Scale separation, how (not)?

Abstract: The existence of a separation of scales between the four observed spacetime dimensions and the yet unobserved additional ones is a minimal requirement for (string) phenomenology. However, explaining the origin of this property remains an open problem. In this talk, I will explore both sides of this issue. First, I will present general bottom-up arguments suggesting that scale separation is challenging to achieve, if not impossible, in broad classes of models. Then, I will discuss top-down constructions offering potential avenues for scale separation. In either direction, this will demonstrate how, among all the hierarchies in nature, scale separation is one for which concrete progress may be within reach.

condensed mattergeneral relativity and quantum cosmologyHEP - latticeHEP - theorymathematical physicsquantum physics

Audience: researchers in the topic

Quantum Theories of Fields, Matter, and Strings

Series comments: A series of talks covering a broad range of topics in theoretical physics, including high energy theory, condensed matter, and string theory.

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