# CFTs Blueshift Tensor Fluctuations Universally

@inproceedings{Baumgart2021CFTsBT, title={CFTs Blueshift Tensor Fluctuations Universally}, author={Matthew Baumgart and Jonathan J. Heckman and Logan Thomas}, year={2021} }

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…

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