The phrase "audacious theory" is correct and usable in written English.
It can be used to describe a theory that is bold, daring, or unconventional, often challenging established norms or beliefs.
Example: "The scientist proposed an audacious theory that contradicted decades of research in the field."
Alternatives: "bold hypothesis" or "daring concept".
That is one of the typically audacious and brilliant theories put forth by Professor Bloom in his latest book, The Daemon Knows.
At the age of 27, he and a colleague, John Conway, formulated an audacious conjecture in group theory called "monstrous moonshine," which inspired a frenzy of mathematical work around the globe that culminated in a Fields Medal-winning proof by Richard Borcherds almost two decades later.
At these moments, using techniques that might have seemed audacious to an undergraduate literary theory class in 1985 or so, the film calls attention to its own artificial status.
And then, after he's diagnosed with motor-neurone disease, as the audacious genius of space-time theory whose mind only grows more infinite as his body crumples up, his head hanging off his neck, his limbs twisted and useless, his mouth contorting itself around the words (and that's when he can still speak).
This was an audacious move, since there was no suitable theory of algebraic topology available, but Weil conjectured what results it should yield.
"The String Theory Quartet," his sophomore effort, is no less audacious than its predecessor.
The Bush administration is currently engaged in an audacious -- some would say reckless -- experiment to disprove this theory.
Darwin freely admitted that the veracity of his audacious proposal would have to withstand paleontological scrutiny and that his theory would collapse in the absence of transitional fossil forms.
Nozick's always lively, engaging, audacious, and philosophically ambitious writings revealed an amazing knowledge of advanced work in many disciplines including decision theory, economics, mathematics, physics, psychology, and religion.
