Contrasting measures of irreversibility in stochastic and deterministic dynamics
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1 Contrasting measures of irreversibility in stochastic and deterministic dynamics Ian Ford Department of Physics and Astronomy and London Centre for Nanotechnology UCL I J Ford, New J. Phys 17 (2015)
2 The message How to measure irreversibility? For stochastic dynamics: stochastic entropy production measures reversibility For deterministic dynamics: Evans-Searles dissipation function But this assumes a velocity-symmetric pdf A modified dissipation function can be defined [Ford (2015)] dissipation production measures obversibility Examples in classical and quantum dynamics
3 T M 2 M T 1
4 ' T M 2 M T 1
5 ' T M ' M T 1
6 antitrajectory trajectory ' M T ' 2 M T
7 position position Definition of stochastic entropy production s tot[ x( t)] ln prob[trajectory x( t), v( t)] R R prob[antitrajectory x ( t), v ( t)] Sekimoto, Seifert, etc x(t) x R (t) time time
8 Reversibility measure Transition probabilities
9 Reversibility measure Transition probabilities
10 Deterministic dynamics NOISE Newton s equations / Schrödinger equation Possibly with a deterministic thermal constraint How might we measure irreversibility? stochastic entropy production is zero
11 In deterministic dynamics reversibility is automatic ' M T ' 2 M T
12 Definition of stochastic entropy production s tot[ x( t)] ln prob[trajectory x( t), v( t)] R R prob[antitrajectory x ( t), v ( t)] Sekimoto, Seifert, etc
13 The Evans-Searles test trajectory antitrajectory
14 The Evans-Searles test trajectory antitrajectory
15 The Evans-Searles dissipation function time-integrated dissipation function Probability of selecting configuration at t=0 t 0 Probability of selecting, at t=0, the velocity inverted evolved configuration M T Important assumption: initial pdf is velocity symmetric. Ensures that t 0( ) 0
16 The Past Hypothesis The possible states of the universe in the past differ from those in the future Implies asymmetry in velocity statistics
17 A constraint on configurations Configuration and its velocity inverse cannot be equally possible (except in thermal equilibrium) If so future would be like the past
18 An illustration of the problem Suppose the initial ensemble contains trains that can only go forwards? a form of Past Hypothesis. ' = 0 M v T ' M T
19 Need a modified Evans-Searles test Select configuration, then invert I J Ford, New J. Phys 17 (2015)
20 The modified dissipation function Probability of selecting configuration at t=0 0 Dissipation production Probability of selecting, at t=0, the velocity inverted evolved configuration Initial pdf can be velocity asymmetric: no conflict with Past Hypothesis
21 Example: alignment of particle direction of motion with a field d sin dt pdf over directions f (,0) f (, t) f (,0)
22 Initial velocity symmetry and asymmetry f1(,0) f2(,0) cos 2 t t Evans-Searles fluctuation theorem
23 Reversibility tested by s tot How likely is an antitrajectory of previous behaviour?
24 How likely is an antitrajectory from the start?
25 The obverse and reverse trajectories Obverse trajectory runs concurrent with the trajectory Reverse trajectory runs subsequent to the trajectory
26 Mathematical contrast (and similarity) Transition probability from to deterministically mapped to
27 Quantum example with Claudia Clarke image: Konrad Szacilowski Two level system (qubit) i / 2 0 e sin / 2 1 ( t), ( t) cos Evolution on the Bloch sphere
28 Velocity inversion = complex conjugation y z ' S t * * S t * ' T M ') ( ) ( ln ) ( f f t d f f f t ') ( ) ( )ln ( Mean dissipation production = a Kullback-Leibler divergence
29 Symmetric pdf f (, ) f (, ) t
30 pdf of dissipation production Process: /2 rotation about x axis
31 What have we learnt (so far) Dissipation production ω t Modified version of time-integrated Evans-Searles dissipation function t Suitable for velocity asymmetric pdfs implied by Past Hypothesis Average increases with elapsed time reminiscent of thermodynamic entropy (but different) similar to stochastic entropy production (but different) evolution can be asymmetric in time
32 The MESSAGE How to measure irreversibility? For stochastic dynamics: stochastic entropy production measures reversibility For deterministic dynamics: dissipation production measures obversibility Thanks for listening! I J Ford, New J. Phys 17 (2015)
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