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14 papers · 2 filters
Field theory simulation of Abelian-Higgs cosmic string cusps
Ken D. Olum, J. J. Blanco-Pillado
We have performed a lattice field theory simulation of cusps in Abelian-Higgs cosmic strings. The results are in accord with the theory that the portion of the strings which overla…
The quantum cosmology debate
Alexander Vilenkin
I review the tunneling, Hartle-Hawking and Linde proposals for the wave function of the universe and comment on the recent work on quantum creation of open universes.
Fully Anisotropic String Cosmologies, Maxwell Fields and Primordial Shear
Massimo Giovannini
We present a class of exact cosmological solutions of the low energy string effective action in the presence of a homogeneous magnetic fields. We discuss the physical properties of…
Gravitational field of vacuumless defects
Inyong Cho, Alexander Vilenkin
It has been recently shown that topological defects can arise in symmetry breaking models where the scalar field potential has no minima and is a monotonically decreasing fu…
The form of cosmic string cusps
J. J. Blanco-Pillado, Ken D. Olum
We classify the possible shapes of cosmic string cusps and how they transform under Lorentz boosts. A generic cusp can be brought into a form in which the motion of the cusp tip li…
Magnetic Knots as The origin of Spikes in the Gravitational Waves Backgrounds
Massimo Giovannini
The dynamical symmetries of hot and electrically neutral plasmas in a highly conducting medium suggest that, after the epoch of the electron-positron annihilation, magnetohydrodyna…