The Phase Limit Set of a Variety
  A coamoeba is the image of a subvariety of a complex torus under the argument map to the real torus. We describe the structure of the boundary of the coamoeba of a variety, which we relate to its logarithmic limit set. Detailed examples of lines in three-dimensional space illustrate and motivate these results. 
Mounir Nisse and Frank Sottile
math.AG math.CV