SN 2023fyq is the first Type Ibn supernova with a directly detected hot luminous progenitor consistent with a low-mass helium star in a binary system, based on pre-explosion imaging, disappearance confirmation, and multi-wavelength environmental analysis.
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S., Bindi, V., Zhang, M., Feng, X., 2019, A Numerical Study of Cosmic Proton Modulation Using AMS-02 Observations , Astrophys
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A new histogram-free likelihood method applied to simulated JWST observations of brown dwarfs shows that globular cluster ages can be determined with formal errors under 0.2 Gyr.
Coordinated observations of a ~45 g earthgrazing fireball localize thermospheric shock generation to volatile-enhanced hydrodynamic shielding that enables continuum-like flow and detectable infrasound.
In anisotropic neutrino gases, νν-bar pairing instabilities emerge when the excessive pair-occupation number distribution changes sign, producing pair conversions at growth rates comparable to fast flavor instabilities.
Neural network corrects residual errors in isotopologue energy extrapolations for CO2 (MAE reduction in >87% of levels vs Marvel) and transfers patterns to improve CO predictions in >93% of samples.
Dwarf spheroidal galaxies evolve toward a dynamical attractor where r_half ≈ r_max and σ ≈ 0.5 v_max, causing their inferred halo masses to follow narrow sequences based on size.
Bayesian analysis of a smooth hadron-quark crossover EOS finds current observations tightly constrain the density dependence of nuclear symmetry energy while leaving highest-density hadronic and quark-matter parameters only weakly constrained.
Exhaustive symbolic regression on mock weak lensing excess surface density data recovers NFW profiles at 5% fractional errors with as few as 20 clusters but favors simpler functions at higher uncertainties because errors are smallest in the outskirts.
A unified framework for the perturbed Kepler problem derives modified eccentric orbits and gravitational wave imprints from a general perturbed potential, offering a source-specific alternative to post-Newtonian expansions.
Diagnostic EUV–radio temperature disagreement and local conductive-closure failure in the quiet-Sun corona are orthogonal components of one relative entropy of a κ≈2.5 distribution.
MD simulations of 0.1–1 keV radiation cascades in bulk fullerite reveal a unique thermalization phase lasting hundreds of picoseconds, cross-linking of C60 molecules, and a threshold displacement energy of 18 eV.
Monte Carlo and ML surrogate framework projects PTA sensitivity to compact DM substructures and shows SGWB weakens it, with only Shapiro searches retaining sensitivity in optimistic cases.
High-resolution GR neutrino-radiation MHD simulation of 1.35-1.35 Msun BNS merger shows KHI-driven B-field amplification to magnetar levels (~10^50 erg, factor >=316) in 3 ms post-merger.
Multi-wavelength timing analysis of an X-class flare reveals temperature-dependent phase drifting in 5-minute QPPs, interpreted as evidence for periodic magnetic reconnection triggered by lower-atmosphere oscillations.
A semi-supervised VAE trained on Skyrme EOS data reconstructs equations of state with mean absolute percentage errors under 0.14% using two supervised observables (M_max, R_1.4) and one variational latent variable.
skysurvey provides a Python framework with Target, Survey, and DataSet classes plus modeldag to simulate transient sky observations, demonstrated on Type Ia supernovae populations and ZTF DR2 replication.
Rotational averages of the angular correlation function isolate non-statistical isotropy components in the CMB sky as a real-space complement to BipoSH coefficients.
Generalized flux-weighted boundary conditions yield closed-form stationary distributions in collisionless kinetic models that are non-thermal except for the standard Maxwellian case, with analytical moments confirmed by simulations.
Sgr A* exhibits a white-noise-like flat variability regime in its 340 GHz flux on timescales below 2.3 to 6.3 minutes, transitioning to red-noise-like behavior at longer timescales, with no evidence for narrow periodic signals.
Stacking Fermi-LAT data from 21 blazars aligned to their jet directions detects anisotropic extended emission consistent with pair halos produced by a 2.8 x 10^{-16} G intergalactic magnetic field at 3.8 sigma.
A phase-space gating function μ(φ,X) localizes Gauss-Bonnet contributions to a finite e-fold window in inflation while preserving ghost and gradient stability for scalar and tensor modes.
Bulge Fossil Fragments are estimated to generate 15-250 times more binary black hole mergers than typical globular clusters, marking them as a new class of gravitational wave sources.
ASTERIS, a self-supervised spatiotemporal denoising algorithm, improves astronomical detection limits by 1 magnitude at 90% completeness while identifying three times more redshift >9 galaxy candidates in JWST images.
