The phrase "a prevalent theory" is correct and usable in written English.
It can be used to describe a theory that is widely accepted or commonly held within a particular field or context.
Example: "In the scientific community, a prevalent theory suggests that climate change is primarily driven by human activities."
Alternatives: "a widely accepted theory" or "a common theory".
As the BBC notes, a prevalent theory is that dogs became domestic creatures once humans settled into agricultural-based communities.
This view contradicted Lamarck's theory of acquired characteristics, which was a prevalent theory of heredity of the time.
A prevalent theory in kink communities is that BDSM creates a sandbox or play space around impulses that have their roots in sexism or other prejudice, consensually mirroring non-consensual societal power dynamics.
Such a core jibes with a prevalent theory that the moon was conceived when a giant object crashed into the young Earth and blasted material into our planet's orbit.
A prevalent theory had it that the title is related to David Ogilvy, the British advertising guru who published the classic "Confessions of An Ad Man" in 1963.
A prevalent theory in the field is that AD is caused primarily by Aβ deposition within the brain, which leads to an increased production of reactive oxygen species (ROS), oxidative damage, mitochondrial dysfunction and cell death [5], [6], [7], [8], [9].
A related and more prevalent theory was that Hoover scholars had inadvertently scotched the visit by boasting in American newspaper interviews that Mr. Gorbachev was coming to them for lessons in democracy and capitalism.
Badly needed a rest stop, is the prevalent theory.
The prevalent theory for how a mid-plate volcano forms is that a single upwelling of hot, buoyant rock rises vertically as a plume from deep within Earth's mantle – the layer found between the planet's crust and core – and supplies the heat to feed volcanic eruptions.
Lieberman's comments go a long way toward validating the prevalent theory in progressive blogger circles -- that he, as the Washington Post's Ezra Klein put it, "seems primarily motivated by torturing liberals".
Now, after talking with more people, Mr. Paris said, "The more accurate and prevalent theory is that an alert can delay or prohibit you from getting new credit, but it's not going to affect your score per se".
