The concept of photons disappearing and reappearing is not a commonly accepted phenomenon within our current understanding of physics. Photons are fundamental particles of light and are considered to be stable and persistent entities. They do not typically disappear and reappear spontaneously.
However, during the early stages of the universe, in the extremely high-energy conditions of the Big Bang, our current theories of physics break down, and the behavior of particles and fields is not well understood. At these extreme energies, quantum effects and the interplay of gravity and quantum mechanics become significant. It is believed that a complete theory of quantum gravity, which would unify quantum mechanics and general relativity, would be required to fully understand the physics of the Big Bang.
The Big Bang theory describes the expansion of the universe from an extremely hot and dense initial state. It does not specifically involve the disappearance and reappearance of photons but rather the rapid expansion and cooling of the universe. The early universe was filled with a hot, dense plasma of particles, including photons, and as the universe expanded and cooled, particles began to form and interact in different ways, leading to the formation of atoms, galaxies, and the structures we observe today.
It is important to note that our understanding of the early universe and the specific details of the Big Bang are still active areas of research, and scientists continue to investigate and refine our understanding of these processes.