95 research outputs found
Concerning the existence of Einstein and Ricci soliton metrics on solvable Lie groups
In this work we investigate solvable and nilpotent Lie groups with special
metrics. The metrics of interest are left-invariant Einstein and algebraic
Ricci soliton metrics. Our main result shows that the existence of a such a
metric is intrinsic to the underlying Lie algebra. More precisely, we show how
one may determine the existence of such a metric by analyzing algebraic
properties of the Lie algebra in question and infinitesimal deformations of any
initial metric.
Our second main result concerns the isometry groups of such distinguished
metrics. Among the completely solvable unimodular Lie groups (this includes
nilpotent groups), if the Lie group admits such a metric, we show that the
isometry group of this special metric is maximal among all isometry groups of
left-invariant metrics. We finish with a similar result for locally
left-invariant metrics on compact nilmanifolds.Comment: 28 page
Bayesian curve fitting for lattice gauge theorists
A new method of extracting the low-lying energy spectrum from Monte Carlo
estimates of Euclidean-space correlation functions which incorporates Bayesian
inference is described and tested. The procedure fully exploits the information
present in the correlation functions at small temporal separations and uses
this information in a way consistent with fundamental probabilistic hypotheses.
The computed errors on the best-fit energies include both statistical
uncertainties and systematic errors associated with the treatment of
contamination from higher-lying stationary states. Difficulties in performing
the integrals needed to compute these error estimates are briefly discussed.Comment: 7 pages, 6 figures, 2 tables, uses espcrc2. Talk presented at the
Workshop on Lattice Hadron Physics, Colonial Club Resort, Cairns, Australia,
July 9-18, 200
DATA STRUCTURE WITH RESPECT TO THE MAIN EFFECTS MODEL: A DISCUSSION MOTIVATED BY A META-ANALYSIS DATA SET
A discussion on data structure relative to the main effects model is motivated by a severely unbalanced meta-analysis data set. This data set is used to highlight the difficulty of assessing data structure when multiple factor data sets are severely unbalanced. Both theoretical results and numerical examples are used to establish that simple approaches to examining data structure using two-way tables provide easily assimilated information about the effect of data unbalance on main effect contrast variances. In addition, notions of balance, proportionality, unbalance, and missing cells with respect to the main effects model are defined in terms of the two-way tables and are related to main effect contrast estimate variances as assessed using the D-optimality criterion
In Vitro Characterization of Ephedrine-Related Stereoisomers at Biogenic Amine Transporters and the Receptorome Reveals Selective Actions as Norepinephrine Transporter Substrates
Multimedia data definition and requirements for construction applications
Ph.D.Nelson C. Bake
Alternative Methods of Regression
Of related interest. Nonlinear Regression Analysis and its Applications Douglas M. Bates and Donald G. Watts ".an extraordinary presentation of concepts and methods concerning the use and analysis of nonlinear regression models.highly recommend[ed].for anyone needing to use and/or understand issues concerning the analysis of nonlinear regression models." --Technometrics This book provides a balance between theory and practice supported by extensive displays of instructive geometrical constructs. Numerous in-depth case studies illustrate the use of nonlinear regression analysis--with all data
Flow control in a multichamber settling basin by sluice gates driven by a CFD and an ancillary analytical model
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