title: Primordial adiabatic fluctuations from cosmic defects
abstract: 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.
authors.affiliation: 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.
authors.initials: PP
authors.lastname: Avelino
authors.initials: CJ
authors.lastname: Martins