Tag: #cosmology

Reanalysis with Corrected Pantheon+ and DES-DOVEKIE Leaves Hubble Tension Intact

A reanalysis applying corrected Pantheon+ and DES-DOVEKIE supernova data finds the local Hubble constant stays near 73 km/s/Mpc, leaving the Hubble tension unchanged.

#hubbletension, #cosmology, #supernovae, #pantheonplus, #des

Study of eROSITA clusters gives first constraints on Early Dark Energy; joint fit suggests H0 ≈ 71 km/s/Mpc

eROSITA cluster counts yield first cluster-based constraints on Early Dark Energy; combined with CMB and BAO the fit finds f_EDE≈0.10 and H0≈71.4±1.4 km/s/Mpc.

#astronomy, #cosmology, #erosita, #hubbletension

SPT-3G produces high-precision CMB lensing map, sharpens neutrino-mass and structure-growth limits

SPT-3G releases a high signal-to-noise CMB lensing map from 2019–20 South Pole data, tightening structure-growth and neutrino-mass constraints.

#cmb, #cosmology, #spt3g, #neutrinos

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

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