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On the Difference between Physics and Biology: Logical Branching and Biomolecules
George Ellis, Jonathan Kopel
Physical emergence - crystals, rocks, sandpiles, turbulent eddies, planets, stars - is fundamentally different from biological emergence - amoeba, cells, mice, humans - even though…
Rotating and twisting locally rotationally symmetric spacetimes: a general solution
Sayuri Singh, George F. R. Ellis, Rituparno Goswami +1
In this paper we derive a general solution for the most general rotating and twisting locally rotationally symmetric spacetimes. This is achieved in three steps. First we decompose…
Static trace free Einstein equations and stellar distributions
Sudan Hansraj, Rituparno Goswami, George Ellis +1
We construct models of static spherical distributions of perfect fluid in trace--free Einstein gravity theory. The equations governing the gravitational field are equivalent to the…