Weak lensing by voids in modified lensing potentials

Barreira, Alexandre; Cautun, Marius; Li, Baojiu; Baugh, C. M.; Pascoli, Silvia

doi:10.1088/1475-7516/2015/08/028

Cited by 109 publications

(138 citation statements)

References 138 publications

(300 reference statements)

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“…those with the chameleon screening mechanism, voids are expected to be emptier than their GR counterparts. The dark matter profile of voids can therefore provide powerful test for modified gravity (Clampitt, Cai & Li 2013;Barreira et al 2015;Cai, Padilla & Li 2015;Lam et al 2015). Our measurement suggests that it is possible to do this with CMB lensing.…”

Section: S U M M a Ry A N D C O N C L U S I O N Smentioning

confidence: 74%

The lensing and temperature imprints of voids on the cosmic microwave background

Cai

Neyrinck

Mao

et al. 2016

Mon. Not. R. Astron. Soc.

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We have searched for the signature of cosmic voids in the CMB, in both the Planck temperature and lensing-convergence maps; voids should give decrements in both. We use ZOBOV voids from the DR12 SDSS CMASS galaxy sample. We base our analysis on N -body simulations, to avoid a posteriori bias. For the first time, we detect the signature of voids in CMB lensing: the significance is 3.2σ, close to ΛCDM in both amplitude and projected densityprofile shape. A temperature dip is also seen, at modest significance (2.3σ), with amplitude about 6 times the prediction. This temperature signal is induced mostly by voids with radius between 100 and 150 h −1 Mpc, while the lensing signal is mostly contributed by smaller voids -as expected; lensing relates directly to density, while ISW depends on gravitational potential. The void abundance in observations and simulations agree, as well. We also repeated the analysis excluding lower-significance voids: no lensing signal is detected, with an upper limit of about twice the ΛCDM prediction. But the mean temperature decrement now becomes non-zero at the 3.7σ level (similar to that found by Granett et al.), with amplitude about 20 times the prediction. However, the observed dependence of temperature on void size is in poor agreement with simulations, whereas the lensing results are consistent with ΛCDM theory. Thus, the overall tension between theory and observations does not favour non-standard theories of gravity, despite the hints of an enhanced amplitude for the ISW effect from voids.

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Section: S U M M a Ry A N D C O N C L U S I O N Smentioning

confidence: 74%

The lensing and temperature imprints of voids on the cosmic microwave background

Cai

Neyrinck

Mao

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Barreira et al (2015) have shown Galileon models have a large effect on void lensing predictions. It would be interesting to test whether such theories also give significantly different results for void bias.…”

Section: Discussionmentioning

confidence: 99%

Clustering and bias measurements of SDSS voids

Clampitt

Jain

Sánchez

2016

Mon. Not. R. Astron. Soc.

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Using a void catalog from the SDSS survey, we present the first measurements of void clustering and the corresponding void bias. Over the range 30 − 200 Mpc/h the void auto-correlation is detected at 5σ significance for voids of radius 15 − 20 Mpc/h. We also measure the void-galaxy cross-correlation at higher signal-to-noise and compare the inferred void bias with the autocorrelation results. Void bias is constant with scale for voids of a given size, but its value falls from 5.6 ± 1.0 to below zero as the void radius increases from 15 to 30 Mpc/h. The comparison of our measurements with carefully matched galaxy mock catalogs, with no free parameters related to the voids, shows that model predictions can be reliably made for void correlations. We study the dependence of void bias on tracer density and void size with a view to future applications. In combination with our previous lensing measurements of void mass profiles, these clustering measurements provide another step towards using voids as cosmological tracers.

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“…(6) the "RR" model. Further work on the RR and RT models has been presented in [51][52][53][54][55][56][57][58][59].…”

Section: An Overview Of Nonlocal Modelsmentioning

confidence: 99%

Conformal symmetry and nonlinear extensions of nonlocal gravity

Cusin¹,

Foffa²,

Maggiore³

et al. 2016

Phys. Rev. D

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We study two nonlinear extensions of the nonlocal R□ −2 R gravity theory. We extend this theory in two different ways suggested by conformal symmetry, either replacing □ −2 with ð−□ þ R=6Þ −2 , which is the operator that enters the action for a conformally-coupled scalar field, or replacing □ −2 with the inverse of the Paneitz operator, which is a four-derivative operator that enters in the effective action induced by the conformal anomaly. We show that the former modification gives an interesting and viable cosmological model, with a dark energy equation of state today w DE ≃ −1.01, which very closely mimics ΛCDM and evolves asymptotically into a de Sitter solution. The model based on the Paneitz operator seems instead excluded by the comparison with observations. We also review some issues about the causality of nonlocal theories, and we point out that these nonlocal models can be modified so to nicely interpolate between Starobinski inflation in the primordial universe and accelerated expansion in the recent epoch.

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Weak lensing by voids in modified lensing potentials

Cited by 109 publications

References 138 publications

The lensing and temperature imprints of voids on the cosmic microwave background

The lensing and temperature imprints of voids on the cosmic microwave background

Clustering and bias measurements of SDSS voids

Conformal symmetry and nonlinear extensions of nonlocal gravity

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