Tag: #cosmology

Preprint: FRB–Planck analysis suggests about half of the missing baryons sit in warm-hot intergalactic gas

A new preprint finds a CHIME FRB–Planck cross-correlation implying roughly half of ordinary baryons may lie in the warm-hot intergalactic medium; result awaits review.

#astronomy, #frb, #cosmology, #whim

Joint ACT–Planck analysis strengthens hint of cosmic birefringence but systematics remain

Joint ACT–Planck analysis finds a 0.277° cosmic-birefringence hint at 4.8σ, but calibration and dust systematics mean a firm detection remains out of reach.

#cosmicbirefringence, #cosmology, #cmb, #planck, #act

Reanalysis Challenges DESI’s Claimed Signal for Dynamical Dark Energy

A new arXiv reanalysis finds DESI’s apparent hint of evolving dark energy is concentrated in one redshift bin and vanishes under alternate statistical checks.

#darkenergy, #desi, #cosmology, #arxiv

DESI preprint reports 1% measurement of the universe’s expansion at redshift 2.33

DESI's new preprint reports a 1% measurement of cosmic expansion geometry at z=2.33 from the Lyman‑alpha forest, tightening high‑redshift anchors for H0 and Ωm.

#cosmology, #desi, #lymanalpha, #darkenergy

Updated Pantheon+ and DES Supernova Data Leave Local Hubble Constant Near 73, Study Finds

An arXiv preprint finds corrected Pantheon+ and DES-DOVEKIE supernova data keep the local Hubble constant near 73 km/s/Mpc, leaving the Hubble tension intact.

#hubble-tension, #cosmology, #supernovae, #astronomy

Revised DESI reanalysis suggests unusually tight cosmological bounds on neutrino mass, favors normal ordering

A revised DESI reanalysis reports unusually tight cosmological limits on the sum of neutrino masses that favor the normal ordering, but the result is preliminary.

#neutrinos, #cosmology, #desi, #particlephysics

Preprint Suggests Dark Matter–Dark Energy Interaction Could Explain DESI Anomalies

A revised arXiv preprint argues DESI-era tensions with ΛCDM may be explained by dark matter–dark energy interactions rather than evolving dark energy.

#cosmology, #darkenergy, #darkmatter, #desi

ArXiv preprint claims axion early dark energy model raises Hubble constant to 71.6, easing Hubble tension

Unreviewed arXiv preprint reports an axion early dark energy fit to CMB, DESI and JWST data gives H0 = 71.58 ± 1.05 km/s/Mpc, largely easing the Hubble tension.

#cosmology, #hubble-tension, #early-dark-energy, #arxiv

Possible detection of cold molecular gas in REBELS-25, 700 million years after the Big Bang

Astronomers report a possible low-J CO detection in galaxy REBELS-25 at z=7.31, implying a huge cold molecular gas reservoir 700 million years after the Big Bang.

#astronomy, #galaxies, #cosmology, #moleculargas

Webb Measures Massive Black Hole in Tiny Galaxy 700 Million Years After Big Bang

Webb's NIRSpec mapped gas in a z=7.04 'Little Red Dot', finding a 10^7–10^8 solar-mass black hole that may outweigh its primitive host.

#astronomy, #blackhole, #jameswebb, #cosmology, #earlyuniverse

LIGO-Virgo-KAGRA releases GWTC-5.0, expanding gravitational-wave catalog to 390 events

LVK's GWTC-5.0 adds 150 compact-binary candidates from O4b, raising the catalog to 390 events and improving population studies, Hubble estimates and GR tests.

#gravitational-waves, #ligo, #astronomy, #cosmology

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

Wide JWST Survey Finds Fewer Galaxies at z≈10, Bringing Counts Closer to Spectroscopy

A 36-sightline JWST NIRCam survey reports lower galaxy counts near redshift 10 than earlier photometric studies, aligning better with spectroscopic results.

#jwst, #astronomy, #galaxies, #cosmology

DESI completes five-year survey; will continue through 2028 to probe dark energy

The Dark Energy Spectroscopic Instrument finished its original five‑year survey, mapping 47M+ objects. DESI will continue through 2028 to test whether dark energy evolves.

#astronomy, #darkenergy, #cosmology, #desi