#### Filter Results:

- Full text PDF available (29)

#### Publication Year

1996

2017

- This year (1)
- Last 5 years (9)
- Last 10 years (13)

#### Publication Type

#### Co-author

#### Journals and Conferences

#### Key Phrases

Learn More

- P P Avelino, D Bazeia, L Losano, J Menezes, B F Oliveira
- Physical review. E, Statistical, nonlinear, and…
- 2012

We investigate the population dynamics in generalized rock-paper-scissors models with an arbitrary number of species N. We show that spiral patterns with N arms may develop both for odd and even N, in particular in models where a bidirectional predation interaction of equal strength between all species is modified to include one N-cyclic predator-prey rule.… (More)

- P P Avelino, D Bazeia, L Losano, J Menezes, B F de Oliveira
- Physical review. E, Statistical, nonlinear, and…
- 2014

In this work we investigate the development of stable dynamical structures along interfaces separating domains belonging to enemy partnerships in the context of cyclic predator-prey models with an even number of species N≥8. We use both stochastic and field theory simulations in one and two spatial dimensions, as well as analytical arguments, to describe… (More)

- P P Avelino, D Bazeia, L Losano, J Menezes
- Physical review. E, Statistical, nonlinear, and…
- 2012

We introduce a family of rock-paper-scissors-type models with Z(N) symmetry (N is the number of species), and we show that it has a very rich structure with many completely different phases. We study realizations that lead to the formation of domains, where individuals of one or more species coexist, separated by interfaces whose (average) dynamics is… (More)

We investigate the dependence of the epoch of reionization on the properties of cosmological perturbations, in the context of cosmologies permitted by WMAP. We compute the redshift of reionization using a simple model based on the Press–Schechter approximation. For a power-law initial spectrum we estimate that reionization is likely to occur at a redshift… (More)

P.P. Avelino, 2 D. Bazeia, L. Losano, 4, 3 J. Menezes, 4, 5 and B. F. Oliveira Centro de Astrof́ısica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal Departamento de F́ısica e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal Departamento de F́ısica, Universidade Federal da… (More)

P. P. Avelino,1 E. P. S. Shellard,2 J. H. P. Wu,2 and B. Allen3 1Centro de Astrofisica, Universidade do Porto, Rua do Campo Alegre 823, 4150 Porto, Portugal 2Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, United Kingdom 3University of Wisconsin, Milwaukee, Wisconsin 53201 (Received 8… (More)

We discuss constraints on so-called ‘varying speed of light theories’ coming from the physics of the early universe. Specifically, we consider the position of the first acoustic peak of the CMB angular power spectrum, showing that the recent determination of its position by various CMB experiments, in particular BOOMERanG/NA, can be used to constrain the… (More)

- P. P. Avelino, B. Allen
- 1998

We investigate the contribution made by small loops from a cosmic string network as seeds for large-scale structure formation. We show that cosmic string loops are highly correlated with the long-string network on large scales and therefore contribute significantly to the power spectrum of density perturbations if the average loop lifetime is comparable to… (More)

We study the cosmological evolution of domain wall networks in two and three spatial dimensions in the radiation and matter eras using a large number of highresolution field theory simulations with a large dynamical range. We investigate the dependence of the uncertainty in key parameters characterising the evolution of the network on the size, dynamical… (More)

We consider the possibility that current hints of spatial variations of the fine structure constant at high redshift, based on VLT/UVES and Keck/HIRES observations, could be caused by a biased domain wall network described by a scalar field non-minimally coupled to the electromagnetic field. We show that in order to be responsible for the reported spatial… (More)