Questions tagged [non-equilibrium]

The tag has no usage guidance.

183 questions
Filter by
Sorted by
Tagged with
34 views

50 views

Two types of path intergrals in statistical physics - difference?

In non-equilibrium statistical physics as far as I can tell there are two types of path integrals to find conditional probabilities: Path integrals over the noise in the Langevin equation, $\vec u(t)$...
188 views

303 views

Active Matter Systems

Active matter is composed of large numbers of active "agents", each of which consumes energy in order to move or to exert mechanical forces. Due to the energy consumption, these systems are ...
882 views

How is temperature defined in non-equilibrium?

I see that temperature is defined always in equilibrium. But systems which are not in equilibrium with their environment. How is temperature defined in these cases? Humans for example, have a body ...
33 views

Many-particle systems where current and applied force are in opposite direction

Are there instances known (both observed or theoretic) of large-$N$ systems where applying an external force causes a current of the "corresponding charge" (present in the system) in the direction ...
140 views

Entropy production in non-equilibrium systems: physical interpretation?

I have been learning about entropy production in non-equilibrium systems as developed by Prigogine and others, especially in the context of chemical reactions. I now understand that from the first law ...
540 views

Keldysh formalism and Kubo formula

I am working on out-of-equilibrium problems of strongly correlated materials, so I am interested in the Keldysh formalism. I just started reading about the subject, and I don't understand quite well ...
821 views

131 views

Does the Lindblad equation satisfy a fluctuation dissipation relation?

The fluctuation dissipation relation is usually stated in terms of an identity that relates the retarded, advanced and either the Keldysh or time-ordered correlators. This is easily enforced in ...
752 views

Discrete Langevin Equation

We have the Langevin equation, that describes the motion of a particle in a viscous medium, given by $$\label{Langevin} \frac{dv}{dt} = -\gamma v + \zeta(t)$$ With the ...
478 views

Size of a Brownian particle

Usually in Brownian dynamics, we consider the Brownian particle size to be much-much larger than the size of the particles of the fluid on which the Brownian particle is immersed in. In this scenario ...
41 views

Hydrogen bonding and dichotomous Markov process

The hydrogen bonding function between water and monomer (from a micelle/bilayer) can be defined as $h(t) = 1$ if the hydrogen bond exists between the two and $h(t) = 0$, if there is no hydrogen ...
79 views

How are boundary consitions implemented correctly in time dependent hydrodynamics?

I posted this question more than one year ago and got an answer recently. This answer looks good to me, but indicates that something is wrong in my original approach to the problem. Can someone tell ...
72 views

How is zonal flow defined and computed?

The transition to turbulence in pipe flow was recently observed to be in the same universality class as directed percolation. This was done by reinterpreting the turbulence and laminar flow in terms ...
936 views

Modern textbook on statistical field theory with an emphasis on applications to non-equilibrium phenomena?

What is a good textbook on statistical field theory, with an emphasis on applications to non-equilibrium phenomena? I am a final-year undergraduate, have already taken introductory classes in ...
Say that we have a system evolving over discrete timesteps. The quantity we are interested is X and is given by a distribution $P_X$. This distribution is evolving temporally, and we have a ...