In particular, I'm interested in a possible way of extracting some basic, fundamental aspects of physics from observations: 

1. Gravitational Positivity bounds

I'm trying to understand how the information of UV complete quantum gravity is imprinted on its low-energy effective theory, in light of S-matrix positivity bounds in the presence of gravity. 

Formulation of gravitatational positivity bounds is challenging, and still in progress in the literatures. We proposed a formulation based on the gravitational Regge behavior and the Finite Energy Sum Rules for it (arXiv:[hep-th]2007.15009, arXiv:[hep-th]2212.08001).

Complementary to the formulation study,  I've been also investigating phenomenological implications for the Standard Model(arXiv:[hep-th]2104.09682), scalar potential(arXiv:[hep-th]2105.01436), and the dark sector physics(arXiv:[hep-th]2205.12835, arXiv:[hep-th]2305.10058). 

These works connect low-energy physics with UV quantum gravity. However, I should emphasize that the current knowledge of properties of gravitational UV amplitude is not enough to obtain interesting Swampland conditions on EFTs.  Futher studies of UV amplitude must be crucial.


2. Infrared secular effects, Stochastic inflation

I'm working on the infrared secular effects during inflation, and some related topics such as stochastic inflation.

3. Detection of gravitons 

One of the final goal is to find a realistic setup to test if the quantized gravitons really exist.