90 citations · 438 across the 15 of their papers we have counts for
15 papers
Problems with models of a fundamental length
David Campo
I critically examine various ad hoc models describing a fundamental minimal length at the level of the propagator. They violate causality and/or unitarity.
Anisotropic Kantowski-Sachs Universe from Gravitational Tunneling and its Observational Signatures
Julian Adamek, David Campo, Jens C. Niemeyer
In a landscape of compactifications with different numbers of macroscopic dimensions, it is possible that our universe has nucleated from a vacuum where some of our four large dime…
Why does the Unruh effect rely on Lorentz invariance, while Hawking radiation does not ?
David Campo, Nathaniel Obadia
We show that without Lorentz invariance, the Unruh effect does not exist. We use modified dispersion relations and describe in turn: the non-thermal nature of the vacuum (defined i…
Quantum corrections during inflation and conservation of adiabatic perturbations
David Campo
The possibility that quantum corrections break the conservation of superhorizon adiabatic perturbations in single field inflation is examined. I consider the lowest order correctio…
Inflationary Spectra from Lorentz Violating Dissipative Models
Julian Adamek, David Campo, Jens C. Niemeyer +1
The sensitivity of inflationary spectra to initial conditions is addressed in the context of a phenomenological model that breaks Lorentz invariance by dissipative effects above so…
Decoherence and entropy of primordial fluctuations. I: Formalism and interpretation
David Campo, Renaud Parentani
We propose an operational definition of the entropy of cosmological perturbations based on a truncation of the hierarchy of Green functions. The value of the entropy is unambiguous…