Media type: E-Article Title: Constraint on the primordial vector mode and its magnetic field generation from seven-year Wilkinson Microwave Anisotropy Probe observations Contributor: Ichiki, Kiyotomo; Takahashi, Keitaro; Sugiyama, Naoshi Published: American Physical Society (APS), 2012 Published in: Physical Review D, 85 (2012) 4 Language: English DOI: 10.1103/physrevd.85.043009 ISSN: 1550-7998; 1550-2368 Origination: University thesis: Footnote: