73 citations · 467 across the 25 of their papers we have counts for
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Quantum Gravity, Hydrodynamics and Emergent Cosmology: A Collection of Perspectives
Jibril Ben Achour, Dario Benedetti, Martin Bojowald +17
This collection of perspective pieces captures recent advancements and reflections from a dynamic research community dedicated to bridging quantum gravity, hydrodynamics, and emerg…
Phase transitions in TGFT: Landau-Ginzburg analysis of the causally complete Lorentzian Barrett-Crane model
Roukaya Dekhil, Alexander F. Jercher, Andreas G. A. Pithis
It is expected that continuum spacetime emerges via phase transition in the tensorial group field theory (TGFT) approach to quantum gravity. Recent work on the application of Landa…
Scalar Cosmological Perturbations from Quantum Gravitational Entanglement
Alexander F. Jercher, Luca Marchetti, Andreas G. A. Pithis
A major challenge at the interface of quantum gravity and cosmology is to explain the emergence of the large-scale structure of the Universe from Planck scale physics. In this lett…
Scalar Cosmological Perturbations from Quantum Entanglement within Lorentzian Quantum Gravity
Alexander F. Jercher, Luca Marchetti, Andreas G. A. Pithis
We derive the dynamics of (isotropic) scalar perturbations from the mean-field hydrodynamics of full Lorentzian quantum gravity, as described by a two-sector (timelike and spacelik…
Mean-field phase transitions in TGFT quantum gravity
Luca Marchetti, Daniele Oriti, Andreas G. A. Pithis +1
Controlling the continuum limit and extracting effective gravitational physics are shared challenges for quantum gravity approaches based on quantum discrete structures. The descri…
Phase transitions in TGFT: a Landau-Ginzburg analysis of Lorentzian quantum geometric models
Luca Marchetti, Daniele Oriti, Andreas G. A. Pithis +1
In the tensorial group field theory (TGFT) approach to quantum gravity, the basic quanta of the theory correspond to discrete building blocks of geometry. It is expected that their…
The Complete Barrett-Crane Model and its Causal Structure
Alexander F. Jercher, Daniele Oriti, Andreas G. A. Pithis
The causal structure is a quintessential element of continuum spacetime physics and needs to be properly encoded in a theory of Lorentzian quantum gravity. Established spin foam (a…
Emergent Cosmology from Quantum Gravity in the Lorentzian Barrett-Crane Tensorial Group Field Theory Model
Alexander F. Jercher, Daniele Oriti, Andreas G. A. Pithis
We study the cosmological sector of the Lorentzian Barrett-Crane (BC) model coupled to a free massless scalar field in its Group Field Theory (GFT) formulation, corresponding to th…
Phase transitions in tensorial group field theories: Landau-Ginzburg analysis of models with both local and non-local degrees of freedom
Luca Marchetti, Daniele Oriti, Andreas G. A. Pithis +1
In the tensorial group field theory approach to quantum gravity, the theory is based on discrete building blocks and continuum spacetime is expected to emerge from their collective…
The phase diagram of the multi-matrix model with ABAB-interaction from functional renormalization
Astrid Eichhorn, Antonio D. Pereira, Andreas G. A. Pithis
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…
Group field theory condensate cosmology: An appetizer
A. G. A. Pithis, M. Sakellariadou
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 assum…
Aspects of quantum gravity
Andreas G. A. Pithis
For more than 80 years theoretical physicists have been trying to develop a theory of quantum gravity which would successfully combine the tenets of Einstein's theory of general re…
Can we detect quantum gravity with compact binary inspirals?
Alexander C. Jenkins, Andreas G. A. Pithis, Mairi Sakellariadou
Treating general relativity as an effective field theory, we compute the leading-order quantum corrections to the orbits and gravitational-wave emission of astrophysical compact bi…
Phase transitions in group field theory: The Landau perspective
Andreas G. A. Pithis, Johannes Thürigen
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 f…
Minimizers of the dynamical Boulatov model
Joseph Ben Geloun, Alexander Kegeles, Andreas G. A. Pithis
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 provi…
Dynamics of anisotropies close to a cosmological bounce in quantum gravity
Marco de Cesare, Daniele Oriti, Andreas G. A. Pithis +1
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 qua…
Relational evolution of effectively interacting GFT quantum gravity condensates
Andreas G. A. Pithis, M. Sakellariadou
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 i…
Impact of nonlinear effective interactions on GFT quantum gravity condensates
Andreas G. A. Pithis, Mairi Sakellariadou, Petar Tomov
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 e…
Cosmological implications of interacting Group Field Theory models: cyclic Universe and accelerated expansion
Marco de Cesare, Andreas G. A. Pithis, Mairi Sakellariadou
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…
Anyonic statistics and large horizon diffeomorphisms for Loop Quantum Gravity Black Holes
Andreas G. A. Pithis, Hans-Christian Ruiz Euler
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 ai…
The Gibbs paradox, Black hole entropy and the thermodynamics of isolated horizons
Andreas G. A. Pithis
This letter presents a new, solely thermodynamical argument for considering the states of the quantum isolated horizon of a black hole as distinguishable. We claim that only if the…