Shock interactions for the Burgers-Hilbert equation

This paper provides an asymptotic description of a solution to the Burgers-Hilbert equation in a neighborhood of a point where two shocks interact. The solution is obtained as the sum of a function with H-2 regularity away from the shocks plus a corrector term having an asymptotic behavior like vertical bar x vertical bar In vertical bar x vertical bar close to each shock. A key step in the analysis is the construction of piecewise smooth solutions with a single shock for a general class of initial data.