Why is the Weyl tensor square gravity non-unitary?

Asked4 years, 6 months ago

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I want to understand constraints of unitarity in quantum field theory. There is quite folklore statement:

gravity with a Weyl tensor square term is non-unitary

How to understand this? (I think that it is quite simple, because we rarely prove unitarity and it directly follows from action)

How to modify theory to obtain unitary theory?

edited Oct 4, 2020 at 23:00

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asked Oct 1, 2020 at 18:27

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$\begingroup$Pretty interesting question. Do you have a reference with an example of this statement?$\endgroup$
– Ramiro Hum-Sah
CommentedNov 3, 2020 at 1:56
1
$\begingroup$@RamiroHum-Sah, en.m.wikipedia.org/wiki/Conformal_gravity$\endgroup$
– Nikita
CommentedNov 3, 2020 at 8:05

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