Current status of statistical mechanics in Armenia Armen Allahverdyan (Yerevan Physics Institute) -- Introduction: subject of statistical mechanics --

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Presentation transcript:

Current status of statistical mechanics in Armenia Armen Allahverdyan (Yerevan Physics Institute) -- Introduction: subject of statistical mechanics -- Stat mech/thermodynamics of (small) engines -- Interdisciplinary stat mech: evolution theory -- Biological stat mech: presentation by E. Mamasakhlisov

Statistical mechanics: Explain macroscopic (many-body) regularities from microscopic concepts Predict new macroscopic effects Tools: classical or quantum mechanics + probability theory and statistics Statistical physics in Yerevan Physics Institute : 4 groups Method of presentation: focus on 1 important scientific questions for each subject Drawbacks: no focus on answers; activities are not fully covered Experiments: engineering thermodynamics, cond-mat, biophysics

1. Statistical mechanics of (small) heat engines A. Allahverdyan (YerPhi), K. Hovhannisyan (former PhD in YerPhi, now postdoc in Barcelona) W. Deng (PhD student, France) Support: Volkswagenstiftung ( ), NSF-USA ( ) DARPA (2012-…) RRS-(Pays de la Loire, France) ( ) PCR (China) Academy of Sciences ( ) (to W. Deng) SC-Armenia (2011) (to K. Hovhannisyan ) Frequent structure of theoretical physics working group in Armenia : 1 researcher + PhD student(s) + western-eastern collaborators

Cyclic engine Work-source Hot bath Cold bath Work: Power: Efficiency: output / input Principal scheme of a (external combustion) heat engine

First law: Second law: Carnot (maximal) efficiency Efficiency-power dilemma: power goes to zero whenever Question: how to make engines both powerful and efficient Laws of thermodynamics Gasoline car: %, Diesel: %

Allahverdyan et al, 2005—2013 Physical Review E, A Physical Review Letters, Physics Reports Answer: study engines from within stat mech; microscopic origins of the power-efficiency dilemma (weak law) Experimentally motivated activity with YerPhi biophysics group by S. Gevorkian Explaining micromechanical/thermal experiments on bio-engines (haemoglobin) Gevorkian, Allahverdyan et al, Physical Review Letters 2009, Europhysics Letters 2009, 2011

2. Statistical mechanics of evolution theory D. Saakian (YerPhi), Z. Kirakossyan (PhD in YerPhi) CRDF ( ), NSF-Taiwan (2008-….) DARPA (2011-…)

Statistical mechanics explaining virus evolution theory Specific points of virus evolution High mutation rates  the unit of evolution is a group of connected genes Asexual reproduction, but with horizontal gene transfer: connected population, many-body problem  statistical mechanics is necessary Accurate experimental realizations

Question: microscopic theory of virus evolution for a finite population of viruses Answer : extract dynamical behaviour from the existing models (quasi-species model). Construct new models. Saakian et al, 2005—2012 PNAS (USA), Physical Review E

Conclusion Reviewed activity of 2 groups doing theoretical statistical mechanics at Yerevan Physics Institute Third group doing statistical mechanics at YerPhi is led by Prof. N. Ananikian. Biologically motivated statistical physics  talk by Prof. Mamasakhlisov More stat-phys, talk by Vadim Ohanyan tomorrow