An Analytical Expression for the Hubble diagram of supernovae and gamma-ray bursts

A recent paper by Harmut Traunm\"uller shows that the most adequate equation to interpret the observations on magnitude and redshift from 892 type 1a supernovae would be mu = 5 log[(1+z) ln(1+z)] + const. We discuss this result which is exacly the one we have obtained few years ago when postulating a relation between the speed of light and the expansion of the universe. We also compare our analytical result to the conclusion of Marosi who studied 280 supernovae and gamma-ray bursts in the range 0.1014 < z < 8.1. The difference between his results and ours is at worst of 0.3 %.Comment: 7 pages, 1 figur

Deux mille musiciens et musiciennes d'Église en 1790

Accéder à la collection Muséfrem dans HAL-SHS http://hal.archives-ouvertes.fr/MUSEFREMAll over France, after 1790, a large number of church musicians found themselves without a job and without an income, because of the closure of chapters and abbeys. The documents they gathered, with a view to obtaining a pension or financial help provide a first rate documentation for the knowledge of this profession in the last years of the Ancien Régime. This rich corpus is now preserved both in the Archives Nationales in Paris (Comité ecclésiastique, série DXIX) and the Archives Départementales (série L). It is now the object of nation-wide research aiming at the establishment of a prosopographic data base managed by the Centre d'histoire "Espaces et Cultures" (CHEC, Université Blaise-Pascal, Clermont-Ferrand) within a project funded by the Agence Nationale de la Recherche, MUSÉFREM.Un grand nombre de musiciens d'Église, partout en France, perdent leur poste et leurs revenus à partir de 1790, en raison de la fermeture des chapitres et des abbayes. Les dossiers qu'ils rassemblent dans le but d'obtenir une pension ou un secours constituent une base documentaire de premier ordre pour connaître cette profession dans les dernières années de l'Ancien Régime. Ce riche corpus est aujourd'hui conservé aux Archives nationales à Paris (Comité ecclésiastique, série DXIX) et dans les dépôts départementaux (série L). Il fait l'objet d'une enquête nationale aboutissant à la mise en œuvre d'une base de données prosopographiques gérée par le Centre d'Histoire " Espaces et Cultures " (CHEC, Université Blaise-Pascal, Clermont-Ferrand), dans le cadre d'un projet soutenu par l'Agence nationale de la recherche, MUSÉFREM. Trois articles ont été publiés dans le cadre du programme de recherche Muséfrem, à l'issue du congrès du CTHS à Bordeaux (2009) : Bernard Dompnier, Sylvie Granger et Isabelle Langlois, "Deux mille musiciens et musiciennes d'Église en 1790" (http://halshs.archives-ouvertes.fr/docs/00/49/13/70/PDF/HAL_BORDEAUX_ENQUETE_2009.pdf), Marie-Claire Mussat, "L'itinérance dans la carrière des musiciens d'église" et Bastien Mailhot, Christophe Maillard et Françoise Talvard, "Musique et musiciens des églises de Guyenne en 1790 : bilan d'étape sur l'enquête collective et la base de données" (http://halshs.archives-ouvertes.fr/halshs-00877164)

Twisted-PHS: Using the Product Formula to Solve Approx-SVP in Ideal Lattices

Approx-SVP is a well-known hard problem on lattices, which asks to find short vectors on a given lattice, but its variant restricted to ideal lattices (which correspond to ideals of the ring of integers $\mathcal{O}_{K}$ of a number field $K$) is still not fully understood. For a long time, the best known algorithm to solve this problem on ideal lattices was the same as for arbitrary lattice. But recently, a series of works tends to show that solving this problem could be easier in ideal lattices than in arbitrary ones, in particular in the quantum setting. Our main contribution is to propose a new ``twisted\u27\u27 version of the PHS (by Pellet-Mary, Hanrot and Stehlé 2019) algorithm, that we call Twisted-PHS. As a minor contribution, we also propose several improvements of the PHS algorithm. On the theoretical side, we prove that our Twisted-PHS algorithm reaches the same asymptotic trade-off between runtime and approximation factor as the original PHS algorithm. On the practical side though, we provide a full implementation of our algorithm which suggests that much better approximation factors are achieved, and that the given lattice bases are a lot more orthogonal than the ones used in PHS. This is the first time to our knowledge that this type of algorithm is completely implemented and tested for fields of degrees up to 60

