We show that all three conditions for the cosmological relevance of heterotic cosmic strings, the right tension, stability and a production mechanism at the end of inflation, can be met in the strongly coupled M-theory regime. Whereas cosmic strings generated from weakly coupled heterotic strings have the well known problems posed by Witten in 1985, we show that strings arising from M5-branes w...

Distributional sources of cosmic walls crossed by cosmic strings from Riemann-Cartan (RC) Geometry. The matter density of the planar wall is maximum at the point where the cosmic string crosses the cosmic wall. Cartan torsion is has a support on the cosmic string given by the Dirac δ-function. Off the sources are left with a torsionless vacuum. PACS number(s) : 0420,0450,1127 Departamento de F́ı...

We study the formation of D and F -cosmic strings in D-brane annihilation after brane inflation. We show that D-string formation by quantum de Sitter fluctuations is severely suppressed, due to suppression of RR field fluctuations in compact dimensions. We discuss the resonant mechanism of production of D and F -strings, which are formed as magnetic and electric flux tubes of the two orthogonal...

Abstract Particle emission, in addition to gravitational radiation from cosmic string loops, affects the resulting loop distribution and hence corresponding observational consequences of strings. Here we focus on two models which loops length ? are produced infinite network with a given power-law. For both find that, due particle production, Stochastic Gravitational Wave Background (SGWB) is cu...