Abstract: In this talk, she will discuss various phenomenological and cosmological models motivated by string theory. In the first half of her talk, she will present an inflationary model where the masses of the scalar fields (inflatons) are heavier than the underlying Hubble parameter. Contrary to the standard lore, these heavy inflatons can evade both the η-problem and the swampland conjectures with the help of a large turning rate. She will show this in an explicit model of D5-brane inflation where the brane moves along one angular and radial direction in the internal space. For the second part, she will focus on a new metastable-dS solution within the four-dimensional effective field theory, after compactifying on a weakly warped deformed conifold where the warping that couples the conifold and volume modulus is subdominant. The construction can be studied for explicit construction of dynamical dark energy also known as models of quintessence
Speaker Bio:Dibya is a postdoctoral scholar in the Department of Physics, Ashoka University, working in the area of theoretical cosmology. In particular, her past and current works focus on various cosmological models (dS, inflation, dark energy, quintessence), moduli stabilization in string theory, braneworld models, and their gravitational signatures. She received her PhD from the University of Guanajuato, Mexico last year and did her first postdoc at the University of Puebla.