Work

Late-time cosmology without dark sector but with closed string massless sector

Year: 2024

Type: article

Abstract: We explore the possibility of solving the dark energy and the coincidence problems by postulating the massless sector of closed strings. This sector constitutes the gravitational multiplet of string theory and, when applied to four-dimensional cosmology, predicts that the expansion of an open Universe defined in string frame is readily accelerating . We confront the prediction with the late-time cosmological data of Type Ia supernovae and quasar absorption spectrum , which probe the evolutions of the Hubble parameter and possibly the fine-structure constant. We report that these observations are in admirable agreement with the prediction without any dark sector or coincidence problem. We estimate the Hubble constant , H 0 ≃ 71.2 ± 0.2 km / s / Mpc .

Source: Physics Letters B

DOI: 10.1016/j.physletb.2024.139215

Authors: Hocheol Lee, Jeong-Hyuck Park, Liliana Velasco-Sevilla, Lu Yin

Institutions: Sogang University, Shanghai University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond