Abstract Details
| Name: Manvendra Rajvanshi Affiliation: IISER, Mohali Conference ID: ASI2019_330 Title : Comparative study of nonlinear spherical perturbations in quintessence vs tachyon field dark energy models. Authors and Co-Authors : Manvendra Pratap Rajvanshi, J.S. Bagla Abstract Type : Poster Abstract Category : General Relativity and Cosmology Abstract : A number of theoretical models have been proposed for Dark Energy ranging from the Cosmological constant to dynamic scalar fields. A big question is distinguishing between these models, first in theoretical terms which can lead to observational implications. It has been shown that any model of dark energy can be tuned to produce the same expansion history. In this work, we look at the question: how two different dark energy models; tachyonic field and scalar quintessence dark energy affect the dynamics of nonlinear perturbations. We first construct potentials for the two theories so as to get exactly same background evolution and then study nonlinear perturbations with the restriction of spherical symmetry. We find that the differences are weak for models which are closer to the cosmological constant. |