Results 21 to 30 of about 174,751,317 (275)
Journal of High Energy Physics, 2021 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 dynamics, possibly at criticality, via a phase transition.
Luca Marchetti +3 more
doaj +1 more source
The higher-order phase transition in toroidal CDT
Journal of High Energy Physics, 2020 We investigate the transition between the phases B and C b observed in four-dimensional Causal Dynamical Triangulations (CDT). We find that the critical properties of CDT with toroidal spatial topology are the same as earlier observed in spherical ...
J. Ambjørn +5 more
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Phase transitions in TGFT: a Landau-Ginzburg analysis of Lorentzian quantum geometric models
Journal of High Energy Physics, 2023 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 collective dynamics gives rise to continuum spacetime at a coarse grained
Luca Marchetti +3 more
doaj +1 more source
Matrix lattice Boltzmann reloaded [PDF]
, 2011 The lattice Boltzmann equation has been introduced about twenty years ago as a new paradigm for computational fluid dynamics. In this paper, we revisit the main formulation of the lattice Boltzmann collision integral (matrix model) and introduce a new ...
Asinari, P. +14 more
core +1 more source
Applying gauge/gravity duality to Composite Higgs models [PDF]
EPJ Web of Conferences, 2022 The AdS/CFT correspondence and its generalization to gauge/gravity dualities provide a very useful approach into solving strongly coupled systems. We put this at work for the strongly coupled sector of Composite Higgs models.
Porod Werner
doaj +1 more source
Models of collective cell behaviour with crowding effects :\ud comparing lattice-based and lattice-free approaches [PDF]
, 2012 Individual-based models describing the migration and proliferation of a population of cells frequently restrict the cells to a predefined lattice. An implicit assumption of this type of lattice based model is that a proliferative population will always ...
Simpson, Matthew, Plank, Michael
core +1 more source
The viability of modified gravity theories [PDF]
, 2009 PhDThis thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories ...
Uddin, Kotub
core +4 more sources
Towards an UV fixed point in CDT gravity
Journal of High Energy Physics, 2019 CDT is an attempt to formulate a non-perturbative lattice theory of quantum gravity. We describe the phase diagram and analyse the phase transition between phase B and phase C (which is the analogue of the de Sitter phase observed for the spherical ...
J. Ambjørn +4 more
doaj +1 more source
Universal critical behavior in tensor models for four-dimensional quantum gravity
Journal of High Energy Physics, 2020 Four-dimensional random geometries can be generated by statistical models with rank-4 tensors as random variables. These are dual to discrete building blocks of random geometries. We discover a potential candidate for a continuum limit in such a model by
Astrid Eichhorn +3 more
doaj +1 more source
, 2010 The observable universe could be a 1+3-surface (the “brane”) embedded in a 1+3+d-dimensional spacetime (the “bulk”), with Standard Model particles and fields trapped on the brane while gravity is free to access the bulk.
Roy Maartens +3 more
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