Dr ANASTASIOS AVGOUSTIDIS's Outputs (4)

Stretching and Kibble scaling regimes for Hubble-damped defect networks (2016)
Journal Article
Martins, C., Rybak, I. Y., Avgoustidis, A., & Shellard, E. (2016). Stretching and Kibble scaling regimes for Hubble-damped defect networks. Physical Review D, 94(11), Article 116017. https://doi.org/10.1103/PhysRevD.94.116017

The cosmological evolution of topological defect networks can broadly be divided into two stages. At early times they are friction dominated due to particle scattering and therefore nonrelativistic and may either be conformally stretched or evolve in... Read More about Stretching and Kibble scaling regimes for Hubble-damped defect networks.

CMB constraints on cosmic strings and superstrings (2016)
Journal Article
Charnock, T., Avgoustidis, A., Copeland, E. J., & Moss, A. (2016). CMB constraints on cosmic strings and superstrings. Physical Review D - Particles, Fields, Gravitation and Cosmology, 93(12), Article 123503. https://doi.org/10.1103/PhysRevD.93.123503

We present the first complete MCMC analysis of cosmological models with evolving cosmic (super)string networks, using the Unconnected Segment Model in the unequal-time correlator formalism. For ordinary cosmic string networks, we derive joint constra... Read More about CMB constraints on cosmic strings and superstrings.

Extending the velocity-dependent one-scale model for domain walls (2016)
Journal Article
Martins, C., Rybak, I. Y., Avgoustidis, A., & Shellard, E. (2016). Extending the velocity-dependent one-scale model for domain walls. Physical Review D - Particles, Fields, Gravitation and Cosmology, 93(4), Article 043534. https://doi.org/10.1103/PhysRevD.93.043534

We report on an extensive study of the evolution of domain wall networks in Friedmann-Lemaˆıtre- Robertson-Walker universes by means of the largest currently available field-theory simulations. These simulations were done in 40963 boxes and for a ran... Read More about Extending the velocity-dependent one-scale model for domain walls.

Sub-percent constraints on cosmological temperature evolution (2016)
Journal Article
Avgoustidis, A., Genova-Santos, R. .., Luzzi, G., & Martins, C. (2016). Sub-percent constraints on cosmological temperature evolution. Physical Review D - Particles, Fields, Gravitation and Cosmology, 93(4), Article 043521. https://doi.org/10.1103/PhysRevD.93.043521

The redshift dependence of the cosmic microwave background temperature is one of the key cosmological observables. In the standard cosmological model one has T (z) = T0(1 + z), where T0 is the present-day temperature. Deviations from this behavior wo... Read More about Sub-percent constraints on cosmological temperature evolution.