2,188 research outputs found
Pump up the volume: from covert to overt politics in global governance
Recent commentary on the state of multilateralism begins from an alarming premise: a popular backlash against globalization is underway. The prospects for multilateralism depend, by this account, on shielding global governance from the forces of mass politics. We challenge this conventional account to develop a novel conceptual framework for the mass politics of global governance and the role of contestation in resolving, rather than inciting, the present crisis of multilateralism. We distinguish between two modes of mass politics—covert and overt—and examine variation in (i) mass preferences, (ii) party strategies, and (iii) international organization between them. Building on this framework, we make the case for a shift from the current covert mode to a more overt politics of global governance that could make the multilateral system more effective, accountable, and legitimate. Concrete steps in this direction will accommodate broader political forces while defanging challenges from opportunistic political leaders. We conclude with an outline of pragmatic reforms to reinvigorate multilateralism for the post-pandemic era
Intervención de David R. K. Adler, Coordinador General de la Internacional Progresista, en la inauguración del Congreso sobre el Nuevo Orden Económico Internacional, 27 de enero 2023, La Habana, Cuba
Intervención de David R. K. Adler, Coordinador General de la Internacional Progresista, en la inauguración del Congreso sobre el Nuevo Orden Económico Internacional, 27 de enero 2023, La Habana, Cuba
Nuclear Effects on Heavy Boson Production at RHIC and LHC
We predict W and Z transverse momentum distributions from proton-proton and
nuclear collisions at RHIC and LHC. A resummation formalism with power
corrections to the renormalization group equations is used. The dependence of
the resummed QCD results on the non-perturbative input is very weak for the
systems considered. Shadowing effects are discussed and found to be unimportant
at RHIC, but important for LHC. We study the enhancement of power corrections
due to multiple scattering in nuclear collisions and numerically illustrate the
weak effects of the dependence on the nuclear mass.Comment: 21 pages, 11 figure
The Phase Transition to a Square Vortex Lattice in Type-II Superconductors with Fourfold Anisotropy
We investigate the stability of the square vortex lattice which has been
recently observed in experiments on the borocarbide family of superconductors.
Taking into account the tetragonal symmetry of these systems, we add fourfold
symmetric fourth-derivative terms to the Ginzburg-Landau(GL) free energy. At
these terms may be treated perturbatively to lowest order to locate
the transition from a distorted hexagonal to a square vortex lattice. We also
solve for this phase boundary numerically in the strongly type-II limit,
finding large corrections to the lowest-order perturbative results. We
calculate the relative fourfold anisotropy for field in the plane
to be 4.5% at the temperature, , where the transition occurs at
for field along the axis. This is to be compared to the 3.6%
obtained in the perturbative calculation. Furthermore, we find that the phase
boundary in the phase diagram has positive slope near .Comment: 15 pages including 2 figures, LaTe
The Plant Diversity Sampling Design for The National Ecological Observatory Network
The National Ecological Observatory Network (NEON) is designed to facilitate an understanding of the impact of environmental change on ecological systems. Observations of plant diversity—responsive to changes in climate, disturbance, and land use, and ecologically linked to soil, biogeochemistry, and organisms—result in NEON data products that cross a range of organizational levels. Collections include samples of plant tissue to enable investigations of genetics, plot-based observations of incidence and cover of native and non-native species, observations of plant functional traits, archived vouchers of plants, and remote sensing airborne observations. Spatially integrating many ecological observations allows a description of the relationship of plant diversity to climate, land use, organisms, and substrates. Repeating the observations over decades and across the United States will iteratively improve our understanding of those relationships and allow for the testing of system-level hypotheses as well as the development of predictions of future conditions
Reaction Operator Approach to Multiple Elastic Scatterings
We apply the GLV Reaction Operator formalism to compute the effects of
multiple elastic scatterings of jets propagating through dense matter. We
derive the elastic Reaction Operator and demonstrate that the recursion
relations have a closed form solution that reduces to the familiar Glauber
form. We also investigate the accuracy of the Gaussian dipole approximation for
jet transverse momentum broadening.Comment: 9 pages, 4 .ps figures. Uses REVTeX and bbox.st
On CPT Symmetry: Cosmological, Quantum-Gravitational and other possible violations and their phenomenology
I discuss various ways in which CPT symmetry may be violated, and their
phenomenology in current or immediate future experimental facilities, both
terrestrial and astrophysical. Specifically, I discuss first violations of CPT
symmetry due to the impossibility of defining a scattering matrix as a
consequence of the existence of microscopic or macroscopic space-time
boundaries, such as Planck-scale Black-Hole (event) horizons, or cosmological
horizons due to the presence of a (positive) cosmological constant in the
Universe. Second, I discuss CPT violation due to breaking of Lorentz symmetry,
which may characterize certain approaches to quantum gravity, and third, I
describe models of CPT non invariance due to violations of locality of
interactions. In each of the above categories I discuss experimental
sensitivities. I argue that the majority of Lorentz-violating cases of CPT
breaking, with minimal (linear) suppression by the Planck-mass scale, are
already excluded by current experimental tests. There are however some
(stringy) models which can evade these constraints.Comment: 27 pages latex, Conference talk Beyond the Desert 200
Piecewise Linear Models for the Quasiperiodic Transition to Chaos
We formulate and study analytically and computationally two families of
piecewise linear degree one circle maps. These families offer the rare
advantage of being non-trivial but essentially solvable models for the
phenomenon of mode-locking and the quasi-periodic transition to chaos. For
instance, for these families, we obtain complete solutions to several questions
still largely unanswered for families of smooth circle maps. Our main results
describe (1) the sets of maps in these families having some prescribed rotation
interval; (2) the boundaries between zero and positive topological entropy and
between zero length and non-zero length rotation interval; and (3) the
structure and bifurcations of the attractors in one of these families. We
discuss the interpretation of these maps as low-order spline approximations to
the classic ``sine-circle'' map and examine more generally the implications of
our results for the case of smooth circle maps. We also mention a possible
connection to recent experiments on models of a driven Josephson junction.Comment: 75 pages, plain TeX, 47 figures (available on request
RHIC physics overview
The results from data taken during the last several years at the Relativistic
Heavy-Ion Collider (RHIC) will be reviewed in the paper. Several selected
topics that further our understanding of constituent quark scaling, jet
quenching and color screening effect of heavy quarkonia in the hot dense medium
will be presented. Detector upgrades will further probe the properties of Quark
Gluon Plasma. Future measurements with upgraded detectors will be presented.
The discovery perspectives from future measurements will also be discussed.Comment: 9 pages, 4 figures, invited review article, published by Frontier of
Physics in Chin
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