183 research outputs found
Hyperkahler Metrics from Periodic Monopoles
Relative moduli spaces of periodic monopoles provide novel examples of
Asymptotically Locally Flat hyperkahler manifolds. By considering the
interactions between well-separated periodic monopoles, we infer the asymptotic
behavior of their metrics. When the monopole moduli space is four-dimensional,
this construction yields interesting examples of metrics with self-dual
curvature (gravitational instantons). We discuss their topology and complex
geometry. An alternative construction of these gravitational instantons using
moduli spaces of Hitchin equations is also described.Comment: 23 pages, latex. v2: an erroneous formula is corrected, and its
derivation is given. v3 (published version): references adde
N=2 Supersymmetric Scalar-Tensor Couplings
We determine the general coupling of a system of scalars and antisymmetric
tensors, with at most two derivatives and undeformed gauge transformations, for
both rigid and local N=2 supersymmetry in four-dimensional spacetime. Our
results cover interactions of hyper, tensor and double-tensor multiplets and
apply among others to Calabi-Yau threefold compactifications of Type II
supergravities. As an example, we give the complete Lagrangian and
supersymmetry transformation rules of the double-tensor multiplet dual to the
universal hypermultiplet.Comment: 23 pages, LaTeX2e with amsmath.sty; v2: corrected typos and added
referenc
Hilbert Series for Moduli Spaces of Two Instantons
The Hilbert Series (HS) of the moduli space of two G instantons on C^2, where
G is a simple gauge group, is studied in detail. For a given G, the moduli
space is a singular hyperKahler cone with a symmetry group U(2) \times G, where
U(2) is the natural symmetry group of C^2. Holomorphic functions on the moduli
space transform in irreducible representations of the symmetry group and hence
the Hilbert series admits a character expansion. For cases that G is a
classical group (of type A, B, C, or D), there is an ADHM construction which
allows us to compute the HS explicitly using a contour integral. For cases that
G is of E-type, recent index results allow for an explicit computation of the
HS. The character expansion can be expressed as an infinite sum which lives on
a Cartesian lattice that is generated by a small number of representations.
This structure persists for all G and allows for an explicit expressions of the
HS to all simple groups. For cases that G is of type G_2 or F_4, discrete
symmetries are enough to evaluate the HS exactly, even though neither ADHM
construction nor index is known for these cases.Comment: 53 pages, 9 tables, 24 figure
Empathy, engagement, entrainment: the interaction dynamics of aesthetic experience
A recent version of the view that aesthetic experience is based in empathy as inner
imitation explains aesthetic experience as the automatic simulation of actions,
emotions, and bodily sensations depicted in an artwork by motor neurons in the brain. Criticizing the simulation theory for committing to an erroneous concept of empathy and failing to distinguish regular from aesthetic experiences of art, I advance an alternative, dynamic approach and claim that aesthetic experience is enacted and skillful, based in the recognition of othersâ experiences as distinct from oneâs own. In combining insights from mainly psychology, phenomenology, and cognitive science, the dynamic approach aims to explain the emergence of aesthetic experience in terms of the reciprocal interaction between viewer and artwork. I argue that aesthetic experience emerges by participatory sense-making and revolves around movement as a means for creating meaning. While entrainment merely plays a preparatory part in this, aesthetic engagement constitutes the phenomenological side of coupling to an artwork and provides the context for exploration, and eventually for moving, seeing, and feeling with art. I submit that aesthetic experience emerges from bodily and emotional engagement with works of art via the complementary processes of the perceptionâaction and motionâemotion loops. The former involves the embodied
visual exploration of an artwork in physical space, and progressively structures and organizes visual experience by way of perceptual feedback from body movements made in response to the artwork. The latter concerns the movement qualities and shapes of implicit and explicit bodily responses to an artwork that cue emotion and thereby modulate over-all affect and attitude. The two processes cause the viewer to bodily and emotionally move with and be moved by individual works of art, and consequently to recognize another psychological orientation than her own, which explains how art can cause feelings of insight or awe and disclose aspects of life that are unfamiliar or novel to the viewer
Five-dimensional gauge theory and compactification on a torus
We study five-dimensional minimally supersymmetric gauge theory compactified
on a torus down to three dimensions, and its embedding into string/M-theory
using geometric engineering. The moduli space on the Coulomb branch is
hyperkaehler equipped with a metric with modular transformation properties. We
determine the one-loop corrections to the metric and show that they can be
interpreted as worldsheet and D1-brane instantons in type IIB string theory.
Furthermore, we analyze instanton corrections coming from the solitonic BPS
magnetic string wrapped over the torus. In particular, we show how to compute
the path-integral for the zero-modes from the partition function of the M5
brane, or, using a 2d/4d correspondence, from the partition function of N=4 SYM
theory on a Hirzebruch surface.Comment: 30 pages, 2 figures; v2: typos corrected, added references, JHEP
versio
Emotion and ethics: an inter-(en)active approach
The original publication is available at www.springerlink.comIn this paper we start exploring the affective and ethical dimension of what De Jaegher and Di
Paolo (2007) have called âparticipatory sense-makingâ. In the first part, we distinguish
various ways in which we are, and feel, affectively inter-connected in interpersonal
encounters. In the second part, we discuss the ethical character of this affective interconnectedness,
as well as the implications that taking an âinter-(en)active approachâ has for
ethical theory itself
Is it me or us? The impact of individual and collective participation on work engagement and burnout in a cluster-randomized organisational intervention
Participation is generally recommended when implementing organisational interventions, however, understanding how participation works remains understudied. In a cluster-randomised, controlled intervention employing a wait-list control design, we explore whether perceptions of individual or collective participation had the greatest impact on a participatory organisational interventionâs outcomes; work engagement and burnout. We conducted the study in the Danish postal service (N = 330). Using multi-level analyses, we found that perceptions of individual participation predicted improvements in work engagement and reductions in burnout post-intervention, however, these relationships became non-significant after including perceptions of being part of a collective participatory process in the model. Our findings add to the understanding of the role participation and in particular, perceptions of a collective participatory intervention process, plays in ensuring interventions achieve their intended outcomes
- âŠ