WFIRST Ultra-Precise Astrometry II: Asteroseismology

WFIRST microlensing observations will return high-precision parallaxes, sigma(pi) < 0.3 microarcsec, for the roughly 1 million stars with H<14 in its 2.8 deg^2 field toward the Galactic bulge. Combined with its 40,000 epochs of high precision photometry (~0.7 mmag at H_vega=14 and ~0.1 mmag at H=8), this will yield a wealth of asteroseismic data of giant stars, primarily in the Galactic bulge but including a substantial fraction of disk stars at all Galactocentric radii interior to the Sun. For brighter stars, the astrometric data will yield an external check on the radii derived from the two asteroseismic parameters, and nu_max, while for the fainter ones, it will enable a mass measurement from the single measurable asteroseismic parameter nu_max. Simulations based on Kepler data indicate that WFIRST will be capable of detecting oscillations in stars from slightly less luminous than the red clump to the tip of the red giant branch, yielding roughly 1 million detections.Comment: 13 pages, 6 figures, submitted to JKA

Corner overgrowth: Bending a high mobility two-dimensional electron system by 90 degrees

Introducing an epitaxial growth technique called corner overgrowth, we fabricate a quantum confinement structure consisting of a high-mobility GaAs/AlGaAs heterojunction overgrown on top of an ex-situ cleaved substrate corner. The resulting corner-junction quantum-well heterostructure effectively bends a two-dimensional electron system (2DES) at an atomically sharp $90^{\rm o}$ angle. The high-mobility 2DES demonstrates fractional quantum Hall effect on both facets. Lossless edge-channel conduction over the corner confirms a continuum of 2D electrons across the junction, consistent with Schroedinger-Poisson calculations of the electron distribution. This growth technique differs distinctly from cleaved-edge overgrowth and enables a complementary class of new embedded quantum heterostructures.Comment: 3 pages, 4 figures, latest version accepted to AP

Ichthyosen: Pathophysiologische Modelle der epidermalen Differenzierung

Zusammenfassung: Die Ichthyosen sind eine durch Schuppung oder Keratosen charakterisierte heterogene Krankheitsgruppe monogenetisch vererbter Verhornungsstörungen. In der Vergangenheit wurden sie aufgrund klinischer Zeichen und des Vererbungsmusters nosologisch eingeteilt. Als Folge des massiven Wissenssprunges im Gebiet der molekularen Genetik wurden nun zahlreiche Gendefekte im Gebiet der Ichthyosen aufgeklärt. Dadurch trat die Komplexität der Ichthyosen zutage, wobei ähnliche oder gleiche Phänotypen durch Mutationen in verschiedenen Genen verursacht werden können, währenddessen umgekehrt einzelne Gene in verschiedenen, zum Teil stark divergierenden Phänotypen resultieren können. Daher wurde eine neue Klassifizierung notwendig, die klinische und neue molekulargenetische Erkenntnisse berücksichtigt und vereint. In dieser Publikation folgen wir größtenteils der Einteilung, die anlässlich der ersten Ichthyosis Consensus Conference in Sorèze, Frankreich, festgelegt wurd

Quantum Hypergraph States

We introduce a class of multiqubit quantum states which generalizes graph states. These states correspond to an underlying mathematical hypergraph, i.e. a graph where edges connecting more than two vertices are considered. We derive a generalised stabilizer formalism to describe this class of states. We introduce the notion of k-uniformity and show that this gives rise to classes of states which are inequivalent under the action of the local Pauli group. Finally we disclose a one-to-one correspondence with states employed in quantum algorithms, such as Deutsch-Jozsa's and Grover's.Comment: 9+5 pages, 5 figures, 1 table, published versio

A gobal fit to the anomalous magnetic moment, Higgs limit and b->s gamma in the constrained MSSM

New data on the anomalous magnetic moment of the muon together with the b->s gamma decay rate and Higgs limits are considered within the supergravity inspired constrained minimal supersymmetric model. We perform a global statistical chi2 analysis of these data and show that the allowed region of parameter space is bounded from below by the Higgs limit, which depends on the trilinear coupling and from above by the anomalous magnetic moment.Comment: 3 pages, To appear in Proc. of SUSY01, Dubna (Russia