Evolution of Haptoglobin Concentration in Serum during the Early Phase of Acute Myocardial Infarction

Peer Reviewe

(1+3) Covariant Dynamics of Scalar Perturbations in Braneworlds

We discuss the dynamics of linear, scalar perturbations in an almost Friedmann-Robertson-Walker braneworld cosmology of Randall-Sundrum type II using the 1+3 covariant approach. We derive a complete set of frame-independent equations for the total matter variables, and a partial set of equations for the non-local variables which arise from the projection of the Weyl tensor in the bulk. The latter equations are incomplete since there is no propagation equation for the non-local anisotropic stress. We supplement the equations for the total matter variables with equations for the independent constituents in a cold dark matter cosmology, and provide solutions in the high and low-energy radiation-dominated phase under the assumption that the non-local anisotropic stress vanishes. These solutions reveal the existence of new modes arising from the two additional non-local degrees of freedom. Our solutions should prove useful in setting up initial conditions for numerical codes aimed at exploring the effect of braneworld corrections on the cosmic microwave background (CMB) power spectrum. As a first step in this direction, we derive the covariant form of the line of sight solution for the CMB temperature anisotropies in braneworld cosmologies, and discuss possible mechanisms by which braneworld effects may remain in the low-energy universe.Comment: 22 pages replaced with additional references and minor corrections in Revtex4, and accepted for publication in Phys. Rev.

Protocoles d'emploi des cartes conceptuelles au lycée et en formation des maîtres

Le but de cet article est de présenter des exemples d'emploi de construction de cartes conceptuelles comme outil d'enseignement et comme outil de formation. Nous décrivons les expérimentations qui ont permis la mise au point des protocoles pour chacune des situations étudiées.The purpose of this article is to introduce examples of the use of concept mapping construction as a teaching tool and as a tool for the instruction of student teachers. The article describes experiments which were used in the development of protocols established for each of the various situations studied

Closing the loop as an inverse problem: the real-time control of THEMIS adaptive optics

We have taken advantage of the implementation of an adaptive optics system on the Themis solar telescope to implement innovative strategies based on an inverse problem formulation for the control loop. Such an approach encompassing the whole system implies the estimation of the pixel variances of the Shack-Hartmann wavefront sensor, a novel real-time method to extract the wavefront slopes as well as their associated noise covariance, and the computation of pseudo-open loop data. The optimal commands are computed by iteratively solving a regularized inverse problem with spatio-temporal constraints including Kolmogorov statistics. The latency of the dedicated real-time control software with conventional CPU is shorter than 300 $\mu$s from the acquisition of the raw 400 x 400 pixel wavefront sensor image to the sending of the commands

Braneworld Tensor Anisotropies in the CMB

Cosmic microwave background (CMB) observations provide in principle a high-precision test of models which are motivated by M theory. We set out the framework of a program to compute the tensor anisotropies in the CMB that are generated in braneworld models. In the simplest approximation, we show the braneworld imprint as a correction to the power spectra for standard temperature and polarization anisotropies.Comment: Minor corrections and references added. Accepted for publication in Phys. Rev.

New possibilities for research on reef fish across the continental shelf of South Africa

[From introduction] Subtidal research presents numerous challenges that restrict the ability to answer fundamental ecological questions related to reef systems. These challenges are closely associated with traditional monitoring methods and include depth restrictions (e.g. safe diving depths for underwater visual census), habitat destruction (e.g. trawling), mortality of target species (e.g. controlled angling and fish traps), and high operating costs (e.g. remotely operated vehicles and large research vessels. Whereas many of these challenges do not apply or are avoidable in the shallow subtidal environment, the difficulties grow as one attempts to sample deeper benthic habitats. This situation has resulted in a paucity of knowledge on the structure and ecology of deep water reef habitats around the coast of South Africa and in most marine areas around the world. Furthermore, the inability to effectively survey deep water benthic environments has limited the capacity of researchers to investigate connectivity between shallow and deep water habitats in a standardised and comparable fashio