234 citations · 1.2k across the 25 of their papers we have counts for
15 papers · 1 filter
Higher-Spin Correlators in dS
Shounak De, Hayden Lee
We study momentum-space correlators in minimal higher-spin gravity in using its holographic vector-model description. Connected -point functions in this model ar…
The Vasiliev Grassmannian
Shounak De, Hayden Lee
We express the scalar four-point function of minimal Vasiliev higher-spin gravity in de Sitter space as an integral over the orthogonal Grassmannian OGr(4,8). The full crossing-sym…
Constraints on Long-Range Forces in De Sitter Space
Daniel Baumann, Kurt Hinterbichler, Callum R. T. Jones +4
The representation theory of de Sitter space admits partially massless (PM) particles, but whether such particles can participate in consistent interacting theories remains unclear…
Geometry of Kinematic Flow
Daniel Baumann, Harry Goodhew, Austin Joyce +3
We uncover a geometric organization of the differential equations for the wavefunction coefficients of conformally coupled scalars in power-law cosmologies. To do this, we introduc…
A species scale-driven breakdown of effective field theory in time-dependent string backgrounds
Alek Bedroya, Hayden Lee, Paul Steinhardt
We present a novel way in which effective field theory (EFT) can break down in cosmological string backgrounds depending on the behavior of the quantum gravity cutoff in infinite d…
Kinematic Flow for Cosmological Loop Integrands
Daniel Baumann, Harry Goodhew, Hayden Lee
Recently, an interesting pattern was found in the differential equations satisfied by the Feynman integrals describing tree-level correlators of conformally coupled scalars in a po…
Kinematic Flow and the Emergence of Time
Nima Arkani-Hamed, Daniel Baumann, Aaron Hillman +3
Perhaps the most basic question we can ask about cosmological correlations is how their strength changes as we smoothly vary kinematic parameters. The answer is encoded in differen…
Differential Equations for Cosmological Correlators
Nima Arkani-Hamed, Daniel Baumann, Aaron Hillman +3
Cosmological fluctuations retain a memory of the physics that generated them in their spatial correlations. The strength of correlations varies smoothly as a function of external k…
Linking the Singularities of Cosmological Correlators
Daniel Baumann, Wei-Ming Chen, Carlos Duaso Pueyo +3
Much of the structure of cosmological correlators is controlled by their singularities, which in turn are fixed in terms of flat-space scattering amplitudes. An important challenge…
The Cosmological Bootstrap: Spinning Correlators from Symmetries and Factorization
Daniel Baumann, Carlos Duaso Pueyo, Austin Joyce +2
We extend the cosmological bootstrap to correlators involving massless particles with spin. In de Sitter space, these correlators are constrained both by symmetries and by locality…
The Cosmological Bootstrap: Weight-Shifting Operators and Scalar Seeds
Daniel Baumann, Carlos Duaso Pueyo, Austin Joyce +2
A key insight of the bootstrap approach to cosmological correlations is the fact that all correlators of slow-roll inflation can be reduced to a unique building block---the four-po…
The Cosmological Bootstrap: Inflationary Correlators from Symmetries and Singularities
Nima Arkani-Hamed, Daniel Baumann, Hayden Lee +1
Scattering amplitudes at weak coupling are highly constrained by Lorentz invariance, locality and unitarity, and depend on model details only through coupling constants and particl…
Partially Massless Fields During Inflation
Daniel Baumann, Garrett Goon, Hayden Lee +1
The representation theory of de Sitter space allows for a category of partially massless particles which have no flat space analog, but could have existed during inflation. We stud…
Non-Gaussianity as a Particle Detector
Hayden Lee, Daniel Baumann, Guilherme L. Pimentel
We study the imprints of massive particles with spin on cosmological correlators. Using the framework of the effective field theory of inflation, we classify the couplings of these…
Signs of Analyticity in Single-Field Inflation
Daniel Baumann, Daniel Green, Hayden Lee +1
The analyticity of response functions and scattering amplitudes implies powerful relations between low-energy observables and the underlying short-distance dynamics. These 'IR/UV'…