Cosmological constraints on <math display="inline"><msub><mi mathvariant="normal">Λ</mi><mi mathvariant="normal">s</mi></msub><mi>CDM</mi></math> scenario in a type II minimally modified gravity - INSPIRE

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Cosmological constraints on $Λ_{s} CDM$ scenario in a type II minimally modified gravity

Özgür Akarsu
(
- Istanbul, Tech. U.
)
,
Antonio De Felice
(
- Kyoto U., Yukawa Inst., Kyoto
)
,
Eleonora Di Valentino
(
- Sheffield U.
)
,
Suresh Kumar
(
- IISER, Mohali
)
,
Rafael C. Nunes
(
- Rio Grande do Sul U. and
- Sao Jose, INPE
)

Jun 11, 2024

17 pages

Published in:

Phys.Rev.D 110 (2024) 10, 103527

Published: Nov 15, 2024

e-Print:

2406.07526 [astro-ph.CO]

DOI:

10.1103/PhysRevD.110.103527 (publication)

Report number:

YITP-24-57

View in:

ADS Abstract Service

reference search27 citations

Citations per year

Abstract: (APS)

The idea of a rapid sign-switching cosmological constant (mirror AdS-dS transition) in the late universe at

z \sim 1.7

, known as the

Λ_{s} CDM

model, has significantly improved the fit to observational data and provides a promising scenario for alleviating major cosmological tensions, such as the

H_{0}

and

S_{8}

tensions. However, in the absence of a fully predictive model, implementing this fit required conjecturing that the dynamics of the linear perturbations are governed by general relativity. Recent work embedding the

Λ_{s} CDM

model with the Lagrangian of a type II minimally modified gravity known as VCDM has propelled

Λ_{s} CDM

to a fully predictive model, removing the uncertainty related to the aforementioned assumption; we call this new model

Λ_{s} VCDM

. In this work, we demonstrate that not only does

Λ_{s} CDM

fit the data better than the standard

Λ CDM

model, but the new model,

Λ_{s} VCDM

, performs even better in alleviating cosmological tensions while also providing a better fit to the data, including cosmic microwave background, baryon acoustic oscillations, type Ia supernovae, and cosmic shear measurements. Our findings highlight the

Λ_{s} CDM

framework, particularly the

Λ_{s} VCDM

model, as a compelling alternative to the standard

Λ CDM

model, especially by successfully alleviating the

H_{0}

tension. Additionally, these models predict higher values for

σ_{8}

, indicating enhanced structuring, albeit with lower present-day matter density parameter values and consequently reduced

S_{8}

values, alleviating the

S_{8}

tension as well. This demonstrates that the data are well fit by a combination of background and linear perturbations, both having dynamics differing from those of

Λ CDM

. This paves the way for further exploration of new ways for embedding the sign-switching cosmological constant into other models.

Note:

17 pages, 6 figures, 2 tables; matches the version published in Physical Review D

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