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Coarse graining in spin foams - overview and new developments

Jan 27
Group Seminar
2:00 pm o'clock to 3:30 pm o'clock
Sebastian Steinhaus (Universität Jena, Germany)

While spin foam models are a promising candidate for a theory of quantum gravity, they face several key challenges. In this talk, I explain the idea behind renormalization / coarse graining in spin foams, how it helps us address these challenges and eventually turn spin foam models into a computational formalism.
In more detail, I will discuss two numerical strategies to perform coarse graining, namely tensor network renormalization and a restricted semi-classical path integrals, where the latter is a drastically simplified model to explore the 4D case. For each method, I will highlight the latest developments and key lessons we can draw from them.