506 citations · 2.1k across the 75 of their papers we have counts for
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Parity at the Planck scale
Michele Arzano, Giulia Gubitosi, Joao Magueijo
We explore the possibility that well known properties of the parity operator, such as its idempotency and unitarity, might break down at the Planck scale. Parity might then do more…
Primordial standing waves
Giulia Gubitosi, Joao Magueijo
We consider the possibility that the primordial fluctuations (scalar and tensor) might have been standing waves at their moment of creation, whether or not they had a quantum origi…
Squeezing of scalar and tensor primordial perturbations generated by modified dispersion relations
Giulia Gubitosi, Joao Magueijo
In recent work we analyzed the evolution of primordial perturbations satisfying Planck-scale-modified dispersion relations and showed that there is no cosmological "squeezing" in t…
Curved momentum spaces from quantum (Anti-)de Sitter groups in (3+1) dimensions
Angel Ballesteros, Giulia Gubitosi, Iván Gutiérrez-Sagredo +1
Curved momentum spaces associated to the -deformation of the (3+1) de Sitter and Anti-de Sitter algebras are constructed as orbits of suitable actions of the dual Poisson-Lie gr…
Curved momentum spaces from quantum groups with cosmological constant
A. Ballesteros, G. Gubitosi, I. Gutierrez-Sagredo +1
We bring the concept that quantum symmetries describe theories with nontrivial momentum space properties one step further, looking at quantum symmetries of spacetime in presence of…
The phenomenology of squeezing and its status in non-inflationary theories
Giulia Gubitosi, Joao Magueijo
In this paper we skim the true phenomenological requirements behind the concept of inflationary squeezing. We argue that all that is required is that at horizon re-entry the fluctu…