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In this paper we consider the negative energy problem in generalized Vaidya
spacetime. We consider several models when we have the naked singularity as a
result of the gravitational collapse. In these models we investigate the
geodesics for particles with negative energy when the II type of the matter
field satisfies the equation of the state $P=\alpha \rho$ ($\alpha \in [0\,, 1]$).

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