Results 91 to 100 of about 546,296 (162)

Bulk viscous cosmological models with a cosmological constant: Observational constraints

Astronomy & Astrophysics
Aims. We investigate whether viscous cold dark matter (vCDM) in a Λ-dominated Friedmann-Lemaître-Robertson-Walker (FLRW) universe can alleviate the Hubble tension, while satisfying thermodynamic constraints.
Noemí Villalobos R., Vásquez Yerko, Cruz Norman, López-Caraballo Carlos H.   +3 more
doaj   +1 more source

JWST Observations Reject Unrecognized Crowding of Cepheid Photometry as an Explanation for the Hubble Tension at 8σ Confidence

The Astrophysical Journal Letters
We present high-definition observations with the James Webb Space Telescope (JWST) of >1000 Cepheids in a geometric anchor of the distance ladder, NGC 4258, and in five hosts of eight Type Ia supernovae, a far greater sample than previous studies with ...
Adam G. Riess, Gagandeep S. Anand, Wenlong Yuan, Stefano Casertano, Andrew Dolphin, Lucas M. Macri, Louise Breuval, Dan Scolnic, Marshall Perrin, Richard I. Anderson   +9 more
doaj   +1 more source

The Hubble Tension Interpretation in Terms of Gnomonic Holography

The Hubble tension—the discrepancy between early- and late-Universe measurements of the Hubble constant—remains an open problem in cosmology. This paper proposes a geometric interpretation of the Universe based on gnomonic holography, in which a Hubble ...
Joseph E Mullat
core   +1 more source

The Hubble Tension in Our Own Backyard: DESI and the Nearness of the Coma Cluster

The Astrophysical Journal Letters
The Dark Energy Spectroscopic Instrument (DESI) collaboration measured a tight relation between the Hubble constant ( H _0 ) and the distance to the Coma cluster using the fundamental plane (FP) relation of the deepest, most homogeneous sample of early ...
Daniel Scolnic, Adam G. Riess, Yukei S. Murakami, Erik R. Peterson, Dillon Brout, Maria Acevedo, Bastien Carreres, David O. Jones, Khaled Said, Cullan Howlett, Gagandeep S. Anand   +10 more
doaj   +1 more source

Dynamical Dark Energy and the Unresolved Hubble Tension: Multi-model Constraints from DESI 2025 and Other Probes

The Astrophysical Journal
We present a Bayesian comparative analysis of five cosmological models: ΛCDM, w CDM, w _0 w _a CDM, ϕ CDM (with scalar-field dark energy), and an interacting dark energy scenario (the ξ -index model), to investigate dark energy evolution and the Hubble ...
Zhuoming Zhang, Tengpeng Xu, Yun Chen
doaj   +1 more source

Dynamics of inspiraling dark energy

European Physical Journal C: Particles and Fields
We investigate the dynamics of a multifield dark energy model, which arises from certain rapid-turning and inspiraling trajectories in field space. We find the speed of sound $$c_s$$ c s of the dark energy perturbations around the background and show ...
Lilia Anguelova, John Dumancic, Richard Gass, L. C. R. Wijewardhana   +3 more
doaj   +1 more source

Updated 1.1% Precision Values of the Hubble Constant with Corrected Pantheon+ and DES-DOVEKIE Type Ia Supernovae

The Astrophysical Journal Letters
We update the Hubble constant using corrected Pantheon+ and Dark Energy Survey (DES)-DOVEKIE Type Ia supernovae, presenting the first application of DES-DOVEKIE to a local distance-ladder determination of H _0 .
Shouvik Roy Choudhury
doaj   +1 more source

Cosmic-void observations reconciled with primordial magnetogenesis. [PDF]

Nat Commun, 2023
Hosking DN, Schekochihin AA.
europepmc   +1 more source

A bouncing cosmology from VECROs. [PDF]

Eur Phys J C Part Fields, 2023
Brandenberger R, Mitchell GA.
europepmc   +1 more source

Unitarity problems for an effective field theory description of early universe cosmology. [PDF]

Eur Phys J C Part Fields, 2022
Brandenberger R, Kamali V.
europepmc   +1 more source