259 citations · 1.6k across the 35 of their papers we have counts for
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Black Holes as Quantum Gravity Condensates
Daniele Oriti, Daniele Pranzetti, Lorenzo Sindoni
We model spherically symmetric black holes within the group field theory formalism for quantum gravity via generalised condensate states, involving sums over arbitrarily refined gr…
Bouncing cosmologies from quantum gravity condensates
Daniele Oriti, Lorenzo Sindoni, Edward Wilson-Ewing
We show how the large-scale cosmological dynamics can be obtained from the hydrodynamics of isotropic group field theory condensate states in the Gross-Pitaevskii approximation. Th…
Quantum Cosmology from Group Field Theory Condensates: a Review
Steffen Gielen, Lorenzo Sindoni
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…
Emergent Friedmann dynamics with a quantum bounce from quantum gravity condensates
Daniele Oriti, Lorenzo Sindoni, Edward Wilson-Ewing
We study the effective cosmological dynamics, emerging as the hydrodynamics of simple condensate states, of a group field theory model for quantum gravity coupled to a massless sca…
Horizon entropy from quantum gravity condensates
Daniele Oriti, Daniele Pranzetti, Lorenzo Sindoni
We construct condensate states encoding the continuum spherically symmetric quantum geometry of an horizon in full quantum gravity, i.e. without any classical symmetry reduction, i…
Generalized quantum gravity condensates for homogeneous geometries and cosmology
Daniele Oriti, Daniele Pranzetti, James P. Ryan +1
We construct a generalized class of quantum gravity condensate states, that allows the description of continuum homogeneous quantum geometries within the full theory. They are base…
Effective equations for GFT condensates from fidelity
Lorenzo Sindoni
The derivation of effective equations for group field theories is discussed from a variational point of view, with the action being determined by the fidelity of the trial state wi…
Homogeneous cosmologies as group field theory condensates
Steffen Gielen, Daniele Oriti, Lorenzo Sindoni
We give a general procedure, in the group field theory (GFT) formalism for quantum gravity, for constructing states that describe macroscopic, spatially homogeneous universes. Thes…
Cosmology from Group Field Theory Formalism for Quantum Gravity
Steffen Gielen, Daniele Oriti, Lorenzo Sindoni
We identify a class of condensate states in the group field theory (GFT) approach to quantum gravity that can be interpreted as macroscopic homogeneous spatial geometries. We then…
New coherent states and modified heat equations
Antonio Pittelli, Lorenzo Sindoni
We clarify the relations between certain new coherent states for loop quantum gravity and the analytically continued heat kernel coherent states, highlighting the underlying genera…
Quenches and lattice simulators for particle creation
Francesco Caravelli, Fotini Markopoulou, Arnau Riera +1
In this paper we propose a framework for simulating thermal particle production in condensed matter systems. The procedure we describe can be realized by means of a quantum quench…
Horizon thermodynamics and composite metrics
Lorenzo Sindoni
We examine the conditions under which the thermodynamic behaviour of gravity can be explained within an emergent gravity scenario, where the metric is defined as a composite operat…
Multihorizon regular black holes
Stefano Ansoldi, Lorenzo Sindoni
We discuss a general procedure to generate a class of (everywhere regular) solutions of Einstein equations that can have an (a-priori fixed) arbitrary number of horizons. We then r…
The analogue cosmological constant in Bose-Einstein condensates: a lesson for quantum gravity
Stefano Finazzi, Stefano Liberati, Lorenzo Sindoni
For almost a century, the cosmological constant has been a mysterious object, in relation to both its origin and its very small value. By using a Bose-Einstein condensate analogue…
Coherent states for quantum gravity: towards collective variables
Daniele Oriti, Roberto Pereira, Lorenzo Sindoni
We investigate the construction of coherent states for quantum theories of connections based on graphs embedded in a spatial manifold, as in loop quantum gravity. We discuss the ma…
Coherent states in quantum gravity: a construction based on the flux representation of LQG
Daniele Oriti, Roberto Pereira, Lorenzo Sindoni
As part of a wider study of coherent states in (loop) quantum gravity, we introduce a modification to the standard construction, based on the recently introduced (non-commutative)…
Extended LCDM: generalized non-minimal coupling for dark matter fluids
Dario Bettoni, Stefano Liberati, Lorenzo Sindoni
In this paper we discuss a class of models that address the issue of explaining the gravitational dynamics at the galactic scale starting from a geometric point of view. Instead of…
Gravity as an emergent phenomenon: a GFT perspective
Lorenzo Sindoni
While the idea of gravity as an emergent phenomenon is an intriguing one, little is known about concrete implementations that could lead to viable phenomenology, most of the obstru…
Cosmological Constant: A Lesson from Bose-Einstein Condensates
Stefano Finazzi, Stefano Liberati, Lorenzo Sindoni
The cosmological constant is one of the most pressing problems in modern physics. We address this issue from an emergent gravity standpoint, by using an analogue gravity model. Ind…
Emergent gravitational dynamics from multi-BEC hydrodynamics?
Lorenzo Sindoni
In this paper, we examine the possibility to implement some form of emergent Newtonian gravity in a generic multi-component Bose--Einstein condensate. Parallely to what happens for…
Towards classical geometrodynamics from Group Field Theory hydrodynamics
Daniele Oriti, Lorenzo Sindoni
We take the first steps towards identifying the hydrodynamics of group field theories (GFTs) and relating this hydrodynamic regime to classical geometrodynamics of continuum space.…
A note on particle kinematics in Horava-Lifshitz scenarios
Lorenzo Sindoni
In this short note we clarify a link between anisotropic-scaling scenarios and Finsler spacetimes. Generalizing earlier analysis it is shown that the kinematics of propagating part…
Emergent gravitational dynamics in Bose-Einstein condensates
Lorenzo Sindoni, Florian Girelli, Stefano Liberati
We discuss a toy model for an emergent non-relativistic gravitational theory. Within a certain class of Bose-Einstein condensates, it is possible to show that, in a suitable regime…
Analogue Models for Emergent Gravity
Stefano Liberati, Florian Girelli, Lorenzo Sindoni
Gravity stands out among the fundamental interactions because of its apparent incompatibility with having a quantum description. Moreover, thermodynamic aspects of gravitation theo…