Stability analysis and improvement of the covariant BSSN formulation against the FLRW spacetime background

Hidetomo Hoshino, Takuya Tsuchiya, Gen Yoneda

In this study, we investigate the numerical stability of the covariant Baumgarte--Shapiro--Shibata--Nakamura (cBSSN) formulation against the Friedmann--Lemaître--Robertson--Walker…