Homemath.DSarXiv:2605.30197

Connection of hypocoercivity and hypocontractivity via the $\theta$-methods

math.DS2026-05v1license

Abstract

Recent literature shows that hypocoercivity properties of linear evolution equations (in particular their exponential decay and the sharp short time decay of their propagator norm) carry over to their discretization via the midpoint rule. This note discusses this connection for the (other) θ\theta-methods, i.e.\ for θ12\theta\ne\frac12. It is shown that any implicit discretization with θ(12,1]\theta\in (\frac12,1] (pertaining to a hypocoercive continuous-time evolution equation) is contractive, and not only hypocontractive -- in contrast to the midpoint rule. For a coercive continuous-time evolution equation, a discretization with θ[0,12)\theta\in [0,\frac12) is contractive for time steps small enough.

Comments: 7 pages

Cite

@article{arxiv.2605.30197,
  title  = {Connection of hypocoercivity and hypocontractivity via the $\theta$-methods},
  author = {Anton Arnold and Stefan Egger},
  journal= {arXiv preprint arXiv:2605.30197},
  year   = {2026}
}