Experimental Observation of a Fundamental Length Scale of Waves in Random Media

Waves propagating through a weakly scattering random medium show a pronounced branching of the flow accompanied by the formation of freak waves, i.e., extremely intense waves. Theory predicts that this strong fluctuation regime is accompanied by its own fundamental length scale of transport in random media, parametrically different from the mean free path or the localization length. We show numerically how the scintillation index can be used to assess the scaling behavior of the branching length. We report the experimental observation of this scaling using microwave transport experiments in quasi-two-dimensional resonators with randomly distributed weak scatterers. Remarkably, the scaling range extends much further than expected from random caustics statistics.Comment: 5 pages, 5 figure

Stau as the Lightest Supersymmetric Particle in R-Parity Violating SUSY Models: Discovery Potential with Early LHC Data

We investigate the discovery potential of the LHC experiments for R-parity violating supersymmetric models with a stau as the lightest supersymmetric particle (LSP) in the framework of minimal supergravity. We classify the final states according to their phenomenology for different R-parity violating decays of the LSP. We then develop event selection cuts for a specific benchmark scenario with promising signatures for the first beyond the Standard Model discoveries at the LHC. For the first time in this model, we perform a detailed signal over background analysis. We use fast detector simulations to estimate the discovery significance taking the most important Standard Model backgrounds into account. Assuming an integrated luminosity of 1 inverse femtobarn at a center-of-mass energy of 7 TeV, we perform scans in the parameter space around the benchmark scenario we consider. We then study the feasibility to estimate the mass of the stau-LSP. We briefly discuss difficulties, which arise in the identification of hadronic tau decays due to small tau momenta and large particle multiplicities in our scenarios.Comment: 26 pages, 18 figures, LaTeX; minor changes, final version published in PR

I am more who I am here than I am anywhere : an ethnographic study of the influences of safety and connection on the co-constructions of gender and sexual orientation identities in adolescents in small groups.

Modernists theorists propose that one\u27s self is fragmented, invisible, or false when one shows different versions of one\u27s self in various situations. Believing this, Modernists further suppose that with respect to one\u27s gender or sexual orientation identity, one is either appropriately representing one\u27s biological gender and earliest understandings of one\u27s sexual orientation (usually presumed to be heterosexual), or else one is pathological and needs clinical treatment. Poststructuralists look instead at context, and offer a view of the self which takes contextual factors into account, avoiding the pathologizing of anyone\u27s social identity variations. Since identities such as gender and sexual orientation are lived in contexts which include social pressures and restrictions and one\u27s reactions to and actions towards these pressures, emphases also must be placed upon analyzing gender roles and privileges, and the impact these have on one\u27s expectations, apparent choices, and decisions for the living of these social identities. This two-year ethnographic study investigated how gender and sexual orientation identities were continually socially negotiated in two small groups. These groups met as part of a program whose purpose is to offer theatre training, counseling, and performance opportunities for volunteer adolescents. Also investigated were the ways the members\u27 changing perceptions of levels of group and interpersonal connection and safety affected these social identity negotiations, and how the variations in gender and sexual orientation identities were perceived and received by members. Members described the program Norms, of confidentiality, respect, punctuality, commitment, and sobriety, as the main factors which positively guided the members\u27 favorable interactions and created the safe atmosphere. Despite wider cultural backlashes and restrictions, variability in identities occurred frequently among these adolescents; negative attitudes about social identities, with rigidity and intolerance, characterized many of their early group interactions. Most research on social identities usually presents development as consisting of stages, with clashes among those at different stages offered as the cause for most identity-based social problems. The participants co-created the theory that liberational, and authentic gender and sexual orientation identities may be co-constructed. Differential Authenticity describes the ways program participants flexibly lived these social identities

Nonlinear Dynamics of Composite Fermions in Nanostructures

We outline a theory describing the quasi-classical dynamics of composite fermions in the fractional quantum Hall regime in the potentials of arbitrary nanostructures. By an appropriate parametrization of time we show that their trajectories are independent of their mass and dispersion. This allows to study the dynamics in terms of an effective Hamiltonian although the actual dispersion is as yet unknown. The applicability of the theory is verified in the case of antidot arrays where it explains details of magnetoresistance measurements and thus confirms the existence of these quasiparticles.Comment: submitted to Europhys. Lett., 4 pages, postscrip

Statistical evidence that honeybees competitively reduced wild bee abundance in the Munich Botanic Garden in 2020 compared to 2019

In a commentary on our paper (Renner et al., Oecologia 195:825-831, 2021), Harder and Miksha lay out why they think that our finding of higher honeybee abundances reducing wild bee abundances in an urban botanical garden is not statistically supported. Here, we explain the statistical test provided in our paper, which took advantage of a natural experiment offered by 2019 being a poorer year for bee keeping than 2020

A family of entire functions with Baker domains

In his paper [The iteration of polynomials and transcendental entire functions. J. Aust. Math. Soc. (Series A) 30 (1981), 483–495], Baker proved that the function f defined by f(z) = z+(sin?z/?z)+c has a Baker domain for c sufficiently large. In this paper we use a novel method to prove that f has a Baker domain for all c>0. We also prove that there exists an open unbounded set contained in the Baker domain on which the orbits of points under f are asymptotically horizontal