E.C. George Sudarshan Courtesy of the University of Texas at Austin
Newton claimed he had only gained his perspective because he "stood on the shoulders of giants." Had the Nobel Prize been around in his day, when Sir Isaac won—as he undoubtedly would have—he might have found himself standing atop some disgruntled giants who didn't get a share of his prize.
E.C. George Sudarshan, a physics professor at the University of Texas at Austin, is the grumbling giant of 2005.
In early October, the Royal Swedish Academy awarded the Nobel Prize in physics to three scientists for their work in quantum optics. Roy J. Glauber, a Harvard physics professor, was the lone theoretician honored. His research describes the behavior of light using quantum mechanics, paving the way for the field of quantum optics. Glauber's achievement, according to the Nobel citation, "served to bring out the distinction between the behavior of thermal light sources," like light bulbs, and "sources such as lasers."
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Though quantum mechanics dictates that sometimes light acts like a wave and sometimes it acts like a particle, physicists in the early part of the 20th century used only classical optics to describe the behavior of photons, conceiving of them as pool balls ricocheting about. Classical explanations, however, could not explain certain behaviors exhibited by bunches of photons. In a 1963 paper, Glauber laid the foundation for a quantum-mechanical explanation, which, that same year, Sudarshan extended to explain any quantum state of light. The theory is referred to as the "Glauber-Sudarshan representation" in the Nobel citation.
Sudarshan and a small group of physicists have written letters to the Nobel Committee claiming that the representation is actually more "Sudarshan" than "Glauber." Last Saturday, Ranjit Nair, director of India's Centre for Philosophy and Foundations of Science, sent a letter signed by 10 scientists to the Nobel Committee for Physics. The letter called the oversight of Sudarshan's "fundamental contributions" a "grave miscarriage of justice."
The letter goes on to say that Glauber criticized Sudarshan's theory—before renaming it the "P representation" and incorporating it into his own work.
The Nobel citation acknowledges that Sudarshan took Glauber's work to the next level, but says that Glauber's initial step toward a quantum-mechanical description of light appeared first, months before Sudarshan's.
Sudarshan began the letter-writing fray shortly after the Nobel Prize in physics was announced on October 4th. In an unpublished letter to the New York Times, Sudarshan calls the "Glauber-Sudarshan representation" a misnomer, adding that "literally all subsequent theoretic developments in the field of Quantum Optics make use of" Sudarshan's work— essentially, asserting that he had developed the breakthrough. However, the two have cited one another in momentous papers; other physicists cast both as quantum optics trailblazers.
When the Nobel Prize was created in 1901, collaboration and overlapping work was less common. With the prize limited to three recipients—and only one theoretician this year—Nobel spats are bound to become more frequent.
Even since the early days, conferring the Nobel has been an imperfect science. The omission of Lise Meitner from the 1945 Nobel Prize, awarded for the discovery of fission, is widely recognized as a mistake. Even Einstein had to wait years for his Nobel—and he never won for relativity.
In response to the letter-writing campaign on behalf of Sudarshan, Gunnar Öquist, secretary general of the Swedish Academy, sent e-mails telling the protestors that he has "taken note of the appeal," but that he could say no more. Though the Nobel proceedings are secret, some colleagues report rumors that Sudarshan was on the short list of physics recipients. Jonas Förare, a spokesman at the Swedish Academy, said that letters disputing the annual prize do come in "from time to time."