Results 221 to 230 of about 3,130,649 (266)

Initial conditions for natural inflation

Physical Review D, 1993
We investigate the issue of initial conditions for natural inflation in a homogeneous universe. Unlike many inflationary models, the pseudo Nambu-Goldstone boson nature of the inflaton field provides a natural measure for the phase space of initial conditions.
, Knox, , Olinto
openaire   +2 more sources

Correction of the Initial Conditions

2015
This chapter presents a general approach to deal with the correction of the initial conditions at the position and velocity levels. This procedure is of paramount importance to avoid constraints violation during the numerical resolution of the equations of motion.
openaire   +2 more sources

SMOOTHING WITH AN UNKNOWN INITIAL CONDITION

Journal of Time Series Analysis, 2003
Abstract.The smoothing filter is appropriately modified for state space models with an unknown initial condition. Modifications are confined to an initial stretch of the data. An application illustrates procedures.
De Jong, Piet, Chu-Chun-Lin, Singfat
openaire   +1 more source

Initial Conditions and Boundary Conditions

1994
High-resolution limited-area models have been successfully used for both the simulation and prediction of regional and local mesoscale weather events (Anthes et al. 1989). This success can depend on accurately specifying the initial state of the atmosphere and its variation in time along the lateral boundaries of the model domain. Synoptic-scale global
Keith D. Sashegyi, Rangarao V. Madala
openaire   +1 more source

Conditional learning control for alignment initial condition

International Journal of Systems Science, 2012
This article tries to handle the alignment initial condition for contraction mapping based iterative learning control, such that the system can operate continuously without any initial condition reset. This goal is achieved for a class of nonlinear systems through the proposed conditional learning control, which has several advantages over the ...
Zaiyue Yang, Che Wai Chan
openaire   +2 more sources

Initial Conditions

2007
Abstract Laws of Nature tell us how things change. Yet behind them we believe there to lurk invariances that straitjacket reality. Nature can do whatever she pleases so long as these charmed quantities stay the same throughout the change.
openaire   +1 more source

Mechanisms of conditioned meal initiation

Physiology & Behavior, 1989
Three experiments investigate behavioral and biological mechanisms of meal initiation controlled by learning. Animals were classically conditioned to initiate a meal in response to a conditioned stimulus paired with food. We demonstrate that: a) aversion to the signalled food markedly reduces consumption but has no effect on eating-related behaviors ...
H P, Weingarten, G M, Martin
openaire   +2 more sources

Initial conditions for extended inflation

Physical Review D, 1989
The wave function of the Universe is calculated for an inflationary cosmological model with a variable gravitational ''constant.'' The resulting probability distribution for the initial states of the Universe is peaked at the highest maximum of the effective potential, /ital V/=/ital V//sub max/, with the initial value of the Planck mass /ital M//sub ...
, del Campo S, , Vilenkin
openaire   +2 more sources

Initial conditions of a stringy universe

Physical Review D, 1988
The ground-state functional corresponding to a closed bosonic string is derived by using the path-integral approach for the simple compact topology of a finite cylinder. This functional integral satisfies the ''no boundary'' Hartle-Hawking prescription and, therefore, we consider it as a candidate to describe the quantum state of the very early ...
openaire   +2 more sources

Initial conditions and differential equations

SIMULATION, 1987
A new method to investigate initial conditions induced by the application of step commands in linear or nonlinear systems is given in this note.
openaire   +1 more source