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- W3199889968 abstract "Abstract The strong constraints of conformal symmetry cause any nearly-conformal sector to blueshift tensor fluctuations in cosmology. Hidden sectors with approximate conformal symmetry, which may be quite large, are a well-motivated extension of physics beyond the Standard Models of particle physics and cosmology. They can therefore lead to a detectable shift in the tensor tilt for next-generation CMB and gravitational wave experiments. We compute the leading-order contribution to the in-in graviton two-point function from virtual loops in such sectors to demonstrate this universal effect. In units where a single conformally-coupled scalar is 1, limits from Stage-IV CMB experiments could bound the size of this extra sector to be smaller than ∼10 15 , under a plausible calculational assumption backed by a simple power counting argument. This would be sufficient to rule out N-Naturalness as a complete resolution of the hierarchy problem." @default.
- W3199889968 created "2021-09-27" @default.
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- W3199889968 date "2022-07-01" @default.
- W3199889968 modified "2023-10-03" @default.
- W3199889968 title "CFTs blueshift tensor fluctuations universally" @default.
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- W3199889968 doi "https://doi.org/10.1088/1475-7516/2022/07/034" @default.
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