All Outputs (4)

Gravitational mechanisms to self-tune the cosmological constant: obstructions and ways forward (2017)
Journal Article
Niedermann, F., & Padilla, A. (2017). Gravitational mechanisms to self-tune the cosmological constant: obstructions and ways forward. Physical Review Letters, 119(25), Article 251306. https://doi.org/10.1103/PhysRevLett.119.251306

Gravitational models of self-tuning are those in which vacuum energy has no observable effect on spacetime curvature, even though it is a priori unsuppressed below the cut-off. We complement Weinberg's no go theorem by studying field theoretic comple... Read More about Gravitational mechanisms to self-tune the cosmological constant: obstructions and ways forward.

An étude on global vacuum energy sequester (2017)
Journal Article
D’Amico, G., Kaloper, N., Padilla, A., Stefanyszyn, D., Westphal, A., & Zahariade, G. (2017). An étude on global vacuum energy sequester. Journal of High Energy Physics, 2017(9), Article 74. https://doi.org/10.1007/JHEP09%282017%29074

Recently two of the authors proposed a mechanism of vacuum energy sequester as a means of protecting the observable cosmological constant from quantum radiative corrections. The original proposal was based on using global Lagrange multipliers, but la... Read More about An étude on global vacuum energy sequester.

Probing scalar effective field theories with the soft limits of scattering amplitudes (2017)
Journal Article
Padilla, A., Stefanyszyn, D., & Wilson, T. (2017). Probing scalar effective field theories with the soft limits of scattering amplitudes. Journal of High Energy Physics, 2017(4), https://doi.org/10.1007/JHEP04%282017%29015

We investigate the soft behaviour of scalar effective field theories (EFTs) when there is a number of distinct derivative power counting parameters, ?1 < ?2 < . . . < ?Q. We clarify the notion of an enhanced soft limit and use these to extend the sco... Read More about Probing scalar effective field theories with the soft limits of scattering amplitudes.

Vacuum energy sequestering and graviton loops (2017)
Journal Article
Kaloper, N., & Padilla, A. (2017). Vacuum energy sequestering and graviton loops. Physical Review Letters, 118(6), Article 061303. https://doi.org/10.1103/PhysRevLett.118.061303

We recently formulated a local mechanism of vacuum energy sequester. This mechanism automatically removes all matter loop contributions to vacuum energy from the stress energy tensor which sources the curvature. Here we adapt the local vacuum energy... Read More about Vacuum energy sequestering and graviton loops.