重子声学振荡 (BAO) 测量的宇宙学含义
摘要
我们结合重子声学振荡 (BAO) 测量与宇宙微波背景 (CMB) 及 Ia 型超新星 (SN) 数据，推导了对宇宙学参数的约束并对暗能量模型进行了检验。我们利用了 SDSS-III 的 BOSS 巡天中来自星系成团性和 Ly-alpha 森林 (LyaF) 的高精度 BAO 测量。仅 BAO 数据即可高置信度地探测到暗能量，并与 CMB 角声学尺度结合进一步暗示宇宙接近平坦。将 BAO 和 SN 数据结合成“逆距离阶梯”，得到了 km/s/Mpc 的 1.7% 精度测量。该测量假设标准的复合前物理过程，但对暗能量或空间曲率的假设不敏感，因此与假设平坦 LCDM 宇宙学的基于 CMB 的估计值一致，是对这一最小宇宙学模型的重要佐证。对于开放 LCDM，我们的 BAO+SN+CMB 组合得出 和曲率 。当我们允许更一般形式的演化暗能量时，BAO+SN+CMB 的参数约束仍与平坦 LCDM 一致。虽然模型拟合的整体 令人满意，但 LyaF BAO 测量与模型预测存在中等程度（2-2.5 sigma）的张力。具有早期暗能量且在高红移处追踪主导能量成分的模型与我们的约束保持一致。仅凭膨胀历史即可得出中微子种类质量总和的上限为 0.56 eV，若包含 Planck CMB 透镜效应则改进为 0.26 eV。受我们数据约束的标准暗能量模型预测的物质成团水平较高，高于大多数但并非所有观测估计值。（略）
引用
@article{arxiv.1411.1074,
title = {Cosmological implications of baryon acoustic oscillation (BAO) measurements},
author = {Éric Aubourg and Stephen Bailey and Julian E. Bautista and Florian Beutler and Vaishali Bhardwaj and Dmitry Bizyaev and Michael Blanton and Michael Blomqvist and Adam S. Bolton and Jo Bovy and Howard Brewington and J. Brinkmann and Joel R. Brownstein and Angela Burden and Nicolás G. Busca and William Carithers and Chia-Hsun Chuang and Johan Comparat and Antonio J. Cuesta and Kyle S. Dawson and Timothée Delubac and Daniel J. Eisenstein and Andreu Font-Ribera and Jian Ge and J. -M. Le Goff and Satya Gontcho A Gontcho and J. Richard Gott and James E. Gunn and Hong Guo and Julien Guy and Jean-Christophe Hamilton and Shirley Ho and Klaus Honscheid and Cullan Howlett and David Kirkby and Francisco S. Kitaura and Jean-Paul Kneib and Khee-Gan Lee and Dan Long and Robert H. Lupton and Mariana Vargas Magaña and Viktor Malanushenko and Elena Malanushenko and Marc Manera and Claudia Maraston and Daniel Margala and Cameron K. McBride and Jordi Miralda-Escudé and Adam D. Myers and Robert C. Nichol and Pasquier Noterdaeme and Sebastián E. Nuza and Matthew D. Olmstead and Daniel Oravetz and Isabelle Pâris and Nikhil Padmanabhan and Nathalie Palanque-Delabrouille and Kaike Pan and Marcos Pellejero-Ibanez and Will J. Percival and Patrick Petitjean and Matthew M. Pieri and Francisco Prada and Beth Reid and Natalie A. Roe and Ashley J. Ross and Nicholas P. Ross and Graziano Rossi and Jose Alberto Rubiño-Martín and Ariel G. Sánchez and Lado Samushia and Ricardo Tanausú Génova Santos and Claudia G. Scóccola and David J. Schlegel and Donald P. Schneider and Hee-Jong Seo and Erin Sheldon and Audrey Simmons and Ramin A. Skibba and Anže Slosar and Michael A. Strauss and Daniel Thomas and Jeremy L. Tinker and Rita Tojeiro and Jose Alberto Vazquez and Matteo Viel and David A. Wake and Benjamin A. Weaver and David H. Weinberg and W. M. Wood-Vasey and Christophe Yèche and Idit Zehavi and Gong-Bo Zhao},
journal= {arXiv preprint arXiv:1411.1074},
year = {2015}
}
备注
38 pages, 20 figures, BOSS collaboration paper; v2: fixed inconsistent definitions of DH, added references; v3: version accepted by PRD, corrected error resulting in significantly weaker constraints on decaying dark matter model