A What quantum effects that involve gravity can be studied without QFT?

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So there is no a full quantum theory of gravitation. However, there are instances where quantum effects due to gravitation have been studied. Like Gravitational neutron interferometry https://arxiv.org/pdf/1701.00259.pdf or maybe gravitational decoherence https://www.nature.com/articles/nphys3366

I would like to know if there are others quantum effects that involve gravity that can (at least in an approximate way) be studied without a full quantization of gravity.
 

Demystifier

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Hawking radiation, for instance. It requires QFT, but not quantum gravity.
 
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Hawking radiation
I'm not sure this is a good example, since it hasn't been observed, so we don't actually know if our current predictions about it are correct.
 

vanhees71

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There are proposals for observing the quantum nature of the gravitational field

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On the other hand, I liked this paper on the equivalence principle in QM


I wonder if there are papers that work the case of general curved space time.
 

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