چکیده
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We impose perfect fluid concept along with slow expansion approximation to derive new
solutions which, considering non-static spherically symmetric metrics, can be treated
as Black Holes (BHs). We will refer to these solutions as Quasi BHs. Mathematical
and physical features such as Killing vectors, singularities, and mass have been studied.
Their horizons and thermodynamic properties have also been investigated. In addition,
relationship with other related works (including McVittie’s) are described.
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