Everyone wants something better than ΛCDM

2025/10/07 by Turner, Michael S.
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2510.05483

Abstract

The current cosmological paradigm, ΛCDM, is characterized its expansive description of the history of the Universe, its deep connections to particle physics and the large amounts of data that support it. Nonetheless, ΛCDM's critics argue that it has been falsified or must be discarded for various reasons. Critics and boosters alike do agree on one thing: it is the not the final cosmological theory and they are anxious to see it replaced by something better! I review the status of ΛCDM, provide my views of the path forward, and discuss the role that the ``Hubble tension'' might play.

Citations

• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• Evidence of Dark Energy Prior to its Discovery
• JWST Lensed quasar dark matter survey II: Strongest gravitational lensing limit on the dark matter free streaming length to date
• DESI 2024 VI: cosmological constraints from the measurements of baryon acoustic oscillations
• Union Through UNITY: Cosmology with 2,000 SNe Using a Unified Bayesian Framework
• The many tensions with dark-matter based models and implications on the nature of the Universe
• The Hubble Tension and Early Dark Energy
• The Pantheon+ Analysis: Cosmological Constraints
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km s⁻¹ Mpc⁻¹ Uncertainty from the Hubble Space Telescope and the SH0ES Team
• Improved Constraints on Primordial Gravitational Waves using <i>Planck</i>, WMAP, and BICEP/<i>Keck</i> Observations through the 2018 Observing Season
• ΛCDM: Much more than we expected, but now less than what we want
• Small-Scale Challenges to the <b><i>Λ</i></b>CDM Paradigm
• Dark Energy and the Accelerating Universe
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• A modification of the Newtonian dynamics as a possible alternative to the hidden mass hypothesis
• A new inflationary universe scenario: A possible solution of the horizon, flatness, homogeneity, isotropy and primordial monopole problems

Cited by

• Overview of the ESCAPE Dark Matter Test Science Project for Astronomers

Related

• ΛCDM: The path forward
• ΛCDM: Much more than we expected, but now less than what we want
• Is it time to go beyond ΛCDM universe?
• The Case for LambdaCDM
• ΛCDM cosmology: how much suppression of credible evidence, and does the model really lead its competitors, using all evidence?