The concept of particles being waves of probabilities is derived from quantum mechanics, which describes the behavior of particles at the microscopic level. According to quantum mechanics, particles can exhibit wave-like properties and are described by wavefunctions that represent the probability distribution of finding the particle in different states.
In the context of the early universe and the Big Bang, our current understanding is limited due to the lack of a complete theory of quantum gravity. However, it is important to note that the principles of quantum mechanics as we know them today may not necessarily apply in the extreme conditions of the early universe.
At the onset of the Big Bang, the universe underwent rapid expansion and high-energy processes. The exact nature of these processes is not yet fully understood, and physicists are actively researching and exploring different theories to describe the earliest moments of the universe.
It's worth mentioning that the concept of wavefunction collapse and the measurement process is still a topic of debate and interpretation in quantum mechanics. Different interpretations, such as the Copenhagen interpretation or the many-worlds interpretation, offer different perspectives on the nature of measurement and wavefunction collapse.
In summary, our understanding of the early universe and the behavior of particles during the Big Bang is still an active area of research. The nature of quantum mechanics and how it manifests in extreme conditions like those at the beginning of the universe is still an open question.