Kavli Affiliate: Luis Ho | Summary:A major question about JWST’s little red dots (LRDs) at $zsim4-8$ is the origin of their apparent X-ray weakness. Even deep Chandra stacks yield only tentative detections or broad-band limits and cannot distinguish among super-Eddington accretion, intrinsic X-ray weakness, and Compton-thick (CT) obscuration. Local analogs offer a powerful complementary route. […]
Kavli Affiliate: Kiyoshi Masui | Summary:Population studies of fast radio burst (FRB) repetition typically model sources using a single distribution of steady, time-averaged burst rates, yet individual sources show significant departures from this assumption. Here we present FRB 20210601A, a source discovered by the Canadian Hydrogen Intensity Mapping Experiment FRB project (CHIME/FRB) that represents the […]
Kavli Affiliate: Masahito Yamazaki | Summary:We determine the surface-defect difference operators of the 4d $mathcalN=2$ lens space index for class $mathcalS$ theories of type $A_N-1$ on $(mathbbS^3/mathbbZ_r)timesmathbbS^1$. For generic fugacities $(p,q,t)$ and arbitrary rank $N$, orbifold order $r$ and discrete holonomies, their coefficients are finite products of theta functions with nomes $p^r$ and $q^r$. After […]
Kavli Affiliate: David W. Miller | Summary:Free-space optical interconnects can support many low-data-rate channels while avoiding the cost, energy consumption, and packaging constraints of optical waveguide- or fiber-based systems that are widely used today. We propose a free-space optical interconnect system based on reconfigurable micromirror arrays, and show that it scales favorably due to its […]
Kavli Affiliate: Clarence Chang | Summary:Parametric amplification enables sensitive microwave detection and signal processing by amplifying weak signals with minimal added noise. Here, we demonstrate kinetic inductance mediated parametric amplification in a hybrid magnonic system comprising a nonlinear NbN nanowire resonator strongly coupled to a yttrium iron garnet sphere. The resonator exhibits four wave mixing […]
Kavli Affiliate: Claudio Ricci | Summary:Unresolved millimeter (mm) emission is observed in radio-quiet (RQ) Active Galactic Nuclei (AGN), but its physical origin remains debated. Self-absorbed synchrotron emission from the compact X-ray corona is one of the leading candidates. Previous support for this coronal synchrotron origin has mainly been based on variability and spectral indices in […]
Kavli Affiliate: Masahito Yamazaki | Summary:We study the vacuum structure of flux compactifications of type IIB string theory on the degree 18 hypersurface in $mathbbCP^4_1,1,1,6,9$ with two effective complex structure moduli. We scan $30,770,178$ flux choices compatible with the tadpole bound, and use a gradient-based constrained minimization based on the SLSQP algorithm to identify candidates […]
Kavli Affiliate: Mark Vogelsberger | Summary:The ionizing radiation that galaxies release into their surroundings depends on whether efficient Lyman continuum (LyC) escape coincides with strong photon production. Stellar feedback can open escape paths as the source population fades, linking the escaping radiation to a galaxy’s recent history. We investigate this timing in thirteen high-redshift (z […]
Kavli Affiliate: Kaisey Mandel | Summary:Photometric Type Ia supernova (SN Ia) cosmology in the era of the Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST) demands statistical frameworks that simultaneously account for selection effects, photometric redshift uncertainties and non-Ia contamination at scale. We present FlowSN2, a modular statistical framework combining hierarchical Bayesian […]
Kavli Affiliate: John Silverman | Summary:We investigate how cluster environments affect galaxy star formation, structure, and stellar populations using spectroscopically-confirmed galaxies in X-ray-selected eROSITA clusters, that have deep HSC-SSP imaging and DESI DR1 spectroscopy. At 0.1<z<0.5, we compare dust-corrected Ha star formation rates (SFRs), effective radii (Re), bulge-to-total light ratios (B/T), and Dn4000 between cluster […]