1,459 research outputs found
Compactness in Banach space theory - selected problems
We list a number of problems in several topics related to compactness in
nonseparable Banach spaces. Namely, about the Hilbertian ball in its weak
topology, spaces of continuous functions on Eberlein compacta, WCG Banach
spaces, Valdivia compacta and Radon-Nikod\'{y}m compacta
Performance Portability Strategies for Grid C++ Expression Templates
One of the key requirements for the Lattice QCD Application Development as
part of the US Exascale Computing Project is performance portability across
multiple architectures. Using the Grid C++ expression template as a starting
point, we report on the progress made with regards to the Grid GPU offloading
strategies. We present both the successes and issues encountered in using CUDA,
OpenACC and Just-In-Time compilation. Experimentation and performance on GPUs
with a SU(3)SU(3) streaming test will be reported. We will also report
on the challenges of using current OpenMP 4.x for GPU offloading in the same
code.Comment: 8 pages, 4 figures. Talk presented at the 35th International
Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spai
The Hubble Diagram of the Calan/Tololo Type Ia Supernovae and the value of Ho
The Calan/Tololo supernova survey has discovered ~30 Type Ia supernovae out
to z~0.1. Using BVI data for these objects and nearby SNe Ia, we have shown
that there exists a significant dispersion in the intrinsic luminosities of
these objects. We have devised a robust chisquare minimization technique
simultaneously fitting the BVI light curves to parametrize the SN event as a
function of (tb,m, m15(B)) where tb is the time of B maximum, m is the peak BVI
magnitude corrected for luminosity variations, and m15(B) is a single parameter
describing the whole light curve morphology. When properly corrected for
m15(B), SNe Ia prove to be high precision distance indicators,yielding relative
distances with errors 7-10%. The corrected peak magnitudes are used to
construct BVI Hubble diagrams (HD), and with Cepheid distances recently
measured with the HST to four nearby SNe Ia (37C, 72E, 81B, 90N) we derive a
value of the Hubble constant of 63.1+/-3.4 (internal) km/s/Mpc. This value is
~10-15% larger than the value obtained by assuming that SNe Ia are perfect
standard candles. As we have shown in Paper V, there is now strong evidence
that galaxies with younger stellar population appear to host the
slowest-declining, and therefore most luminous SNe Ia. Hence, the use of Pop I
objects such as Cepheids to calibrate the zero point of the SNe Ia HD can
easily bias the results toward luminous SNe Ia, unless the absolute
magnitude-decline relation is taken into account.Comment: 32 pages, figures attached, all tables available, to appear in the
Astronomical Journa
GlobalizĂaciĂłn, Class Actions y Derecho de Trabajo
[Excerpt] El objeto principal de este artĂculo consiste en analizar la larga experiencia acumulada al otro lado del Atlántico, en Estados Unidos, en material de demandas extraterritoriales contra empresas norteamericanas ya desde los años setenta. Realizaremos una sĂntesis de los rasgos caracterĂsticos de las class actions en ese paĂs, en primer lugar, seguida por una breve Mirada al context internacional del Derecho del trabajo y la jurisprudencia en EE.UU., de los efectos extraterritoriales del Derecho del trabajo estadounidense, en segundo tĂ©rmino, y un análisis pormenorizado de tales litigious en Europa
The Absolute Luminosities of the Calan/Tololo Type Ia Supernovae
We examine the absolute luminosities of 29 SNe Ia in the Calan/Tololo survey.
We confirm a relation between the peak luminosity of the SNe and the decline
rate as measured by the light curve, as suggested by Phillips (1993). We derive
linear slopes to this magnitude-decline rate relation in BV(I)kc colors, using
a sample with Bmax-Vmax < 0.2 mag. The scatter around this linear relation (and
thus the ability to measure SNe Ia distances) ranges from 0.13 mag (in the I
band) to 0.17 mag (in the B band). We also find evidence for significant
correlations between the absolute magnitudes or the decline rate of the light
curve, and the morphological type of the host galaxy.Comment: 21 pages, 4 figures, to appear in the Astronomical Journa
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