The current understanding of the accelerating expansion of the universe is that it is due to a mysterious form of energy called dark energy. This concept is derived from observations of supernovae and the cosmic microwave background radiation, which suggest that the expansion rate of the universe is increasing.

The FLRW metric, which describes the large-scale structure of the universe, is used to model the expansion of the universe. It takes into account the distribution of matter and energy in the universe and provides a framework for understanding how the universe evolves over time.

The acceleration of the expansion rate of the universe is not directly related to the FLRW metric itself. Rather, it is believed to be due to a repulsive force associated with dark energy. This force counteracts the gravitational attraction of matter and causes the expansion rate to accelerate.

The exact nature of dark energy remains one of the biggest mysteries in physics, and its properties are still poorly understood. However, ongoing research and observations are helping to shed light on this enigmatic force and its role in shaping the evolution of the universe.
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