66 research outputs found
Planets in turbulent Disks
Planets form in protoplanetary accretion disks
around young protostars. These disks are driven by internal
turbulence and the gas flow is in general not laminar but has
stochastic components. For weakly ionized disks the turbulence
can be generated purely hydrodynamically through the vertical
shear instability (VSI). Planets, that are forming in such turbulent
disks, experience random components in the torques acting on
them, that will modify their migration behaviour.
In this contribution we present results of our study of the
impact that a turbulent disk has on an embedded planet. For
that purpose we performed three-dimensional hydrodynamical
simulations of a locally isothermal disk with embedded planets
of various masses. For the lower mass planets (5 and 10 M )
we find that the inward migration rate can be faster than in the
laminar case, while for the more massive planets (30 and 100
M ) the results agree well with the laminar results
A model for a large investor trading at market indifference prices. I: single-period case
We develop a single-period model for a large economic agent who trades with
market makers at their utility indifference prices. A key role is played by a
pair of conjugate saddle functions associated with the description of Pareto
optimal allocations in terms of the utility function of a representative market
maker.Comment: Shorten from 69 to 30 pages due to referees' requests; a part of the
previous version has been moved to "The stochastic field of aggregate
utilities and its saddle conjugate", arXiv:1310.728
Proceedings of the 4th bwHPC Symposium
The bwHPC Symposium 2017 took place on October 4th, 2017, Alte Aula, TĂŒbingen. It focused on the presentation of scientific computing projects as well as on the progress and the success stories of the bwHPC realization concept. The event offered a unique opportunity to engage in an active dialogue between scientific users, operators of bwHPC sites, and the bwHPC support team
Genetic architecture of spatial electrical biomarkers for cardiac arrhythmia and relationship with cardiovascular disease
The 3-dimensional spatial and 2-dimensional frontal QRS-T angles are measures derived from the vectorcardiogram. They are independent risk predictors for arrhythmia, but the underlying biology is unknown. Using multi-ancestry genome-wide association studies we identify 61 (58 previously unreported) loci for the spatial QRS-T angle (N = 118,780) and 11 for the frontal QRS-T angle (N = 159,715). Seven out of the 61 spatial QRS-T angle loci have not been reported for other electrocardiographic measures. Enrichments are observed in pathways related to cardiac and vascular development, muscle contraction, and hypertrophy. Pairwise genome-wide association studies with classical ECG traits identify shared genetic influences with PR interval and QRS duration. Phenome-wide scanning indicate associations with atrial fibrillation, atrioventricular block and arterial embolism and genetically determined QRS-T angle measures are associated with fascicular and bundle branch block (and also atrioventricular block for the frontal QRS-T angle). We identify potential biology involved in the QRS-T angle and their genetic relationships with cardiovascular traits and diseases, may inform future research and risk prediction
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