文章基本信息

标题：Cosmic voids in modified gravity scenarios
本地全文：下载
作者：Eder L. D. Perico ; Rodrigo Voivodic ; Marcos Lima 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：632
页码：1-14
DOI：10.1051/0004-6361/201935949
语种：English
出版社：EDP Sciences
摘要：Modified gravity (MG) theories aim to reproduce the observed acceleration of the Universe by reducing the dark sector while simultaneously recovering General Relativity (GR) within dense environments. Void studies appear to be a suitable scenario to search for imprints of alternative gravity models on cosmological scales. Voids cover an interesting range of density scales where screening mechanisms fade out, which reaches from a density contrastδ ≈ −1 close to their centers toδ ≈ 0 close to their boundaries. We present an analysis of the level of distinction between GR and two modified gravity theories, the Hu–Sawickif(R) and the symmetron theory. This study relies on the abundance, linear bias, and density profile of voids detected inN-body cosmological simulations. We define voids as connected regions made up of the union of spheres with a mean density given byρ̅v= 0.2ρ̅m, but disconnected from any other voids. We find that the height of void walls is considerably affected by the gravitational theory, such that it increases for stronger gravity modifications. Finally, we show that at the level of dark matterN-body simulations, our constraints allow us to distinguish between GR and MG models with |fR0| > 10−6andzSSB > 1. Differences of best-fit values for MG parameters that are derived independently from multiple void probes may indicate an incorrect MG model. This serves as an important consistency check.
关键词：enlarge-scale structure of Universe