2024/06/19 by Hamid Shabani, Avik De, Shabani, Hamid +3 · 3 citations
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #Relativity and Gravitational Theory
paper · pdf · doi:10.48550/arxiv.2406.13189
openalex publication_date 2024/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Within the context of metric-affine gravity, we examine the significance of the boundary term in symmetric teleparallel gravity by employing the cosmological dynamical system analysis method. We focus on the novel gravity models characterized by the functions f(Q,C), where f is a smooth function of the non-metricity scalar Q and the associated boundary term C. In a cosmological setting adopting three different classes of symmetric teleparallel affine connections, we investigate a model f(Q,C)=Qs+eCr, and some special cases of this model. We show that the boundary term which is added to the Einsteinian field equations (or equivalently to f(Q)=Q ones) are capable of bringing forward solutions corresponding to the early accelerated expansion. This alludes the physics behind the boundary terms which usually are discarded in the most gravitational theories.