90 citations · 438 across the 15 of their papers we have counts for
4 papers · 1 filter
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.
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…
Space-time correlations in inflationary spectra, a wave packet analysis
David Campo, Renaud Parentani
The inflationary mechanism of mode amplification predicts that the state of each mode with a given wave vector is correlated to that of its partner mode with the opposite vector. T…
Space-time correlations within pairs produced during inflation, a wave-packet analysis
David Campo, Renaud Parentani
In homogeneous universes the propagation of quantum fields gives rise to pair creation of quanta with opposite momenta. When computing expectation values of operators, the correlat…