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FAU^2 Workshop on quantum gravity across scales: from physics at the Planck scale to effective theories

May 20 – 22, 2025
ECAP Laboratory Building
Europe/Berlin timezone

Session

Session 5

May 22, 2025, 1:30 PM
ECAP Laboratory Building

ECAP Laboratory Building

Nikolaus-Fiebiger-Straße 2 91058 Erlangen

Presentation materials

There are no materials yet.

  1. 59. Quantum reference frames and their application in quantum gravity
    Philipp Höhn
    5/22/25, 1:30 PM
    invited talk

    Quantum reference frames are a universal tool for dealing with symmetries in quantum systems. They are the means to describe a quantum system "from the inside" and key for completing the relational paradigm. As such, they naturally arise in quantum gravity whenever we build invariant observables. In this talk, I will review quantum reference frames and some of their applications to questions...

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  2. 54. Effective actions and observables
    Kevin Falls
    5/22/25, 2:10 PM
    invited talk

    In quantum gravity, there is a huge freedom in constructing effective actions since they depend on a choice of gauge and field parameterisation. In this talk, I will discuss an approach to constructing effective actions for gauge-invariant fields. Moreover, I will discuss recent progress in understanding when two effective actions are physically equivalent. Some consequences for quantum...

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  3. 61. Hamiltonian renormalisation of the U(1)^3 model for 3+1 quantum gravity
    Melissa Rodriguez Zarate
    5/22/25, 2:50 PM
    contributed talk
  4. 64. What triangulations at criticality in TGFT?
    Johannes Thürigen
    5/22/25, 3:20 PM
    contributed talk

    One way to obtain a continuum limit of Spin Foams is to use a field-theory partitition function to generate triangulations as Feynman diagrams and tune to criticality. This philosophy works well for Matrix-Models with a limit to 2D Quantum Gravity and these have a well established generalization to Tensorial Group Field Theory (TGFT) generating 4D triangulations. However, finding a 4D...

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  5. 63. Dynamics of semiclassical states in the single-vertex model of quantum-reduced loop gravity
    Ilkka Mäkinen
    5/22/25, 3:50 PM
    contributed talk
  6. 62. Computing the graph-changing dynamics of loop quantum gravity
    Thiago Lucena de Macedo Guedes
    5/22/25, 4:20 PM
    contributed talk
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