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This Week at Physics

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Events on Tuesday, November 20th, 2018

Theory Seminar (High Energy/Cosmology)
Deriving the WGC from holographic entanglement entropy
Time: 11:00 am
Place: 5310 Chamberlin Hall
Speaker: Miguel Montero, KU Leuven
Abstract: The Weak Gravity Conjecture (WGC) is a proposed constraint on effective field theories that can be consistently coupled to quantum gravity, requiring the presence of superextremal particles. This particles allow extremal black holes to decay, but so far the relationship has only been understood heuristically. I will explain how this connection can be made precise, in the context of asymptotically AdS quantum gravity: The black hole must be allowed to decay to comply with quantum information theorems in the dual CFT. I will discuss the connection to the ER=EPR proposal and how this avenue can lead to new Swampland constraints.
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Chaos & Complex Systems Seminar
Ergodicity in chaotic oscillators
Time: 12:05 pm
Place: 4274 Chamberlin (Refreshments will be served)
Speaker: Clint Sprott, UW Department of Physics
Abstract: The harmonic oscillator is the simplest and most common nontrivial dynamical system. The prototypical mechanical example is a mass suspended by a spring, but the same dynamics occur in most musical instruments, many electronic devices, models of economic and ecological systems, some chemical reactions, and many other real-world systems. However, most oscillations in nature are not simple but rather exhibit aperiodic fluctuations such as the weather and the stock market. I will describe a new model of a chaotic oscillator whose behavior is identical to a harmonic oscillator in equilibrium with a source of heat at a constant temperature. It represents the culmination of a 30-year search for an elegant chaotic model whose solution is ergodic and whose variables accurately exhibit a normal (Gaussian) distribution as expected for a truly random process.
Host: Clint Sprott
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