation and probability currents for free particles

open access: yesPracì Mìžnarodnogo Geometričnogo Centru
In this work, we start from the problem of quantizing the relativistic Hamiltonian of a free massive particle (rest mass different from 0), a problem exceptionally difficult in the standard approaches to quantum mechanics.
David Carfì
doaj   +1 more source

Generalized Green Functions and current correlations in the TASEP

open access: yes, 2011
We study correlation functions of the totally asymmetric simple exclusion process (TASEP) in discrete time with backward sequential update. We prove a determinantal formula for the generalized Green function which describes transitions between positions ...
A. Borodin   +28 more
core   +1 more source

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