Hello everyone, I'm a undergraduate student in the field of physics. I'm working toward a BS in Physics from University of North Carolina at Wilmington. I've been thinking about string modes of resonance lately and wonder if the theory allows strings to stop vibrating or change resonance frequency. If so, this could explain 'virtual particle' clouds. Imagine: A string that is not vibrating could not be detected by modern equipment. However, if that string suddenly started vibrating at the frequency of a photon, then it would seem to us the photon magically popped into existance from nowhere. Thanks in advance for your thoughts and responses! Especially those that include math.