According to eternal inflation, the inflationary phase of the universe's expansion lasts forever throughout most of the universe. Because the regions expand exponentially rapidly, most of the volume of the universe at any given time is inflating. Eternal inflation, therefore, produces a hypothetically infinite multiverse, in which only an insignificant fractal volume ends inflation.
Alan Guth's 2007 paper, "Eternal inflation and its implications", states that under reasonable assumptions "Although inflation is generically eternal into the future, it is not eternal into the past." Guth detailed what was known about the subject at the time, and demonstrated that eternal inflation was still considered the likely outcome of inflation, more than 20 years after eternal inflation was first introduced by Steinhardt.
Development of the theory
Inflation, or the inflationary universe theory, was originally developed as a way to overcome the few remaining problems with what was otherwise considered a successful theory of cosmology, the Big Bang model.
In 1979, Alan Guth introduced the inflationary model of the universe to explain why the universe is flat and homogeneous (which refers to the smooth distribution of matter and radiation on a large scale).  The basic idea was that the universe underwent a period of rapidly accelerating expansion a few instants after the Big Bang. He offered a mechanism for causing the inflation to begin: false vacuum energy. Guth coined the term "inflation," and was the first to discuss the theory with other scientists worldwide.
Guth's original formulation was problematic, as there was no consistent way to bring an end to the inflationary epoch and end up with the hot, isotropic, homogeneous universe observed today. Although the false vacuum could decay into empty "bubbles" of "true vacuum" that expanded at the speed of light, the empty bubbles could not coalesce to reheat the universe, because they could not keep up with the remaining inflating universe.
In 1982, this "graceful exit problem" was solved independently by Andrei Linde and by Andreas Albrecht and Paul J. Steinhardt  who showed how to end inflation without making empty bubbles and, instead, end up with a hot expanding universe. The basic idea was to have a continuous "slow-roll" or slow evolution from false vacuum to true without making any bubbles. The improved model was called "new inflation."
In 1983, Paul Steinhardt was the first to show that this "new inflation" does not have to end everywhere.  Instead, it might only end in a finite patch or a hot bubble full of matter and radiation, and that inflation continues in most of the universe while producing hot bubble after hot bubble along the way. Alexander Vilenkin showed that when quantum effects are properly included, this is actually generic to all new inflation models. 
Using ideas introduced by Steinhardt and Vilenkin, Andrei Linde published an alternative model of inflation in 1986 which used these ideas to provide a detailed description of what has become known as the Chaotic Inflation theory or eternal inflation. 
New inflation does not produce a perfectly symmetric universe due to quantum fluctuations during inflation. The fluctuations cause the energy and matter density to be different in different points in space.
Quantum fluctuations in the hypothetical inflation field produce changes in the rate of expansion that are responsible for eternal inflation. 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.
In 1980, quantum fluctuations were suggested by Viatcheslav Mukhanov and Gennady Chibisov  in the Soviet Union in the context of a model of modified gravity by Alexei Starobinsky  to be possible seeds for forming galaxies.
In the context of inflation, quantum fluctuations were first analyzed at the three-week 1982 Nuffield Workshop on the Very Early Universe at Cambridge University.  The average strength of the fluctuations was first calculated by four groups working separately over the course of the workshop: Stephen Hawking;  Starobinsky;  Guth and So-Young Pi;  and James M. Bardeen, Paul Steinhardt and Michael Turner. 
The early calculations derived at the Nuffield Workshop only focused on the average fluctuations, whose magnitude is too small to affect inflation. However, beginning with the examples presented by Steinhardt  and Vilenkin,  the same quantum physics was later shown to produce occasional large fluctuations that increase the rate of inflation and keep inflation going eternally.
In analyzing the Planck Satellite data from 2013, Anna Ijjas and Paul Steinhardt showed that the simplest textbook inflationary models were eliminated and that the remaining models require exponentially more tuned starting conditions, more parameters to be adjusted, and less inflation. Later Planck observations reported in 2015 confirmed these conclusions.
A 2014 paper by Kohli and Haslam called into question the viability of the eternal inflation theory, by analyzing Linde's chaotic inflation theory in which the quantum fluctuations are modeled as Gaussian white noise. They showed that in this popular scenario, eternal inflation in fact cannot be eternal, and the random noise leads to spacetime being filled with singularities. This was demonstrated by showing that solutions to the Einstein field equations diverge in a finite time. Their paper therefore concluded that the theory of eternal inflation based on random quantum fluctuations would not be a viable theory, and the resulting existence of a multiverse is "still very much an open question that will require much deeper investigation".
Inflation, eternal inflation and the multiverse
In 1983, inflation was shown to be eternal leading a multiverse in which space is broken up into bubbles or patches whose properties differ from patch to patch spanning all physical possibilities.
