A large survey of views on open questions in fundamental physics found that most of the answers a general reader would assume are settled do not command a majority among the people who work on them. The standard model of cosmology drew well under half. So did every proposed identity for dark matter and every leading approach to quantum gravity.

The results were compiled by Niayesh Afshordi of the University of Waterloo and the Perimeter Institute, science communicator Phil Halper, and editors at the American Physical Society's Physics Magazine, which published them on May 12 alongside an online dashboard. More than 1,600 people responded, drawn from the magazine's readership and the society's membership. A correction issued on May 18 clarified that this is the largest survey to date focused specifically on physicists' views of open questions in physics, not the largest physics survey ever conducted. The correction cited a 2020 American Institute of Physics survey of more than 30,000 scientists, including 7,570 physicists, on careers and professional experiences.

Nature World News is revisiting the findings now because two lines of evidence bearing directly on the survey's central questions have moved since it closed, and because the results are being widely recirculated without their original date attached.

Two Questions Where Respondents Agreed

Only two items crossed the 50 percent threshold, and one of them corrects a common public misconception.

Around seven in ten respondents chose to describe the Big Bang as a hot, dense state without committing to whether it corresponds to an absolute beginning of time. The theory describes the universe expanding from an extremely hot and dense state. It does not by itself establish whether time had an absolute beginning, a distinction routinely lost in popular retellings.

The second was cosmic inflation, the proposed period of extremely rapid expansion in the early universe. Just over half of respondents, 51 percent, selected it as the best explanation of early-universe puzzles, a bare majority for an idea often presented to the public as standard.

Where the Field Splits

On dark matter, the responses scattered. The weakly interacting massive particle, long the clear front-runner, was picked by only 10 percent. Seventeen percent chose a light particle such as an axion. Around 21 percent said dark matter might be a hybrid combination of the proposed explanations, which amounts to declining to pick a single answer. On modified gravity the reported figures differ by how the options are grouped: the University of Waterloo's summary put support for a modification to the theory of gravity at 12 percent, while the Physics Magazine write-up put it at about 22 percent by counting modified Newtonian dynamics and quantum gravity together.

Dark energy was equally contentious. The cosmological constant, the traditional standard bearer, received only about 25 percent of the votes, finishing close behind or level with a time-varying scalar field.

Quantum gravity produced a similar spread. String theory led, but with under 20 percent support, and "no opinion" was the single most selected answer. In the Waterloo summary, string theory drew 19 percent, loop quantum gravity 12 percent, and the view that gravity cannot be quantized at all 18 percent. After decades of theoretical work, no approach has become dominant.

Taken together, the dark matter and dark energy results are why the standard cosmological model, known as Lambda Cold Dark Matter, failed to win majority support. The University of Waterloo and Perimeter Institute announcement attributes that outcome in part to results from the Dark Energy Spectroscopic Instrument, which hinted that dark energy may change over time, in opposition to the model's assumption that it remains constant.

Disagreement at a Frontier Is Not Disarray

The interpretation matters as much as the numbers, and it is easy to get wrong in two opposite directions. Reading this as a scandal misrepresents how science works at its edges. Reading it as evidence that established physics is unsound misrepresents it more seriously.

Nothing in the survey concerns settled physics. General relativity and quantum mechanics both pass precision tests routinely, and the survey did not ask about them. What it asked about are questions where the available evidence genuinely does not yet single out one answer.

"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," Afshordi said.

He was also explicit that a survey does not settle anything. "Scientific truth is not decided by a vote. But consensus, or its absence, tells us where the evidence feels settled and where researchers still see room for radically different ideas. In this sense, lack of consensus can be a clue. It marks places where better data, sharper theory, or new connections between subfields may be needed," Afshordi said, closing with a line from Leonard Cohen about a crack in everything being how the light gets in.

The Methodological Caveat, and What Could Break the Deadlock

The limitations are stated plainly. This was a voluntary online survey with self-selected respondents, not a random sample of a defined population. A little over 20 percent of participants identified themselves as science enthusiasts rather than researchers, with the rest reporting work in gravity, astrophysics, particle physics or another field of science. People who hold strong views on cosmology or quantum gravity had more reason to participate than those who work in condensed matter or optics. The percentages describe who answered, and the authors present them as a snapshot of opinion rather than a measurement of what the discipline believes. Full results are available in an arXiv e-print and through the Physics Magazine dashboard.

What would actually resolve these questions is observation, and several relevant results have emerged since the survey closed. A University of Queensland-led team posted a catalog of 2,884 Type Ia supernovae in early September that, when combined with cosmic microwave background and galaxy survey data, prefers a time-varying dark energy model over the standard one at between 2.5 and 3.1 sigma, as covered by Sci. News. That is short of the five-sigma threshold physics uses for a discovery, the preprint has not completed peer review, and the supernova catalog on its own remains consistent with dark energy that does not change.

On the dark matter side, the LUX-ZEPLIN experiment, which operates nearly a mile underground at the Sanford Underground Research Facility in South Dakota, reported a single particle interaction that researchers have had difficulty explaining with known backgrounds. The U.S. Department of Energy describes it as the most compelling hint of dark matter the experiment has reported so far, while noting that the result does not meet the statistical threshold required to claim a discovery. If the event were caused by dark matter, the particle would carry a mass of at least 200 times that of a proton.

NASA maintains an accessible overview of what is and is not established about dark matter and dark energy, which is a better starting point for readers than any single survey result. Further data from spectroscopic surveys, next-generation direct detection detectors and gravitational wave observatories will do the work that no poll can.

For readers, the practical takeaway is a habit rather than an action. When coverage describes something in fundamental physics as established, it is worth asking whether the claim sits in the well-tested core of the field or out at the frontier where this survey found respondents split three or four ways. Those are very different categories, and headlines rarely distinguish them.

What Readers Want to Know

What did the survey ask? Ten questions covering major open problems in cosmology, particle physics and general relativity, including dark matter, dark energy, black holes, quantum mechanics and quantum gravity.

How many people responded? More than 1,600, drawn from Physics Magazine's readership and American Physical Society members. The organizers describe it as the largest survey to date focused on physicists' views of open questions in physics.

Which questions drew majority agreement? Only two. Around seven in ten respondents said the Big Bang need not mark an absolute beginning of time, and 51 percent picked cosmic inflation as the best explanation of early-universe puzzles.

Does this mean established physics is in doubt? No. The survey covered frontier questions, not the well-tested core. General relativity and quantum mechanics were not the subject and continue to pass precision tests.

Why did the standard cosmological model fall short? The organizers point to Dark Energy Spectroscopic Instrument results suggesting dark energy may vary over time, which conflicts with the model's assumption that it stays constant.

What is the survey's biggest weakness? Respondents self-selected, and a little over 20 percent described themselves as science enthusiasts rather than researchers. The percentages reflect who chose to answer, not a random sample of the discipline.

When were the results published? In Physics Magazine on May 12, 2026, with a correction on May 18 narrowing the claim about the survey's scale. The findings have been widely recirculated since.