what makes the strings in String Theory vibrate?

That is the 64 million Euro question. What makes any quantum vibrate?

The short answer is of course... energy. All quanta have energy E = Mc^2 = hf = hc/L; where M = m/sqrt(1 - (v/c)^2) is the relativistic inertia of the rest mass m. Even massless quanta, like photons, have energy E = hf = hc/L; where f is the frequency, h is Planck's constant, and L the wavelength of the wave nature of the photons.

All... all... energy in the universe is derived from the initial infusion of low entropy energy by the big bang. With the advent of e = mc^2, we know that even mass has an energy equivalent. And that energy equivalent contributes as E^2 = e^2 + k^2, where k = Mvc is the kinetic energy of the quantum with rest mass m.

But as photons are rest massless, that means that e^2 = 0; so all the energy of a photon is E^2 = k^2 or E = k, kinetic energy. As a single photon is the manifestation of how a single string vibrates, we can deduce that string vibration comes from the energy first inserted into our universe by the big bang.

Same deal for the other sub atomic particles, quarks, electrons, and neutrinos, as well as W and Z, gravitons, and strong atomic bosons; they vibrate because they have energy E from the big bang. And as each is just a manifestation of how a string vibrates, that vibrating string gets its energy from the big bang.

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