Questions tagged [cosmic-string]
Questions about properties, dynamics and phenomenology of cosmic strings and superstrings.
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Is the spinning Cosmic String spacetime totally vicious?
The spacetime $(M,g)$ is given locally at each point by the metric:
$$g= -(dt + a \, d \phi)^2 + d\rho^2 + \kappa^2 \rho^2 \, d\phi^2 + dz^2 \ \text{where} \ \ a > 0$$
This is the spacetime of a ...
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What is the manifold topology of a spinning Cosmic String?
Given the following metric which is that of a rotating Cosmic String:
$$g=-c^2 dt^2 + d\rho^2 + (\kappa^2 \rho^2 - a^2) d\phi^2 - 2ac d \phi dt + dz^2.$$
can one determine the manifold topology ...
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The Lebesgue covering dimension of the Cosmic String interval topology
Take the spacetime $(M,g)$ that satisfies Einstein's Field Equations exactly where $g$ is locally:
$$g= - c^2 dt^2 + d \rho^2 + (\kappa^2 \rho^2 - a^2) d \phi^2 - 2 ac d\phi dt + dz^2 \ $$
in the ...
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Metric of a rotating Cosmic String
I searched on the internet superficially but I couldn't find it.
Is there any reference that find the solution to Einstein's Field Equations for a rotating Cosmic String?
Personally haven't got the ...
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Cosmic string in real space
I am considering $U(1)$ global cosmic string.
In the case of wine-bottle potential with real field ($\phi$), it is known that there exists a static solution that corresponds to cosmic string (or ...
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Analytic formulae for the gravitational field of a cosmic string/domain wall?
Is there any analytical approximate (newtonian, postnewtonian) formulae for the gravitational field/potential of cosmic strings/domain walls?
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Cosmic Strings as Topological Defects (heuristics)
I have a lot of troubles to understand heuristically the principle behind Kibble's model for genesis of cosmic strings via Kibble mechanism. More precisely I not understand how to interpret following ...
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Could inhomogeneties and/or topological defects break the fundamental symmetries of the universe?
I have heard that some types of inhomogeneties and topological defects (like cosmic strings) in cosmology have been proposed to be able to break fundamental symmetries of nature such as the Poincaré, ...
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Understanding the units of cosmic string number density
I am reading this old paper: https://arxiv.org/pdf/1309.6637.pdf and trying to work out the units in equation 63. It gives the number density of cosmic strings in the radiation era as
$$
\frac{n(\ell,...
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How does the Higgs field energy state relate to the tension of a Cosmic String?
I understand these cracks are massless objects, but if a string has an apparent mass from its warping of spacetime, how does this relate to the higher energy value of the Higgs field the Cosmic String ...
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Cosmic strings increasing internal energy as the Universe expands?
I was reading an article by Edward Harrison, which tackles the problems of conservation of energy at cosmological scales.
At some part (point 2.4) he cites several article, including one by Rees and ...
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What if a cosmic string is eaten by two black holes?
What happens if you have a long cosmic string, each end of which is swallowed by a different blackhole, and the black holes have trajectories that will take them further away from eachother?
WHat ...
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Can cosmological defects escape a black hole?
Based on my understanding, anything that can't move faster than light can't get out of a black hole, but space can since it can move faster than light (hence cosmic inflation is exponentiated).
Also, ...
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Using a stress-energy tensor in linearized Einstein equations
I am using a known stress-energy tensor to try to find $h_{\mu\nu}$, the small deviations from flat space in the linearized Einstein formalism. In harmonic gauge,
$$
\square h_{\mu\nu}=-16\pi GT_{\mu\...
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Can a cosmic string pass through the earth undetected?
The metric around a straight, static and infinitely long cosmic string is flat except for the topological deficit in the angular coordinate, as described for example here. As a result, there is no ...
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