4 papers
Pressure profile bounds from relaxing the TOV equation
Christopher Simmonds, Matt Visser
We develop several new and quite general bounds on the internal pressure profiles of general relativistic perfect fluid spheres --- based on various ways of relaxing the TOV system…
Effective geometrostatics of spherical stars beyond general relativity
Julio Arrechea, Raúl Carballo-Rubio, Matt Visser
We provide a set of general tools to study the problem of stellar equilibrium in any gravitational theory in which spherically symmetric spacetimes satisfy master field equations t…
Null geodesic defocusing in dynamical black-hole-to-white-hole transitions
Johanna Borissova, Stefano Liberati, Matt Visser
We investigate the defocusing of null geodesics in dynamical, non-singular black-hole-to-white-hole transitions. Working at the level of spacetime kinematics, and without assuming…
Revisiting Schwarzschild's constant density star in isotropic coordinates
Christopher Simmonds, Matt Visser
Herein we shall revisit the venerable 110-year-old topic of Schwarzschild's constant density star, emphasizing that for many (though not quite all) purposes it is much easier to an…