HAL-IN2P3
Not a member yet
78719 research outputs found
Sort by
Effets des animaux de compagnie sur la santé des personnes âgées : une enquête en Île-de-France
No full textInternational audienceAlors que les populations humaines tendent à vieillir de plus en plus, il devient essentiel d’identifier des leviers favorisant le bien-être des personnes âgées. Cette étude explore le rôle des animaux de compagnie dans le vieillissement en bonne santé à partir d’une enquête menée auprès de 230 personnes âgées de 62 à 93 ans en Île-de-France. Les données, recueillies par entretien à l’aide du questionnaire CAPI HANC-MINDMAP, ont permis d’analyser les effets directs et indirects de la possession d’animaux sur la santé physique et mentale des personnes interrogées. Les résultats montrent que les chiens et les chats influencent différemment la cohésion sociale et l’environnement de vie de leurs propriétaires : les chiens favorisent les interactions de quartier et l’activité physique, tandis que les chats renforcent les liens affectifs au sein du foyer. Les animaux améliorent aussi le bien-être psychologique en réduisant la solitude et en élargissant les réseaux sociaux, bien que certains propriétaires signalent un stress lié aux soins. L’étude souligne le rôle des animaux de compagnie en tant qu’interventions non médicamenteuses sur le bien-être des personnes, à la fois sources de soutien mais aussi de défis, et encourage leur intégration dans les stratégies de politiques publiques du bien-vieillir
Experimental determination of organ-specific fast neutron equivalent dose from modern radiotherapy LINACs
No full textInternational audienc
The Tianlai-WIYN North Celestial Cap Redshift Survey
No full textInternational audienceWe present the results of a small, low redshift spectroscopic survey of galaxies within 3 degrees of the North Celestial Pole (NCP) selected using V-band photometry obtained from the North Celestial Cap Survey (NCCS) (Gorbikov & Brosch 2014). The purpose of the current survey is to create a redshift space template for 21 cm emission from neutral hydrogen with which to correlate radio line intensity observations by the Tianlai dish and cylinder interferometers. A total of 898 redshifts were obtained from the 2102 extended objects in the NCCS with m_V < 19 in the survey area. After accounting for extinction, the survey geometry and selection effects, the number density and clustering pattern of galaxies in the redshift catalog are consistent with other low redshift surveys. We were also able to identify 11 galaxy cluster candidates from this redshift catalog
Holographic shear correlators at low temperatures, and quantum
No full textInternational audienceThe strongly-coupled 3-dimensional theory, holographically dual to black branes at fixed chemical potential \muext and temperature is considered in AdS Einstein-Maxwell theory. The retarded Green's functions at frequency is calculated using holography in the regime ω, T \ll \muext but otherwise arbitrary. When the transverse space has finite volume, there is a non-zero energy scale , scaling as for large , below which quantum-gravitational corrections due to the fluctuations of the nearly-gapless Schwarzian modes become important. Such corrections to the retarded Green's function are calculated at different relative values of , , and . The limit is used to define the shear viscosity . As the temperature is lowered below , quantum corrections are found to increase the value of with respect to its semiclassical value. The quantum-corrected result for diverges as at , in accord with corresponding results for the absorption cross section. The quantum result for the ratio , where is the entropy density, dips below the semiclassical limit of when , then turns back to increase towards lower temperatures, and finally diverges at temperatures much below
Aerogel RICH Counter at the Belle II Detector
No full textInternational audienceWe report on the design, operation, and performance of a novel proximity-focusing Ring Imaging Cherenkov (RICH) detector equipped with a multilayer focusing aerogel radiator, developed for the forward region of the Belle II spectrometer at the SuperKEKB collider. The system achieves effective separation of charged pions, kaons, and protons across the full kinematic range of the experiment, from 0.5 GeV/c to 4 GeV/c. To date, the detector has successfully operated in data-taking, contributing to the collection and analysis of nearly 600/fb of Belle II collision data
Octupole deformation in quasiparticle states of odd-mass and odd-odd nuclei
