Instability of spacelike and null orbifold singularities

By G. Horowitz, J. Polchinski. 2002

203 citations recorded by the source corpus.

Time dependent orbifolds with spacelike or null singularities have recently been studied as simple models of cosmological singularities. We show that their apparent simplicity is an illusion: the introduction of a single particle causes the spacetime to collapse to a strong curvature singularity (a Big Crunch), even in regions arbitrarily far from the particle.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/a9439070d768cdba0a10e7eb57b5b6a6a7a14ba1

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Citations in the corpus

A matrix big bang (2005, background): “The same question has been addressed for the Milne orbifold as (two dimensions of) a space-time background in perturbative string theory [5, 6].”
Comments on Cosmological Singularities in String Theory (2002, background): “A natural guess is that these interactions are a first step in the process of creation of black holes out of these colliding particles, as in [17].”
Hot spacetimes for cold atoms (2008, background): “Finally, and most sharply, even in the strict T → 0 case, the dynamics will resolve this “singularity” in a fashion familiar from the study of null orbifolds of flat space [30, 31, 32, 33]: a pulse of stress-energy sent towards large r is steadily blue-shifted until its back-reaction is no longer ne”
Time‐dependent orbifolds and string cosmology (2003, unknown): “Physically, the acceleration induces a stronger coupling to the graviton, enhancing the exchange of this particle. One way to see this is given by the argument, put forward by Horowitz and Polchinski [8], for the formation of large black holes. We shall review this argument below and comment on its ”
The black hole singularity in AdS/CFT (2003, result): “Despite much recent work [1,2,3,4,5,6,7,8,9,10, 11 ,12,13,14], these issues remain mysterious.”
Inflation and string cosmology (2001, background): “However, since the theory of density perturbations in cyclic inflation requires a solution of the cosmological singularity problem [63, 64], it is difficult to say anything definite about it.”
Solvable model of strings in a time-dependent plane-wave background (2002, background): “images of the fixed point in global coordinates: as pointed out by Horowitz and Polchinski [49], there an introduction of a single particle makes the spacetime to collapse.”
A smooth bouncing cosmology with scale invariant spectrum (2007, background): “The study of time-dependent solutions in string theory and of the way singularities are resolved is not sufficiently developed to describe a bouncing phase or even to assess if a bounce is possible altogether [1, 4, 5, 6, 7, 8, 9, 10].”
Homogeneous plane waves (2002, background): “uesrelated to the natureof their singularities (stability, mode creation, backreaction, ...) in a string theory setting, in the spirit of recent studies of time-dependent orbifolds and related models [47, 48, 49, 50, 51]. In particular, one could, as in [30], explore the possibility of continuing st”
Inflationary Cosmology after Planck 2013 (2014, background): “Originally there was a hope that the problem of the cosmological singularity, which emerges during the ekpyrotic/cyclic collapse, will be solved in the context of string theory, but despite the attempts of the best experts in string theory, this problem remains unsolved [184, 185, 186].”