More out of less: an excess integrated Sachs-Wolfe signal from supervoids mapped out by the Dark Energy Survey

Abstract

The largest structures in the cosmic web probe the dynamical nature of dark energy through their integrated Sachs-Wolfe imprints. In the strength of the signal, typical cosmic voids have shown good consistency with expectation $A_{\mathrm{ISW}}=\Delta T^{\mathrm{data}}/\Delta T^{\mathrm{theory}}=1$, given the substantial cosmic variance. Discordantly, large-scale hills in the gravitational potential, or supervoids, have shown excess signals. In this study, we mapped out 87 new supervoids in the total 5000 deg${}^2$ footprint of the Dark Energy Survey at $0.2<z<0.9$ to probe these anomalous claims. We found an excess imprinted profile with $A_{\mathrm{ISW}}\approx 4.1\pm 2.0$ amplitude. The combination with independent BOSS data reveals an ISW imprint of supervoids at the $3.3\sigma$ significance level with an enhanced $A_{\mathrm{ISW}}\approx 5.2\pm 1.6$ amplitude. The tension with $\Lambda$CDM predictions is equivalent to $2.6\sigma$ and remains unexplained.

arXiv comment13 pages, 5 figures, accepted MNRAS (minor revision)

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