Quantum gravity constraints on effective field theories via string theory and holography

One of the most outstanding problems in theoretical physics is finding the correct theory of quantum gravity. There are several proposals, among which string theory features prominently. However, the fact that gravity is such a weak force means that any quantum-gravitational effects take place at energies far above our current technical capabilities.
Recently, however, it has been realized that there is a subtle way in which quantum gravity may affect low-energy physics, in the form of constraints on the properties of elementary particles and their interactions. Low-energy theories which do not satisfy these constraints are said to be in the ``Swampland’’. This paradigm has the potential to lead to experimentally verifiable predictions, particularly in cosmology. However, many of the constraints have not been proven rigorously, and remain conjectures with very strong theoretical support.
My proposal will explore this field from two points of view: by discovering new Swampland constraints coming from string theory, and by putting the known ones in as rigorous a footing as we can. For this, I will use a variety of tools ranging from top-down string compactifications to quantum information and holography.