No full textInternational audienceAs a follow up of [Phys. Scr. 99 055305 (2024)], where we studied axial octupole shapes in two-quasiparticle states of even-even nuclei, we investigate this type of shapes in odd-mass and odd-odd well-deformed nuclei, using the Skyrme-Hartree-Fock-BCS approach with selfconsistent blocking and a constraint on the expectation value of the axial octupole moment operator. To interprete the pattern of the resulting deformation energy curve as a function of , we extend the perturbative mechanism of Ref. [1]. We deduce selection rules which can predict, from the single-particle spectra at , whether in a given multiquasiparticle state the deformation energy curve has a local minimum at a vanishing or a finite value of . The predictions of this perturbative mechanism are compared with actual Skyrme-Hartree-Fock-BCS calculations with a constraint on the expectation value . Overall we obtain a qualitative agreement and we show that quantitative predictions are limited by the role of pairing correlations and strong octupole coupling between quasi-degenerate members of a single-particle parity doublet
Probing scalar and pseudoscalar new physics using rare kaon decays
No full textInternational audienceRare kaon decays provide sensitive tests of new physics. In this work, we focus on scalar and pseudoscalar operators, analysing the and decays. We highlight the complementary role of different modes: , in particular the forward-backward asymmetry in the muon channel as a clean probe of scalar effects, the stringent constraints from , and the discovery potential of future measurements of and . The interplay between charged and neutral modes underscores the complementarity of NA62, the LHCb upgrade, and KOTO-II
First-time assessment of glitch-induced bias and uncertainty in inference of extreme mass ratio inspirals
No full textInternational audienceThis work investigates the impact of streams of transient, non-Gaussian noise artifacts or "glitches" on the parameter estimation of extreme mass ratio inspirals (EMRI) in the Laser Interferometer Space Antenna (LISA). Glitches cause biased and less precise inference for short-duration signals such as massive black hole binaries, but their effect on long-lived sources such as EMRIs has not been quantified. Using simulated LISA observations containing injected EMRIs and streams of shapelet-based glitches drawn from the LISA Pathfinder catalog, we estimate the glitch-induced parameter biases and uncertainties through a Fisher-matrix-based analysis whose accuracy we verify with Markov-Chain Monte Carlo. We find that moderately mitigated glitch streams i.e. ones containing only glitches of up to moderate SNRs () induce negligible to minor biases in the inferred EMRI parameters. In contrast, weakly mitigated glitch streams containing higher-SNR events () can produce biases nearing . These results demonstrate that, when compared to inference of other sources such as massive black hole binaries, EMRI inference is notably more robust to glitches. We stress that at least some amount of glitch modeling and mitigation remains essential for unbiased EMRI analyses in the LISA era
An effective -Szekeres modelling of the local Universe with Cosmicflows-4
No full textInternational audienceWe develop an effective description of the local cosmic environment, namely, for redshift , to quantify the bias induced by local structure on cosmological observables. Our approach models the metric of the nearby Universe as a superposition of multi-structured -Szekeres patches, calibrated against the HAMLET peculiar velocity and density field reconstructions of Cosmicflows-4. From this framework we compute the fully inhomogeneous and anisotropic quasilocal expansion field predicted by our model, and use it to assess the impact of local structure on estimates of . For this purpose we analyse low-redshift Type Ia supernovae from the Pantheon+ catalogue. We find that accounting for the local structure increases the Hubble tension, yielding a shift in the best-fit value of the Hubble constant of order
On the coverage of electroweak-inos within the pMSSM with SModelS -- a comparison with the ATLAS pMSSM study
No full textInternational audienceThe ATLAS collaboration has recently performed a vast scan of the phenomenological Minimal Supersymmetric Standard Model (pMSSM) with a focus on the electroweak-ino sector, and analysed how their Run 2 searches for electroweak production of supersymmetric (SUSY) particles constrain this dataset. All the SLHA files from the scan as well as the constraints from the eight individual searches considered by ATLAS were made publicly available. We use this material to study how well the ATLAS constraints can be reproduced with SModelS v3.0. Moreover, we explore how the picture changes when also including CMS results, and what can be gained by the statistical combination of analyses. Finally, we discuss the part of parameter space with light electroweak-inos that remains valid despite the stringent LHC limits. Our results underscore the need of a broad, multifaceted approach for maximising sensitivity and closing loopholes in the extensive SUSY parameter space