  Here we present some results that would possibly have attracted the attention
of the physics community in the early days of quantum mechanics in such a way
that its development could have been different from what we see today. We will
first present a derivation of Planck's blackbody spectrum radiation without the
hypothesis of quantized energy levels of the oscillator, the only additional
hypothesis to the classical theory being the existence of zeropoint
fluctuations in the electromagnetic field, and this would stand as a nontrivial
vacuum which could be inferred by classical means. After doing this, we derive
the Unruh-Hawking effect for the electromagnetic field in a purely undulatory
context, without dualities and without photons, and one question, among many
others, arises after these statements: What would be the development of quantum
mechanics if Planck was aware of these possibilities?
