2010/09/30 by Yuko Urakawa, Takahiro Tanaka · 4 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Pulsars and Gravitational Waves Research #Relativity and Gravitational Theory #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1143/ptp.125.1067
published as Prog.Theor.Phys.125:1067-1089,2011 · 12 pages; v3: several descriptions are added; v4: accepted version in PTP
crossref issued 2011/05/01 · crossref published 2011/05/01 · crossref published-print 2011/05/01 · openalex publication_date 2011/05/01 · crossref created 2011/05/20 · arxiv created 2011/05/21 · arxiv updated 2011/08/19 · openalex created_date 2016/06/24 · crossref deposited 2017/08/24 · crossref indexed 2026/07/30 · openalex updated_date 2026/07/31
It has been an issue of debate whether the inflationary infrared(IR) divergences are physical or not. Our claim is that, at least, in single-field models, the answer is "No," and that the spurious IR divergence is originating from the careless treatment of the gauge modes. In our previous work we have explicitly shown that the IR divergence is absent in the genuine gauge-invariant quantity at the leading order in the slow-roll approximation. We extend our argument to include higher-order slow-roll corrections and the contributions from the gravitational waves. The key issue is to assure the gauge invariance in the choice of the initial vacuum, which is a new concept that has not been considered in conventional calculations.