2017/03/13 by Hongliang Jiang, Yi Wang, Jiang, Hongliang +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.48550/arxiv.1703.04477
12 pages, 3 figures. Published version
openalex publication_date 2017/03/13 · arxiv created 2017/07/05 · arxiv updated 2017/07/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
During inflation, massive fields can contribute to the power spectrum of curvature perturbation via a dimension-5 operator. This contribution can be considered as a bias for the program of using ns and r to select inflation models. Even the dimension-5 operator is suppressed by Λ= Mp, there is still a significant shift on the ns-r diagram if the massive fields have m∼ H. On the other hand, if the heavy degree of freedom appears only at the same energy scale as the suppression scale of the dimension-5 operator, then significant shift on the ns-r diagram takes place at m=Λ∼ 70H, which is around the inflationary time-translation symmetry breaking scale. Hence, the systematics from massive fields pose a greater challenge for future high precision experiments for inflationary model selection. This result can be thought of as the impact of UV sensitivity to inflationary observables.