Deviation from ACDM with cosmic strings networks

In this work, we consider a network of cosmic strings to explain a possible deviation from ACDM behaviour. We use different observational data to constrain the model and show that a small but non-zero contribution from the string network is allowed by the observational data, which can result in a reasonable departure from ACDM evolution. But by calculating the Bayesian evidence, we show that the present data still strongly favour the concordance ACDM model irrespective of the choice of the prior.