The question Performance of a pumpless liquid rocket engine is thoughtful and provocative and pretty much all answers include a mention of the extremely high pressure necessary to push propellants into a high pressure combustion chamber and the use of turbo pumps for this purpose.

But this is based on steady-state combustion in the chamber, and the rotating detonation rocket engine is a horse of a different color.

Question: Would rotating detonation rocket engines always require high pressure fuel pumps?

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    $\begingroup$ Yesterday's “possible to prevent instability by injecting at choking condition?”, which doesn't seem to have reached much attention, is also highly related to this (choked flow ~ supersonic flow, detonation ~ supersonic combustion). $\endgroup$ Jul 16, 2020 at 9:13
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    $\begingroup$ Aren't they air-breathing? A potential competitor to jets, not to vacuum-capable rocket engines though, it seems to me. $\endgroup$
    – SF.
    Jul 16, 2020 at 11:48