Scaling Behavior of Angular Dependent Resistivity in CeCoIn${}_5$: Possible Evidence for d-Wave Density Waves

In-plane angular dependent resistivity ADR was measured in the non-Fermi liquid regime of CeCoIn${}_5$ single crystals at temperatures $T\le 20$ K and in magnetic fields $H$ up to 14 T. Two scaling behaviors were identified in low field region where resistivity shows T-linear dependence, separated by a critical angle ${\theta }_c$ which is determined by the anisotropy of CeCoIn${}_5$; i.e., ADR depends only on the perpendicular (parallel) field component below (above) ${\theta }_c$. These scaling behaviors and other salient features of ADR are consistent with d-wave density waves.