BRUCE: The cosmic coincidence problem is the observation in modern cosmology that the energy densities of dark matter and dark energy are roughly the same order of magnitude today. In the the 81018 Model the problem goes away. Here is the summary of the historic problem as cited by GoogleSearch:
Why It Is a Puzzle
- Different behaviors: Dark matter pulls matter together and slows down the expansion of the universe. Dark energy pushes space apart and accelerates that expansion. [1]
- Different timelines: As the universe grows, dark matter dilutes quickly. Dark energy stays nearly constant.
- The “Why Now” question: For these two competing forces to have similar strength during our exact era seems like a massive statistical coincidence. Just a few billion years ago, dark matter dominated completely. In the future, dark energy will completely dominate. [1, 2]
Possible Explanations by Google Search (DeepMind):
- Dynamic dark energy: Some models propose that dark energy is not constant, but changes over time and interacts with matter to balance out. [1]
- Shared origin: Theories suggest dark matter and dark energy might be different sides of the same fundamental physical field or force. [1]
- Anthropic principle: Observers can only exist during an epoch when structures like galaxies have time to form before dark energy tears everything apart.