Abstract Details
| Name: Avinash Singh Affiliation: IISER, Mohali Conference ID: ASI2019_313 Title : Growth of Structure in the Presence of Perturbed Tachyon Dark Energy Authors and Co-Authors : Avinash Singh and H. K. Jassal Abstract Type : Oral Abstract Category : General Relativity and Cosmology Abstract : Non-canonical scalar field models, one of which is known as the tachyon dark energy model, are a viable candidate for dark energy. We study tachyon dark energy model as an alternative to the Lambda-CDM model. Not only this model is capable of explaining present-day accelerated expansion it is able to alleviate the fine-tuning problem which Lambda-CDM model suffer from. We use two different potentials, inverse square potential and exponential potential, to find the constraints on the parameters of this model in light of new data sets and find that this model is compatible with latest cosmological observations (e.g. Planck-2015). We also study perturbations in tachyon dark energy. We find that dark energy perturbation although less significant at smaller scales, it becomes significant at Hubble and super-Hubble scales. We study the growth of structure when tachyon dark energy work as smooth background as well as when it allowed to be perturbed. We also investigate the integrated Sachs-Wolfe effect and compare it with other models. With respect to the Lambda-CDM model, the thawing tachyon model does not deviate much but the freezing model shows significant deviations. |