Kavli Affiliate: Anthony Lasenby | Summary:For the Fierz-Pauli action the Bessel-Hagen construction does not produce a preferred local gauge-invariant energy-momentum tensor; it identifies only a gauge-invariant equivalence class of Noether currents, because the action is built from first derivatives of $h_μν$ whereas the first local gauge-invariant spin-2 field strength, the curvature, contains two. It is […]
Kavli Affiliate: Marshall Bautz | Summary:Next-generation strategic X-ray astronomy missions will require the simultaneous achievement of high angular resolution, large effective collecting area, and wide-field imaging with large-format focal plane detectors. Realizing the associated science objectives–ranging from precision measurements of bright point sources to the detection and characterization of faint diffuse emission-places stringent and, in […]
Kavli Affiliate: Moritz Guenther | Summary:The Globe Orbiting Soft X-ray Polarimeter (GOSoX) is a spectropolarimeter for the soft X-ray band. GOSoX is based on the Rocket Experiment Demonstration of a Soft X-ray Polarimeter (REDSoX), a NASA-funded sounding rocket payload. Like REDSoX, GOSoX consists of Wolter I X-ray optics from NASA/MSFC, critical-angle transmission (CAT) gratings made […]
Kavli Affiliate: Jeanne Paz | Authors: Isaac Y.M. Chang and Jeanne T. Paz | Summary: Coordinated movement relies on interactions between the basal ganglia and the thalamus, yet the circuits linking these structures are not fully understood. Here, we dissect a non-canonical basal ganglia output pathway, from the external globus pallidus (GPe) to the […]
Kavli Affiliate: Stefano Fusi | Authors: Nicholas Menghi, Simone Vigano’, William Jeffrey Johnston, Salma Elnagar, Stefano Fusi and Christian F Doeller | Summary: Learning depends not only on the content of what we learn, but also on how we learn and on how experiences are structured over time. To investigate how task similarity and […]
Kavli Affiliate: Catherine Grant | Summary:Advanced algorithms incorporating artificial intelligence and machine learning (AI/ML) enhance the sensitivity of X-ray imaging detectors and the scientific capabilities of future X-ray missions. In orbit, current instruments are limited in their sensitivity by (1) the instrumental background, induced by cosmic rays which produce signals that can be confused for […]
Kavli Affiliate: Matthew Fisher | Summary:Equipped with the recently recognized symmetry structure of mixed states of matter and "strong-weak spontaneous symmetry breaking" (SW-SSB), we develop a quantum particle-vortex duality of emergent model-F and model-A hydrodynamics of 2d boson/rotor systems. This duality relation demonstrates that classical hydrodynamics of 2d bosons can be described in terms of […]
Kavli Affiliate: Matthew Fisher | Summary:Equipped with the recently recognized symmetry structure of mixed states of matter and "strong-weak spontaneous symmetry breaking" (SW-SSB), we develop a quantum particle-vortex duality of emergent model-F and model-A hydrodynamics of 2d boson/rotor systems. This duality relation demonstrates that classical hydrodynamics of 2d bosons can be described in terms of […]
Kavli Affiliate: Alexander Ji | Summary:We present the discovery of Aquarius IV (Rubin J2201$-$0234) — the first ultra-faint Milky Way satellite to be identified using data from the Vera C. Rubin Observatory. This system was detected at $sim$8$σ$ significance using Rubin Early Data Preview 2 (EDP2) photometry and independently confirmed at $sim$6$σ$ significance in archival […]
Kavli Affiliate: Claudio Ricci | Summary:Compton-thick Active Galactic Nuclei (AGN) represent one of the most elusive phases of massive black hole growth, yet are expected to contribute substantially to the Cosmic X-ray Background and the integrated growth of massive black holes. NGC 4945 is the closest Compton-thick AGN and amongst the brightest AGN in the […]