On the halo-mass and radial scale dependence of the lensing is low effect
The canonical \(\Lambda\)CDM cosmological model makes precise predictions for the clustering and lensing properties of galaxies. It has been shown that the lensing amplitude of galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS) is lower than expected given their clustering properties. We...
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Abstract | The canonical \(\Lambda\)CDM cosmological model makes precise predictions for the clustering and lensing properties of galaxies. It has been shown that the lensing amplitude of galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS) is lower than expected given their clustering properties. We present new measurements and modelling of galaxies in the BOSS LOWZ sample. We focus on the radial and stellar mass dependence of the lensing amplitude mis-match. We find an amplitude mis-match of around \(35\%\) when assuming \(\Lambda\)CDM with Planck Cosmological Microwave Background (CMB) constraints. This offset is independent of halo mass and radial scale in the range \(M_{\rm halo}\sim 10^{13.3} - 10^{13.9} h^{-1} M_\odot\) and \(r=0.1 - 60 \, h^{-1} \mathrm{Mpc}\) (\(k \approx 0.05 - 20 \, h \, {\rm Mpc}^{-1}\)). The observation that the offset is both mass and scale independent places important constraints on the degree to which astrophysical processes (baryonic effects, assembly bias) can fully explain the effect. This scale independence also suggests that the "lensing is low" effect on small and large radial scales probably have the same physical origin. Resolutions based on new physics require a nearly uniform suppression, relative to \(\Lambda\)CDM predictions, of the amplitude of matter fluctuations on these scales. The possible causes of this are tightly constrained by measurements of the CMB and of the low-redshift expansion history. |
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AbstractList | The canonical $\Lambda$CDM cosmological model makes precise predictions for
the clustering and lensing properties of galaxies. It has been shown that the
lensing amplitude of galaxies in the Baryon Oscillation Spectroscopic Survey
(BOSS) is lower than expected given their clustering properties. We present new
measurements and modelling of galaxies in the BOSS LOWZ sample. We focus on the
radial and stellar mass dependence of the lensing amplitude mis-match. We find
an amplitude mis-match of around $35\%$ when assuming $\Lambda$CDM with Planck
Cosmological Microwave Background (CMB) constraints. This offset is independent
of halo mass and radial scale in the range $M_{\rm halo}\sim 10^{13.3} -
10^{13.9} h^{-1} M_\odot$ and $r=0.1 - 60 \, h^{-1} \mathrm{Mpc}$ ($k \approx
0.05 - 20 \, h \, {\rm Mpc}^{-1}$). The observation that the offset is both
mass and scale independent places important constraints on the degree to which
astrophysical processes (baryonic effects, assembly bias) can fully explain the
effect. This scale independence also suggests that the "lensing is low" effect
on small and large radial scales probably have the same physical origin.
Resolutions based on new physics require a nearly uniform suppression, relative
to $\Lambda$CDM predictions, of the amplitude of matter fluctuations on these
scales. The possible causes of this are tightly constrained by measurements of
the CMB and of the low-redshift expansion history. The canonical \(\Lambda\)CDM cosmological model makes precise predictions for the clustering and lensing properties of galaxies. It has been shown that the lensing amplitude of galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS) is lower than expected given their clustering properties. We present new measurements and modelling of galaxies in the BOSS LOWZ sample. We focus on the radial and stellar mass dependence of the lensing amplitude mis-match. We find an amplitude mis-match of around \(35\%\) when assuming \(\Lambda\)CDM with Planck Cosmological Microwave Background (CMB) constraints. This offset is independent of halo mass and radial scale in the range \(M_{\rm halo}\sim 10^{13.3} - 10^{13.9} h^{-1} M_\odot\) and \(r=0.1 - 60 \, h^{-1} \mathrm{Mpc}\) (\(k \approx 0.05 - 20 \, h \, {\rm Mpc}^{-1}\)). The observation that the offset is both mass and scale independent places important constraints on the degree to which astrophysical processes (baryonic effects, assembly bias) can fully explain the effect. This scale independence also suggests that the "lensing is low" effect on small and large radial scales probably have the same physical origin. Resolutions based on new physics require a nearly uniform suppression, relative to \(\Lambda\)CDM predictions, of the amplitude of matter fluctuations on these scales. The possible causes of this are tightly constrained by measurements of the CMB and of the low-redshift expansion history. |
Author | Zhou, Rongpu Smith, Tristan L Francis-Yan Cyr-Racine Guo, Hong Singh, Sukhdeep Lange, Johannes U Leauthaud, Alexie |
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BackLink | https://doi.org/10.48550/arXiv.2011.02377$$DView paper in arXiv https://doi.org/10.1093/mnras/stab189$$DView published paper (Access to full text may be restricted) |
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Snippet | The canonical \(\Lambda\)CDM cosmological model makes precise predictions for the clustering and lensing properties of galaxies. It has been shown that the... The canonical $\Lambda$CDM cosmological model makes precise predictions for the clustering and lensing properties of galaxies. It has been shown that the... |
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SubjectTerms | Amplitudes Astronomical models Baryons Clustering Constraints Cosmic microwave background Cosmology Dependence Galaxies Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Red shift Sky surveys (astronomy) Stellar mass |
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Title | On the halo-mass and radial scale dependence of the lensing is low effect |
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