Chaotic inflation theory, first formulated by Andrei Linde, models quantum fluctuations in the rate of cosmic inflation[1]. Those regions with a higher rate of inflation expand faster and dominate the universe, despite the natural tendency of inflation to end in other regions. This allows inflation to continue forever, to produce future-eternal inflation. More recently past-eternal models have been proposed which adhere to the perfect cosmological principle and have features of the steady state cosmos.[2][3] Andrei Linde is an American physicist and professor of Physics at Californias Stanford University. ... In physical cosmology, cosmic inflation is the idea that the nascent universe passed through a phase of exponential expansion that was driven by a negative-pressure vacuum energy density. ... The Perfect Cosmological Principle is an extension of the Cosmological Principle stating that the Universe is not only homogeneous and isotropic in space, but also in time. ... In cosmology, the steady state theory (also known as the Infinite Universe Theory or continuous creation) is a model developed in 1948 by Fred Hoyle, Thomas Gold, Hermann Bondi and others as an alternative to the Big Bang theory (known, usually, as the standard cosmological model). ...