Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive headquarters building ...

Department of Mathematics, University of California, San Diego, La Jolla, CA 92093, USA Research supported in part by NSF grant #DMS84-09557 and ONR contract #N00014-85-K-0367.

Black holes have kept astrophysicists awake at night since their theoretical conception. A new study explores singularity-free alternatives to these mysterious objects. Since Einstein formulated ...

Sir Roger Penrose — Knight of the Realm, Emeritus Rouse Ball Professor of Mathematics at Oxford University, controversial author, and polymath extraordinaire — is worried that his car might be towed.

An illustration of a magnifying glass. An illustration of a magnifying glass.

There exist many proposed measures on how close a pose is to these singularities. This paper develops a framework which unites many of the existing measures, provides further understanding for others, ...

This mismatch has haunted physicists for decades, leading scientists to explore alternative models that describe black holes without singularities ... to a spacetime geometry that remains regular ...

This naturally leads to models of black holes without singularities, like those explored in the work of Liberati and his collaborators. One of the interesting aspects of the new paper is its ...