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PreprintCC BY 4.0arXiv

ΛCDM in a courtroom

  • Ofer Lahav
  • Paul Shah
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Abstract

The cosmological constant Λ, and its generalization as Dark Energy, makes up roughly 70% of the present-epoch universe and has been part of the dominant ΛCDM cosmological paradigm for more than a quarter of a century. It has been put on trial by recent measurements of galaxy clustering, Type Ia supernovae, and the cosmic microwave background. In this Perspective we evaluate the strength of the evidence for a constant Λ, versus Dynamical Dark Energy (DDE) in the light of recent developments. We also assess what the future holds both for our Universe and our understanding of its most mysterious component.

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Cite

BibTeXRIS
BibTeX
@misc{lahav2026λcdm,
  title = {{$Λ$CDM in a courtroom}},
  author = {Ofer Lahav and Paul Shah},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.16097},
  eprint = {2609.16097},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.16097},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - ΛCDM in a courtroom
AU  - Ofer Lahav
AU  - Paul Shah
PY  - 2026
DA  - 2026/09/14
PB  - arXiv
DO  - 10.48550/arxiv.2609.16097
UR  - https://arxiv.org/abs/2609.16097
AB  - The cosmological constant Λ, and its generalization as Dark Energy, makes up roughly 70% of the present-epoch universe and has been part of the dominant ΛCDM cosmological paradigm for more than a quarter of a century. It has been put on trial by recent measurements of galaxy clustering, Type Ia supernovae, and the cosmic microwave background. In this Perspective we evaluate the strength of the evidence for a constant Λ, versus Dynamical Dark Energy (DDE) in the light of recent developments. We also assess what the future holds both for our Universe and our understanding of its most mysterious component.
ER  -