78 citations · 336 across the 23 of their papers we have counts for
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On the absence of the Boulware-Deser ghost in novel graviton kinetic terms
Wenliang Li
Using novel nonlinear kinetic terms for gravitons, a large class of bi-gravity models were constructed, which are potentially free of the Boulware-Deser (BD) ghost. In this work, w…
Unifying Ghost-Free Lorentz-Invariant Lagrangians
Wenliang Li
We present the details of the novel framework for Lagrangian field theories that are Lorentz-invariant and lead to at most second order equations of motion. The use of antisymmetri…
A unifying framework for ghost-free Lorentz-invariant Lagrangian field theories
Wenliang Li
We propose a framework for Lorentz-invariant Lagrangian field theories where Ostrogradsky's scalar ghosts could be absent. A key ingredient is the generalized Kronecker delta. The…
Novel nonlinear kinetic terms for gravitons
Wenliang Li
A set of novel derivative terms for spin-2 fields are proposed. They are the wedge products of curvature two-forms and vielbeins. In this work, we investigate the properties of nov…