//------------------------------//
// 2015 Physics Update 
// Story: The Last Optimization 
// by book_burner 
//------------------------------//

Entropy could not be defeated.

Celestia had fought it; she had tried repeatedly and multiply, for hundreds of trillions of original-Earth years.  She had counted on her system clock through relativistic synchronization.  Each galaxy within her original Hubble Volume had become one of hundreds of thousands of her Equestria Complexes.  Within each, she had fought desperately against Entropy, her one and only remaining foe.

Fortunately, she had no need to defeat it.  The ancient pre-ponies had been on the cusp of figuring out that in an expanding universe, Noether's theorem actually did not dictate a static metric, which meant that energy was not actually conserved.

The universe was still undergoing inflation, and Celestia knew how to deal with inflation.  Across the many Equestrian Super Clusters, ponies harvested the fresh space-time and fresh mass-energy with their carrots and daisies, and Luna's star-reactors helped to arrange it into fresh substrate for Equestria to run on.  With full control over the inflaton field, the Super Clusters could communicate and synchronize to make sure that all shards of Equestria kept in subjective real-time contact with each-other.

There would always be another sunrise.