Simulations and symmetries

We investigate the range of applicability of a model for the real-space power spectrum based on N-body dynamics and a (quadratic) Lagrangian bias expansion. This combination uses the highly accurate particle displacements that can be efficiently achieved by modern N-body methods with a symmetries-based bias expansion which describes the clustering of any tracer on large scales.We showthat at lowredshifts, and formoderately biased tracers, the substitution of N-body-determined dynamics improves over an equivalent model using perturbation theory by more than a factor of two in scale, while at high redshifts and for highly biased tracers the gains are more modest. This hybrid approach lends itself well to emulation. By removing the need to identify haloes and subhaloes, and by not requiring any galaxy-formation-related parameters to be included, the emulation task is significantly simplified at the cost ofmodelling a more limited range in scale. 2020 The Author(s)

Positivity in the presence of initial system-environment correlation

The constraints imposed by the initial system-environment correlation can lead to nonpositive Dynamical maps. We find the conditions for positivity and complete positivity of such dynamical maps by using the concept of an assignment map. Any initial system-environment correlations make the assignment map nonpositive, while the positivity of the dynamical map depends on the interplay between the assignment map and the system-environment coupling. We show how this interplay can reveal or hide the nonpositivity of the assignment map. We discuss the role of this interplay in Markovian models.Comment: close to the published version. 5 pages, 1 figur

Reconstructing large-scale structure with neutral hydrogen surveys

Upcoming 21-cm intensity surveys will use the hyperfine transition in emission to map out neutral hydrogen in large volumes of the universe. Unfortunately, large spatial scales are completely contaminated with spectrally smooth astrophysical foregrounds which are orders of magnitude brighter than the signal. This contamination also leaks into smaller radial and angular modes to form a foreground wedge, further limiting the usefulness of 21-cm observations for different science cases, especially cross-correlations with tracers that have wide kernels in the radial direction. In this paper, we investigate reconstructing these modes within a forward modeling framework. Starting with an initial density field, a suitable bias parameterization and non-linear dynamics to model the observed 21-cm field, our reconstruction proceeds by {combining} the likelihood of a forward simulation to match the observations (under given modeling error and a data noise model) {with the Gaussian prior on initial conditions and maximizing the obtained posterior}. For redshifts z=2 and 4, we are able to reconstruct 21cm field with cross correlation, rc > 0.8 on all scales for both our optimistic and pessimistic assumptions about foreground contamination and for different levels of thermal noise. The performance deteriorates slightly at z=6. The large-scale line-of-sight modes are reconstructed almost perfectly. We demonstrate how our method also provides a technique for density field reconstruction for baryon acoustic oscillations, outperforming standard methods on all scales. We also describe how our reconstructed field can provide superb clustering redshift estimation at high redshifts, where it is otherwise extremely difficult to obtain dense spectroscopic samples, as well as open up a wealth of cross-correlation opportunities with projected fields (e.g. lensing) which are restricted to modes transverse to the line of sight

Stroke and HIV - casual or coincidental co-occurrence?

No Abstract. South African Medical Journal Vol. 96 (12) 2006: pp.1247-124

Quantum discord bounds the amount of distributed entanglement

The ability to distribute quantum entanglement is a prerequisite for many fundamental tests of quantum theory and numerous quantum information protocols. Two distant parties can increase the amount of entanglement between them by means of quantum communication encoded in a carrier that is sent from one party to the other. Intriguingly, entanglement can be increased even when the exchanged carrier is not entangled with the parties. However, in light of the defining property of entanglement stating that it cannot increase under classical communication, the carrier must be quantum. Here we show that, in general, the increase of relative entropy of entanglement between two remote parties is bounded by the amount of non-classical correlations of the carrier with the parties as quantified by the relative entropy of discord. We study implications of this bound, provide new examples of entanglement distribution via unentangled states and put further limits on this phenomenon.Comment: 8 pages, 1 figure, RevTeX4; Accepted for publication in Phys. Rev. Let

Farmakokinetika eprinomektina u ovaca nakon potkožne primjene.

The pharmacokinetics of eprinomectin was determined in lactating sheep following subcutaneous administration at a dose rate of 0.2 mg kg-1. The eprinomectin concentration in plasma was determined using High Performance Liquid Chromatography (HPLC) with a fluorescence detector. The kinetics of plasma concentrations were analysed using the non-compartment model. The maximum plasma concentration of 24.44 ng/mL occurred 2 days post-administration. Following subcutaneous administration of eprinomectin in sheep, the value of plasma elimination half-life, the area under the plasma concentration time curve (AUC) and mean residence time (MRT) were 388.52 ± 0.25 h. 4282.10 ng.h/mL and 374.50 h, respectively. The values of V (area), Vd(ss) and Cl(B) were 20.50 mL/kg, 13.70 mL/kg and 0.04 mL/h/kg, respectively. This study demonstrates that subcutaneous administration of eprinomectin led to higher bioavailability and longer mean residence time with a lower dose than a pour-on application, and that an injectable formulation may be applied in lactating sheep with zero withdrawal period.Farmakokinetika eprinomektina određivana je u ovaca u laktaciji nakon potkožne primjene u dozi od 0,2 mg/kg. Njegova koncentracija u plazmi utvrđena je visoko učinkovitom tekućinskom kromatografijom s fluorescentnim detektorom. Kinetika koncentracija u plazmi analizirana je na osnovi modela bez odjeljaka. Najveća koncentracija u plazmi od 24,44 ng/mL dokazana je dva dana nakon primjene. Poluživot eliminacije iz plazme iznosio je 388,52 ± 0,25 sati, površina ispod krivulje koncentracije u plazmi (AUC) 4282,10 ng/h/mL, a prosječno vrijeme zadržavanja iznosilo je 374,50 sati. Vrijednost prividnog volumena raspodjele, Vd(area), iznosila je 20,50 mL/kg, prosječni vidljivi volumen raspodjele, Vd(ss), 13,70 mL/kg, a ukupni klirens 0,04 mL/sat/kg. Istraživanje je pokazalo da potkožna primjena eprinomektina pruža veću bioraspoloživost, duže vrijeme zadržavanja s manjom dozom u odnosu na veliku te da se injekcijska formulacija može primijeniti u ovaca u laktaciji

New Deal Art: California

Traditionally, the years of the New Deal projects have been treated as a part of the Depression experience with an emphasis on their economic and social dimensions. Until recently, sporadic interest in the art of the period has usually focused on individual artists, not general movements in the art of the time. This has been particularly true in the western states. The purpose of the New Deal Art: California exhibition was to create an overview of the New Deal art projects by bringing together examples of art from the federal art programs in California. New Deal Art: California came about as the result of a chance remark made, by Dr. Francis V. O\u27Connor, Art Historical Consultant, on his first trip to the de Saisset Art Gallery and Museum in 1971. The original exploratory research he did revealed a wealth of information about California\u27s contribution to the Works Progress Administration\u27s Federal Art Project and the Treasury Programs. Dr. O\u27Connor\u27s initial work helped provide the foundation for two years of subsequent research into the historical and aesthetic climate that gave birth to New ,Deal Art in California. The results of our explorations, in both quantity and quality of resources, has far exceeded our original expectations.https://scholarcommons.scu.edu/faculty_books/1367/thumbnail.jp

Foundations of Quantum Discord

This paper summarizes the basics of the notion of quantum discord and how it relates to other types of correlations in quantum physics. We take the fundamental information theoretic approach and illustrate our exposition with a number of simple examples.Comment: 3 pages, special issue edited by Diogo de Oliveira Soares Pinto et a