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Search: authors:"Daniel Baumann"

6 papers found.
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Non-Gaussianity as a particle detector

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 particles to the Goldstone boson of broken time translations and the graviton. We show that it is possible to generate observable non-Gaussianity within the regime of validity of the effective theory...

High-scale inflation and the tensor tilt

In this paper, we explore a novel observational signature of gravitational corrections during slow-roll inflation. We study the coupling of the inflaton field to higher-curvature tensors in models with a minimal breaking of conformal symmetry. In that case, the most general correction to the tensor two-point function is captured by a coupling to the square of the Weyl tensor. We...

On the correspondence between barrier crossing, peak-background split and local biasing

Several, apparently distinct, formalisms exist in the literature for predicting the clustering of dark matter haloes. It has been noticed on a case-by-case basis that the predictions of these different methods agree in specific examples, but the precise correspondence remains unclear. In this paper, we provide a simple mathematical relationship between barrier crossing, peak...

D3-brane potentials from fluxes in AdS/CFT

We give a comprehensive treatment of the scalar potential for a D3-brane in a warped conifold region of a compactification with stabilized moduli. By studying general ultraviolet perturbations in supergravity, we systematically incorporate ‘compactification effects’ sourced by supersymmetry breaking in the compact space. Significant contributions to the D3-brane potential...

A universe that changes its symmetry

We explore the development of galaxy clustering after an extremely long time in a flat Einstein–de Sitter universe. The time-scale for growth of clustering in this universe is shorter than the global expansion time-scale. This eventually leads to a single cluster of arbitrary large size, which dominates each expanding particle horizon. Since the particle horizons expand faster...