The THESAN-ZOOM project: the delayed rise of Lyman continuum escape fractions in bursty high-redshift galaxies

Posted by klaurent MIT, This Week: Astrophysics

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 […]


Continue.. The THESAN-ZOOM project: the delayed rise of Lyman continuum escape fractions in bursty high-redshift galaxies

2Flow2SN: Dusty Supernova Cosmology with Photometric Redshifts and Contamination using Neural Simulation-Based Inference

Posted by klaurent Cambridge, This Week: Astrophysics

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 […]


Continue.. 2Flow2SN: Dusty Supernova Cosmology with Photometric Redshifts and Contamination using Neural Simulation-Based Inference

Electrically Pumped Quadratic-Soliton Mode-Locked Laser in Lithium Niobate Nanophotonics

Posted by klaurent Caltech, This Week: Nanoscience

Kavli Affiliate: Alireza Marandi | Summary:Femtosecond mode-locked lasers are the workhorse of modern photonics, enabling optical atomic clocks, frequency combs, precision spectroscopy, and ultrafast signal processing. Bringing them onto nanophotonic chips promises miniaturized ultrafast systems, yet combining femtosecond pulse generation with electrical pumping remains a major challenge, rooted in a trade-off between the speed and […]


Continue.. Electrically Pumped Quadratic-Soliton Mode-Locked Laser in Lithium Niobate Nanophotonics

The Structural Anatomy of Galaxies: Environmental Dependence of Morphological and Quenching Evolution at 0.1 < z < 0.5

Posted by klaurent This Week: Astrophysics, Tokyo

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 […]


Continue.. The Structural Anatomy of Galaxies: Environmental Dependence of Morphological and Quenching Evolution at 0.1 < z < 0.5

Cosmic Ray Observations using Coincident Scintillator and Radio Signals with the Beamforming Elevated Array for COsmic Neutrinos (BEACON)

Posted by klaurent Chicago, This Week: Astrophysics

Kavli Affiliate: Eric Oberla | Summary:At energies above 100 PeV, coherent radio frequency (RF) emission across the 10 — 1000 MHz band from cosmic particle-induced atmospheric showers becomes increasingly dominant, making radio detection a powerful probe at ultrahigh energies. The Beamforming Elevated Array for COsmic Neutrinos (BEACON) considers mountaintop phased radio arrays to monitor large […]


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Alleviating CMB-BAO tension with a large cosmic birefringence angle during reionization induced by energy injection to axion-like particles

Posted by klaurent Cambridge, This Week: Astrophysics

Kavli Affiliate: Blake Sherwin | Summary:The recent measurement of baryon acoustic oscillations by the Dark Energy Spectroscopic Instrument reveals a mild tension with observations of the cosmic microwave background (CMB) within the standard $Λ$CDM cosmological model. Another interesting hint beyond standard cosmology arises from recent analyses of Planck polarization data which has been interpreted as […]


Continue.. Alleviating CMB-BAO tension with a large cosmic birefringence angle during reionization induced by energy injection to axion-like particles

HETDEX [OII] galaxies at $z le 0.48$: Growth of structures from power spectrum multipoles

Posted by klaurent This Week: Astrophysics, Tokyo

Kavli Affiliate: Eiichiro Komatsu | Summary:We use the monopole and quadrupole power spectra of [ionO2]-emitting galaxies in the HETDEX Public Data Release 1 to constrain the growth of cosmic structures at $zle0.48$. We interpret the power spectra using a simulation-based model built from the Mucho-Uchuu-1G $N$-body simulation. The best-fit model reproduces the observed power spectra […]


Continue.. HETDEX [OII] galaxies at $z le 0.48$: Growth of structures from power spectrum multipoles

Hereditary Effective Atom Theory for Large-Scale Atomic Structure Prediction

Posted by klaurent Cornell, This Week: Nanoscience

Kavli Affiliate: David Muller | Summary:Predicting the atomic structure of large systems requires simultaneous exploration of atomic positions, species, and, generally, the number of atoms. The combinatorial growth of possible arrangements can make this search difficult even for standard genetic algorithms. We introduce Hereditary Effective Atom Theory (HEAT), which integrates Effective Atom Theory into a […]


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Boot-AVT: Asymptotically Anytime-Valid Testing with Degenerate U-Statistics via Bootstrap

Posted by klaurent Peking, This Week: Astrophysics

Kavli Affiliate: Feng Long| Summary: Many nonparametric tests are based on $U$-statistics that are degenerate under the null hypothesis. We develop Boot-AVT, a bootstrap procedure for asymptotically anytime-valid testing with these statistics. Using Brownian scaling and time inversion for the limiting Gaussian chaos process, we show that logarithmically penalized maxima over observed and future sample […]


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Microlens-Integrated Grating Couplers for Efficient Free-Space Coupling in Silicon Photonics

Posted by klaurent Chicago, This Week: Astrophysics

Kavli Affiliate: David W. Miller | Summary:Grating-coupler arrays are used to couple free-space light into photonic chips, but the space required for tapers and routing waveguides limits their optical fill factor. Microlens arrays can increase the effective fill factor by collecting light over a larger area and focusing it onto each grating. Separately fabricated lens […]


Continue.. Microlens-Integrated Grating Couplers for Efficient Free-Space Coupling in Silicon Photonics