{"paper":{"title":"Limits on anisotropic inflation from the Planck data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Eiichiro Komatsu, Jaiseung Kim","submitted_at":"2013-10-06T17:17:51Z","abstract_excerpt":"Temperature anisotropy of the cosmic microwave background offers a test of the fundamental symmetry of spacetime during cosmic inflation. Violation of rotational symmetry yields a distinct signature in the power spectrum of primordial fluctuations as $P({\\mathbf k})=P_0(k)[1+g_*(\\hat{\\mathbf k}\\cdot\\hat{\\mathbf E}_{\\rm cl})^2]$, where $\\hat{\\mathbf E}_{\\rm cl}$ is a preferred direction in space and $g_*$ is an amplitude. Using the \\textit{Planck} 2013 temperature maps, we find no evidence for violation of rotational symmetry, $g_*=0.002\\pm 0.016$ (68% CL), once the known effects of asymmetry o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.1605","kind":"arxiv","version":4},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}