Search
Now showing items 171-180 of 1390
Utilising optimised operators and distillation to extract scattering phase shifts
(Proceedings of Science, 2016-01-01)
In this investigation, we examine how the precision of energy spectra and scattering phase shifts, extracted in lattice QCD, depend upon the degree of distillation type smearing. We use the variational method to extract ...
Non-diagonal four-dimensional cohomogeneity-one Einstein metrics in various signatures
(ElsevierDifferential Geometry and its Application, 2016-11-11)
Most known four-dimensional cohomogeneity-one Einstein metrics are diagonal in a basis defined by the left-invariant one-forms, though some essentially non-diagonal ones are known. We consider the problem of explicitly ...
Mathematical imaging methods for mitosis analysis in live-cell phase contrast microscopy
(ElsevierMethods, 2017-02-15)
In this paper we propose a workflow to detect and track mitotic cells in time-lapse microscopy image sequences. In order to avoid the requirement for cell lines expressing fluorescent markers and the associated phototoxicity, ...
On the equal-mass limit of precessing black-hole binaries
(Institute of PhysicsClassical and Quantum Gravity, 2017-03-23)
We analyze the inspiral dynamics of equal-mass precessing black-hole binaries using multi-timescale techniques. The orbit-averaged post-Newtonian evolutionary equations admit two constants of motion in the equal-mass limit, ...
Parameterization of Frontal Symmetric Instabilities. I: Theory for Resolved Fronts
(ElsevierOcean Modelling, 2017-01-01)
A parameterization is proposed for the effects of symmetric instability (SI) on a resolved front. The parameterization is dependent on external forcing by surface buoyancy loss and/or down-front winds, which reduce potential ...
Using inpainting to construct accurate cut-sky CMB estimators
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2017-02-23)
The direct evaluation of manifestly optimal, cut-sky cosmic microwave background (CMB) power spectrum and bispectrum estimators is numerically very costly, due to the presence of inverse-covariance filtering operations. ...
The acoustic Green's function for swirling flow in a lined duct
(ElsevierJournal of Sound and Vibration, 2017-05-12)
This paper considers the acoustic field inside an annular duct carrying mean axial and swirling flow and with either acoustically hard or lined walls. The particular aim is to compute the Green's function, which is required ...
The Galilean superstring
(SpringerJournal of High Energy Physics, 2017-02-21)
The action for a Galilean superstring is found from a non-relativistic limit of the closed Green-Schwarz (GS) superstring; it has zero tension and provides an example of a massless super-Galilean system. A Wess-Zumino term ...
Equivariant semidefinite lifts of regular polygons
(Institute for Operations Research and the Management SciencesMathematics of Operations Research, 2017-05-01)
Given a polytope P in $\mathbb{R}^n$, we say that P has a positive
semidefinite lift (psd lift) of size d if one can express P as the linear
projection of an affine slice of the positive semidefinite cone
$\mathbf{S}^d_+$. ...
Lieb's concavity theorem, matrix geometric means, and semidefinite optimization
(Linear Algebra and Its Applications, 2017-01-15)
A famous result of Lieb establishes that the map (A,B)↦tr[K^* A^{1−t}KB^{t}] is jointly concave in the pair (A,B) of positive definite matrices, where K is a fixed matrix and t∈[0,1]. In this paper we show that Lieb's ...