cosmic string

(i) For the metric corresponding to a cosmic string with [19-22]

and describes a cosmic string of rest energy density [mu] and the deficit angle 8[pi][mu].

In the present work, we study the quantum dynamics of a spin-1/2 neutral particle in the presence of an electric field due to an infinitely long, infinitesimally thin line of charge along the z-axis of the cosmic string, with constant charge density on it.

Following the Vilenkin procedure [93], one can identify the near origin metric (28) with a cosmic string and interpret [mu] as the mass per unit length of the string [93].

Richard Gott III of Princeton University, this solution involves two cosmic strings -- a pair of extremely thin, invisible strands of concentrated energy that warp space-time in a peculiar way.

"Everybody would like them to be really exotic: evaporating black holes, cosmic strings, something like that.

Gripped,I watched on -through an increasingly complex discussion of cosmic strings, space- time continuums and loops in the universe -all entertainingly presented,all explained in simple terms,but all utterly impenetrable.

This could be an optical illusion--or perhaps the result of some physical phenomenon such as spherical shock waves colliding or cosmic strings. Barton M.

Many theories predict the existence of cosmic strings.

The theoretical field is thick with candidates such as magnetic monopoles--particles with a single north or south pole--and endless wires of tightly bunched energy called cosmic strings (SN: 12/7/96, p.

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.