Quantum Cosmology from Group Field Theory Condensates: a Review
arXiv:1602.08104 · doi:10.3842/SIGMA.2016.082
Abstract
We give, in some detail, a critical overview over recent work towards deriving a cosmological phenomenology from the fundamental quantum dynamics of group field theory (GFT), based on the picture of a macroscopic universe as a "condensate" of a large number of quanta of geometry which are given by excitations of the GFT field over a "no-space" vacuum. We emphasise conceptual foundations, relations to other research programmes in GFT and the wider context of loop quantum gravity (LQG), and connections to the quantum physics of real Bose-Einstein condensates. We show how to extract an effective dynamics for GFT condensates from the microscopic GFT physics, and how to compare it with predictions of more conventional quantum cosmology models, in particular loop quantum cosmology (LQC). No detailed familiarity with the GFT formalism is assumed.
References in corpus (40)
- Quantum Nature of the Big Bang: Improved dynamics
- LQG vertex with finite Immirzi parameter
- Polyhedra in loop quantum gravity
- Group field theory with non-commutative metric variables
- Quantum cosmology: a review
- Algebraic Quantum Gravity (AQG) I. Conceptual Setup
- Towards Spinfoam Cosmology
- The causal set approach to quantum gravity
- Lattice refining loop quantum cosmology, anisotropic models and stability
- Functional Renormalisation Group Approach for Tensorial Group Field Theory: a Rank-3 Model
- Bouncing cosmologies from quantum gravity condensates
- EPRL/FK Group Field Theory
- Emergent Gravity Paradigm: Recent Progress
- Are the spectra of geometrical operators in Loop Quantum Gravity really discrete?
- Zakopane lectures on loop gravity
- Algebraic Quantum Gravity (AQG) II. Semiclassical Analysis
- 3d Spinfoam Quantum Gravity: Matter as a Phase of the Group Field Theory
- Functional Renormalisation Group analysis of Tensorial Group Field Theories on
- Discreteness of the volume of space from Bohr-Sommerfeld quantization
- Quantum cosmology from quantum gravity condensates: cosmological variables and lattice-refined dynamics
- Dimensional flow in discrete quantum geometries
- Towards classical geometrodynamics from Group Field Theory hydrodynamics
- Group field theory formulation of 3d quantum gravity coupled to matter fields
- A quantum reduction to Bianchi I models in loop quantum gravity
- A quantum field theory of simplicial geometry and the emergence of spacetime
- Impact of nonlinear effective interactions on GFT quantum gravity condensates
- Loop quantum cosmology from group field theory
- Dynamical Quantum Geometry (DQG Programme)
- Classical Inflationary and Ekpyrotic Universes in the No-Boundary Wavefunction
- Group Field Theory in dimension four minus epsilon
- Semiclassical analysis of the Loop Quantum Gravity volume operator: I. Flux Coherent States
- Emergent Gravity requires (kinematic) non-locality
- On loop quantum gravity kinematics with non-degenerate spatial background
- Space does not exist, so time can
- Non-linear (loop) quantum cosmology
- Perturbing a quantum gravity condensate
- A group field theory for 3d quantum gravity coupled to a scalar field
- Loop Quantum Cosmology from Loop Quantum Gravity
- Effective equations for GFT condensates from fidelity
- Inflation and the Measurement Problem
Cited by in corpus (78)
- Bouncing Cosmologies: Progress and Problems
- Emergent Friedmann dynamics with a quantum bounce from quantum gravity condensates
- The universe as a quantum gravity condensate
- Flowing in Group Field Theory Space: a Review
- Invitation to Random Tensors
- Multifractional theories: an unconventional review
- A purification postulate for quantum mechanics with indefinite causal order
- Testing loop quantum cosmology
- Cosmological perturbations from full quantum gravity
- Asymptotic safety in three-dimensional SU(2) Group Field Theory: evidence in the local potential approximation
- Quantum gravity and gravitational-wave astronomy
- Emergence of a low spin phase in group field theory condensates
- Renormalizable Group Field Theory beyond melonic diagrams: an example in rank four
- Group field theory for quantum gravity minimally coupled to a scalar field
- Black Holes as Quantum Gravity Condensates
- Bouncing Unitary Cosmology I: Mini-Superspace General Solution
- Accelerated expansion of the Universe without an inflaton and resolution of the initial singularity from Group Field Theory condensates
