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Relieving the
S
8
S_8
S
8
β
Tension: Exploring the Surface-type DBI Model as a Dark Matter Paradigm
Authors
Xi Kang
Huanyuan Shan
Xingpao Suo
Publication date
11 July 2023
Publisher
View
on
arXiv
Abstract
Recent observations of weak gravitational lensing surveys indicate a smoother Universe compared to the predictions of the Cosmic Microwave Background (CMB). This is known as
Ο
8
\sigma_8
Ο
8
β
tension or
S
8
S_8
S
8
β
tension, where
Ο
8
\sigma_8
Ο
8
β
represents the present root-mean-square matter fluctuation averaged over a sphere of radius
8
h
β
1
M
p
c
8 h^{-1} \mathrm{Mpc}
8
h
β
1
Mpc
and
S
8
β‘
Ο
8
Ξ©
m
/
0.3
S_8 \equiv \sigma_8\sqrt{\Omega_m/0.3}
S
8
β
β‘
Ο
8
β
Ξ©
m
β
/0.3
β
. In this letter, we investigate a kind of general Dirac-Born-Infeld (DBI) Lagrangian referred as surface-type DBI (s-DBI) model. We have found that, up to the linear order, the constraints on the s-DBI model with CMB from Planck2018 and low-redshift probes (WL and GC) yield
S
8
=
0.768
5
β
0.0066
+
0.0077
S_8= 0.7685_{-0.0066}^{+0.0077}
S
8
β
=
0.768
5
β
0.0066
+
0.0077
β
and
S
8
=
0.76
6
β
0.0376
+
0.0471
S_8=0.766_{-0.0376}^{+0.0471}
S
8
β
=
0.76
6
β
0.0376
+
0.0471
β
, respectively, which are not only self-consistent but also consistent with the values derived from most low-redshift probes. Furthermore, we provide an outlook for searching the non-linear effects of this model, which could be helpful to resolve other issues by Cold Dark Matter on small scales.Comment: Submitted, comments welcom
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oai:arXiv.org:2307.04394
Last time updated on 12/07/2023