Online seminar by Marcin Kisielowski

Speaker: Marcin Kisielowski

Place: 241 Nicholson

Date: Wednesday Nov 13th

Time: 11 AM

Title: Spin-foam model for gravity coupled to massless scalar field

Abstract: In my talk I will present a spin-foam model for gravity coupled to massless scalar field which we derived from the Canonical Loop Quantum Gravity. We generalized to the full theory the scheme first proposed in the context of Loop Quantum Cosmology by Ashtekar, Campiglia and Henderson, later developed by Henderson, Rovelli, Vidotto and Wilson-Ewing.

Group Seminar by Muxin Han

Speaker: Muxin Han
Place: 241 Nicholson
Date: Thursday, October 31
Time: 1:30 PM

Title: Effective dynamics from full loop quantum gravity

Group Seminar by Andrea Dapor

Speaker: Andrea Dapor
Place: 241 Nicholson
Date: Thursday, October 24
Time: 1:30 PM

Title: Recent developments in LQG effective dynamics

Online Seminar by Saeed Rastgoo

Speaker: Saeed Rastgoo

Place: 241 Nicholson

Date: Thursday May 9th

Time: 11 AM

Title: Effective polymer dynamics of Schwarzschild interior via path integral: challenges and new results

Abstract: I will present a systematic method of deriving the effective polymer Hamiltonian of Schwarzschild black hole interior, using path integral, which leads to the appearance of new triad corrections in the effective Hamiltonian. These new terms present some issues such as dependence of physical quantities on fiducial variables. We propose two prescription to solve these issues. Upon using these prescription, not only the issues are resolved, but also we get new results including two types of modified (larger) minimum radius at bounce.

Online Seminar by Anzhong Wang

Speaker: Anzhong Wang

Place: 241 Nicholson

Date: Thursday May 2nd

Time: 11 AM

Title: Understanding Quantum Cosmology from loop quantum gravity

Group Seminar by Laura Herold

Speaker: Laura Herold
Place: 241 Nicholson
Date: Thursday, April 11
Time: 1:30 PM

Title: Gaussian dust as a reference field and corrections to the Mukhanov-Saskai equation

Online Seminar by Muxin Han

Speaker: Muxin Han
Place: 241 Nicholson
Date: Thursday, March 28
Time: 1:30 PM
 

Title: Emergent Gravity from Spinfoam Models

Abstract: Recently, many new insights of quantum gravity are brought by the program of emergent gravity from quantum information. An idea in this program is that gravity, which is geometrical and smooth, might emerge as low energy excitations from fundamentally entangled qubits (or generally qudits), which are algebraic and discrete. In this talk, I demonstrate that spinfoam models, on one hand, are made fundamentally by entangled qudits, while on the other hand, emerge smooth gravitational fields in a low energy limit. The result suggests the spinfoam model to be a working example of the above idea in the emergent gravity program.