Talks by Wolfgang Wieland
Format results
Null infinity from quasilocal phase space
I will consider the phase space at nullinfinity from the r\rightarrow\infty limit of a quasilocal phase space for a finite box with a boundary that is null. This box will serve as a natural IR regulator. To remove the IR regulator, I will consider a double null foliation together with an adapted NewmanPenrose null tetrad. The limit to null infinity (on phase space) is obtained in the limit where the boundary is sent to infinity. I will introduce various charges and explain the role of the corresponding balance laws. The talk is based on the paper: arXiv:2012.01889.
PSI 2018/2019  Explorations in Quantum Gravity  Lecture 14

Hal Haggard Bard College
Brief introduction to gravitational wave detection
Worldline formalism for covariant loop gravity
I present a proposal for a worldline action for discretized gravity with the same field content as loop quantum gravity. The proposal is defined through its action, which is a onedimensional integral over the edges of the discretization. Every edge carries a finitedimensional phase space, and the evolution equations are generated by a Hamiltonian, which is a sum over the constraints of the theory. I will explain the relevance of the model, and close with possible relations to other approaches of quantum gravity, including: relative locality, causal sets and twistor theory.
A onedimensional action for simplicial gravity in three dimensions
Spin Foams  2

Giorgio Immirzi Istituto Nazionale di Fisica Nucleare (INFN) Sezione di Perugia

Aleksander Mikovic Lusofona University

Jeff Hnybida Radboud Universiteit Nijmegen
Spinor Quantisation for Complex Ashtekar Variables
Constructed from AshtekarBarbero variables, the formalism is restricted to SU(2) gauge transformations.
In this talk, I perform the generalisation to the full Lorentzian case, that is the group SL(2,C).