# Table 2 The effects of Gauss–Bonnet coupling constant \(\alpha \) to the accretion mechanism, shock cones, and physical interpretation are summarized. *D* represents decreasing while *I* represents increasing. *SS*, *SC*, *PD* stand for Steady State, Shock Cone, and Power Mode, respectively

From: Bondi–Hoyle accretion around the non-rotating black hole in 4D Einstein–Gauss–Bonnet gravity

Time to reach the SS | ||||

\(\alpha = -12\) | \(\Longleftarrow (I)\) | \(\alpha = 0\) | \(\Longleftarrow (I)\) | \(\alpha < 1\) |

Density inside the SC | ||||

\(\alpha = -12\) | \(\Longleftarrow (D)\) | \(\alpha = 0\) | \(\Longleftarrow (I)\) | \(\alpha < 1\) |

Max. PD after saturation | ||||

\(\alpha = -12\) | \(\Longleftarrow (D)\) | \(\alpha = 0\) | \(\Longleftarrow (D)\) | \(\alpha < 1\) |

The shock location | ||||

\(\alpha = -12\) | \(\Longleftarrow (D)\) | \(\alpha = 0\) | \(\Longleftarrow (D)\) | \(\alpha < 1\) |