Using a joint effective-spin and precession-spin model on 155 gravitational-wave events, the authors infer that the hierarchical (second-generation) merger fraction rises sharply above ~46 M_sun and peaks again near 15.7 M_sun.
citing papers explorer
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SN 2023fyq: direct detection of a Type Ibn supernova progenitor and its multi-wavelength environmental constraints
SN 2023fyq is the first Type Ibn supernova with a directly detected hot luminous progenitor consistent with a low-mass helium star in a binary system, based on pre-explosion imaging, disappearance confirmation, and multi-wavelength environmental analysis.
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New Way to Date Globular Clusters: Brown Dwarf Cooling Sequences
A new histogram-free likelihood method applied to simulated JWST observations of brown dwarfs shows that globular cluster ages can be determined with formal errors under 0.2 Gyr.
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Shock wave formation in the thermosphere by an earthgrazing fireball: Empirical evidence for volatile-enhanced hydrodynamic shielding
Coordinated observations of a ~45 g earthgrazing fireball localize thermospheric shock generation to volatile-enhanced hydrodynamic shielding that enables continuum-like flow and detectable infrasound.
-
Collective neutrino-antineutrino pair oscillations
In anisotropic neutrino gases, νν-bar pairing instabilities emerge when the excessive pair-occupation number distribution changes sign, producing pair conversions at growth rates comparable to fast flavor instabilities.
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Machine learning isotope shifts in molecular energy levels
Neural network corrects residual errors in isotopologue energy extrapolations for CO2 (MAE reduction in >87% of levels vs Marvel) and transfers patterns to improve CO predictions in >93% of samples.
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A dynamical attractor in the evolution of dwarf spheroidal galaxies
Dwarf spheroidal galaxies evolve toward a dynamical attractor where r_half ≈ r_max and σ ≈ 0.5 v_max, causing their inferred halo masses to follow narrow sequences based on size.
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Bayesian Constraints on the Neutron Star Equation of State with a Smooth Hadron-Quark Crossover
Bayesian analysis of a smooth hadron-quark crossover EOS finds current observations tightly constrain the density dependence of nuclear symmetry energy while leaving highest-density hadronic and quark-matter parameters only weakly constrained.
-
Constraining dark matter halo profiles with symbolic regression
Exhaustive symbolic regression on mock weak lensing excess surface density data recovers NFW profiles at 5% fractional errors with as few as 20 clusters but favors simpler functions at higher uncertainties because errors are smallest in the outskirts.
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Generalized Perturbed Kepler Problem: Gravitational Wave Imprints from Eccentric Compact Binaries
A unified framework for the perturbed Kepler problem derives modified eccentric orbits and gravitational wave imprints from a general perturbed potential, offering a source-specific alternative to post-Newtonian expansions.
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The Diagnostic Disagreement and the Closure Failure of the Quiet-Sun Corona Are the Same Relative Entropy
Diagnostic EUV–radio temperature disagreement and local conductive-closure failure in the quiet-Sun corona are orthogonal components of one relative entropy of a κ≈2.5 distribution.
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Radiation Damage Cascades in Fullerite Using Molecular Dynamics
MD simulations of 0.1–1 keV radiation cascades in bulk fullerite reveal a unique thermalization phase lasting hundreds of picoseconds, cross-linking of C60 molecules, and a threshold displacement energy of 18 eV.
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Projecting the ultimate pulsar timing sensitivity to dark matter substructure in a stochastic gravitational wave background
Monte Carlo and ML surrogate framework projects PTA sensitivity to compact DM substructures and shows SGWB weakens it, with only Shapiro searches retaining sensitivity in optimistic cases.
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A magnetar formation in binary neutron star merger
High-resolution GR neutrino-radiation MHD simulation of 1.35-1.35 Msun BNS merger shows KHI-driven B-field amplification to magnetar levels (~10^50 erg, factor >=316) in 3 ms post-merger.
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Phase-drifting with emitting plasma temperature in the quasi-periodic pulsations of an X-class solar flare
Multi-wavelength timing analysis of an X-class flare reveals temperature-dependent phase drifting in 5-minute QPPs, interpreted as evidence for periodic magnetic reconnection triggered by lower-atmosphere oscillations.
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A Semi-Supervised Variational Autoencoder for Generating Neutron Star Equations of State
A semi-supervised VAE trained on Skyrme EOS data reconstructs equations of state with mean absolute percentage errors under 0.14% using two supervised observables (M_max, R_1.4) and one variational latent variable.
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skysurvey: a pure python package to simulate the transient sky
skysurvey provides a Python framework with Target, Survey, and DataSet classes plus modeldag to simulate transient sky observations, demonstrated on Type Ia supernovae populations and ZTF DR2 replication.
-
Capturing statistical isotropy violation with rotational averages
Rotational averages of the angular correlation function isolate non-statistical isotropy components in the CMB sky as a real-space complement to BipoSH coefficients.
