2018/04/05 by Lee, Seokcheon
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.1804.01678
Starobinsky has suggested an inflation model which is obtained from the vacuum Einstein's equations modified by the one-loop corrections due to quantized matter fields. Although the one-loop gravitational action is not known for a general FRW background, it can be obtained in a de Sitter space to give \Mp2 R + αR2 + βR2 ln (R/M2). Thus, one needs to investigate the inflationary behavior of this model compared to the Starobinsky model (i.e. β= 0). The coefficient α can be changed by varying the renormalization scale M2 and β is obtained from the quantum anomaly which is related to the numbers of quantum fields. It has been assumed that α≫ β. We investigate the viable values of α and β based on the CMB observation. We also scrutinize the reheating process in this model.