5,541 research outputs found
g-2 In the custodially protected RS model
We study leptonic operators of dimension six in the custodially protected
Randall-Sundrum model. Their contribution to the anomalous magnetic moment of
the muon is evaluated. We find that the contribution to g-2 due to diagrams
with an internal gauge boson exchange is given by approximately 2.72*10^-10 (1
TeV/T)^2 basically independent of the model parameters except for the KK mass
scale T---a factor of more than 3 larger than in a scenario without custodial
protection. We also investigate the impact of contributions to the dipole
operators due to an internal Higgs exchange, which can provide sizable albeit
model-dependent corrections.Comment: 21 pages, 8 figure
Potentials and Limits to Basin Stability Estimation
Acknowledgments The authors gratefully acknowledge the support of BMBF, CoNDyNet, FK. 03SF0472A.Peer reviewedPublisher PD
Survivability of Deterministic Dynamical Systems
The notion of a part of phase space containing desired (or allowed) states of
a dynamical system is important in a wide range of complex systems research. It
has been called the safe operating space, the viability kernel or the sunny
region. In this paper we define the notion of survivability: Given a random
initial condition, what is the likelihood that the transient behaviour of a
deterministic system does not leave a region of desirable states. We
demonstrate the utility of this novel stability measure by considering models
from climate science, neuronal networks and power grids. We also show that a
semi-analytic lower bound for the survivability of linear systems allows a
numerically very efficient survivability analysis in realistic models of power
grids. Our numerical and semi-analytic work underlines that the type of
stability measured by survivability is not captured by common asymptotic
stability measures.Comment: 21 pages, 6 figure
Survivability : A Unifiying Concept for the Transient Resilience of Deterministic Dynamical Systems
16 pagesNon peer reviewedPreprin
The impact of model detail on power grid resilience measures
Peer reviewedPreprin
Erratum to: “Toc, Tic, and chloroplast protein import” [Biochim. Biophys. Acta 1541 (2001) 64–79]
AbstractThe vast majority of chloroplast proteins are synthesized in precursor form on cytosolic ribosomes. Chloroplast precursor proteins have cleavable, N-terminal targeting signals called transit peptides. Transit peptides direct precursor proteins to the chloroplast in an organelle-specific way. They can be phosphorylated by a cytosolic protein kinase, and this leads to the formation of a cytosolic guidance complex. The guidance complex—comprising precursor, hsp70 and 14–3–3 proteins, as well as several unidentified components—docks at the outer envelope membrane. Translocation of precursor proteins across the envelope is achieved by the joint action of molecular machines called Toc (translocon at the outer envelope membrane of chloroplasts) and Tic (translocon at the inner envelope membrane of chloroplasts), respectively. The action of the Toc/Tic apparatus requires the hydrolysis of ATP and GTP at different levels, indicating energetic requirements and regulatory properties of the import process. The main subunits of the Toc and Tic complexes have been identified and characterized in vivo, in organello and in vitro. Phylogenetic evidence suggests that several translocon subunits are of cyanobacterial origin, indicating that today's import machinery was built around a prokaryotic core
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