cosmic strings


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cosmic strings

Linelike defects in spacetime that are infinitesimally thin but of very high mass. They can be either in an infinite linear form or a closed loop. Cosmic strings in the early Universe could act as gravitational condensates to promote galaxy formation. There is as yet no experimental support for their existence, but they could produce linelike anisotropies in the cosmic microwave background radiation.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
References in periodicals archive ?
Add some long cosmic strings to give the wormhole some tension, which would prevent the black holes from attracting each other and support the bridge or tunnel.A
"Everybody would like them to be really exotic: evaporating black holes, cosmic strings, something like that.
Cosmic Strings would also be doing an online release of their album on Itunes and other big online music stores soon post their website based release of their album.
When Gott looked at the equations of general relativity to see what they said about spacetime in the vicinity of a single cosmic string, he found that it would offer no possibility of time travel.
They say that space-time should have universe-sized snags called 'cosmic strings' running across it, but none have yet been found.
Theory forbids cosmic strings from having ends, so they must appear as loops or infinite strands.
This method was subsequently extended to other singular null objects, in particular massless cosmic strings [27-29].
He describes how time machines could be built using "exotic negative matter" and "negative energy," or by traveling rapidly around two cosmic strings moving toward each other.
Proposals on a growing list range from decaying superheavy particles in this galaxy to colliding cosmic strings of energy stretching across all of space.
Gott, "Closed timelike curves produced by pairs of moving cosmic strings: exact solutions," Physical Review Letters, vol.
Not only does Rees review the astrophysics of neutron stars, black holes, cosmological dark matter, the cosmic microwave background radiation, and cosmic strings (all subjects to which he has made significant research contributions); he also highlights the origin of the chemical elements, the nature of hypothetical wormholes, and the recent discoveries of planets around Sun-like stars.
Spergel and Ue-Li Pen of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., are investigating another type of model, one in which the missing energy would come from a tangle of lightweight cosmic strings distributed throughout the universe.