Curated from MIT Technology Review — Here’s what matters right now:
Growing up in South Central Los Angeles, Junior Peña learned to keep his eyes down and his schedule full. In his neighborhood, a glance could invite trouble, and many kids—including his older brother—were pulled into gang culture. He knew early on that he wanted something else. With his parents working long hours, he went to after-school programs, played video games, and practiced martial arts. But his friends had no idea that he also spent hours online poring over textbooks and watching lectures, teaching himself advanced mathematics and philosophy. “Being good at school wasn’t how people saw me,” he says. One night in high school, he came across a YouTube video about the Higgs boson—the so-called “God particle,” thought to give mass to nearly everything in the universe. “I remember my mind being flooded with questions about life, the universe, and our existence,” he recalls. He’d already looked into philosophers’ answers to those questions but was drawn to the more concrete explanations of physics. After his independent study helped Peña pass AP calculus as a junior, his fascination with physics led him to the University of Southern California, the 2019 session of MIT’s Summer Research Program, and then MIT for grad school. Today, he’s working to shed light on neutrinos, the ghostly uncharged particles that slip effortlessly through matter. Particles that would require a wall of lead five light-years thick to stop. As a grad student in the lab of Joseph Formaggio, an experimental physicist known for pioneering new techniques in neutrino detection, Peña works alongside leading physicists designing technology to precisely measure what are arguably the universe’s most elusive particles. Emanating from such sources as the sun and supernovas (and generated artificially by particle accelerators and nuclear reactors), neutrinos reveal their presence through an absence. Their existence was initially posited in the 1930s by the physicist Wolfgang Pauli, who noticed that energy seemed to go missing when atoms underwent a process known as radioactive beta decay. According to the law of conservation of energy, the total energy of the particles emitted during radioactive decay must equal the energy of the decaying atom. To account for the missing energy, Pauli proposed the existence of an undetectable particle that was carrying it away. Einstein’s E = mc 2 tells us that if energy is missing, then mass must be too. Yet according to the standard model of physics—which offers our most trusted theory for how particles behave—neutrinos should have no mass at all. Unlike other particles, they don’t interact with the Higgs field, a kind of cosmic molasses that slows particles down and gives them mass. Because they pass through it untouched, they should remain massless. But by the early 2000s, researchers had discovered that neutrinos, which had first been detected in the 1950s, can shift between three types, a feat possible only if they have mas
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Original reporting: MIT Technology Review