1406 papers
By analyzing 28 sharp-polarity-inversion-line delta sunspots, this study finds that only one originated from a single emerging writhe-kinked flux rope while the others formed through the merging of multiple magnetic regions, leading to the conclusion that such flux ropes are rarely the primary cause of these sunspots and that their genesis typically involves packing opposite-polarity flux via convection downflows.
This study demonstrates that the single-fluid magnetohydrodynamic approximation is a highly accurate and practical tool for modeling Alfvén wave propagation and energy transport in the partially ionized lower solar atmosphere, as it yields results nearly identical to more complex multi-fluid models despite minor discrepancies in high-frequency reflectivity and localized heating rates.
This paper investigates non-minimally coupled scalar field inflation within Loop Quantum Cosmology with inverse-volume corrections, demonstrating that the model's predictions for inflationary observables align with current observational data while the non-minimal coupling significantly enhances the probability of achieving sufficient inflation by enlarging the favorable phase-space volume.
This paper defends the excursion-set formalism for deriving primordial black hole mass distributions by demonstrating that noise is strictly white when sampling on a synchronous surface and that cloud-in-cloud effects remain crucial for broad power spectra, thereby establishing the necessity of solving the first-passage-time problem with a moving barrier.
This paper presents a global high-resolution hydrological model that dynamically simulates the formation, merging, and redistribution of surface liquid reservoirs on Mars across varying water inventories and evaporation rates, revealing a transition toward a contiguous northern ocean at low water levels and concentrated accumulation in major basins at higher levels.
This study presents the first spatially resolved metallicity analysis of the nearby Seyfert 2 galaxy Mrk 573 at pc scales, revealing patchy oxygen enrichment in AGN-dominated regions that correlates with radio jet emission and suggests metals are transported from the nucleus by AGN-driven outflows rather than star formation.
Two-dimensional particle-in-cell simulations reveal that magnetic reconnection generates strong out-of-plane magnetic fields within flux ropes through distinct mechanisms—specifically the Weibel instability driven by electron temperature anisotropy in the absence of a guide field and separatrix currents reinforced by the Kelvin-Helmholtz instability in its presence—which subsequently scatter electrons and influence heating processes.
This study analyzes six years of cosmic muon rate data from a high-latitude station in Svalbard, revealing that seasonal atmospheric temperature variations drive a pronounced annual modulation and demonstrating the effectiveness of tailored temperature correction techniques compared to lower-latitude measurements.
This paper demonstrates that wave-optics effects induced by cold dark matter subhalos in the mass range of $10^410^7\,M_{\odot}$ produce detectable, percent-level frequency-dependent amplitude and phase distortions in strongly lensed gravitational waves within the LISA band, offering a novel probe of subgalactic dark matter structure inaccessible to electromagnetic observations.
This paper introduces a novel tomographic method to simultaneously reconstruct the bias-weighted mean electron pressure and star formation rate density by jointly modeling the thermal Sunyaev-Zeldovich effect and Cosmic Infrared Background in cross-correlations with galaxy samples, yielding redshift-dependent measurements up to that are largely consistent with FLAMINGO hydrodynamical simulations.
This paper proposes a hierarchical framework and a Fisher-like sensitivity analysis to demonstrate that modeling the redshift evolution of lens mass profiles is essential for avoiding significant biases and achieving precise cosmological constraints from upcoming LSST strong-lensing surveys.
This paper presents an alternative Baryon Acoustic Oscillation (BAO) measurement from the Dark Energy Spectroscopic Instrument's second data release using Legendre multipole representations of Lyman-alpha forest correlations, which achieves 0.96% precision on the isotropic BAO scale at with results consistent with the baseline analysis while offering a positive-definite covariance matrix and reduced nuisance parameter constraints.
This paper presents high-cadence near-infrared spectroscopy of the 2021 eruption of the recurrent nova RS Ophiuchi, characterizing the red giant secondary's pre-eruption state, the high-temperature coronal emission and continuum during the outburst, and potential post-eruption changes in the secondary star.
This paper introduces a novel community detection framework that models solar vortices as an interacting network, revealing that vortices identified as hubs, connectors, or peripherals within these communities exhibit greater persistence, height, and collective helical motion, thereby offering new insights into how collective vortex dynamics drive energy transfer and wave excitation in the upper solar atmosphere.
Despite searching for methanol in the water-rich protoplanetary disk around HL Tau using ALMA archival data, the study found no emission and derived stringent upper limits on its abundance, suggesting that optically thick dust obscures the signal or that the disk's chemical evolution differs significantly from other young stellar objects and comets.
This paper presents an automated framework utilizing the ALeRCE broker to systematically search for optical counterparts to LIGO-Virgo-KAGRA gravitational wave superevents during the O4a and O4b runs, successfully identifying several plausible candidates including a transient consistent with a Bowen fluorescence flare in an AGN.
Using a selection-aware Bayesian framework on JWST JADES data, this study reveals that the black hole-stellar mass relation at high redshift () shares the same slope and normalization as the local Universe but exhibits significantly larger intrinsic scatter, suggesting that the mean scaling was established early while the diversity of growth histories remains high.
This paper presents a new, computer-simulation-based grid of Stark-broadened profiles for 13 neutral helium lines across relevant astrophysical conditions, aiming to correct previous semi-analytical models and improve the determination of physical parameters for helium-rich stars and white dwarfs.
This paper presents a novel method for generating synthetic disk-integrated stellar absorption lines that isolate granulation effects, revealing that while line-shape diagnostics can theoretically trace convective blueshifts, their practical utility is severely limited by photon noise, thereby highlighting the need for more robust metrics and establishing a valuable testbed for high-precision radial velocity studies.
This paper introduces SELDON, a continuous-time variational autoencoder that combines masked GRU-ODE encoders, neural ODE propagators, and interpretable Gaussian-basis decoders to efficiently model sparse, irregular astrophysical light curves and extract physically meaningful parameters for rapid supernova prioritization.