Primordial adiabatic fluctuations from cosmic defects
In the context of "two-metric" theories of gravity there is the possibility that cosmic defects will produce a spectrum of primordial adiabatic density perturbations, when the speed characterizing the defect-producing scalar field is much larger than the speed characterizing gravity and standard model particles. This model will exactly mimic the standard predictions of inflationary models, with the exception of a small non-Gaussian signal which could be detected by future experiments.
Avelino
PP
Centro de Astrofisica, Universidade do Porto, Rua das Estrelas s/n, 4150-762 Porto, Portugal and Departamento de Fisica da Faculdade de Ciencias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal.
Martins
CJ