212 citations · 666 across the 34 of their papers we have counts for
14 papers · 1 filter
Symmetries from Locality. II. Gravitation and Lorentz Boosts
Mark P. Hertzberg, Jacob A. Litterer, McCullen Sandora
It is known that local, Lorentz invariant, unitary theories involving particles with spin 1 demand that the matter sector they couple to are organized by internal physical symmetri…
Quantum Fine-Tuning in Stringy Quintessence Models
Mark P. Hertzberg, McCullen Sandora, Mark Trodden
We investigate the extent to which quintessence models for dark energy are fine-tuned in the context of recent swampland conjectures. In particular, the issue is whether there is a…
Is Patience a Virtue? Cosmic Censorship of Infrared Effects in de Sitter
Ricardo Z. Ferreira, McCullen Sandora, Martin S. Sloth
While the accumulation of long wavelength modes during inflation wreaks havoc on the large scale structure of spacetime, the question of even observability of their presence by any…
Special Relativity from Soft Gravitons
Mark P. Hertzberg, McCullen Sandora
We study all translationally and rotationally invariant local theories involving massless spin 2 and spin 1 particles that mediate long range forces, allowing for general energy re…
Patient Observers and Non-perturbative Infrared Dynamics in Inflation
Ricardo Z. Ferreira, McCullen Sandora, Martin S. Sloth
We have previously derived the effect of soft graviton modes on the quantum state of de Sitter using spontaneously broken asymptotic symmetries. In the present paper we reinterpret…
General Relativity from Causality
Mark P. Hertzberg, McCullen Sandora
We study large families of theories of interacting spin 2 particles from the point of view of causality. Although it is often stated that there is a unique Lorentz invariant effect…
Asymptotic Symmetries in de Sitter and Inflationary Spacetimes
Ricardo Z. Ferreira, McCullen Sandora, Martin S. Sloth
Soft gravitons produced by the expansion of de Sitter can be viewed as the Nambu-Goldstone bosons of spontaneously broken asymptotic symmetries of the de Sitter spacetime. We expli…
Spinodal Backreaction During Inflation and Initial Conditions
Benoit J. Richard, McCullen Sandora
We investigate how long wavelength inflationary fluctuations can cause the background field to deviate from classical dynamics. For generic potentials, we show that, in the Hartree…
Radiative Corrections from Heavy Fast-Roll Fields during Inflation
Rajeev Kumar Jain, McCullen Sandora, Martin S. Sloth
We investigate radiative corrections to the inflaton potential from heavy fields undergoing a fast-roll phase transition. We find that a logarithmic one-loop correction to the infl…
Covariant constraints for generic massive gravity and analysis of its characteristics
S. Deser, M. Sandora, A. Waldron +1
We perform a covariant constraint analysis of massive gravity valid for its entire parameter space, demonstrating that the model generically propagates five degrees of freedom; thi…
Spherical Cows in the Sky with Fab Four
Nemanja Kaloper, McCullen Sandora
We explore spherically symmetric static solutions in a subclass of unitary scalar-tensor theories of gravity, called the `Fab Four' models. The weak field large distance solutions…
No consistent bimetric gravity?
S. Deser, M. Sandora, A. Waldron
We discuss the prospects for a consistent, nonlinear, partially massless (PM), gauge symmetry of bimetric gravity (BMG). Just as for single metric massive gravity, we show that con…
Nonlinear Partially Massless from Massive Gravity?
S. Deser, M. Sandora, A. Waldron
We show that consistent nonlinear Partially Massless models cannot be obtained starting from "f-g" massive gravity, with "f" the embedding de Sitter space. The obstruction, which i…
Topological Ghosts: the Teeming of the Shrews
Nemanja Kaloper, McCullen Sandora
We consider dynamics of spacetime volume-filling form fields with "wrong sign" kinetic terms, such as in so-called Type-II string theories. Locally, these form fields are just…