Results 141 to 150 of about 108,791 (169)

Spacetime singularities in string theory

Physical Review Letters, 1990
Summary: It is shown that a large class of time-dependent solutions to Einstein's equation are classical solutions to string theory. These include metrics with large curvature and some with spacetime singularities. Unlike the case of orbifold singularities, it is shown that string propagation through the singluar region is not well behaved.
Gary Horowitz
exaly   +3 more sources

No more spacetime singularities?

General Relativity and Gravitation, 1994
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
V Alan Kostelecký
exaly   +3 more sources

Singularities and the geometry of spacetime

open access: yesThe European Physical Journal H, 2014
The aim of this essay is to investigate certain aspects of the geometry of the spacetime manifold in the General Theory of Relativity with particular reference to the occurrence of singularities in cosmological solutions and their relation with other global properties. Section 2 gives a brief outline of Riemannian geometry.
Stephen Hawking
openaire   +2 more sources

Quantum healing of spacetime singularities: A review

open access: yesModern Physics Letters A, 2018
Singularities are commonplace in general relativistic spacetimes. It is natural to hope that they might be “healed” (or resolved) by the inclusion of quantum mechanics, either in the theory itself (quantum gravity) or, more modestly, in the description ...
T M Helliwell, D A Konkowski
exaly   +2 more sources

Strengths of singularities in Vaidya spacetimes

Physical Review D, 1987
The strengths of shell-focusing singularities in the ingoing Vaidya spacetimes are examined in terms of limiting focusing conditions. The singularities are found to be strong-curvature singularities only for mass functions which are initially linear functions of the advanced time.
, Rajagopal, , Lake
openaire   +2 more sources

Strings falling into spacetime singularities

Physical Review D, 1992
We study the dynamics of strings near spacetime singularities. We consider gravitational-wave backgrounds with a singularity of the type {vert bar}{ital U}{vert bar}{sup {minus}{beta}}, {ital U} being a null coordinate. (The case with a {delta}({ital U}) shock-wave singularity turns out to be similar to the {beta}=1 case.) New features in the string ...
de Vega, Héctor J., Sánchez, Norma G.
openaire   +3 more sources

QUANTUM SINGULARITY OF QUASIREGULAR SPACETIMES

The Ninth Marcel Grossmann Meeting, 2002
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Konkowski, D. A., Helliwell, T. M.
openaire   +1 more source

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