American theoretical physicist, creator of the inflationary model of the universe, which explains the large-scale homogeneity and flatness of the universe, and also generates the initial perturbations that led to the formation of galaxies.
Biography
He studied at the Massachusetts Institute of Technology, and worked at Princeton, Columbia, and Stanford universities, as well as at MIT. He was awarded the Dirac Medal and other prizes.
Key discoveries
Development of the inflationary stage in the early universe (1981)
Explanation of the horizon and flatness problems
Prediction of the spectrum of primordial perturbations
💡 Guth came up with inflation when he was 32 years old, and the idea came to him while listening to a lecture on problems in cosmology.
Quote: "The inflationary model is often called the 'free lunch' theory because it allows a huge universe to arise almost from nothing."
Scientists used a Bose–Einstein condensate (Bose and Einstein) — a state where atoms move as a single wave — to simulate the first moments after the Big Bang. By tuning interactions, they made it mimic the behavior of spacetime at the tiniest scales. This allowed them to observe “Planckian damping”
The collapse of boson stars triggers the formation of true vacuum bubbles that expand at light speed, altering the properties of all space. This new mechanism shows that even a stable vacuum is vulnerable to astrophysical catastrophes.
An experiment with giant atoms sensitive to electric fields showed how an unstable emptiness transforms into a stable one, forming bubbles. The rate of the process depends on external influences exactly as theory predicts, as long as everything is perfectly calibrated. The slightest imprecision brea
Physicists modeled the behavior of true vacuum bubbles inside a false vacuum using a simplified particle system. It turned out that a bubble either expands indefinitely or collapses, depending on its initial size and the strength of internal bonds. A similar mechanism could have triggered the Big Ba
Generalized equations of the early Universe with a minimal correction better describe the 'quiet' large-scale patterns in ancient light maps, without disturbing the finely tuned small-scale picture. This hints at a gap in the standard inflation model.
A new model shows how dark matter—a dust-like, invisible substance—could have emerged from the geometry of space during the rapid expansion. The mechanism works without fine-tuning: the right amount of matter automatically results from the expansion rate. After matter came to dominate over radiation
In giant cosmic voids, galaxies spin like a single ensemble. Their dance creates a barely noticeable difference in glow from different sides. It turns out that this effect is the most accurate indicator of how uniformly matter was foamed up at the moment of inflation. It is enough to measure it to f
After rapid expansion (inflation), spacetime quickly restructures, triggering instability in the dark matter field. This kicks off an avalanche of particle creation — a purely gravitational mechanism. Calculations and computer simulations confirm that this can explain the observed density of dark ma
In the first moments after the Big Bang, the Universe expanded at an enormous speed. If the expansion briefly paused, it generated powerful gravitational waves. Future detectors on Earth will be able to catch them, opening a window into an era hidden from any telescopes.
Tiny black holes, born in ever-expanding pockets of the universe, may make up all dark matter. This scenario not only explains its abundance but also predicts a detectable hum of gravitational waves.
Physicists have proposed a model where the universe is born alongside its reflection. In this twin, time runs backward and left and right are swapped. A slight difference in the properties of twin particles could have given a tiny edge to matter over antimatter—thus stars and planets emerged.
The quintessential inflation model based on α-attractors describes inflation and modern dark energy as different roles of a single scalar field. Its key prediction is a kination stage, which amplifies high-frequency gravitational waves and leaves an imprint on the cosmic microwave background and pri
New data on the cosmic microwave background challenged the accepted inflation models. The solution was 'friction' in the equations of the field that drove the expansion. This move not only saves the theory but also promises to reveal a distinctive gravitational-wave background detectable by future i
Ripples of space, born at the moment of the Big Bang, still influence how galaxies gather billions of years later. Invisible waves from the universe's infancy clump together unseen mass, especially strongly for distant objects, altering their distribution by up to a factor of two. This discovery tur
It turns out: the birth of black holes in the first moments doesn’t disrupt the harmony of the large-scale structure. Small and large processes in the Universe are separated, like basses and flutes. Thus primordial black holes become legitimate candidates for dark matter.
A new leptogenesis scenario shows: heavy Majorana neutrinos, born from the vacuum by post-inflation expansion, gave rise to the entire baryon asymmetry. Their mass almost mystically matches the inflation scale — and it's no accident: the amplitude of primordial gravitational waves becomes a direct e
Quantum cosmology has long faced a paradox: the elegant idea of a universe born from 'nothing' relentlessly favored dreary microscopic worlds. New research shows that swapping the familiar sphere for a three-dimensional torus rewrites the script. Summing over all possible smooth fillings of the toru
Researchers modified the classic Bousso–Polchinski model, representing vacuum energy as the difference of contributions in flux space. As a result, small values of the cosmological constant form not spheres, but the thinnest 'waffles' — hyperdisks. Analysis of a database of 532 million Calabi–Yau ma
The study unites two poles of quantum cosmology: tunneling from existing space and the no-boundary Hartle–Hawking state. Numerical solutions of Einstein's equations with an axion (or magnetic) charge and a scalar field revealed a family of Euclidean wormholes—their scale-factor profile shaped like a
Calculations suggest: the same quantum field, if it is particularly sensitive to the curvature of space, could act both as the engine of inflation and as dark energy. To do this, the field must be nearly ten times heavier than the Planck mass — roughly like a speck of dust. This coincidence hints th
The new model intertwines cyclic cosmology and inflation into a single dance: two scalar fields, like blacksmith’s bellows and a valve, alternately compress and inflate the Universe. This approach not only lifts the curse of the singularity but also explains the mysterious smoothness of the cosmos,
Scientists have proposed a model of the early universe resembling a traffic jam followed by sudden acceleration. This shift in rhythm naturally smooths out large irregularities in the microwave background—the very ancient light that captured the newborn cosmos. It explains Planck satellite data with
Inflation—the Universe’s rapid ballooning—could act as a detector for special neutrinos. A special interaction, like a filter, amplifies their signal in the ancient light. This could explain the mystery of neutrino mass and point to new physics.
Comparing two models: the standard one requires invisible dark energy, the alternative plays fair. Data with 92% probability support the simpler option.
After the Big Bang, the universe may have been stuck in a false vacuum — a fragile state like an unpopped bubble. A rare true-vacuum bubble could then erupt, causing a colossal expansion that stretched space itself. Now, physicists recreated this on a chip with 4000 tiny magnets, showing how one bub