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Abstract
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The
-dimensional
corner growth model with exponential weights is a centrally important exactly
solvable model in the Kardar–Parisi–Zhang class of statistical mechanical models.
While significant progress has been made on the fluctuations of the growing random
shape, understanding of the optimal paths, or geodesics, is less developed. The
Busemann function is a useful analytical tool for studying geodesics. We describe the
joint distribution of the Busemann functions, simultaneously in all directions of
growth. As applications of this description we derive a marked point process
representation for the Busemann function across a single lattice edge and
calculate some marginal distributions of Busemann functions and semi-infinite
geodesics.
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Keywords
Busemann function, Catalan number, Catalan triangle,
cocycle, competition interface, corner growth model,
directed percolation, geodesic, last-passage percolation,
M/M/1 queue, multiclass fixed point, rhobar distance, TASEP
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Mathematical Subject Classification 2010
Primary: 60K35, 60K37
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Milestones
Received: 30 September 2019
Revised: 21 April 2020
Accepted: 11 May 2020
Published: 16 November 2020
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