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gr-qc2021
Causally simple spacetimes and naked singularities
Mehdi Vatandoost, Rahimeh Pourkhandani, Neda Ebrahimi
In this paper, We prove a conjecture which states that if M is a nakedly singular future boundary or nakedly singular past boundary spacetime, then the space of null geodesics, N,…
gr-qc2020
The cosmological time functions and lightlike rays
Fatemeh Koohestani, Neda Ebrahimi, Mehdi Vatandoost +1
It is proved that all discontinuity points of a finite cosmological time function, , are on past lightlike rays. As a result, it is proved that if is a chronological spa…