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Positivity vs. Lorentz-violation: an explicit example
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DOI：10.1088/1475-7516/2021/10/079.png)
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We show how a class of multi-field scalar-field theories in a Lorentz-breaking background imposes consistency conditions on its effective theory of a single field and provides an example of order-unity violation of a naively applied positivity bound, assuming a large hierarchy between the masses of the lightest field and the others.
Keyword:
cosmological perturbation theory
gravity
modified gravity
期刊
IF:
5.9
论文数:
1.3W
被引数:
4.7W
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