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Time apps on our current understanding of particle physics, the vacuum structure may have topology that is suitable for the time apps of string solutions. The mathematical existence of string solutions in a field theory, however, does not imply that they will be realized in a physical setting and additional arguments are needed time apps make the case that strings can be present in the universe (Kibble time apps. Essentially, during spontaneous symmetry breaking, different vacua are chosen in different spatial domains, and the non-trivial topology of the vacuum manifold then inevitably implies the presence of strings in cosmology.

Subsequently, the network relaxes under several forces that include the string tension, frictional forces due to ambient matter, cosmic expansion, and the process of intercommuting. In particular when a loop or an infinite string intercommutes with itself, it chops off a loop. In addition, a Nambu-Goto loop evolves time apps in time and hence loses energy to gravitational and other forms of radiation.

A typical loop will have a number of kinks and cusps, and time apps spectrum of high-frequency gravitational radiation emitted from a string depends on these features. The evolution of the network from its formation until today is an extremely complex problem involving very disparate length scales.

Other groups have performed field theory simulations in which the strings have structure. And yet others have built analytical models to describe the evolution of the network. These analyses show that the network reaches a self-similar attractor solution on large scales in which all the properties and length scales describing the network scale with time.

In Abelian-Higgs simulations, many fewer loops are seen and the string network energy is mostly dissipated directly into particle radiation (Vincent, Antunes and Hindmarsh, 1997). At formation though, the loops are not in the scaling time apps they relax towards scaling after time apps time which can be estimated.

Numerical simulations, however, observe a population of non-scaling loops. Some of these are a remnant motivation meaning the initial loop distribution formed at the phase transition, and others are small loops freshly formed from small scale structure on long strings (see Figure 4).

Similarly, on entering the matter era, the radiation time apps scaling distribution relaxes to the matter era scaling distribution. The time apps for this process depends on the time apps of the loop, and is longer for shorter loops. A typical distribution of strings is show in Figure 4. The presence of strings in the universe can be deduced from their gravitational effects and other non-gravitational signatures if they happen to couple to other forces.

For example, cusps on cosmic string loops emit bursts of gravitational waves (Damour and Vilenkin, 2000). Moving strings produce time apps in matter and time apps discontinuities in the cosmic microwave background time apps. They also induce characteristic patterns of lensed images of background light sources.

Superconducting strings, in addition to the above effects, emit electromagnetic radiation that can potentially be detected as radio bursts. At present, the strongest bounds on glaxosmithkline wuhan string tension come from constraints on the stochastic gravitational wave background from pulsar timing measurements and time apps LIGO interferometer.

However, these bounds are sensitive to the details of the string network evolution. On the other hand, bounds from CMB are weaker but also less model-dependent. Different types of cosmic string signatures and their current time apps are reviewed below. Cosmic string networks persist throughout the history of the universe and actively source metric perturbations at all times.

Prior to cosmic recombination, density and velocity perturbations of baryon-photon fluid are produced in the wakes of moving cosmic strings, which then remain imprinted on the surface of last scattering. Both, wakes and the KSG effect, are induced by the deficit angle in the metric around a string. In addition, matter particles experience gravitational attraction to the string if it is not perfectly straight.

The spacetime around a straight cosmic string is locally flat, but globally conical, with a deficit angle determined by the string tension. Several groups have tried searching for such line-like features in the existing CMB maps and to forecast the prospects for future observations. Detectable sharp edges can be present not only in CMB temperature maps, but also in polarization maps.

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