Speaker: Bijay Kumar Agarwalla (Indian Institute of Science Education and Research)

Date: Aug. 16th (Mon.) 17:00 (Jpn time)-

Title: Bounds on fluctuations in thermal machines and its connection to thermodynamic uncertainty relation.

Abstract: Trade-off relations involving the relative uncertainty of currents and the associated entropy production have been of enormous interest in the last few years in the field of non-equilibrium stochastic thermodynamics. It is now realized, for example, that the optimization of heat engines should balance power, efficiency as well as power fluctuations. In this talk, I will talk about multi-affinity driven continuous thermal machines and show that the the relative fluctuations of individual currents for thermal machines are not independent but follow strict bounds, giving rise to a new bound for the mean efficiency of thermal machines. I will also talk about the extension of this bound for finite-time Otto cycles and autonomous quantum absorption refrigerators.

References:

1. Bounds on fluctuations for finite-time quantum Otto cycle, S. Saryal and Bijay Agarawalla, Phys. Rev. E. Lett 103 L060103 (2021)

2. Universal bounds on Fluctuations in continuous thermal machines, S. Saryal et al arXiv:2103.13513

3. Universal bounds on cooling power and cooling efficiency for autonomous absorption refrigerators S. Mohanta et al. arXiv. 2106.12809

4. Papers related thermodynamic uncertainty relations: Phys. Rev. Research (Rapid Communication) 2, 022044 (2020), Phys. Rev. E 100, 042101 (2019), Phys. Rev. B 98, 155438 (2018).