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Sound Wave in the Backreaction Affected Spacetime in Analogue Gravity Based on Number-Conserving Approach
Adopting a number-conserving approach, we show that the sound wave in the backreaction-affected dynamical spacetime obeys the equations of motion for a massive scalar field in an analogue spacetime. Even with backreaction, the analogue metric has the same form as that without backreaction, except th
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