Spin characterization of systematics in CMB surveys – a comprehensive formalism

The CMB B-mode polarization signal – both the primordial gravitational wave signature and the signal sourced by lensing – is subject to many contaminants from systematic effects. Of particular concern are systematics that result in mixing of signals of different ‘spin’, particularly leakage from the much larger spin-0 intensity signal to the spin-2 polarization signal. We present a general formalism, which can be applied to arbitrary focal plane setups, that characterizes signals in terms of their spin. We provide general expressions to describe how spin-coupled signals observed by the detectors manifest at map-level, in the harmonic domain, and in the power spectra, focusing on the polarization spectra – the signals of interest for upcoming CMB surveys. We demonstrate the presence of a previously unidentified cross-term between the systematic and the intrinsic sky signal in the power spectrum, which in some cases can be the dominant source of contamination. The formalism is not restricted to intensity to polarization leakage but provides a complete elucidation of all leakage including polarization mixing, and applies to both full and partial (masked) sky surveys, thus covering space-based, balloon-borne, and ground-based experiments. Using a pair-differenced setup, we demonstrate the formalism by using it to completely characterize the effects of differential gain and pointing systematics, incorporating both intensity leakage and polarization mixing. We validate our results with full time ordered data simulations. Finally, we show in an Appendix that an extension of simple binning map-making to include additional spin information is capable of removing spin-coupled systematics during the map-making process

Electronic properties of electron-deficient Zn(II) porphyrins for HBr splitting

Two different high potential Zn(II) porphyrin designs carrying either 4 or 5 meso pentafluorophenyl moieties as electron acceptor groups and a further electron withdrawing branch inserted in either the \u3b2 (1) or meso (2) position were tested in photoelectrosynthetic cells for HBr splitting. Photoaction spectra in the presence of HBr showed that red photons up to 700 nm could be harvested and converted and that 2 performed better than 1, thanks to better electronic properties of the excited state, favored by the insertion of the benzothiadiazole electron withdrawing group. Photoanodic performances in the presence of HBr, however, remained low, due to inefficient regeneration of the oxidized sensitizer as a result of an insufficient driving force for Br- oxidation

Informática y tecnologías emergentes

Las tecnologías emergentes son innovaciones en desarrollo que como su nombre lo dice en un futuro cambiarán la forma de vivir del ser humano brindándole mayor facilidad a la hora de realizar sus actividades. Estas tecnologías innegablemente están modelando nuestra sociedad, nuestras costumbres, la forma de relacionarnos y comunicarnos, la forma en la que las empresas producen, la forma en la que se educa. Hemos pasado de un modelo de sociedad industrial a un modelo de producción del conocimiento donde las demandas de las tanto de las empresas como de la sociedad, han cambiado. Incluso el modo de interactuar con esta tecnología está cambiando. Hoy en día esa interacción es mucho más dinámica dando al usuario un rol activo, convirtiendo al mismo usuario en parte de la tecnología. El proyecto descripto en este documento tiene como propósito identificar, contextualizar, evaluar, desarrollar y aplicar diversas herramientas informáticas en tecnologías emergentes, las cuales tendrán un impacto en forma directa en áreas tales como: telecomunicaciones, salud, seguridad, gobierno, educación, industria, entre otras. El trabajo se cimentará en cuatro ejes fundamentales: tecnologías exponenciales (IT), tratamiento masivo de datos (big data), tecnología en educación (e-tecnología), y robótica e interacción hombre-máquina (HCI).Eje: Innovación en Sistemas de Software.Red de Universidades con Carreras en Informática (RedUNCI

KiDS and Euclid: Cosmological implications of a pseudo angular power spectrum analysis of KiDS-1000 cosmic shear tomography

Large scale structure and cosmolog

Reconstructing the gravitational lensing potential from the Lyman- \u3b1 forest

We demonstrate a method for reconstructing the weak lensing potential from the Lyman-\u3b1 forest data. We derive an optimal estimator for the lensing potential on the sky based on the correlation between pixels in real space. This method effectively deals with irregularly spaced data, holes in the survey, missing data, and inhomogeneous noise. We demonstrate an implementation of the method with simulated spectra and weak lensing. It is shown that with a source density of 0.5 per square arcmin and 3c200 pixels in each spectrum (\u3bb/\u394\u3bb = 1300) the lensing potential can be reconstructed with high fidelity if the relative absorption in the spectral pixels is signal dominated. When noise dominates the measurement of the absorption in each pixel the noise in the lensing potential is higher, but for reasonable numbers of sources and noise levels and a high fidelity map the lensing potential is obtainable. The lensing estimator could also be applied to lensing of the cosmic microwave background, 21 cm intensity mapping, or any case in which the correlation function of the source can be accurately estimated

Structural, spectral, electric-field-induced second harmonic, and theoretical study of Ni(II), Cu(II), Zn(II) ancd VO(II) complexes with [N2O2]unsymmetrical Schiff Bases of S-Methylisothiosemicarbazide Derivatives

New unsymmetrical [N2O2] tetradentate Schiff base complexes of Ni(II), Cu(II), Zn(II), and VO(II) were synthesized by template condensation of the tetradentate precursor 1-phenylbutane-1,3-dione mono-S-methylisothiosemicarbazone with o-hydroxybenzaldehyde or its 5-phenylazo derivative. They were characterized by elemental analysis, IR, UV-vis, electron spin resonance, and NMR spectroscopy, mass spectrometry, and magnetic measurements. The crystal structures of five of them have been determined by X-ray diffraction using, in some cases, synchrotron radiation. These compounds are characterized by a large thermal stability; their decomposition temperatures range from 240 up to 310\ub0C. Complexes with the phenylazo substituent were found to possess a large second-order nonlinear optical (NLO) response, as determined both by measurements of solution-phase direct current electricfield-induced second harmonic generation and by theoretical time-dependent density functional theory (TDDFT) calculations. The molecular hyperpolarizability was found to decrease in the order Zn(II) > Cu(II) > Ni(II) ~ VO(II). The active role of the metal in determining the NLO properties of the complexes was shown through an analysis of their UV-vis spectra, which revealed the presence of metal-to-ligand (in closed-shell complexes) and ligandto- metal (in open-shell complexes) charge-transfer bands together with intra-ligand charge-transfer transitions. Assignment of the bands was based on the analysis of the TDDFT computed spectra