Global survey finds physicists split on dark matter, quantum gravity

September 13, 2026 at 06:16 PM2 min

This digest was compiled by AI from multiple sources — links to the originals are below.

The largest global survey of physicists found no majority support for the standard model of cosmology, ΛCDM. Only two of the survey's questions received majority agreement: 68% said the Big Bang does not necessarily mark the beginning of time, and 51% endorsed cosmic inflation. Dark matter and quantum gravity showed deep divisions, with no single theory favored by more than 21% of respondents.

Key Facts

The survey was led by Niayesh Afshordi of Perimeter Institute and the University of Waterloo, with coauthor Phil Harper and the American Physical Society's Physics Magazine.
68% of surveyed physicists said the Big Bang does not necessarily represent the beginning of time.
Only 51% agreed that the early universe experienced a rapid expansion known as inflation.
For dark matter, 17% favored undiscovered low-mass particles, 12% supported modified gravity, and 21% favored a combination of explanations.
For quantum gravity, string theory received 19% support, loop quantum gravity 12%, and 18% said gravity cannot be quantized.

Survey Scope and Method

The study is described as the largest global survey of physicists ever conducted. Researchers found little agreement on topics ranging from black holes and dark matter to reconciling Einstein's gravity with quantum mechanics. Even the standard model of cosmology, ΛCDM, failed to win support from a majority of respondents. This result may reflect recent findings from the Dark Energy Spectroscopic Instrument (DESI), which suggested dark energy could change over time.

Dark Matter and Quantum Gravity Divisions

On dark matter, only 17% favored the idea that it is made of a yet undiscovered low-mass particle or particles. Another 12% supported modifications to the theory of gravity, while the largest single group, at 21%, favored some combination of proposed explanations. For quantum gravity, string theory received the most support at 19%, loop quantum gravity received 12%, and 18% favored the possibility that gravity cannot be quantized at all. The results show that after decades of theoretical work, no single approach has emerged as the dominant answer.