113 research outputs found
Higher-Spin Theory and Space-Time Metamorphoses
Introductory lectures on higher-spin gauge theory given at 7 Aegean workshop
on non-Einstein theories of gravity. The emphasis is on qualitative features of
the higher-spin gauge theory and peculiarities of its space-time
interpretation. In particular, it is explained that Riemannian geometry cannot
play a fundamental role in the higher-spin gauge theory. The higher-spin
symmetries are argued to occur at ultra high energy scales beyond the Planck
scale. This suggests that the higher-spin gauge theory can help to understand
Quantum Gravity. Various types of higher-spin dualities are briefly discussed.Comment: 37 pages, no figures; V2: references adde
Higher-Spin Gauge Fields Interacting with Scalars: The Lagrangian Cubic Vertex
We apply a recently presented BRST procedure to construct the Largangian
cubic vertex of higher-spin gauge field triplets interacting with massive free
scalars. In flat space, the spin-s triplet propagates the series of irreducible
spin-s, s-2,..,0/1 modes which couple independently to corresponding conserved
currents constructed from the scalars. The simple covariantization of the flat
space result is not enough in AdS, as new interaction vertices appear. We
present in detail the cases of spin-2 and spin-3 triplets coupled to scalars.
Restricting to a single irreducible spin-s mode we uncover previously obtained
results. We also present an alternative derivation of the lower spin results
based on the idea that higher-spin gauge fields arise from the gauging of
higher derivative symmetries of free matter Lagrangians. Our results can be
readily applied to holographic studies of higher-spin gauge theories.Comment: 26 pages, v2: references adde
Nonlinear Equations for Symmetric Massless Higher Spin Fields in
Nonlinear field equations for totally symmetric bosonic massless fields of
all spins in any dimension are presented.Comment: 19 pages, latex, no figures, v2 minor correction
The Scientific Foundations of Forecasting Magnetospheric Space Weather
The magnetosphere is the lens through which solar space weather phenomena are focused and directed towards the Earth. In particular, the non-linear interaction of the solar wind with the Earth's magnetic field leads to the formation of highly inhomogenous electrical currents in the ionosphere which can ultimately result in damage to and problems with the operation of power distribution networks. Since electric power is the fundamental cornerstone of modern life, the interruption of power is the primary pathway by which space weather has impact on human activity and technology. Consequently, in the context of space weather, it is the ability to predict geomagnetic activity that is of key importance. This is usually stated in terms of geomagnetic storms, but we argue that in fact it is the substorm phenomenon which contains the crucial physics, and therefore prediction of substorm occurrence, severity and duration, either within the context of a longer-lasting geomagnetic storm, but potentially also as an isolated event, is of critical importance. Here we review the physics of the magnetosphere in the frame of space weather forecasting, focusing on recent results, current understanding, and an assessment of probable future developments.Peer reviewe
Cubic Vertices for Symmetric Higher-Spin Gauge Fields in
Cubic vertices for symmetric higher-spin gauge fields of integer spins in
are analyzed. generalization of the previously known action
in , that describes cubic interactions of symmetric massless fields of
all integer spins , is found. A new cohomological formalism for the
analysis of vertices of higher-spin fields of any symmetry and/or order of
nonlinearity is proposed within the frame-like approach. Using examples of
spins two and three it is demonstrated how nontrivial vertices in ,
including Einstein cubic vertex, can result from the deformation of
trivial Minkowski vertices. A set of higher-derivative cubic vertices for any
three bosonic fields of spins is proposed, which is conjectured to
describe all vertices in that can be constructed in terms of connection
one-forms and curvature two-forms of symmetric higher-spin fields. A problem of
reconstruction of a full nonlinear action starting from known unfolded
equations is discussed. It is shown that the normalization of free higher-spin
gauge fields compatible with the flat limit relates the noncommutativity
parameter of the higher-spin algebra to the radius.Comment: 78 pages. V2: typos corrected, coefficients in sections 5.1 and 6.3
corrected and undetermined coefficients of the supertrace of higher-spin
algebra in section 6.1 and of the relation between tensor and generating
function formalism in section 7.3 are computed. Clarifications, graphs,
references and acknowledgments added. V3: typos corrected, reference added,
the version to appear in Nucl.Phys.
Microflares and the Statistics of X-ray Flares
This review surveys the statistics of solar X-ray flares, emphasising the new
views that RHESSI has given us of the weaker events (the microflares). The new
data reveal that these microflares strongly resemble more energetic events in
most respects; they occur solely within active regions and exhibit
high-temperature/nonthermal emissions in approximately the same proportion as
major events. We discuss the distributions of flare parameters (e.g., peak
flux) and how these parameters correlate, for instance via the Neupert effect.
We also highlight the systematic biases involved in intercomparing data
representing many decades of event magnitude. The intermittency of the
flare/microflare occurrence, both in space and in time, argues that these
discrete events do not explain general coronal heating, either in active
regions or in the quiet Sun.Comment: To be published in Space Science Reviews (2011
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