Bouncing behavior in f(R,L_m) gravity: Phantom crossing and energy conditions
arxiv(2024)
摘要
In this work, we investigate the bouncing behavior of the universe within the
framework of f(R,L_m) gravity, using a simple form of
f(R,L_m)=R/2+L_m^γ (where γ is a free model parameter) as
previously studied. The model predicts a vanishing Hubble parameter in the
early and late times, with the deceleration parameter approaching a specific
limit at the bouncing point. The EoS parameter is observed to cross the phantom
divide line (ω=-1) near the bouncing point, indicating a significant
transition from a contracting to an expanding phase. The model satisfies the
necessary energy conditions for a successful bouncing scenario, with violations
indicating exotic matter near the bouncing point. Stability conditions are
satisfied for certain values of γ near the bouncing point, but potential
instabilities in late-time evolution require further investigation. Finally, we
conclude that the f(R,L_m) gravity model is promising for understanding the
universe's dynamics, especially during events like the bouncing phase.
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