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Cosmological implications of interacting Group Field Theory models: cyclic Universe and accelerated expansion

- M. Cesare, A. G. A. Pithis, M. Sakellariadou
- Physics
- 1 June 2016

We study the cosmological implications of interactions between spacetime quanta in the Group Field Theory (GFT) approach to Quantum Gravity from a phenomenological perspective. Our work represents a… Expand

Impact of nonlinear effective interactions on group field theory quantum gravity condensates

- A. G. A. Pithis, M. Sakellariadou, Petar Tomov
- Physics
- 20 July 2016

We present the numerical analysis of effectively interacting Group Field Theory (GFT) models in the context of the GFT quantum gravity condensate analogue of the Gross-Pitaevskii equation for real… Expand

The phase diagram of the multi-matrix model with ABAB interaction from functional renormalization

- A. Eichhorn, Antonio D. Pereira, A. G. A. Pithis
- Physics
- 10 September 2020

At criticality, discrete quantum-gravity models are expected to give rise to continuum spacetime. Recent progress has established the functional renormalization group method in the context of such… Expand

Anyonic statistics and large horizon diffeomorphisms for loop quantum gravity black holes

- A. G. A. Pithis, H. Euler
- MathematicsPhysical Review D
- 10 February 2014

We investigate the role played by large diffeomorphisms of quantum Isolated Horizons for the statistics of LQG Black Holes by means of their relation to the braid group. To this aim the symmetries of… Expand

Group Field Theory Condensate Cosmology: An Appetizer

- A. G. A. Pithis, M. Sakellariadou
- PhysicsUniverse
- 1 April 2019

This contribution is an appetizer to the relatively young and fast-evolving approach to quantum cosmology based on group field theory condensate states. We summarize the main assumptions and pillars… Expand

Dynamics of anisotropies close to a cosmological bounce in quantum gravity

- M. Cesare, D. Oriti, A. G. A. Pithis, M. Sakellariadou
- Physics
- 4 September 2017

We study the dynamics of perturbations representing deviations from perfect isotropy in the context of the emergent cosmology obtained from the group field theory formalism for quantum gravity.… Expand

Relational evolution of effectively interacting group field theory quantum gravity condensates

- A. G. A. Pithis, M. Sakellariadou
- PhysicsPhysical Review D
- 5 December 2016

We study the impact of effective interactions onto relationally evolving GFT condensates based on real-valued fields. In a first step we show that a free condensate configuration in an isotropic… Expand

Phase transitions in group field theory: The Landau perspective

- A. G. A. Pithis, Johannes Thurigen
- PhysicsPhysical Review D
- 29 August 2018

In various approaches to quantum gravity continuum spacetime is expected to emerge from discrete geometries through a phase transition. In group field theory, various indications for such a… Expand

Minimizers of the dynamical Boulatov model

- J. B. Geloun, A. Kegeles, A. G. A. Pithis
- MathematicsThe European Physical Journal C
- 26 June 2018

We study the Euler–Lagrange equation of the dynamical Boulatov model which is a simplicial model for 3d Euclidean quantum gravity augmented by a Laplace–Beltrami operator. We provide all its… Expand

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