The authors claim generalized Proca theory cannot produce a stable non-singular bounce, but the proof relies on an incorrect derivative and a flawed sound-speed argument.
Mukhanov, Physical Foundations of Cosmology(Cam- bridge University Press, Oxford, 2005)
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To bounce or not to bounce in generalized Proca theory and beyond
The authors claim generalized Proca theory cannot produce a stable non-singular bounce, but the proof relies on an incorrect derivative and a flawed sound-speed argument.