Speaker
Description
Our Universe is spatially homogeneous and isotropic on large scales. This high symmetry of the Universe enables us to systematically investigate various possibilities of cosmological scenarios using the powerful tool from high-energy physics, namely, effective field theory (EFT). In this approach, the difference in field contents is translated into the difference in symmetry-breaking patterns, encapsulating phenomenological features of each scenario into effective operators in a model-independent manner. In this talk, starting with a brief review of the so-called EFT of inflation/dark energy, I will talk about how we can extend this framework to different phenomena of cosmology, such as vector dark energy, interacting dark matter and dark energy, and chiral gravitational waves.