82 citations · 311 across the 9 of their papers we have counts for
9 papers
Dark energy loopholes some time after GW170817
Lorenzo Bordin, Edmund J. Copeland, Antonio Padilla
We revisit the constraints on scalar tensor theories of modified gravity following the purge of GW170817. We pay particular attention to dynamical loopholes where the anomalous spe…
Compact object scalarization with general relativity as a cosmic attractor
Georgios Antoniou, Lorenzo Bordin, Thomas P. Sotiriou
We demonstrate that there are theories that exhibit spontaneous scalarization in the strong gravity regime while having General Relativity with a constant scalar as a cosmological…
Graviton non-Gaussianities and Parity Violation in the EFT of Inflation
Lorenzo Bordin, Giovanni Cabass
We study graviton non-Gaussianities in the EFT of Inflation. At leading (second) order in derivatives, the graviton bispectrum is fixed by Einstein gravity. There are only two cont…
A natural theory of dark energy
Lorenzo Bordin, Francesc Cunillera, Antoine Lehébel +1
We propose a mechanism that generates a naturally light dark energy field (with Hubble scale mass), starting from a theory with exclusively high scale (Planckian) couplings. It is…
Probing higher-spin fields from inflation with higher-order statistics of the CMB
Lorenzo Bordin, Giovanni Cabass
We investigate the degree to which the Cosmic Microwave Background (CMB) can be used to constrain primordial non-Gaussianity coming from the presence of spinning particles coupled…
Light Particles with Spin in Inflation
Lorenzo Bordin, Paolo Creminelli, Andrei Khmelnitsky +1
The existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with…
Simplifying the EFT of Inflation: Generalized Disformal Transformations and Redundant Couplings
Lorenzo Bordin, Giovanni Cabass, Paolo Creminelli +1
We study generalized disformal transformations, including derivatives of the metric, in the context of the Effective Field Theory of Inflation. All these transformations do not cha…
Solid Consistency
Lorenzo Bordin, Paolo Creminelli, Mehrdad Mirbabayi +1
We argue that scalar fluctuations in solid inflation are adiabatic in the super-horizon limit. During the solid phase this adiabatic mode has peculiar features: constan…
Tensor Squeezed Limits and the Higuchi Bound
Lorenzo Bordin, Paolo Creminelli, Mehrdad Mirbabayi +1
We point out that tensor consistency relations-i.e. the behavior of primordial correlation functions in the limit a tensor mode has a small momentum-are more universal than scalar…