Gravitating Semilocal strings (2009)
Hartmann, Betti, Urrestilla, Jon
We discuss the properties of semilocal strings minimally coupled to gravity. Semilocal strings are solutions of the bosonic sector of the Standard Model in the limit $\sin^2\theta_W=1$ (where...
Observing the Evolution of the Universe (2009)
Aguirre, James, Amblard, Alexandre, Ashoorioon, Amjad, Baccigalupi, Carlo, Balbi, Amedeo, Bartlett, James, ...
How did the universe evolve? The fine angular scale (l>1000) temperature and polarization anisotropies in the CMB are a Rosetta stone for understanding the evolution of the universe. Through detailed...
Gravitating (field theoretical) cosmic (p,q)-superstrings (2008)
Hartmann, Betti, Urrestilla, Jon
We study field theoretical models for cosmic (p,q)-superstrings in a curved space-time. We discuss both string solutions, i.e. solutions with a conical deficit, but also so-called Melvin solutions,...
Urrestilla, Jon, Mukherjee, Pia, Liddle, Andrew R., Bevis, Neil, Hindmarsh, Mark, Kunz, Martin
While observations indicate that the predominant source of cosmic inhomogeneities are adiabatic perturbations, there are a variety of candidates to provide auxiliary trace effects, including...
Evolution of cosmic superstring networks: a numerical simulation (2007)
Urrestilla, Jon, Vilenkin, Alexander
We study the formation and evolution of an interconnected string network in large-scale field-theory numerical simulations, both in flat spacetime and in expanding universe. The network consists of...
Cosmic microwave anisotropies from BPS semilocal strings (2007)
Urrestilla, Jon, Bevis, Neil, Hindmarsh, Mark, Kunz, Martin, Liddle, Andrew R.
We present the first ever calculation of cosmic microwave background CMB anisotropy power spectra from semilocal cosmic strings, obtained via simulations of a classical field theory. Semilocal...
CMB polarization power spectra contributions from a network of cosmic strings (2007)
Bevis, Neil, Hindmarsh, Mark, Kunz, Martin, Urrestilla, Jon
We present the first calculation of the possible (local) cosmic string contribution to the cosmic microwave background polarization spectra from simulations of a string network (rather than a...
Fitting CMB data with cosmic strings and inflation (2007)
Bevis, Neil, Hindmarsh, Mark, Kunz, Martin, Urrestilla, Jon
We perform a multiparameter likelihood analysis to compare measurements of the cosmic microwave background (CMB) power spectra with predictions from models involving cosmic strings. Adding strings to...
Bevis, Neil, Hindmarsh, Mark, Kunz, Martin, Urrestilla, Jon
We present the first field-theoretic calculations of the contribution made by cosmic strings to the temperature power spectrum of the cosmic microwave background (CMB). Unlike previous work, in which...
The effects of inhomogeneities on the cosmology of type IIB conifold transitions (2005)
Palti, Eran, Saffin, Paul, Urrestilla, Jon
In this paper we examine the evolution of the effective field theory describing a conifold transition in type IIB string theory. Previous studies have considered such dynamics starting from the...
Exotic composites: the decay of deficit angles in global-local monopoles (2005)
Achucarro, Ana, Hartmann, Betti, Urrestilla, Jon
We study static, spherically symmetric, composite global-local monopoles with a direct interaction term between the two sectors in the regime where the interaction potential is large. At some...
The evolution and persistence of dumbbells (2001)
Urrestilla, Jon, Achucarro, Ana, Borrill, Julian, Liddle, Andrew R.
We use large-scale numerical simulations to study the formation and evolution of non-topological defects in a generalized electroweak phase transition described by the Glashow-Salam-Weinberg model...
The (in)stability of global monopoles revisited (2000)
Achucarro, Ana, Urrestilla, Jon
We analyse the stability of global O(3) monopoles in the infinite cut-off (or scalar mass) limit. We obtain the perturbation equations and prove that the spherically symmetric solution is classically...