From amplitudes to contact cosmological correlators
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Publication:825611
DOI10.1007/JHEP10(2021)001zbMATH Open1476.85011arXiv2106.15468WikidataQ114021589 ScholiaQ114021589MaRDI QIDQ825611
Author name not available (Why is that?)
Publication date: 17 December 2021
Published in: (Search for Journal in Brave)
Abstract: Our understanding of quantum correlators in cosmological spacetimes, including those that we can observe in cosmological surveys, has improved qualitatively in the past few years. Now we know many constraints that these objects must satisfy as consequences of general physical principles, such as symmetries, unitarity and locality. Using this new understanding, we derive the most general scalar four-point correlator, i.e., the trispectrum, to all orders in derivatives for manifestly local contact interactions. To obtain this result we use techniques from commutative algebra to write down all possible scalar four-particle amplitudes without assuming invariance under Lorentz boosts. We then input these amplitudes into a contact reconstruction formula that generates a contact cosmological correlator in de Sitter spacetime from a contact scalar or graviton amplitude. We also show how the same procedure can be used to derive higher-point contact cosmological correlators. Our results further extend the reach of the boostless cosmological bootstrap and build a new connection between flat and curved spacetime physics.
Full work available at URL: https://arxiv.org/abs/2106.15468
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