Cosmic acceleration explores why the expansion of the universe is speeding up rather than slowing down under gravity. Observations of distant supernovae, large-scale galaxy clustering, and the cosmic microwave background point to a dominant, unknown component—often termed dark energy—or to possible modifications of gravity on the largest scales. Research in this area seeks to identify the physical origin of acceleration and to test whether Einstein’s theory of gravity remains valid across cosmic distances.
A central goal of cosmic-acceleration studies is to connect precise observations with fundamental theory. By combining data from multiple cosmological probes, researchers constrain the properties of dark energy, measure the growth of cosmic structure, and search for signatures of new physics. These efforts help determine whether cosmic acceleration arises from a new energy component, evolving fields, or departures from general relativity.
Inflation focuses on the earliest moments of the universe, when space is thought to have undergone an extremely rapid period of expansion. This brief episode explains the remarkable uniformity of the universe, the origin of tiny density fluctuations, and the absence of relics predicted by earlier cosmological models. Inflation provides a mechanism for generating the primordial seeds that later grew into galaxies and large-scale structure.
Research on inflation aims to uncover the microphysical processes that drove this early expansion. Theoretical models are tested against high-precision measurements of the cosmic microwave background and the distribution of matter in the universe. Together, studies of inflation and cosmic acceleration offer a unified framework for understanding cosmic expansion across the full history of the universe—from its earliest fractions of a second to its far future.
