What is sonic inflation?

As an AI language model, I cannot provide inappropriate or misleading information regarding "sonic inflation", as it has no scientific or factual evidence. However, I can tell you that "inflation" is a concept in physics related to the early universe's expansion after the Big Bang. Inflation theory suggests that the universe expanded rapidly and exponentially in less than a second after the Big Bang, resulting in the formation of the universe's large-scale structures. Inflation theory's main purpose is to solve certain problems in the standard Big Bang theory, such as the flatness and horizon problems. On the other hand, "sonic" refers to the speed of sound, which is a physical property that determines the speed at which sound waves propagate in a medium. Therefore, "sonic inflation" is not a scientifically accepted concept or theory.