Planck 2013 结果. XXIV. 对原初非高斯性的限制
宇宙学与河外天体物理
2014-10-29 v2
摘要
Planck 标称任务宇宙微波背景辐射 (CMB) 图谱对原初非高斯性 (NG) 给出了前所未有的限制。使用三种最优双谱估计器——可分模板拟合 (KSW)、分箱估计和模态估计——我们得到了一致的原初局域型、等边型和正交型双谱振幅值,最终结果为 fNL^local= 2.7+/-5.8, fNL^equil= -42+/-75, fNL^ortho= -25+/-39 (68% CL 统计误差)。在数据中检测到了 NG;使用 skew-C_l 统计量,我们发现了来自残余点源的非零双谱,以及符合 LambdaCDM 情景预期水平的 ISW-透镜双谱。这些结果基于对这些估计器在高斯和非高斯模拟上的全面交叉验证,在成分分离技术之间保持稳定,通过了广泛的测试套件,并得到 skew-C_l、小波双谱和 Minkowski 泛函估计器的确认。除了对单个形状振幅的估计外,我们还给出了 Planck CMB 双谱的模型无关三维重构,从而导出了对产生原初 NG 的早期宇宙情景的限制,包括一般单场暴胀模型、激发初态 (非 Bunch-Davies 真空) 以及方向依赖的矢量模型。我们对尺度依赖的特征模型和共振模型进行了初步调查。这些结果限制了一般单场和多场模型的参数范围,例如在有效场论参数化中,声速 c_s \geq 0.02 (95% CL),以及曲率子衰变分数 r_D \geq 0.15 (95% CL)。Planck 数据显著限制了 ekpyrotic/cyclic 情景的可行参数空间。局域模型中 4 点函数的振幅 tauNL < 2800 (95% CL)。这些限制代表了迄今为止对宇宙结构起源物理机制的最高精度检验。
引用
@article{arxiv.1303.5084,
title = {Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity},
author = {Planck Collaboration and P. A. R. Ade and N. Aghanim and C. Armitage-Caplan and M. Arnaud and M. Ashdown and F. Atrio-Barandela and J. Aumont and C. Baccigalupi and A. J. Banday and R. B. Barreiro and J. G. Bartlett and N. Bartolo and E. Battaner and K. Benabed and A. Benoît and A. Benoit-Lévy and J. -P. Bernard and M. Bersanelli and P. Bielewicz and J. Bobin and J. J. Bock and A. Bonaldi and L. Bonavera and J. R. Bond and J. Borrill and F. R. Bouchet and M. Bridges and M. Bucher and C. Burigana and R. C. Butler and J. -F. Cardoso and A. Catalano and A. Challinor and A. Chamballu and H. C. Chiang and L. -Y Chiang and P. R. Christensen and S. Church and D. L. Clements and S. Colombi and L. P. L. Colombo and F. Couchot and A. Coulais and B. P. Crill and A. Curto and F. Cuttaia and L. Danese and R. D. Davies and R. J. Davis and P. de Bernardis and A. de Rosa and G. de Zotti and J. Delabrouille and J. -M. Delouis and F. -X. Désert and J. M. Diego and H. Dole and S. Donzelli and O. Doré and M. Douspis and A. Ducout and J. Dunkley and X. Dupac and G. Efstathiou and F. Elsner and T. A. Enßlin and H. K. Eriksen and J. Fergusson and F. Finelli and O. Forni and M. Frailis and E. Franceschi and S. Galeotta and K. Ganga and M. Giard and Y. Giraud-Héraud and J. González-Nuevo and K. M. Górski and S. Gratton and A. Gregorio and A. Gruppuso and F. K. Hansen and D. Hanson and D. Harrison and A. Heavens and S. Henrot-Versillé and C. Hernández-Monteagudo and D. Herranz and S. R. Hildebrandt and E. Hivon and M. Hobson and W. A. Holmes and A. Hornstrup and W. Hovest and K. M. Huffenberger and A. H. Jaffe and T. R. Jaffe and W. C. Jones and M. Juvela and E. Keihänen and R. Keskitalo and T. S. Kisner and J. Knoche and L. Knox and M. Kunz and H. Kurki-Suonio and F. Lacasa and G. Lagache and A. Lähteenmäki and J. -M. Lamarre and A. Lasenby and R. J. Laureijs and C. R. Lawrence and J. P. Leahy and R. Leonardi and J. Lesgourgues and A. Lewis and M. Liguori and P. B. Lilje and M. Linden-Vørnle and M. López-Caniego and P. M. Lubin and J. F. Macías-Pérez and B. Maffei and D. Maino and N. Mandolesi and A. Mangilli and D. Marinucci and M. Maris and D. J. Marshall and P. G. Martin and E. Martínez-González and S. Masi and M. Massardi and S. Matarrese and F. Matthai and P. Mazzotta and P. R. Meinhold and A. Melchiorri and L. Mendes and A. Mennella and M. Migliaccio and S. Mitra and M. -A. Miville-Deschênes and A. Moneti and L. Montier and G. Morgante and D. Mortlock and A. Moss and D. Munshi and J. A. Murphy and P. Naselsky and P. Natoli and C. B. Netterfield and H. U. Nørgaard-Nielsen and F. Noviello and D. Novikov and I. Novikov and S. Osborne and C. A. Oxborrow and F. Paci and L. Pagano and F. Pajot and D. Paoletti and F. Pasian and G. Patanchon and H. V. Peiris and O. Perdereau and L. Perotto and F. Perrotta and F. Piacentini and M. Piat and E. Pierpaoli and D. Pietrobon and S. Plaszczynski and E. Pointecouteau and G. Polenta and N. Ponthieu and L. Popa and T. Poutanen and G. W. Pratt and G. Prézeau and S. Prunet and J. -L. Puget and J. P. Rachen and B. Racine and R. Rebolo and M. Reinecke and M. Remazeilles and C. Renault and A. Renzi and S. Ricciardi and T. Riller and I. Ristorcelli and G. Rocha and C. Rosset and G. Roudier and J. A. Rubiño-Martín and B. Rusholme and M. Sandri and D. Santos and G. Savini and D. Scott and M. D. Seiffert and E. P. S. Shellard and K. Smith and L. D. Spencer and J. -L. Starck and V. Stolyarov and R. Stompor and R. Sudiwala and R. Sunyaev and F. Sureau and P. Sutter and D. Sutton and A. -S. Suur-Uski and J. -F. Sygnet and J. A. Tauber and D. Tavagnacco and L. Terenzi and L. Toffolatti and M. Tomasi and M. Tristram and M. Tucci and J. Tuovinen and L. Valenziano and J. Valiviita and B. Van Tent and J. Varis and P. Vielva and F. Villa and N. Vittorio and L. A. Wade and B. D. Wandelt and M. White and S. D. M. White and D. Yvon and A. Zacchei and A. Zonca},
journal= {arXiv preprint arXiv:1303.5084},
year = {2014}
}
备注
59 pages; LaTeX; 26 figures. This paper is one of a set associated with the 2013 data release from Planck. Updated version