How is the Problem of the World as a Perpetuum Mobile Addressed in Contemporary Physics?

I found Stephen Hawking's television programs interesting. Stephen Hawking avoids this question with the help of negative energy.
The Big Bang is said to have created as much negative energy as mass, and this negative energy is distributed throughout the world. Likewise, the end of the world would be a final bang. The negative energy would recombine with the mass.
Without an end, the world would run out of hydrogen.
Therefore, there are other ideas of an end time. However, they are said to lie in the distant future.
Stephen Hawking also pointed out the problem of an eternal world in his book "Space and Time". In a pulsating world, there is no explanation for the low entropy at the Big Bang after a collapse of the world, which Stephen Hawking mentions in that book.
Roger Penrose seems to have found a solution in his book "Cycles of Time". I hope that astronomy will discover whether there was a Big Bang at all.
Of course, it's subjective that I find my theory simpler and more credible.

Ludwig Resch