Besides that, we presents the gravitational wave energy density under the weak field situation and gives the x - y plane numerical calculation to curvature scalar R and energy density .
还有计算了在弱场条件近似下引力驻波的能量密度，并给出曲率标量R和能量密度平面的数值计算。
This problem demonstrates why the energy density of gravitational field is negative.
本题演示为何重力场的能量密度是负的。
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