-
Generalized flux-weighted boundary walls in kinetic models
Generalized flux-weighted boundary conditions yield closed-form stationary distributions in collisionless kinetic models that are non-thermal except for the standard Maxwellian case, with analytical moments confirmed by simulations.
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Short timescale variation in the submillimeter flux of Sagittarius A*
Sgr A* exhibits a white-noise-like flat variability regime in its 340 GHz flux on timescales below 2.3 to 6.3 minutes, transitioning to red-noise-like behavior at longer timescales, with no evidence for narrow periodic signals.
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Search for Anisotropic Pair Halos Associated with Blazar Jets
Stacking Fermi-LAT data from 21 blazars aligned to their jet directions detects anisotropic extended emission consistent with pair halos produced by a 2.8 x 10^{-16} G intergalactic magnetic field at 3.8 sigma.
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Beyond $f(\phi)\mathcal{G}$: Gauss--Bonnet inflation with $\mu(\phi,X)$
A phase-space gating function μ(φ,X) localizes Gauss-Bonnet contributions to a finite e-fold window in inflation while preserving ghost and gradient stability for scalar and tensor modes.
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Bulge Fossil Fragments as a new population of factories of gravitational wave sources in the Galaxy
Bulge Fossil Fragments are estimated to generate 15-250 times more binary black hole mergers than typical globular clusters, marking them as a new class of gravitational wave sources.
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Deeper detection limits in astronomical imaging using self-supervised spatiotemporal denoising
ASTERIS, a self-supervised spatiotemporal denoising algorithm, improves astronomical detection limits by 1 magnitude at 90% completeness while identifying three times more redshift >9 galaxy candidates in JWST images.
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Signatures of a subpopulation of hierarchical mergers in the GWTC-4 gravitational-wave dataset
Using a joint effective-spin and precession-spin model on 155 gravitational-wave events, the authors infer that the hierarchical (second-generation) merger fraction rises sharply above ~46 M_sun and peaks again near 15.7 M_sun.
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slicersim: A python package to simulate image slicer spectroscopic observations -- application to the Lazuli Spectrograph
slicersim is a modular Python tool that simulates IFS observations including noise and instrumental effects, demonstrating that the Lazuli Space Observatory could observe 8000 SNe Ia (z=0–1.5) at S/N=25 per resolution element in 1.5 years of on-sky time.
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The local galaxy distribution does not violate the cosmological principle
The gigaparsec-scale anisotropy claimed in DESI DR1 disappears once luminosity distances are not mistaken for comoving distances and galaxy mocks include bias and redshift-space distortions.
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Characterizing robotic positioners under the influence of changing gravity vectors for future spectroscopic surveys
An automated telescope simulator test stand is built and initially tested to characterize robotic fiber positioners for stability under varying gravity vectors, targeting 1 μm position, 5 μm focus, and 0.4° tilt performance.
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Polarization Angle Geodesics in PSRs B1133+16 and B2016+28
Reanalysis of pulsar data shows polarization angles in PSRs B1133+16 and B2016+28 follow great-circle geodesics on the Poincare sphere due to mode transitions.
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On the Limits of Performance Portability in Directive-Based GPU Programming
OpenMP port of gPLUTO achieves comparable performance to OpenACC on NVIDIA but is 3x slower at application level and up to 10x at kernel level on AMD MI250X, driven by strided memory accesses, latency bounds, and C++ abstraction overheads.
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Signs of Sulphur fractionation under high magnetic field strength
Sulphur abundances decrease above 150 G in coronal loops, indicating FIP fractionation is modulated by mean magnetic field strength.
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Detector for fast wave trains in the solar radio emission
A neural network detector applied to 2011 solar radio spectra identified 50 QFP wave train candidates, with 13 associated with global coronal EUV waves.
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Nuclear Constraints on $^{12}$C$(\alpha,\gamma)^{16}$O and Their Impact on Black-Hole Mass Predictions
Updated ANC constraints on the 12C(alpha,gamma)16O S-factor favor lower values than prior evaluations and imply a black-hole mass-gap lower edge of 61-75 solar masses.
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From Scalar $H_0$ to $E(z)$: A Reformulation of the Hubble Tension
Re-expressing the Hubble tension via posterior-implied E(z) histories yields moderate mismatches (S_hist of 1.65 and 2.55) that correspond to only 1.1-2.1 sigma equivalents, below the usual 4.9 sigma scalar-H0 discrepancy.
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Nonlinear steepening of a fast magnetoacoustic wave in the vicinity of a coronal magnetic null point
Fast magnetoacoustic waves steepen and dissipate nonlinearly before reaching coronal magnetic null points due to decreasing fast speed in the non-uniform magnetic field.
