Apparently, this user prefers to keep an air of mystery about them.
21 Wormholes & Time Machines - for *experts* in GR/maths Jan 14 '11
4 What is the definition of physically meaningful? Jan 22 '11
3 Uniqueness or multiplicity of ADM masses for spacetime manifolds with more than one “end”? Jan 29 '15
2 Calculation of co-moving coordinate separation for a moving object in a time-varying spacetime metric Jan 22 '15