Multisensory integration is essential for maintenance of motor and cognitive abilities, thereby
ensuring normal function and personal autonomy. Balance control is challenged during …

Negative kinetic energies correspond to ghost degrees of freedom, which are potentially of
relevance for cosmology, quantum gravity, and high energy physics. We present a novel …

A bstract We investigate the evolution of localized initial value profiles when propagated in
integrable versions of higher time-derivative theories. In contrast to the standard cases in …

Local minima of the potential can be metastable up to cosmologically long times thanks to
energy conservation. We explore the possibility that theories with negative kinetic energy …

We study a free scalar field ϕ in a fixed curved background spacetime subject to a higher
derivative field equation of the form F (□) ϕ= 0, where F is a polynomial of the form F (□)=∏ …

We show a theorem proving that a non-local bosonic field upon a covariant interaction with a
confining gauge field undergoes the confinement of its degrees of freedom present in the …

We consider the general higher derivative field theories of derived type. At free level, the
wave operator of derived-type theory is a polynomial of the order n≥ 2 of another operator …

We discuss how a standard scattering theory a of multi-particle theory generalises to
systems based on Hamiltonians that involve higher-order derivatives in their quantum …

We provide further evidence for Smilga's conjecture that higher charges of integrable
systems are suitable candidates for higher derivative theories that possess benign ghost …

We consider the class of higher derivative field equations whose wave operator is a square
of another self-adjoint operator of lower order. At the free level, the models of this class are …