The conversation between human and AI assistant.
Is dark/vacuum energy infinite because the expansion of the universe is infinite and more and more of it is created as the universe expands?
Are there any competing theories to explain the acceleration of the universe's expansion besides dark energy?
Yes, there are. One alternative theory suggests that the acceleration may be caused by a modification of gravity on very large scales, while another proposes the existence of a new type of subatomic particle called a "sterile neutrino." However, these theories are still being studied and may not be widely accepted by the scientific community.