The concept you're describing is an interesting idea, but it does not align with our current understanding of the universe based on scientific observations and theories. Let's break down your questions:
Universe shrinking instead of expanding: The prevailing scientific consensus, supported by various observations such as the redshift of distant galaxies and the cosmic microwave background radiation, suggests that our universe is indeed expanding. This expansion is described by the Big Bang theory, which states that the universe began from an extremely dense and hot state and has been expanding ever since.
Max entropy and the Big Bang singularity: Entropy is a measure of disorder or randomness in a system. The concept of entropy is related to the second law of thermodynamics, which states that the entropy of an isolated system tends to increase over time. The Big Bang singularity, where the universe was in an extremely hot and dense state, can be thought of as a state of very low entropy.
As the universe expands, the entropy tends to increase, not decrease. The idea of reaching a state of maximum entropy leading to a new Big Bang singularity is not supported by current scientific understanding. Instead, the universe's expansion is believed to continue, leading to a gradual increase in entropy.
- Oscillating universe: In the past, scientists have proposed the idea of an oscillating universe, where the expansion is followed by contraction, leading to a cycle of Big Bangs and Big Crunches. However, recent observations, such as the accelerated expansion of the universe, have led to the prevailing view that our universe is not likely to undergo a cyclic pattern of expansion and contraction.
Overall, while your ideas are intriguing, they do not align with the current scientific understanding of the universe. Our understanding is based on a wealth of empirical evidence and theoretical models that have been tested and refined over time.