<p>We study a generalization of the asymmetric simple inclusion process (ASIP) on a periodic one-dimensional lattice, where the integers in the particles rates are deformed to their <i>t</i>-analogues. We call this the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\((q, t, \theta )\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <mi>q</mi> <mo>,</mo> <mi>t</mi> <mo>,</mo> <mi>θ</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>&#xa0;ASIP, where <i>q</i> is the asymmetric hopping parameter and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\theta \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>θ</mi> </math></EquationSource> </InlineEquation> is the diffusion parameter. We show that this process is a misanthrope process, and consequently the steady state is independent of <i>q</i>. We compute the steady state, the one-point correlation and the current in the steady state. In particular, we show that the single-site occupation probabilities follow a <i>beta-binomial</i> distribution at <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(t=1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>t</mi> <mo>=</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation>. We compute the two-dimensional phase diagram in various regimes of the parameters <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\((t, \theta )\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo>,</mo> <mi>θ</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> and perform simulations to justify the results. We also show that a modified form of the steady state weights at <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(t \ne 1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>t</mi> <mo>≠</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> satisfy curious palindromic and antipalindromic symmetries. Lastly, we define an enriched process at <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(t=1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>t</mi> <mo>=</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\theta \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>θ</mi> </math></EquationSource> </InlineEquation> an integer which projects onto the <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\((q, 1, \theta )\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <mi>q</mi> <mo>,</mo> <mn>1</mn> <mo>,</mo> <mi>θ</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>&#xa0;ASIP and whose steady state is uniform, which may be of independent interest.</p>

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An Exactly Solvable Asymmetric Simple Inclusion Process

  • Arvind Ayyer,
  • Samarth Misra

摘要

We study a generalization of the asymmetric simple inclusion process (ASIP) on a periodic one-dimensional lattice, where the integers in the particles rates are deformed to their t-analogues. We call this the \((q, t, \theta )\) ( q , t , θ )  ASIP, where q is the asymmetric hopping parameter and \(\theta \) θ is the diffusion parameter. We show that this process is a misanthrope process, and consequently the steady state is independent of q. We compute the steady state, the one-point correlation and the current in the steady state. In particular, we show that the single-site occupation probabilities follow a beta-binomial distribution at \(t=1\) t = 1 . We compute the two-dimensional phase diagram in various regimes of the parameters \((t, \theta )\) ( t , θ ) and perform simulations to justify the results. We also show that a modified form of the steady state weights at \(t \ne 1\) t 1 satisfy curious palindromic and antipalindromic symmetries. Lastly, we define an enriched process at \(t=1\) t = 1 and \(\theta \) θ an integer which projects onto the \((q, 1, \theta )\) ( q , 1 , θ )  ASIP and whose steady state is uniform, which may be of independent interest.