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Scott Melville:
Signs of quantum gravity at low energies: an Effective Field Theory approach
One of the greatest barriers to understanding quantum gravity is that its characteristic (Planck) energy scale is well beyond our experimental reach. Instead, we can only access a low-energy regime in which essentially all quantum gravity approaches must reduce to General Relativity (/Standard Model) plus small corrections.
In this talk, I will describe how to connect these (observable!) low-energy corrections to concrete properties of the underlying quantum gravity theory, and in particular how "positivity bounds" on effective field theory scattering amplitudes can be used to diagnose whether the high-energy completion is unitary, causal and local. As an example, I will show how observations of dark energy fluctuations on cosmological scales and the low-energy speed of gravitational waves can be used to distinguish between different kinds of quantum gravity.
Irene Valenzuela:
Consistency with quantum gravity can impose non-trivial constraints at low energies, even if the Planck scale is at very high energy. The Swampland program aims to determine the constraints that an effective ?field theory must satisfy to be consistent with a UV embedding in a quantum gravity theory. This has led to new quantum gravity constraints, motivated by black hole physics and string theory, that can be used as new guiding principles to construct beyond standard models of Particle Physics and Cosmology. They might also provide the missing piece to solve the long-standing naturalness issues observed in our universe. In this talk, I will review the most important Swampland conjectures and recent developments regarding their connections and phenomenological implications.
Zoom info:
https://uni-jena-de.zoom.us/j/69556470634
Meeting ID: 695 5647 0634
Passcode: QG-AA