3d steady Gradient Ricci Solitons with linear curvature decay

In this note, we prove that a 3-dimensional steady Ricci soliton is rotationally symmetric if its scalar curvature $R(x)$ satisfies $\frac{C_0^{-1}}{ρ(x)}\le R(x)\le \frac{C_0}{ρ(x)}$ for some constant $C_0>0$, where $ρ(x)$ denotes the distance from a fixed point $x_0$. Our result doesn't assume that the soliton is $κ$-noncollapsed.

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