1k citations · 2.5k across the 16 of their papers we have counts for
17 papers
Models for Small-Scale Structure on Cosmic Strings: II. Scaling and its stability
J. P. P. Vieira, C. J. A. P. Martins, E. P. S. Shellard
We make use of the formalism described in a previous paper [Martins {\it et al.} Phys. Rev. D90 (2014) 043518] to address general features of wiggly cosmic string evolution. In par…
Cosmology and Fundamental Physics with the Euclid Satellite
Luca Amendola, Stephen Appleby, Anastasios Avgoustidis +69
Euclid is a European Space Agency medium class mission selected for launch in 2020 within the Cosmic Vision 2015 2025 program. The main goal of Euclid is to understand the origin o…
Contribution of domain wall networks to the CMB power spectrum
A. Lazanu, C. J. A. P. Martins, E. P. S. Shellard
We use three domain wall simulations from the radiation era to the late time dark energy domination era based on the PRS algorithm to calculate the energy-momentum tensor component…
Models for Small-Scale Structure on Cosmic Strings: I. Mathematical Formalism
C. J. A. P. Martins, E. P. S. Shellard, J. P. P. Vieira
We describe the formalism of a quantitative analytic model for the evolution of realistic wiggly (as opposed to Goto-Nambu) cosmic strings. The model is particularly suited for des…
Cosmology and fundamental physics with the Euclid satellite
Luca Amendola, Stephen Appleby, David Bacon +60
Euclid is a European Space Agency medium class mission selected for launch in 2019 within the Cosmic Vision 2015-2025 programme. The main goal of Euclid is to understand the origin…
Dark matter from cosmic defects on galactic scales?
N. Guerreiro, P. P. Avelino, J. P. M. de Carvalho +1
We discuss the possible dynamical role of extended cosmic defects on galactic scales, specifically focusing on the possibility that they may provide the dark matter suggested by th…
Topological Defects in Contracting Universes
P. P. Avelino, C. J. A. P. Martins, C. Santos +1
We study the behaviour and consequences of cosmic string networks in contracting universes. They approximately behave during the collapse phase as a radiation fluids. Scaling solut…
Cosmic Numbers: A Physical Classification for Cosmological Models
P. P. Avelino, C. J. A. P. Martins
We introduce the notion of the cosmic numbers of a cosmological model, and discuss how they can be used to naturally classify models according to their ability to solve some of the…
Alternatives to Quintessence Model Building
P. P. Avelino, L. M. G. Beca, J. P. M. de Carvalho +2
We discuss the issue of toy model building for the dark energy component of the universe. Specifically, we consider two generic toy models recently proposed as alternatives to quin…
Topological defects: A problem for cyclic universes?
P. P. Avelino, C. J. A. P. Martins, C. Santos +1
We study the behaviour of cosmic string networks in contracting universes, and discuss some of their possible consequences. We note that there is a fundamental time asymmetry betwe…
Modified Median Statistics and Type Ia Supernova Data
P. P. Avelino, C. J. A. P. Martins, P. Pinto
The median statistic has recently been discussed by Gott \textit{et al.} as a more reliable alternative to the standard likelihood analysis, in the sense of requiring fewer a…
Can our Universe be inhomogeneous on large sub-horizon scales ?
P. P. Avelino, J. P. M. de Carvalho, C. J. A. P. Martins +1
We show that our Universe may be inhomogeneous on large sub-horizon scales without us being able to realise it. We assume that a network of domain walls permeates the universe divi…
Extending the Velocity-dependent One-scale String Evolution Model
C. J. A. P. Martins, E. P. S. Shellard
We provide a general overview of the velocity-dependent one-scale model for cosmic string evolution and discuss two further extensions to it. We introduce and justify a new ansatz…
Topological defects: fossils of an anisotropic era?
P. P. Avelino, C. J. A. P. Martins
We consider the evolution of domain walls produced during an anisotropic phase in the very early universe, showing that the resulting network can be very anisotropic. If the domain…
Evolution of Superconducting String Currents
C. J. A. P. Martins, E. P. S. Shellard
We extend the quantititative string evolution model of Martins and Shellard to superconducting strings by introducing a simple toy model for the evolution of the currents. This is…
Galactic Magnetic Fields from Superconducting Strings
C. J. A. P. Martins, E. P. S. Shellard
We use a simple analytic model for the evolution of currents in superconducting strings to estimate the strength of the `seed' magnetic fields generated by these strings. This mode…
String Evolution with Friction
C. J. A. P. Martins, E. P. S. Shellard
We study the effects of friction on the scaling evolution of string networks in condensed matter and cosmological contexts. We derive a generalized `one-scale' model with the strin…