Events in Physics
Frank Pinski, Cincinnati
Theory of Fluctuations in a Thermodynamic System and the Limitations of the Onsager-Machlup Functional
The aim of this work is to describe diffusion-like paths that are explored by a particle moving in a potential while being in thermal equilibrium with its surroundings. To do this, we examine functionals that are similar to the Onsager-Machlup functional. The difference is that they are based on Hamiltonian or Hybrid Monte Carlo methods (HMC) instead of Brownian dynamics.
Then we focus our attention to the "double-ended" problem, where the Onsager-Machlup functional is interpreted as a "thermodynamic action" and is used to define a measure, which in turn can be employed to sample paths that are constrained to start and end at predetermined points
Even in simple systems, we find that the paths generated by sampling this measure are not consistent with the Boltzmann distribution. By using the new perspective described in the first part of the talk, I will identify why this is so.
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UKRI Deadlines
Due to the implementation of a new UKRI funding system (TFS) there will be a fixed quarterly deadlines for some grants which would previously have been on open calls, this is to allow necessary system amendments and updates.
The first deadline after implementation will be 28th September 2023 and applies to those calls listed below:
EPSRC Post Doctoral Fellowship
EPSRC Working with overseas scientists