5 papers · 1 filter
A Compact Story of Positivity in de Sitter
Priyesh Chakraborty, Timothy Cohen, Daniel Green +1
Recent developments have yielded significant progress towards systematically understanding loop corrections to de Sitter (dS) correlators. In close analogy with physics in Anti-de…
Soft Metric Fluctuations During Inflation
Daniel Green, Kshitij Gupta
The conservation of the long wavelength fluctuations of the metric plays a vital role in cosmology as the link between quantum fluctuations during inflation and late time observati…
Operator Origin of Anomalous Dimensions in de Sitter Space
Timothy Cohen, Daniel Green, Yiwen Huang
The late time limit of the power spectrum for heavy (principal series) fields in de Sitter space yields a series of polynomial terms with complex scaling dimensions. Such scaling b…
A Goldstone Boson Equivalence for Inflation
Daniel Green, Kshitij Gupta, Yiwen Huang
The effective field theory of single-field inflation characterizes the inflationary epoch in terms of a pattern of symmetry breaking. An operator acquires a time-dependent vacuum e…
Positivity from Cosmological Correlators
Daniel Green, Yiwen Huang, Chia-Hsien Shen +1
Effective field theories in flat space and in anti-de Sitter space are constrained by causality and unitarity, often in the form of positivity bounds. Similar bounds have been hard…