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: Ralf Heilmann | 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: 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 […]