actual global solution / kinetic and total energy / symmetric vacuum solution / equilibrium systems / monatomic ideal gas / positive potential energy / internal solution / energy basis / energy eigenstates / internal energy / interstellar gas / energy / /
5 The Time Arrow of Spacetime Geometry In the framework of general relativity, gravity is a consequence of spacetime curvature. Its dynamical laws (Einstein’s field equations) are again symmetric under time reversal.