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Topology induced first-order phase transitions in lattice quantum gravity

Autor: Ambjorn, J., Gizbert-Studnicki, J., Görlich, A., Németh, D.

Causal Dynamical Triangulations (CDT) is a lattice formulation of quantum gravity, suitable for Monte-Carlo simulations which have been used to study the phase diagram of the model. It has four phases characterized by different dominant geometries, d

Externí odkaz: http://arxiv.org/abs/2202.07392

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CDT Quantum Toroidal Spacetimes: An Overview

Autor: Ambjorn, J., Drogosz, Z., Gizbert-Studnicki, J., Görlich, A., Jurkiewicz, J., Nèmeth, D.

Lattice formulations of gravity can be used to study non-perturbative aspects of quantum gravity. Causal Dynamical Triangulations (CDT) is a lattice model of gravity that has been used in this way. It has a built-in time foliation but is coordinate-i

Externí odkaz: http://arxiv.org/abs/2103.15610

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Matter-driven change of spacetime topology

Autor: Ambjørn, J., Drogosz, Z., Gizbert-Studnicki, J., Görlich, A., Jurkiewicz, J., Németh, D.

Using Monte-Carlo computer simulations, we study the impact of matter fields on the geometry of a typical quantum universe in the CDT model of lattice quantum gravity. The quantum universe has the size of a few Planck lengths and the spatial topology

Externí odkaz: http://arxiv.org/abs/2103.00198

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Cosmic voids and filaments from quantum gravity

Autor: Ambjorn, J., Drogosz, Z., Gizbert-Studnicki, J., Görlich, A., Jurkiewicz, J., Németh, D.

Using computer simulations we study the geometry of a typical quantum universe, i.e. the geometry one might expect before a possible period of inflation. We display it using coordinates defined by means of four classical scalar fields satisfying the

Externí odkaz: http://arxiv.org/abs/2101.08617

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A multi-instance deep neural network classifier: application to Higgs boson CP measurement

Autor: Bialas, P., Nemeth, D., Richter-Wąs, E.

We investigate properties of a classifier applied to the measurements of the CP state of the Higgs boson in $H\rightarrow\tau\tau$ decays. The problem is framed as binary classifier applied to individual instances. Then the prior knowledge that the i

Externí odkaz: http://arxiv.org/abs/1803.00838

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