The largest global survey of physicists ever conducted has revealed just how unsettled some of the biggest questions in modern physics remain. Researchers found surprisingly little agreement on topics ranging from black holes and dark matter to the long-running effort to reconcile Einstein's theory of gravity with quantum mechanics. Even the standard model of cosmology, known as ΛCDM (Lambda Cold Dark Matter), failed to win support from a majority of respondents.
That result may reflect recent findings from the Dark Energy Spectroscopic Instrument (DESI), which suggested that dark energy could change over time. Such a possibility would conflict with the standard model, which assumes that dark energy remains constant. And cosmology was far from the only area where physicists disagreed.
Standard Answers Fail To Win Broad Support "The most striking result is how few of the 'standard answers' in fundamental physics command overwhelming support, with most falling short of a majority. The interesting point is not that physicists are confused. It is that the frontier is genuinely alive," says Niayesh Afshordi, associate faculty member at Perimeter Institute and professor at the University of Waterloo.
Afshordi led the study with coauthor Phil Harper and the American Physical Society's Physics Magazine. Across the questions included in the survey, only two received majority agreement. One concerned the Big Bang.
Despite the way it is often portrayed in popular culture, 68% of the physicists surveyed said the Big Bang does not necessarily represent the beginning of time. Instead, the theory describes how the universe developed from an extremely hot and dense state. It does not, by itself, explain whether time had an absolute beginning.
The second point to cross the majority threshold was cosmic inflation. Just 51% agreed that the early universe experienced an extremely rapid period of expansion known as inflation. On many other major questions, the responses were much more divided.
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