Alan Guth
Proposed the theory of cosmic inflation, a modification of the Big Bang theory.
Most quoted
"If you ask where the energy for the Big Bang came from, the answer from inflation is that gravitational energy can be negative, and it can exactly cancel the positive energy of matter."
— from Lecture
"The inflationary universe theory says that the universe began as a tiny speck of false vacuum, which then inflated exponentially to become the enormous universe we see today."
— from Scientific paper/lecture
"The universe is like a giant puzzle, and we're slowly putting the pieces together. But sometimes we find a piece that doesn't fit, and then we have to start all over again."
— from Lecture
All quotes by Alan Guth (423)
The fact that the universe is comprehensible, that it follows laws of physics that we can discover, is a remarkable fact.
Inflation makes the universe big, smooth, and flat.
The initial conditions for the Big Bang are not something we put in by hand; they are produced by the inflationary expansion itself.
The universe could have started from a random quantum fluctuation.
The multiverse idea is a possible consequence of inflation, but it's not the reason inflation was invented.
Science is a process of successive approximation.
The goal of physics is to understand the universe at its most fundamental level.
Cosmology is the study of the universe as a whole—its origin, evolution, and ultimate fate.
The horizon problem—why the universe looks the same in all directions—was a major motivation for inflation.
Inflation stretches any initial wrinkles in spacetime to such enormous scales that they become unobservable, explaining the smoothness.
The flatness problem asked why the universe is so precisely balanced between expanding forever and collapsing. Inflation drives the universe toward flatness.
The monopole problem—why we don't see exotic particles predicted by grand unified theories—was solved by inflation diluting them away.
The false vacuum is a metastable state that can drive exponential expansion.
Inflation ends when the false vacuum decays, like water freezing into ice, releasing energy to create matter and radiation.
Quantum fluctuations during inflation become the seeds for all structure in the universe: galaxies, stars, and us.
The pattern of hot and cold spots in the cosmic microwave background is a snapshot of the quantum fluctuations from the very early universe.
We are testing the physics of the universe at energies a trillion times higher than the Large Hadron Collider can reach.
The universe is not only stranger than we imagine, it is stranger than we can imagine.
The discovery of the accelerating universe was a shock, but it fits well with the idea of a cosmological constant, which Einstein first introduced.
Dark energy is the modern name for the cosmological constant, and it appears to be causing the expansion of the universe to speed up.
Contemporaries of Alan Guth
Other Physicss born within 50 years of Alan Guth (1947).