Dark Scattering: accelerated constraints from KiDS-1000 with ReACT and CosmoPower
arxiv(2024)
摘要
We present constraints on the Dark Scattering model through cosmic shear
measurements from the Kilo Degree Survey (KiDS-1000), using an accelerated
pipeline with novel emulators produced with CosmoPower. Our main
emulator, for the Dark Scattering non-linear matter power spectrum, is trained
on predictions from the halo model reaction framework, previously validated
against simulations. Additionally, we include the effects of baryonic feedback
from HMcode2016, whose contribution is also emulated. We analyse the
complete set of statistics of KiDS-1000, namely Band Powers, COSEBIs and
Correlation Functions, for Dark Scattering in two distinct cases. In the first
case, taking into account only KiDS cosmic shear data, we constrain the
amplitude of the dark energy - dark matter interaction to be | A_ ds|≲ 20 b/GeV at 68% C.L. Furthermore, we add information
from the cosmic microwave background (CMB) from Planck, along with baryon
acoustic oscillations (BAO) from 6dFGS, SDSS and BOSS, approximating a combined
weak lensing + CMB + BAO analysis. From this combination, we constrain A_
ds = 10.6^+4.5_-7.3 b/GeV at 68% C.L. We confirm that with this
estimated value of A_ ds the interacting model considered in this work
offers a promising alternative to solve the S_8 tension.
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