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A text designed for courses in quantum statistical physics, which explains the concept of the density matrix and links it with the quantum theory of relaxation and decoherence and with the most common spectroscopic probes. 

This book covers the material for a one-semester introductory course in quantum statistical physics, designed for Master’s students in chemical physics and biophysics preparing to work in the fields of NMR, vibrational spectroscopy, or electronic spectroscopy. The course introduces the density matrix formalism and connects it to students’ existing knowledge of classical statistical physics. It then presents the main results of quantum relaxation theory in terms of population transfer and decoherence, and relates quantum relaxation to its most widely used experimental probes in spectroscopy.

During World War II, a group of physicists who had once been close friends found themselves on opposite sides of a deadly race. German scientist Werner Heisenberg and American physicists Robert Oppenheimer, Enrico Fermi, and Sam Goudsmit were all leading figures in nuclear research. But after the attack on Pearl Harbor, their shared passion for science turned into a high-stakes competition to build the world’s first atomic bomb—a weapon that could determine the outcome of the war. Heisenberg had a two-year head start, and the possibility that Nazi Germany might beat the Allies to the bomb terrified American scientists. The Manhattan Project, led by U.S. Army General Leslie Groves, became a massive effort to catch up. Fear of Heisenberg haunted Manhattan Project scientists. At one point, Groves even approved plans to bomb Heisenberg’s lab and assassinate him to stop Germany’s progress. Meanwhile, Sam Goudsmit led a secret military unit tasked with tracking down Heisenberg and uncovering the truth about the Nazi nuclear program. What they found would surprise everyone. The Greatest Scientific Gamble tells the dramatic and little-known story of how personal relationships, wartime fear, and scientific ambition collided in the race to unlock the power of the atom.

From the brilliant Philip Ball, a thrilling biography of Nobel Prize–winning Danish physicist Niels Bohr, the most radical quantum mechanician of all.

In the first half of the twentieth century, the tremendous energy locked up in the nucleus of an atom was discovered and then liberated, bringing both the promise of utopia and the threat of apocalypse. The dawn of the nuclear age is often associated with Albert Einstein, whose iconic equation E = mc2 revealed the staggering energy available from radioactive transformation, or with J. Robert Oppenheimer, who led the project at Los Alamos to build the first nuclear bombs. But the person who arguably did more than any other to shape the Promethean era in which we now live was the Danish physicist Niels Bohr.

In The Man Who Broke Reality, renowned science communicator Philip Ball reveals that it was Bohr who first explained the physics of the nuclear atom, and it was his model of the atom’s dense nucleus that enabled scientists to understand how it could be split apart. Ball also shows how Bohr was the central figure in the development of quantum mechanics, the theory of matter and energy that destabilized centuries of thinking not just about the microscopic nature of the world but about physical reality itself.

Bohr’s story is the story of modern physics and its transformative impact on the world. But The Man Who Broke Reality is not merely an intellectual drama. It chronicles a heroic life lived in turbulent times, across two world wars, the Manhattan Project, and the arms race of the Cold War. And it establishes Bohr as one of the most profound, inventive, and iconoclastic thinkers of the twentieth century.

From the brilliant Philip Ball, a thrilling biography of Nobel Prize–winning Danish physicist Niels Bohr, the most radical quantum mechanician of all.

In the first half of the twentieth century, the tremendous energy locked up in the nucleus of an atom was discovered and then liberated, bringing both the promise of utopia and the threat of apocalypse. The dawn of the nuclear age is often associated with Albert Einstein, whose iconic equation E = mc2 revealed the staggering energy available from radioactive transformation, or with J. Robert Oppenheimer, who led the project at Los Alamos to build the first nuclear bombs. But the person who arguably did more than any other to shape the Promethean era in which we now live was the Danish physicist Niels Bohr.

In The Man Who Broke Reality, renowned science communicator Philip Ball reveals that it was Bohr who first explained the physics of the nuclear atom, and it was his model of the atom’s dense nucleus that enabled scientists to understand how it could be split apart. Ball also shows how Bohr was the central figure in the development of quantum mechanics, the theory of matter and energy that destabilized centuries of thinking not just about the microscopic nature of the world but about physical reality itself.

Bohr’s story is the story of modern physics and its transformative impact on the world. But The Man Who Broke Reality is not merely an intellectual drama. It chronicles a heroic life lived in turbulent times, across two world wars, the Manhattan Project, and the arms race of the Cold War. And it establishes Bohr as one of the most profound, inventive, and iconoclastic thinkers of the twentieth century.