- Multifractional theories: an updated review
- Nonperturbative renormalization group beyond melonic sector: The Effective Vertex Expansion method for group fields theories
- Group field theory and its cosmology in a matter reference frame
- Impact of nonlinear effective interactions on GFT quantum gravity condensates
- The separate universe framework in group field theory condensate cosmology
- Relational evolution of effectively interacting GFT quantum gravity condensates
- Inhomogeneous universe from group field theory condensate
- New Hamiltonians for loop quantum cosmology with arbitrary spin representations
- Generalised effective cosmology from group field theory
- Bouncing evolution in a model of loop quantum gravity
- Quantum fluctuations in the effective relational GFT cosmology
- Emergent Cosmology from Quantum Gravity in the Lorentzian Barrett-Crane Tensorial Group Field Theory Model
- Dynamics of anisotropies close to a cosmological bounce in quantum gravity
- Imprint of quantum gravity in the dimension and fabric of spacetime
- Phantom-like dark energy from quantum gravity
- Effective dynamics of scalar cosmological perturbations from quantum gravity
- Thermal quantum gravity condensates in group field theory cosmology
- Dimensional flow and fuzziness in quantum gravity: emergence of stochastic spacetime
- Phase transitions in group field theory: The Landau perspective
- Progress in the solving nonperturbative renormalization group for tensorial group field theory
- Hamiltonian group field theory with multiple scalar matter fields
- Inequivalent coherent state representations in group field theory
- Limiting curvature mimetic gravity for group field theory condensates
- Ward-constrained melonic renormalization group flow for the rank-four tensorial group field theory
- Unitary symmetry constraints on tensorial group field theory renormalization group flow
- Thermal representations in group field theory: squeezed vacua and quantum gravity condensates
- Markov Chain Monte Carlo methods for graph refinement in Spinfoam Cosmology
- Quantum Gravity on the computer: Impressions of a workshop
- Renormalization of group field theories for quantum gravity: new scaling results and some suggestions
- Continuous point symmetries in Group Field Theories
- Frozen formalism and canonical quantization in group field theory
- Flowing in discrete gravity models and Ward identities: A review
- Phase transitions in tensorial group field theories: Landau-Ginzburg analysis of models with both local and non-local degrees of freedom
- Addendum to "Relational Hamiltonian for group field theory"
- Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review
- Towards anisotropic cosmology in group field theory
- Holographic entanglement in spin network states: a focused review
- Tullio Regge's legacy: Regge calculus and discrete gravity
- The landscape of polymer quantum cosmology
- Scalar Cosmological Perturbations from Quantum Entanglement within Lorentzian Quantum Gravity
- QFT with Tensorial and Local Degrees of Freedom: Phase Structure from Functional Renormalization
- Scalar Cosmological Perturbations from Quantum Gravitational Entanglement
- Dynamical Vacuum Compressibility of Space
- Cosmology in Lorentzian Regge calculus: causality violations, massless scalar field and discrete dynamics
- Generalised Gaussian states in group field theory and quantum cosmology
- Geometrogenesis in GFT: An Analysis
- Relational dynamics and Page-Wootters formalism in group field theory
- Next step in gravity and cosmology: fundamental theory or data-driven models?
- Bianchi I effective dynamics in Quantum Reduced Loop Gravity
- Quantum gravity and gravitational-wave astronomy
- Spherically-symmetric geometries in a matter reference frame as quantum gravity condensates
- Master constraint approach to quantum-reduced loop gravity
- Aspects of quantum gravity
- Foundational Issues in Group Field Theory
- Quantum Gravity, Hydrodynamics and Emergent Cosmology: A Collection of Perspectives
- A Fock space structure for the diffeomorphism invariant Hilbert space of loop quantum gravity and its applications
- Cosmological implications of the hydrodynamical phase of group field theory
- (2+1) Lorentzian quantum cosmology from spin-foams: opportunities and obstacles for semi-classicality
- Phase transitions in TGFT: Landau-Ginzburg analysis of the causally complete Lorentzian Barrett-Crane model
- L'universo emergente della gravita' quantistica
- Effective cosmology from one-body operators in group field theory