Paul Steinhardt, who produced the first example of eternal inflation,  eventually became a strong and vocal opponent of the theory. He argued that the multiverse represented a breakdown of the inflationary theory, because, in a multiverse, any outcome is equally possible, so inflation makes no predictions and, hence, is untestable. Consequently, he argued, inflation fails a key condition for a scientific theory. 
Both Linde and Guth, however, continued to support the inflationary theory and the multiverse. Guth declared:
It's hard to build models of inflation that don't lead to a multiverse. It's not impossible, so I think there's still certainly research that needs to be done. But most models of inflation do lead to a multiverse, and evidence for inflation will be pushing us in the direction of taking the idea of a multiverse seriously.. 
According to Linde, "It's possible to invent models of inflation that do not allow a multiverse, but it's difficult. Every experiment that brings better credence to inflationary theory brings us much closer to hints that the multiverse is real.”. 
- Gibbons, Gary W.; Hawking, Stephen W.; Siklos, S.T.C., eds. (1983). "Natural Inflation". The Very Early Universe. Cambridge University Press. pp. 251–66. ISBN 0-521-31677-4.
- Vilenkin, Alexander (1983). "Birth of Inflationary Universes". Physical Review D. 27 (12): 2848–2855. Bibcode:1983PhRvD..27.2848V. doi:10.1103/PhysRevD.27.2848.
- Guth, Alan; Eternal inflation and its implications arXiv:hep-th/0702178
- Guth, Alan H. "Inflationary universe: A possible solution to the horizon and flatness problems". Phys. Rev. D. 23 (2): 347–356. doi:10.1103/PhysRevD.23.347.
- Albrecht, A.; Steinhardt, P. J. (1982). "Cosmology For Grand Unified Theories With Radiatively Induced Symmetry Breaking". Phys. Rev. Lett. 48 (17): 1220–1223. Bibcode:1982PhRvL..48.1220A. doi:10.1103/PhysRevLett.48.1220.
- Linde, A.D. (August 1986). "Eternally Existing Self-Reproducing Chaotic Inflationary Universe" (PDF). Physics Letters B. 175 (4): 395–400. Bibcode:1986PhLB..175..395L. doi:10.1016/0370-2693(86)90611-8.
- Mukhanov, ViatcheslavF.; Chibisov, G. V. (1981). "Quantum fluctuation and "nonsingular" universe". JETP Letters. 33: 532–5. Bibcode:1981JETPL..33..532M.
- Mukhanov, Viatcheslav F. (1982). "The vacuum energy and large scale structure of the universe". Soviet Physics JETP. 56: 258–65.
- Starobinsky, A. A. (1979). "Spectrum of Relict Gravitational Radiation and The Early State of the Universe" (PDF). JETP Lett. 30: 682. Bibcode:1979JETPL..30..682S.
- See Guth (1997) for a popular description of the workshop, or The Very Early Universe, ISBN 0521316774 eds Hawking, Gibbon & Siklos for a more detailed report
- Hawking, S.W. (1982). "The development of irregularities in a single bubble inflationary universe". Physics Letters B. 115 (4): 295–297. Bibcode:1982PhLB..115..295H. doi:10.1016/0370-2693(82)90373-2.
- Starobinsky, Alexei A. (1982). "Dynamics of phase transition in the new inflationary universe scenario and generation of perturbations". Physics Letters B. 117 (3–4): 175–8. Bibcode:1982PhLB..117..175S. doi:10.1016/0370-2693(82)90541-X.
- Guth, A.H.; Ping, So-Young (1982). "Fluctuations in the new inflationary universe". Phys. Rev. Lett. 49 (15): 1110–3. Bibcode:1982PhRvL..49.1110G. doi:10.1103/PhysRevLett.49.1110.
- Bardeen, James M.; Steinhardt, Paul J.; Turner, Michael S. (1983). "Spontaneous creation of almost scale-free density perturbations in an inflationary universe". Physical Review D. 28 (4): 679–693. Bibcode:1983PhRvD..28..679B. doi:10.1103/PhysRevD.28.679.
- Iijas, Anna; Loeb, Abraham; Steinhardt, Paul (2013). "Inflationary Paradigm in trouble after Planck 2013". Phys. Lett. B. 723 (4-5): 261–266. arXiv: . Bibcode:2013PhLB..723..261I. doi:10.1016/j.physletb.2013.05.023.
- Iijas, Anna; Steinhardt, Paul J.; Loeb, Abraham (2014). "Inflationary Schism". Phys. Lett. B. 7: 142–146. Bibcode:2014PhLB..736..142I. doi:10.1016/j.physletb.2014.07.012.
- Steinhardt, Paul J. (April 2011). "Inflation Debate: Is the theory at the heart of modern cosmology deeply flawed?" (PDF). Scientific American. 304: 36–43. doi:10.1038/scientificamerican0411-36.
- Our Universe May Exist in a Multiverse, Cosmic Inflation Discovery Suggests
- 'Multiverse' theory suggested by microwave background BBC News, 3 August 2011 about testing eternal inflation.