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On the final definition of the causal boundary and its relation with the conformal boundary
causal structure Kronheimer and Penrose construction chronological sets and completions causal boundary conformal boundary globally hyperbolic spacetimes naked singularities Penrose-Carter diagrams
2010/3/19
The notion of causal boundary $\partial M$ for a strongly causal spacetime $M$ has been a controversial topic along last decades: on one hand, some attempted definitions were not fully consistent, on ...
It is here argued that the problem of a meaningful defininition of "planet" is best addressed on a dynamical basis; we show that in this way it is possible to obtain a planet de¯nition that is bo...
THE NEW KINEMATICAL DEFINITION OF ORBITAL ECCENTRICITY
Galaxy: kinematics and dynamics a kinematical nature three-dimensional orbits
2010/10/29
A new concept of orbital eccentricity is given. The dimensionless quantities proposed in the present paper to serve as orbital eccentricities have a kinematical nature. The purpose is to use them in d...