Kavli Affiliate: Kent Irwin | Summary:Searches for QCD axions with masses in the neV/$c^2$ mass range are strongly motivated by new physics at the GUT scale and by well-motivated pre-inflationary axion symmetry breaking scales. This parameter space is challenging to probe due to the small axion-photon couplings, which typically require large, high-field magnets with substantial […]
Kavli Affiliate: Daniel R. Wilkins | Summary:Recent XRISM observations of active galactic nuclei such as PDS 456 have revealed “forests” of absorption lines best modeled by five distinct absorption zones with varying large blueshifts. We propose a model in which these relativistic blueshifts originate from the motion of the accretion disc itself, rather than from […]
Kavli Affiliate: Susan Clark | Summary:We present a distance-resolved reconstruction of the local line-of-sight Galactic magnetic field, $B_$, by combining a 3D electron density ($n_e$) map derived from dust map-informed simulations and a full-sky map of Faraday rotation measure (RM). The forward model evaluates RM on the same 3D grid as the $n_e$ map and […]
Kavli Affiliate: Nicola Omodei | Summary:The Crab pulsar experienced two relatively small glitches separated by only 20 days in September and October 2025. IXPE observed the source twice, with delay times since the glitch epoch ranging between 35 and 75 days, depending on the observation. We carried out a multi-method analysis to investigate whether there […]
Kavli Affiliate: Steven Kahn | Summary:We present Rubin Data Preview 1 DP1, the first data from the NSF DOE Vera C Rubin Observatory, comprising raw and calibrated single epoch images, coadds, difference images, detection catalogs, and ancillary data products. DP1 is based on 1792 optical near infrared exposures acquired over 48 distinct nights by the […]
Kavli Affiliate: Roger Romani | Summary:We present a model for pulsar filaments – a class of narrow X-ray nebulae misaligned with the proper motion, powered by pulsar-generated $e^pm$. We suggest that cosmic ray-enhanced turbulence drives pitch-angle scattering and dominates $e^pm$ motion along the filament; highly amplified magnetic fields are not required. A simulation built on […]
Kavli Affiliate: Roger Romani | Summary:Solid state athermal phonon calorimeters used in the search for low mass dark matter or coherent neutrino-nucleus interactions have long observed a large excess of events below several hundred eV. The relaxation of damage created by the interaction of fast cosmic ray neutrons with the detector has been proposed as […]
Kavli Affiliate: Susan Clark | Summary:We present a comprehensive polarimetric study of 26 nearby molecular clouds in four far-infrared bands (53 $μ$m to 214 $μ$m) using 52 archival SOFIA/HAWC+ datasets. Far-infrared dust polarization observations probe the plane-of-sky magnetic field. To investigate scale-dependent trends, we group the molecular clouds by distance and analyze the data at […]
Kavli Affiliate: Kent Irwin | Summary:We present the first constraints on multipole-dependent cosmic birefringence using CMB polarization data from the BK18 dataset, which combines observations from BICEP2, Keck Array, and BICEP3 at frequencies of 95, 150, and 220 GHz. Photon coupling to an axion-like field leads to the rotation of CMB polarization, inducing non-zero EB […]
Kavli Affiliate: Kent Irwin | Summary:We present the first constraints on multipole-dependent cosmic birefringence using CMB polarization data from the BK18 dataset, which combines observations from BICEP2, Keck Array, and BICEP3 at frequencies of 95, 150, and 220 GHz. Photon coupling to an axion-like field leads to the rotation of CMB polarization, inducing non-zero EB […]