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“Theories of everything” go back to the ancient Greeks and their idea that indivisible atoms are the building blocks of reality. This conjecture grew into modern atomic theory, which has been perfected by relativity theory and quantum theory. But there’s never been anything like string theory. Designed to describe the universe at the largest and smallest scales, string theory is the most ambitious and far-reaching theory of everything yet devised, leading to intriguing speculations, such as:
For all of its amazing insights, string theory is, so far, unproven—and some critics claim that it is unprovable. Yet it has already led to breakthroughs in our understanding of black holes, the Big Bang, cosmic inflation, and dark energy, not to mention gravity and the other fundamental forces. In The Mind-Bending Physics of String Theory, noted string theorist Professor Shamit Kachru of the Stanford Institute for Theoretical Physics takes you deep into this fascinating subject in 12 lectures that are rich in mathematical concepts.
Spanning the multi-decade origin and evolution of string theory, Professor Kachru provides an up-to-date survey of modern theoretical physics and its astonishing power to uncover the most profound secrets of nature.
Solving the Mystery of Gravity
One of those profound secrets is the long-sought connection between gravity, electromagnetism, and the strong and weak nuclear forces. The last three are far stronger than gravity, but operate primarily in the subatomic region. They are perfectly described by quantum mechanics. Meanwhile, gravity is the outlier, involving enormous masses like stars and planets that extend their pull across vast reaches of space. Gravity is vanishingly weak at the quantum scale and can’t be explained by standard quantum theory.
String theory aims to unite these fundamental forces to forge a single, comprehensive theory that can simultaneously explain the physics of the subatomic and cosmic realms. Such a breakthrough would marry quantum mechanics and Einstein’s theory of gravity, known as general relativity—a match that has so far challenged the most brilliant minds in physics.
In The Mind-Bending Physics of String Theory, you investigate how string theory may be able to accomplish this and other feats. Some of the exotic concepts you explore include:
Venture across Time, Space, and Unseen Dimensions
As director of one of the world’s premier programs in theoretical physics, Dr. Kachru is in the vanguard of research on string theory. No comparable lecture series goes into the detail he presents in this course, profusely illustrated with animations and graphics. String theory is complicated, and he doesn’t pretend otherwise. However, even scientists simplify their subject to make calculations more manageable, as you learn through a stratagem called the “spherical cow.” This is a widespread practice in theoretical physics that removes complexities to streamline a problem—as if a farmer ignored the appendages on his herd of cattle to get a rough-and-ready estimate of the space needed for a barn.
Dr. Kachru uses supersymmetry as a spherical cow, discounting the fact that the symmetry between particle types cannot be perfect in the real world. Following this approach, he leads you through a breathtaking landscape, featuring:
Equipped with these concepts, you venture across time, space, and unseen dimensions. You explore the Big Bang, the dazzlingly brief era of cosmic inflation, the profound mystery of dark energy, the enigma of black holes, the conundrum of quantum gravity, the unification of the four fundamental forces, and much more—everything really, for The Mind-Bending Physics of String Theory explores a set of ideas that may be, at long last, the theory of everything.
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