Direct search for features in the primordial bispectrum

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• 作者：Stephen Appleby^a ; ^b ; ^{stephen@kias.re.kr" class="auth_mail" title="E-mail the corresponding author} ; Jinn-Ouk Gong^b ; ^c ; ^{jinn-ouk.gong@apctp.org" class="auth_mail" title="E-mail the corresponding author} ; Dhiraj Kumar Hazra^b ; ^d ; ^{dhiraj.kumar.hazra@apc.univ-paris7.fr" class="auth_mail" title="E-mail the corresponding author} ; Arman Shafieloo^e ; ^f ; ^{shafieloo@kasi.re.kr" class="auth_mail" title="E-mail the corresponding author} ; Spyros Sypsas^b ; ^g ; ^{s.sypsas@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 September 2016
• 年：2016
• 卷：760
• 期：Complete
• 页码：297-301
• 全文大小：1547 K

文摘

We study features in the bispectrum of the primordial curvature perturbation correlated with the reconstructed primordial power spectrum from the observed cosmic microwave background temperature data. We first show how the bispectrum can be completely specified in terms of the power spectrum and its first two derivatives, valid for any configuration of interest. Then using a model-independent reconstruction of the primordial power spectrum from the Planck angular power spectrum of temperature anisotropies, we compute the bispectrum in different triangular configurations. We find that in the squeezed limit at xt stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303458&_mathId=si1.gif&_user=111111111&_pii=S0370269316303458&_rdoc=1&_issn=03702693&md5=9a88d4750f06046e855534b868eac330" title="Click to view the MathML source">k∼0.06 Mpc⁻¹ and xt stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303458&_mathId=si2.gif&_user=111111111&_pii=S0370269316303458&_rdoc=1&_issn=03702693&md5=bd6f242c933acb7c576aaebe1529b64d" title="Click to view the MathML source">k∼0.014 Mpc⁻¹ there are marginal 2σ deviations from the standard featureless bispectrum, which meanwhile is consistent with the reconstructed bispectrum in the equilateral configuration.