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The Significant Role of Hydrogen in the Formation of Silicon Carbide in Evolved Stars
Experiments reveal that hydrogen plays a central role in forming SiC2, the key precursor to silicon carbide nanodust in carbon-rich stars.
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Chaotic dynamics of charged particles near weakly magnetized black holes in Einstein-ModMax Theory
Numerical simulations show Shannon entropy and MIPP indicators distinguish chaotic from regular orbits of charged particles near weakly magnetized black holes in Einstein-ModMax theory, with parameters restricted by EHT shadow observations.
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Gravitational emissions and light curves of quasi-periodic orbits in Schwarzschild spacetime embedded in a Dehnen-type dark matter halo
Dehnen-halo parameters amplify closed-orbit scale and induce GW phase lag; for the (z,1,z-1) family, light-curve peaks equal 3z-1 at high inclination.
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Terrestrial planet formation in the era of GPU computing
GPU-accelerated N-body simulations show that the common acceleration factor f distorts planetary chemical compositions and that terrestrial planets can form resonant chains without gas-driven orbital migration.
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Experimental predictions of the $E_8 \times \omega E_8$ octonionic unification program : A falsification-oriented catalogue for quantum foundations, particle physics, gravitation, and cosmology
An E8×ωE8 octonionic program yields a catalogue of empirical claims, including neutrino mass values, CKM elements, coupling ratios, and gravitational parity tests, framed as failure modes.
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Optical Appearance and Ringdown of Black Holes in a Kalb Ramond Field Coupled to Perfect Fluid Dark Matter
A black hole in a Kalb-Ramond field coupled to perfect fluid dark matter has modified photon orbits and quasinormal mode frequencies and damping rates that depend on the Lorentz-violating parameter alpha and dark matter parameter lambda.
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Recoil kicks from binary black hole mergers in GWTC catalogs: implications for retention and hierarchical mergers
GWTC BBH mergers have typical recoil kicks of ~300–330 km/s, with retention of only ~2–3% in globular clusters; hierarchical-merger prospects depend on both retention and post-kick re-centering.
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Symbolic Emulators for Cosmology: Accelerating Cosmological Analyses Without Sacrificing Precision
Symbolic emulators approximate key Lambda CDM functions to 0.001-0.05% accuracy across relevant redshifts and Omega_m values, enabling faster 3x2pt inference with consistent results.
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Biased parameter inference of eccentric, spin-precessing binary black holes
Eccentric BBH signals recovered with quasi-circular precessing models show biases in chirp mass and χ_p; Bayes factors favor eccentric aligned-spin models when both eccentricity and precession are present.
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Does DESI prefer Damped Oscillating Dark Energy over Cosmological constant?
Underdamped dark-energy oscillator fits to DESI+DESY5/Union3 give H0≈71–72 km/s/Mpc, cutting SH0ES tension to ~1.5σ at no Bayesian cost versus ΛCDM.
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Combining gravitational wave search pipelines to find subthreshold signals in GWTC-5.0
Multi-pipeline machine learning with conformal prediction up-ranks subthreshold LIGO/Virgo candidates, including GW200311_103121, as signal-like.
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GRMHD and GRRT Simulations of Black Hole Accretion: Flares, Precession, and Complex Spacetimes
Simulations of accreting black holes in standard and complex spacetimes indicate that magnetic geometry, quantum corrections, and binary dynamics influence flares, precession, photon rings, and multi-wavelength variability, with potential EHT constraints.
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Evidence for additional structure in the effective spin distribution hints at multiple formation pathways in GWTC-5.0
GWTC-5.0 analysis finds evidence for structure beyond a non-skewed Gaussian bulk in χ_eff, with suggestive mass-dependent excess of positive over negative spins outside the bulk at 13:1 odds in one mass bin.
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Inflationary interpretation of the gravitational-wave signal in the European Pulsar Timing Array DR2 with constraints
Constrains inflationary tensor parameters to fit the EPTA DR2 signal under CMB, BBN and LVK bounds, favoring radiation-era horizon re-entry but requiring low reheating temperatures.
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Impact of the equation of state on core collapse supernovae I: the low-$T/|W|$ instability
Simulations show the low-T/|W| instability develops robustly across five nuclear EOS in a rapidly rotating 35 M⊙ progenitor, with dominant GW frequency correlating to PNS compactness and stiffness.
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Bar-driven gas redistribution suppresses star formation in spiral galaxies: Evidence from dust lanes in NGC 3351
Multi-wavelength observations of NGC 3351 provide evidence that the stellar bar redistributes molecular gas inward, depleting it along the bar and suppressing star formation while building a central reservoir.