5,992 research outputs found
Comments on the Chern-Simons photon term in the QED description of graphene
We revisit the Coleman-Hill theorem in the context of reduced planar QED.
Using the global U(1) Ward identity for this non-local but still gauge
invariant theory, we can confirm that the topological piece of the photon
self-energy at zero momentum does not receive further quantum corrections apart
from the potential one-loop contribution, even when considering the Lorentz
non-invariant case due to the Fermi velocity . This is of relevance to
probe possible time parity odd dynamics in a planar sheet of graphene which has
an effective description in terms of -dimensional planar reduced QED.Comment: New section added, published versio
Dynamical properties of nuclear and stellar matter and the symmetry energy
The effects of density dependence of the symmetry energy on the collective
modes and dynamical instabilities of cold and warm nuclear and stellar matter
are studied in the framework of relativistic mean-field hadron models. The
existence of the collective isovector and possibly an isoscalar collective mode
above saturation density is discussed. It is shown that soft equations of state
do not allow for a high density isoscalar collective mode, however, if the
symmetry energy is hard enough an isovector mode will not disappear at high
densities. The crust-core transition density and pressure are obtained as a
function of temperature for -equilibrium matter with and without
neutrino trapping. An estimation of the size of the clusters formed in the
non-homogeneous phase as well as the corresponding growth rates and
distillation effect is made. It is shown that cluster sizes increase with
temperature, that the distillation effect close to the inner edge of the
crust-core transition is very sensitive to the symmetry energy, and that,
within a dynamical instability calculation, the pasta phase exists in warm
compact stars up to 10 - 12 MeV.Comment: 16 pages, 10 figures. Submitted for publication in Phys. Rev.
The 1953 Cosmic Ray Conference at Bagneres de Bigorre
The cosmic ray conference at Bagn`eres de Bigorre in July, 1953 organized by
Patrick Blackett and Louis Leprince-Ringuet was a seminal one. It marked the
beginning of sub atomic physics and its shift from cosmic ray research to
research at the new high energy accelerators. The knowledge of the heavy
unstable particles found in the cosmic rays was essentially correct in fact and
interpretation and defined the experiments that needed to be carried out with
the new accelerators. A large fraction of the physicists who had been using
cosmic rays for their research moved to the accelerators. This conference can
be placed in importance in the same category as two other famous conferences,
the Solvay congress of 1927 and the Shelter Island Conference of 1948
Correction of artificial jumps in the historical geomagnetic measurements of Coimbra Observatory, Portugal
The Coimbra Magnetic Observatory (International Association of Geomagnetism and Aeronomy code COI) in Portugal has a long
history of observation of the geomagnetic field, spanning almost 150 yr
since the first geomagnetic measurements in 1866. These long instrumental
geomagnetic records provide very important information about variability of
geomagnetic elements and indices, their trends and cycles, and can be used
to improve our knowledge on the sources that drive variations of the
geomagnetic field: liquid core dynamics (internal) and solar forcing
(external).
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However, during the long life of the Coimbra Observatory, some inevitable
changes in station location, instrument's park and electromagnetic
environment have taken place. These changes affected the quality of the data
collected at COI causing breaks and jumps in the series of geomagnetic field
components and local K index. Clearly, these inhomogeneities, typically
shift-like (step-like) or trend-like, have to be corrected or, at least,
minimized in order for the data to be used in scientific studies or to be
submitted to international databases.
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In this study, the series of local K index and declination of the
geomagnetic field are analysed: the former because it allows direct
application of standard homogenization methods and the latter because it is
the longest continuous series produced at COI. For the homogenization,
visual and statistical tests (e.g. standard normal homogeneity test) have
been applied directly to the local geomagnetic K index series (from 1951 to
2012). The homogenization of the monthly averages of declination (from 1867
to 2012) has been done using visual analysis and statistical tests applied
to the time series of the first differences of declination values, as an
approximation to the first time derivative. This allowed not only
estimating the level of inhomogeneity of the studied series but also
detecting the highly probable homogeneity break points. These points have been
cross-checked with the metadata, and the COI series have been compared with
reference series from the nearest geomagnetic stations and, in the case of
declination series, from the recent geomagnetic field model COV-OBS to set
up the required correction factors. As a result, the homogenized series
measured in COI are considered to be essentially free of artificial shifts
starting from the second half of the 20th century, and ready to be used by
the scientific community
Elementos paratextuales en Prosas propicias de Luis Felipe Vivanco
Con frecuencia el paratexto de una obra literaria –portada, prefacio, tÃtulo, subtÃtulo, dedicatorias, epÃgrafes…- aporta al lector importantes orientaciones para su correcta lectura e interpretación. El objeto de este artÃculo es, precisamente, analizar la función de los abundantes y variados elementos paratextuales de Prosas propicias (1976), la última obra escrita por el poeta Luis Felipe Vivanco. The paratext of a literary work –front cover, preface, title, subtitle, dedications, epigraphs- frequently provides readers with important hints to favour accurate reading and understanding. This article is precisely intented to analyse the functions of many and various paratextual features in Prosas propicias (1976), the last griten work by Luis Felipe Vivanco
Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field
International audienceWe present core flows constructed from high resolution secular variation (SV) models for the epochs 2001, 2002.5 and 2004, assuming that these flows are quasi-geostrophic in the core interior and that they do not cross the axial cylindrical surface tangent to the inner core. A large jet encircling the inner core and carrying a significant part of the core angular momentum and axial vortices of ∼700 km diameter mainly clustering around the cylinder tangent to the solid inner core, are inferred from geomagnetic SV. New regularizations are suggested from dynamic considerations. It is found that medium and small-scale velocity fields contribute significantly to the large-scale SV. Accordingly, final models of core flows are calculated after an iterative process, whereby the magnetic field variation produced by small-scale stochastic magnetic fields and medium to small-scale computed velocity fields are incorporated into the inversion itself as modelling errors. This study represents a significant step in an effort to join geomagnetic observations and the fluid core dynamics on short timescales
On the embedding of spacetime in five-dimensional Weyl spaces
We revisit Weyl geometry in the context of recent higher-dimensional theories
of spacetime. After introducing the Weyl theory in a modern geometrical
language we present some results that represent extensions of Riemannian
theorems. We consider the theory of local embeddings and submanifolds in the
context of Weyl geometries and show how a Riemannian spacetime may be locally
and isometrically embedded in a Weyl bulk. We discuss the problem of classical
confinement and the stability of motion of particles and photons in the
neighbourhood of branes for the case when the Weyl bulk has the geometry of a
warped product space. We show how the confinement and stability properties of
geodesics near the brane may be affected by the Weyl field. We construct a
classical analogue of quantum confinement inspired in theoretical-field models
by considering a Weyl scalar field which depends only on the extra coordinate.Comment: 16 pages, new title and references adde
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