Workshop on Gravitational Waves, Cosmology and Fundamental Physics

Contrary to what it is typically done in the literature, we re-formulate the δN formalism by using the e-folding number n counted forward in time. Taking advantage of the complete (anti-)correlation of the initial field perturbation δϕ0 with its conjugate momenta δπ0, we find a simple formula to calculate the non-linear curvature perturbation as well as its PDF by using the δN method...

The polarized light of the cosmic microwave background is sensitive to new physics that violates parity symmetry. In this presentation, we present a tantalizing hint of parity violation from the polarization data of two satellite missions, WMAP and Planck, with a statistical significance of 3 sigma. This signal has also been observed in recent data from the Atacama Cosmology Telescope. Taken...

It is not easy to have a healthy parity violating gravity models within Riemannian geometry. The famous Chern-Simons modified general relativity and its extensions are pathological due to the ghost modes appeared at high energy scales. In this talk, I will introduce some parity violating models within the framework of teleparallel gravity, especially the Nieh-Yan modified teleparallel gravity...

In this presentation, I will talk about a framework for analysing gravitational waves in thermal environments, such as the radiation-dominant early universe, from a symmetry perspective. I will focus on the effective dynamics of gravitational waves in the interaction picture of quantum field theory and discuss the symmetry constraints on the theory.