The phrase "abstract speculations" is correct and usable in written English.
It can be used when discussing theoretical ideas or conjectures that are not grounded in concrete evidence or reality.
Example: "The philosopher's paper was filled with abstract speculations about the nature of existence and consciousness."
Alternatives: "theoretical conjectures" or "hypothetical musings".
He engaged in little abstract speculation, concentrating instead on a concrete, unsentimental depiction.
They share a metabolic intolerance for the great French indoor sport of abstract speculation.
Such abstract speculation gave rise to drawings and models for buildings and furnishings.
After World War II, however, French writers appeared to take on a zest for abstract speculation, for turgid prose, and for the coining of abstruse terms.
His own poems (and many of the speeches of the heroes in his plays) repeatedly threaten to lose themselves in abstract speculation and syntactic involution.
The past whispers its instructions to him, not via critical reflection or abstract speculation but through the things he's already doing more or less automatically.
While at home recuperating from an eye injury, writer thought he might explore the inner reaches of consciousness, and had fantasies of indulging in abstract speculation in the manner of a minor Kant or amateur Einstein.
And the ratio of action to abstract speculation feels rather low at times, especially in the first volume, where the ruminative passages often seem to expand more by repetition and tautology than the actual development of a thought.
He was an acute critic and arguer, with an exceptional degree of intellectual honesty for his, or any, period; philosophy for him was not only a matter of abstract speculation but also a way of life in which, through an exacting intellectual and moral self-discipline and purification, those who are capable of the ascent can return to the source from which they came.
Unfortunately, they're opining on topics like "where poems come from," and this is exactly the kind of abstract speculation that summons forth Magical Poetry Talk — comments that make poetry sound like God's own electric Kool-Aid acid test — from even the smartest writers.
