Tag: #astrophysics

DESI DR1 Reanalysis Sets Neutrino Mass Limit That Appears to Disfavor Inverted Ordering

Independent reanalysis of DESI DR1 finds a 95% cosmological upper limit on summed neutrino mass that appears to disfavor the inverted hierarchy.

#neutrinos, #cosmology, #desi, #astrophysics

Preprint reports >3σ evidence for w = −1 ‘phantom crossing’ in CPL dark‑energy fits

A UT Dallas preprint using an “optimal redshift” method finds CPL-model fits to current data show w = −1 crossing at >3σ for several dataset combinations.

#cosmology, #darkenergy, #astrophysics, #desi

Study: JUNO Could Detect Solar MSW Transition at >4σ Within 10 Years If Neutron-Tagging Works

Peer-reviewed study projects China’s JUNO detector could reach >4σ sensitivity to the solar MSW transition within 10 years if backgrounds are cut by neutron tagging.

#neutrinos, #juno, #msw, #astrophysics

X-ray Polarization from Magnetar 1E 1547.0−5408 Supports Long-Predicted Vacuum Birefringence

Nature study finds unusually strong, phase-resolved X-ray polarization from magnetar 1E 1547.0−5408, evidence consistent with QED vacuum birefringence.

#magnetars, #x-ray, #vacuumbirefringence, #astrophysics

H.E.S.S. detects no gamma-ray line from Galactic Centre, but reaches thermal Higgsino benchmark

H.E.S.S.'s deepest search found no gamma-ray line from the Galactic Centre but sets the strongest limits yet, probing thermal Higgsino models.

#darkmatter, #astronomy, #gamma-rays, #astrophysics

IceCube arXiv preprint reports 5.7σ detection of high-energy neutrinos from Milky Way

An IceCube arXiv preprint reports a 5.7σ detection of high-energy neutrinos from the Milky Way's Galactic plane, centered on the inner Galaxy.

#neutrinos, #astrophysics, #icecube, #milkyway

Analysis of 168 Gravitational-Wave Events Finds No Break in Einstein’s General Relativity

A LIGO-Virgo-KAGRA analysis of 168 high-confidence mergers finds no deviations from general relativity, tightening previous constraints.

#gravitational-waves, #general-relativity, #ligo, #astrophysics

UCL Reanalysis Confirms 20 GeV Gamma‑Ray Halo Around Milky Way, but Stops Short of Dark‑Matter Claim

UCL reanalysis finds a persistent 20 GeV gamma‑ray halo in Fermi-LAT data around the Milky Way but cautions it's consistent with—not proof of—dark matter.

#astronomy, #darkmatter, #fermilat, #astrophysics

Claim of 1.7-Second Periodicity in Repeating FRB 20201124A Sparks Debate

A revised arXiv preprint reports a ~1.7-second period in repeating FRB 20201124A suggesting a spinning magnetar; independent reanalysis disputes the claim.

#frb, #magnetar, #astronomy, #astrophysics

GWTC-5.0 population study finds structured black-hole masses and a rapidly spinning subpopulation

Analysis of 267 compact-binary mergers (GWTC-5.0) reveals peaks in black-hole masses and a rapidly spinning subpopulation consistent with hierarchical mergers.

#gravitational-wave, #black-holes, #ligo, #astrophysics

Preprint Claims ~100 TeV Neutrinos From Milky Way’s Fermi Bubbles; Confirmation Pending

An arXiv preprint reports a >3σ correlation of ~100 TeV neutrinos with the Milky Way’s Fermi bubbles in public IceCube data; independent confirmation is needed.

#neutrinos, #astrophysics, #icecube, #fermi-bubbles

Preprint claims first detection of 'moving lens' effect in CMB at 4.8σ

An arXiv preprint reports a 4.8σ detection of the 'moving lens' effect in the CMB using ACT and DESI, a claimed new probe of transverse cosmic velocities.

#cosmology, #cmb, #act, #desi, #astrophysics

Preprint: CHIME Fast Radio Bursts Trace Diffuse Baryons Across the Cosmic Web

A new preprint uses dispersion from 3,455 CHIME fast radio bursts to statistically link FRB sightlines with maps of hot gas and galaxies, probing diffuse baryons.

#frb, #astrophysics, #cosmology, #chime, #baryons

Preprint suggests two supernova remnants may accelerate cosmic rays to PeV energies

A LHAASO preprint reports gamma rays up to hundreds of TeV from two supernova remnants, which authors interpret as evidence they accelerated hadronic cosmic rays to PeV energies.

#cosmicrays, #lhaaso, #supernova, #gammarays, #astrophysics

Study: Cygnus X-3 Emits Petaelectronvolt Gamma Rays, Hinting at Galactic 'PeVatron'

LHAASO reports variable gamma rays up to petaelectronvolt energies from Cygnus X-3, suggesting the microquasar may be a Galactic PeVatron.

#astrophysics, #gammarays, #cosmicrays, #lhaaso, #cygnusx3