  The continuous-time quantum Monte Carlo method is applied to the interacting
resonant level model (IRLM) using double expansion with respect to Coulomb
interaction Ufc and hybridization V. Thermodynamics of the IRLM without spin is
equivalent to the anisotropic Kondo model in the low-energy limit. Exact
dynamics and thermodynamics of the IRLM are derived numerically for a wide
range of Ufc with a given value of V. For negative Ufc, excellent agreement
including a quantum critical point is found with a simple scaling formula that
deals with V in the lowest-order, and Ufc up to infinite order. As Ufc becomes
positive and large, lower order scaling results deviate from exact numerical
results. Possible relevance of the results is discussed to certain Samarium
compounds with unusual heavy-fermion behavior.

Strongly Correlated Electrons