415 research outputs found
Invariants and divergences in half-maximal supergravity theories
The invariants in half-maximal supergravity theories in D=4,5 are discussed
in detail up to dimension eight (e.g. R^4). In D=4, owing to the anomaly in the
rigid SL(2,R) duality symmetry, the restrictions on divergences need careful
treatment. In pure N=4 supergravity, this anomalous symmetry still implies
duality invariance of candidate counterterms at three loops. Provided one makes
the additional assumption that there exists a full 16-supercharge off-shell
formulation of the theory, counterterms at L>1 loops would also have to be
writable as full-superspace integrals. At the three-loop order such a
duality-invariant full-superspace integral candidate counterterm exists, but
its duality invariance is marginal in the sense that the full-superspace
counter-Lagrangian is not itself duality-invariant. We show that such marginal
invariants are not allowable as counterterms in a 16-supercharge off-shell
formalism. It is not possible to draw the same conclusion when vector
multiplets are present because of the appearance of F^4 terms in the SL(2,R)
anomaly. In D=5 there is no one-loop anomaly in the shift invariance of the
dilaton, and we argue that this implies finiteness at two loops, again subject
to the assumption that 16 supercharges can be preserved off-shell.Comment: 81 page
Anomalies and divergences in N=4 supergravity
The invariants in D=4, N=4 supergravity are discussed up to the three-loop
order (where one expects a general R^4 structure). Because there is an anomaly
in the rigid SL(2,R) symmetry of this theory, the analysis of possible
restrictions on three-loop divergences due to duality needs careful treatment.
We show that this anomalous symmetry is still strong enough at the three-loop
order to require duality invariance of candidate counterterms. Provided one
makes the additional assumption that there exists a full 16-supercharge
off-shell formulation of the theory, counterterms at L \ge 2 loops would also
have to be writable as full-superspace integrals. At the three-loop order such
a duality-invariant full-superspace integral candidate counterterm exists, but
its duality invariance is marginal in the sense that the full-superspace
counter-Lagrangian is not itself duality invariant. We show that, subject to
the assumption that a full off-shell quantisation formalism exists, such
marginal invariants are not allowable as counterterms.Comment: 15 pages, version published in Phys. Lett.
Supersymmetric Electrovacs In Gauged Supergravities
We show that the D=6 SU(2) gauged supergravity of van Nieuwenhuizen et al,
obtained by dimensional reduction of the D=7 topologically massive gauged
supergravity and previously thought not to be dimensionally reducible, can be
further reduced to five and four dimensions. On reduction to D=4 one recovers
the special case of the SU(2)XSU(2) gauged supergravity of Freedman and Schwarz
for which one of the SU(2) coupling constants vanishes. Previously known
supersymmetric electrovacs of this model then imply new ground states in 7-D.
We construct a supersymmetric electrovac solution of N=2 SU(2) gauged
supergravity in 7-D. We also investigate the domain wall solutions of these
theories and show they preserve a half of the supersymmetry.Comment: 29 pages, TeX, no figures. Introduction and conclusion rewritten. New
references added. Minor changes to all section
Euler Chern Simons Gravity from Lovelock Born Infeld Gravity
In the context of a gauge theoretical formulation, higher dimensional gravity
invariant under the AdS group is dimensionally reduced to Euler-Chern-Simons
gravity. The dimensional reduction procedure of Grignani-Nardelli [Phys. Lett.
B 300, 38 (1993)] is generalized so as to permit reducing D-dimensional Lanczos
Lovelock gravity to d=D-1 dimensions.Comment: 6 pages, no figures, accepted for publication in Phys. Lett.
