Nambu-Goto string without tachyons between a heavy and a light quark — real interquark potential at all distances

We point out that in infinite spacetime dimensions, the singularity in the interquark potential at small distances disappears if a Nambu-Goto string is anchored at one end to an infinitely heavy quark, at the other end to an infinitely light quark. This suggests that if such quarks are placed at the ends, some unphysical features such as tachyon states are absent also in finite dimensions.