The phrase "longstanding theory" is grammatically correct and commonly used in written English.
It means a theory that has existed or been accepted for a long time. Example: The longstanding theory of evolution has been widely debated and studied by scientists for centuries.
The discovery has already begun challenging longstanding theory about how those interactions evolve.
Yet the star appears to defy this longstanding theory, so new theories may need to be formed, Dr. Bonifacio said.
My longstanding theory is that you can tell a lot about a country's approach to power and equality by watching how drivers treat those on foot.
Partly because it would confirm my longstanding theory that no matter how great the political divide between the parties, the biggest hate-hate relationship in Washington is the chasm of loathing between the House and the Senate.
Contradicting a longstanding theory that the jogger had been gang-raped, the report said that an 11-month re-examination of the case had found DNA and other persuasive evidence that the woman had been brutally beaten, raped and left for dead by one man, Matias Reyes, a murderer and serial rapist who confessed last January that he alone had attacked the jogger.
I was at roughly 25 of his shows, mostly as a deeply obsessed teenager, but at quite a few as an adult, too, and now I was sitting in that booth in the Algonquin pestering him about a longstanding theory of mine: that there is something in his music — caustic, smart, fast-talking, but with moments of deep compassion and sublime beauty — that is quintessentially New York.
By the end, some longstanding theories have been debunked.
They have also resulted in him questioning some longstanding theories about asthma, including the ideas that symptoms occur primarily at home and that the affliction is more prevalent in urban areas than rural ones.
One of Torre's longstanding theories is that Martinez thought a lot about numbers after slugging 44 homers in 1997, that he felt the need to repeat those numbers.
From high energy physics to cosmology, biology, and genetics, sophisticated instrumentation, massive, high throughput experiments and observatories are increasingly leveraged by scientists and scholars to empirically validate deep, longstanding theories [3 5].
In 1994 two historians, together with several descendants, sought a court order for the exhumation of Booth's body at Green Mount Cemetery, which was, according to their lawyer, "intended to prove or disprove longstanding theories on Booth's escape" by conducting a photo-superimposition analysis.
