109 citations · 712 across the 45 of their papers we have counts for
8 papers · 1 filter
Emergence of time in quantum gravity: is time necessarily flowing ?
Pierre Martinetti
We discuss the emergence of time in quantum gravity, and ask whether time is always "something that flows"'. We first recall that this is indeed the case in both relativity and qua…
Line element in quantum gravity: the examples of DSR and noncommutative geometry
Pierre Martinetti
We question the notion of line element in some quantum spaces that are expected to play a role in quantum gravity, namely non-commutative deformations of Minkowski spaces. We recal…
Conformal mapping of Unruh temperature
Pierre Martinetti
Thanks to a local interpetation of the KMS condition, the mapping from (unbounded) wedge regions of Minkowski space-time to (bounded) double-cone regions is extended to the Unruh t…
First results of the Noether theorem for Hopf-algebra spacetime symmetries
Giovanni Amelino-Camelia, Giulia Gubitosi, Antonino Marciano +4
We summarize here the first results obtained using a technique we recently developed for the Noether analysis of Hopf-algebra spacetime symmetries, including the derivation of cons…
Is life a thermal horizon ?
Pierre Martinetti
This talk aims at questioning the vanishing of Unruh temperature for an inertial observer in Minkovski spacetime with finite lifetime, arguing that in the non eternal case the exis…
What kind of noncommutative geometry for quantum gravity ?
Pierre Martinetti
We give a brief account of the description of the standard model in noncommutative geometry as well as the thermal time hypothesis, questioning their relevance for quantum gravity.
A brief remark on Unruh effect and causality
P. Martinetti
Unruh effect states that the vacuum of a quantum field theory on Minkovski space-time looks like a thermal state for an eternal uniformly accelerated observer. Adaptation to the no…
Diamonds's Temperature: Unruh effect for bounded trajectories and thermal time hypothesis
P. Martinetti, C. Rovelli
We study the Unruh effect for an observer with a finite lifetime, using the thermal time hypothesis. The thermal time hypothesis maintains that: (i) time is the physical quantity d…