Multiple M-wave interaction with fluxes
We present the equations of motion for multiple M0-brane (multiple M-wave or
mM0) system in general eleven dimensional supergravity background. These are
obtained in the frame of superembedding approach, but have a rigid structure:
they can be restored from SO(1,1) x SO(9) symmetry characteristic for M0. BPS
conditions for the 1/2 supersymmetric solution of these equations have the
fuzzy 2-sphere solution describing M2-brane.Comment: 4 pages, no figures, RevTeX4. V2. The discussion on BPS conditions
and some supersymmetric solutions is added. The explicit values of the
coefficients for the interacting terms are presented. Also a couple of minor
changes. V3: a small misrint corrected. Published: Phys.Rev.Lett.105 (2010)
07160
On duality symmetries of supergravity invariants
The role of duality symmetries in the construction of counterterms for maximal supergravity theories is discussed in a field-theoretic context from different points of view. These are: dimensional reduction, the question of whether appropriate superspace measures exist and information about non-linear invariants that can be gleaned from linearised ones. In D=4, N=8 supergravity we find that all three of these arguments suggest that F-term counterterms cannot be E7(7)-invariant and that the theory should be finite up to seven loops as a consequence. We also argue that N=6 supergravity is finite at three and four loops and that N=5 supergravity should be three-loop finite
A non local unitary vector model in 3-D
We present a unified analysis of single excitation vector models in 3D. We
show that there is a family of first order master actions related by duality
transformations which interpolate between the different models. We use a
Hamiltonian (2+1) analysis to show the equivalence of the self-dual and
topologically massive models with a covariant non local model which propagates
also a single massive excitation. It is shown how the non local terms appears
naturally in the path integral framework.Comment: 13 pages, 1 figur
The Low-level Spectrum of the String
We investigate the spectrum of physical states in the string theory, up
to level 2 for a multi-scalar string, and up to level 4 for the two-scalar
string. The (open) string has a photon as its only massless state. By
using screening charges to study the null physical states in the two-scalar
string, we are able to learn about the gauge symmetries of the states in
the multi-scalar string.Comment: 31 pages, Plain Tex, CTP TAMU-70/92, Goteborg ITP 92-43,
Imperial/TP/91-92/22, KCL-TH-92-
Sleep hygiene and psycho-emotional load for office employees
Received: February 10th, 2023 ; Accepted: June 16th, 2023 ; Published: July 6th, 2023 ; Correspondence: [email protected] development of technology and changes in the world have dramatically increased
the psycho-emotional risk exposure for office employees. At the work with computer and digital
devices in the offices, employees are exposed to several risk factors of the work environment and
one of the most frequent complaints is psycho-emotional load caused by various issues. There is
no denying that sleep is one of the basic human needs, and sleep quality is important for
maintaining and preserving good health and wellbeing. Sleep hygiene includes a set of various
measures, such as the regularity of waking up and going to bed, that can affect and improve the
quality of sleep. Sleep quality is closely related to mental health, as poor mental health can
negatively affect sleep quality and vice versa. Reduced psycho-emotional load is associated with
better sleep hygiene and also good sleep hygiene is associated with reduced psycho-emotional
load. Health promotion measures and a work environment that supports sleep health could reduce
psycho-emotional load experienced by employees, increase work ability, productivity and reduce
the risk of accidents at the workplace. The aim of this study was to investigate psycho-emotional
load and sleep hygiene importance for office employees
Critical and Non-Critical Einstein-Weyl Supergravity
We construct N=1 supersymmetrisations of some recently-proposed theories of
critical gravity, conformal gravity, and extensions of critical gravity in four
dimensions. The total action consists of the sum of three separately off-shell
supersymmetric actions containing Einstein gravity, a cosmological term and the
square of the Weyl tensor. For generic choices of the coefficients for these
terms, the excitations of the resulting theory around an AdS_4 background
describe massive spin-2 and massless spin-2 modes coming from the metric;
massive spin-1 modes coming from a vector field in the theory; and massless and
massive spin-3/2 modes (with two unequal masses) coming from the gravitino.
These assemble into a massless and a massive N=1 spin-2 multiplet. In critical
supergravity, the coefficients are tuned so that the spin-2 mode in the massive
multiplet becomes massless. In the supersymmetrised extensions of critical
gravity, the coefficients are chosen so that the massive modes lie in a
"window" of lowest energies E_0 such that these ghostlike fields can be
truncated by imposing appropriate boundary conditions at infinity, thus leaving
just positive-norm massless supergravity modes.Comment: 29 page
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