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We propose a background-independent formulation of cosmic inflation. Theinflation in this picture corresponds to a dynamical process to generate spaceand time while the conventional inflation is simply an (exponential) expansionof a preexisting spacetime owing to the vacuum energy carried by an inflatonfield. We observe that the cosmic inflation is triggered by the condensate ofPlanck energy into vacuum responsible for the dynamical emergence of spacetimeand must be a single event according to the exclusion principle ofnoncommutative spacetime caused by the Planck energy condensate in vacuum. Theemergent spacetime picture admits a background-independent formulation so thatthe inflation can be described by a conformal Hamiltonian system characterizedby an exponential phase space expansion without introducing any inflaton fieldas well as an {\it ad hoc} inflation potential. This implies that the emergentspacetime may incapacitate all the rationales to introduce the multiversehypothesis. In Part I we will focus on the physical foundation of cosmicinflation from the emergent spacetime picture to highlight the main idea. Itsmathematical exposition will be addressed in Part II with a generalization ofthe emergent spacetime picture to matrix string theory.

Emergent Spacetime and Cosmic Inflation I & II