text: The spectral index n-sub-s is one parameter in this theory that quantifies its departure from scale invariance.
full_question: The spectral index n-sub-s is one parameter in this theory that quantifies its departure from scale invariance. Early versions of this theory involved false vacuum states that failed to account for the radiation needed for reheating. Newer models use a scalar field with a namesake parameter involving the ratio of the second time derivative of the Hubble parameter to the product of the Hubble parameter and its first time derivative: the "slow roll" parameter. This theory answers the question of why the universe is isotropic if different areas are not in causal contact, known as the horizon problem. The main process this theory predicts was finished by 10 to the negative 32 seconds after the Big Bang. Alan Guth developed, for 10 points, what theory which posits a rapid expansion of the early universe?
first_sentence: The spectral index n-sub-s is one parameter in this theory that quantifies its departure from scale invariance.
raw_answer: cosmic inflation theory