'optimistic hypothesis' is a perfectly valid phrase in written English.
You could use it when describing a theory that has yet to be fully proven, but which appears to be backed-up by existing evidence. For example: "In light of recent findings, the professor put forward an optimistic hypothesis that climate change could be reversible through collective action."
Among the psychologists who study bigotry and ethnic conflict, this optimistic theory is known as the "contact hypothesis".
However, the protocol mechanisms of TTP/C rely on a rather optimistic fault hypothesis.
We could not show non-inferiority of alternative regimens, but we believe our findings are influenced by the over-optimistic working hypothesis of 80% viral success (50 copies/ml) for the standard regimen which was not reached (69% in the control group).
It should be noted that this hypothesis is optimistic but it can, however, be seen as a reasonable investment cost in a few years from now [15].
Findings for first-day market-adjusted return support the information asymmetry hypothesis overly optimistic investors bid up prices, generating higher initial returns, and prices decline as they moderate their enthusiasm, resulting in subsequent underperformance (Ritter 1991; Kooli et al. 2006).
a This hypothesis is very optimistic, but it is taken by many research works in the literature.
This result supports the information asymmetry hypothesis that overly optimistic investors misvalue stock prices, thereby earning higher initial returns but prompting long-run underperformance.
This revised hypothesis represents an optimistic, inverted interpretation of double demotivation theory (Carr 1996), which predicts that by bridging between professions boundary objects will transform at least one of the professions involved.
The hypothesis of this optimistic scenario is that patients would actually access the nearest structures.
