It is not exactly clear how the flux capacitor works. One could assume it involves some sort of quantum tunneling. This is based on the observation that the DeLorean, after travelling through time, seems to be extremely cold. In quantum tunneling, electrons pass through a high energy barrier. This is expressed as a probability. Electrons that pass through the barrier, experience a loss in energy. Although a DeLorean is infinitely more complex than an electron, we can make this playful hypothesis. Other possibilities involve the creation of a wormhole, through which the DeLorean travels.