Kavli Affiliate: Maria Monzani | Summary:In this article we describe Cohort Organized Learning (CoOL), a method for clustering data without explicit distance or similarity computations. Herein, we will describe CoOL, derive the gradients determined by expectation maximization to train the networks, show how to monitor convergence during training and evaluate the clusters after training, and […]
Kavli Affiliate: Roger Romani | Summary:We present the first X-ray polarization measurements of the PSR/PWN complex within SNR Kes 75. Two $rm sim,500,ks$ IXPE observations were conducted in October/November 2024 and April 2025. The second observation yields a significant phase-average 2-8 keV polarization degree $rm PD = 9.9% pm 2.5%$ at $rm PA=36.8^circ pm 7.3^circ$, […]
Kavli Affiliate: Susan Clark | Summary:Highly-localized light-matter interactions are necessary for scaling trapped-ion architectures. In hyperfine qubits, counterpropagating beams generate entangling gates by coupling with motion, but this effect is undesirable during single-qubit operations. For that reason, single-qubit gates are traditionally implemented with copropagating beams, and the coexistence of two beam geometries adds hardware and […]
Kavli Affiliate: Laura Schaefer | Summary:Sub-Neptunes’ molten interiors are expected to accommodate large quantities of volatiles, potentially altering their radius evolution. Previous studies have examined this effect in isolation with simplified evolution modeling, often assuming idealized interior and atmospheric conditions. To address this limitation, we introduce SEAMIST, a unified evolution model for sub-Neptunes and super-Earths […]
Kavli Affiliate: Susan Clark | Summary:We present an approach based on tensor networks for distributed quantum computing simulation of chemical wavepacket dynamics in a continuous variable representation. The central idea is that the tensor-network representation of the multidimensional time-evolution operator naturally induces an elevated Hilbert space where the dynamics decomposes into a set of independent […]
Kavli Affiliate: Susan Clark | Summary:Gaussian processes are a powerful tool for modeling continuous fields, but their naive $mathcalO(N^3)$ computational cost and $mathcalO(N^2)$ memory requirement often limit their practical use. Vecchia’s approximation is a sparse precision matrix approximation for stationary, decaying kernels that conditions each point only on its $k$ nearest neighbors. We present GraphGP, […]
Kavli Affiliate: Susan Clark | Summary:Magnetic fields permeate the multiphase interstellar medium (ISM), yet their phase-dependent structure remains poorly constrained by observations. Dust polarization and ionH1 emission together offer complementary probes of the plane-of-sky magnetic field and cold neutral medium (CNM) gas structure, respectively. Recent observational work has shown that in the diffuse ISM, the […]
Kavli Affiliate: Giorgio Gratta | Summary:We report on the optimization of high voltage vacuum feedthroughs meant to minimize the electric field on the vacuum side of the device. We find that commercial feedthroughs generally have center conductor diameters which are too small, resulting in unnecessarily large fields. We study the problem with analytical calculations and […]
Kavli Affiliate: Peter Graham | Summary:Paleodetectors have been proposed as a new approach to direct detection of weakly interacting massive particles (WIMPs), through the search for damage tracks in ancient minerals induced by WIMP-nucleon scattering. However, for inelastic dark matter such as the Higgsino, existing paleodetector targets lack sufficiently heavy nuclei to overcome the kinematic […]
Kavli Affiliate: Steven Kahn | Summary:Rare $α$-particle-induced charge clusters appear in LSST images as compact, PSF-like sources with a median FWHM of $0.!!^primeprime95$ and median ellipticity consistent with zero, closely resembling unresolved astrophysical point sources. These events are detected in both dark and science exposures at a rate of approximately $10^-12 mathrmpixel^-1 mathrms^-1$. Their collected […]