3,673 research outputs found
Estimating total momentum at finite distances
We study the difficulties associated with the evaluation of the total Bondi
momentum at finite distances around the central source of a general
(asymptotically flat) spacetime. Since the total momentum is only rigorously
defined at future null infinity, both finite distance and gauge effects must be
taken into account for a correct computation of this quantity.
Our discussion is applicable in general contexts but is particularly relevant
in numerically constructed spacetimes for both extracting important physical
information and assessing the accuracy of additional quantities.Comment: 10 pages, 1 figure. Typos corrected. Comments added and a new
Appendix. To be published in PR
Partially quenched chiral perturbation theory in the epsilon regime at next-to-leading order
We calculate the partition function of partially quenched chiral perturbation
theory in the epsilon regime at next-to-leading order using the supersymmetry
method in the formulation without a singlet particle. We include a nonzero
imaginary chemical potential and show that the finite-volume corrections to the
low-energy constants and for the partially quenched partition
function, and hence for spectral correlation functions of the Dirac operator,
are the same as for the unquenched partition function. We briefly comment on
how to minimize these corrections in lattice simulations of QCD. As a side
result, we show that the zero-momentum integral in the formulation without a
singlet particle agrees with previous results from random matrix theory.Comment: 19 pages, 4 figures; minor changes, to appear in JHE
Two-divisibility of the coefficients of certain weakly holomorphic modular forms
We study a canonical basis for spaces of weakly holomorphic modular forms of
weights 12, 16, 18, 20, 22, and 26 on the full modular group. We prove a
relation between the Fourier coefficients of modular forms in this canonical
basis and a generalized Ramanujan tau-function, and use this to prove that
these Fourier coefficients are often highly divisible by 2.Comment: Corrected typos. To appear in the Ramanujan Journa
Unpolarized light in quantum optics
We present a new derivation of the unpolarized quantum states of light, whose
general form was first derived by Prakash and Chandra [Phys. Rev. A 4, 796
(1971)]. Our derivation makes use of some basic group theory, is
straightforward, and offers some new insights.Comment: 3 pages, REVTeX, presented at ICQO'200
AMR, stability and higher accuracy
Efforts to achieve better accuracy in numerical relativity have so far
focused either on implementing second order accurate adaptive mesh refinement
or on defining higher order accurate differences and update schemes. Here, we
argue for the combination, that is a higher order accurate adaptive scheme.
This combines the power that adaptive gridding techniques provide to resolve
fine scales (in addition to a more efficient use of resources) together with
the higher accuracy furnished by higher order schemes when the solution is
adequately resolved. To define a convenient higher order adaptive mesh
refinement scheme, we discuss a few different modifications of the standard,
second order accurate approach of Berger and Oliger. Applying each of these
methods to a simple model problem, we find these options have unstable modes.
However, a novel approach to dealing with the grid boundaries introduced by the
adaptivity appears stable and quite promising for the use of high order
operators within an adaptive framework
SUSTENTABILIDAD DE AGROECOSISTEMAS EN TRES COMUNIDADES MBYA GUARANI DEL DEPARTAMENTO DE CAAGUAZÚ: UNA PROPUESTA METODOLÓGICA
Los Mbya Guarani son un pueblo que se dedican a la caza, la pesca, la recolección y la agricultura. Su agroecosistema se caracteriza por no poseer límites definidos, cuyo fin es la producción de alimentos con mano de obra familiar. Esta investigación tiene por objetivo desarrollar una propuesta metodológica de evaluación de la sustentabilidad de agroecosistemas adaptada a las Comunidades Mbya Guarani de Tekoha Porã, Tekoha Miri e Ykuá Porã, departamento de Caaguazú. La población de estudio fue de tres familias extensas. La propuesta incorpora indicadores de sustentabilidad que fueron agrupados en tres niveles jerárquicos. El promedio general de sustentabilidad de las familias extensas evaluadas fue de tres, en una escala del 0 al 4, indicando que se encuentran encaminadas hacia la sustentabilidad, pero necesitan el fortalecimiento de algunas prácticas. El método diseñado ha probado ser de fácil aplicación, sencillo, rápido y adaptado a la realidad de las familias evaluadas
A Robot Model of OC-Spectrum Disorders : Design Framework, Implementation and First Experiments
© 2019 Massachusetts Institute of TechnologyComputational psychiatry is increasingly establishing itself as valuable discipline for understanding human mental disorders. However, robot models and their potential for investigating embodied and contextual aspects of mental health have been, to date, largely unexplored. In this paper, we present an initial robot model of obsessive-compulsive (OC) spectrum disorders based on an embodied motivation-based control architecture for decision making in autonomous robots. The OC family of conditions is chiefly characterized by obsessions (recurrent, invasive thoughts) and/or compulsions (an urge to carry out certain repetitive or ritualized behaviors). The design of our robot model follows and illustrates a general design framework that we have proposed to ground research in robot models of mental disorders, and to link it with existing methodologies in psychiatry, and notably in the design of animal models. To test and validate our model, we present and discuss initial experiments, results and quantitative and qualitative analysis regarding the compulsive and obsessive elements of OC-spectrum disorders. While this initial stage of development only models basic elements of such disorders, our results already shed light on aspects of the underlying theoretical model that are not obvious simply from consideration of the model.Peer reviewe
On Turing dynamical systems and the Atiyah problem
Main theorems of the article concern the problem of M. Atiyah on possible
values of l^2-Betti numbers. It is shown that all non-negative real numbers are
l^2-Betti numbers, and that "many" (for example all non-negative algebraic)
real numbers are l^2-Betti numbers of simply connected manifolds with respect
to a free cocompact action. Also an explicit example is constructed which leads
to a simply connected manifold with a transcendental l^2-Betti number with
respect to an action of the threefold direct product of the lamplighter group
Z/2 wr Z. The main new idea is embedding Turing machines into integral group
rings. The main tool developed generalizes known techniques of spectral
computations for certain random walk operators to arbitrary operators in
groupoid rings of discrete measured groupoids.Comment: 35 pages; essentially identical to the published versio
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