# Relevant Operators of Particle Physics and Cosmology

**Apr 5, 2019 at 10:00 AM - 11:30 AM**

Room 208 Physics Bldg.

Although the Standard Model of Particle Physics can reproduce the results of all the experiments performed to this date, it can only be an effective theory of fundamental physics. However, treating the Standard Model this way brings its own set of challenges; namely, the coefficients of relevant operators become extremely sensitive to UV physics. The relevant operator of the Standard Model is the Higgs mass which causes the "hierarchy problem", while the cosmological constant term of cosmology results in the "cosmological constant problem". In this thesis defense, I will talk about how these issues can guide us in the pursuit of searching for new physics, both from a model building perspective and from a phenomenological perspective. In the first part, I will present a Higgs model on a five-dimensional Anti-de-Sitter space which attempts to make the Higgs criticality a dynamical attractor of the theory, thereby eliminating the sensitivity to the UV parameters. In the second part, I will talk about how we can gain some insights about the cosmological constant problem from the observations of binary neutron star mergers.

**Cem Eroncel, ** Syracuse University

Advisor: Prof. Jay Hubisz, Contact: Yudaisy Salomon Sargenton - phyadmin@syr.edu