Physics Letters B, Volume 687, Issues 2-3, 12 April 2010, Pages 110-113
doi:10.1016/j.physletb.2010.03.029
Copyright © 2010 Elsevier B.V. All rights reserved.
Radial motion into an Einstein–Rosen bridge
Nikodem J. Pop?awski (a), E-mail The Corresponding Author
(a) Department of Physics, Indiana University, Swain Hall West, 727 East Third Street, Bloomington, IN 47405, USA
Received 12 May 2009; revised 8 March 2010; accepted 9 March 2010.
Editor: S. Dodelson.
Available online 11 March 2010.Abstract
We consider the radial geodesic motion of a massive particle into a black hole in isotropic coordinates, which represents the exterior region of an Einstein–Rosen bridge (wormhole). The particle enters the interior region, which is regular and physically equivalent to the asymptotically flat exterior of a white hole, and the particle’s proper time extends to infinity. Since the radial motion into a wormhole after passing the event horizon is physically different from the motion into a Schwarzschild black hole, Einstein–Rosen and Schwarzschild black holes are different, physical realizations of general relativity. Yet for distant observers, both solutions are indistinguishable. We show that timelike geodesics in the field of a wormhole are complete because the expansion scalar in the Raychaudhuri equation has a discontinuity at the horizon, and because the Einstein–Rosen bridge is represented by the Kruskal diagram with Rindler’s elliptic identification of the two antipodal future event horizons. These results suggest that observed astrophysical black holes may be Einstein–Rosen bridges, each with a new universe inside that formed simultaneously with the black hole. Accordingly, our own Universe may be the interior of a black hole existing inside another universe.
…in essence what falls in our Universe could pop-out in another as a part of that Universe’s originating “White Hole”/Big Bang – and we’d be none the wiser, because it all happens on the other side of an Event Horizon, the surface of no-return, from which no knowledge of the Beyond can emerge. Or, if the Schwarzschild geometry is correct, one is inexorably drawn into a singularity and crushed into oblivion… either way, a leap into the utterly Unknowable Unknown.
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