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- W4327604037 abstract "Analytical spherically symmetric static solution to the set of Einstein and Klein-Gordon equations in a synchronous reference frame is considered. In a synchronous reference frame, a static solution exists in the ultrarelativistic limit p=−ε/3. Pressure p is negative when matter tends to contract. The solution pretends to describe a collapsed black hole. The balance at the boundary with dark matter ensures the static solution for a black hole. There is a spherical layer inside a black hole between two “gravitational” radii rg and rh>rg, where the solution exists, but it is not unique. In a synchronous reference frame, detgik and grr do not change signs. The non-uniqueness of solutions with boundary conditions at r=rg and r=rh makes it possible to find the gravitational field both inside and outside a black hole. The synchronous reference frame allows one to find the remaining mass of the condensate. In the model “λψ4”, total mass M=3c2/2k rh is three times that of what a distant observer sees. This gravitational mass defect is spent for bosons to be in the bound ground state, and for the balance between elasticity and density of the condensate." @default.
- W4327604037 created "2023-03-17" @default.
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- W4327604037 date "2023-03-06" @default.
- W4327604037 modified "2023-09-25" @default.
- W4327604037 title "Bose-Einstein Condensate in Synchronous Coordinates" @default.
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- W4327604037 doi "https://doi.org/10.3390/ecu2023-14121" @default.
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