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Crossover from the pair contact process with diffusion to directed percolation.

Su-Chan Park1, Hyunggyu Park

  • 1School of Physics, Korea Institute for Advanced Study, Seoul 130-722, Korea.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 12, 2006
PubMed
Summary
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This study investigates phase transitions in one-dimensional systems, revealing distinct crossover behaviors. Numerical estimates support the non-directed percolation (DP) nature of the pair contact process with diffusion (PCPD).

Area of Science:

  • Statistical Physics
  • Complex Systems
  • Phase Transitions

Background:

  • The pair contact process with diffusion (PCPD) and its driven variant (DPCPD) are models exhibiting complex dynamics.
  • Understanding their relationship to directed percolation (DP), a fundamental universality class, is crucial for statistical physics.
  • Previous studies suggested potential connections, but detailed analysis of crossover behaviors was lacking.

Purpose of the Study:

  • To investigate the crossover behaviors between PCPD, DPCPD, and directed percolation (DP) in a one-dimensional system.
  • To numerically estimate crossover exponents and determine the universality class of PCPD and DPCPD.
  • To provide evidence for the non-DP nature of PCPD critical scaling.

Main Methods:

  • Introduction of single-particle annihilation and/or branching dynamics into PCPD and DPCPD models.

Related Experiment Videos

  • Numerical estimation of crossover exponents (phi) using computational simulations.
  • Analysis of critical amplitude scaling to support findings.
  • Main Results:

    • Crossover exponents were estimated: 1/phi ≈ 0.58 ± 0.03 for PCPD and 1/phi ≈ 0.49 ± 0.02 for DPCPD.
    • The nontrivial crossover exponent for PCPD supports its non-DP nature and anomalous critical amplitude scaling.
    • The DPCPD crossover aligns with mean-field predictions for the tricritical DP class.

    Conclusions:

    • PCPD exhibits distinct critical scaling behavior, diverging from the directed percolation universality class.
    • DPCPD demonstrates crossover behavior consistent with theoretical predictions for tricritical directed percolation.
    • The study clarifies the universality class of these models and their interrelations.