Acoustic waves in fractal media: Non-integer dimensional spaces approach

Acoustic waves in fractal media are considered in the framework of continuum models with non-integer dimensional spaces. Using recently suggested vector calculus for non-integer dimensional space, we consider waves in isotropic fractal media. The wave equation for non-integer dimensional space is similar to the equation of waves in non-fractal medium with power-law heterogeneity. We discuss some properties of speed of acoustic waves in fractal materials.