PIRSA:11090067

Cosmology Meets Quantum Gravity: a Chiral Signature in the CMB?

Magueijo, J. (2011). Cosmology Meets Quantum Gravity: a Chiral Signature in the CMB?. Perimeter Institute. https://pirsa.org/11090067

Magueijo, Joao. Cosmology Meets Quantum Gravity: a Chiral Signature in the CMB?. Perimeter Institute, Sep. 08, 2011, https://pirsa.org/11090067 

          @misc{ pirsa_PIRSA:11090067,
            doi = {10.48660/11090067},
            url = {https://pirsa.org/11090067},
            author = {Magueijo, Joao},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Cosmology Meets Quantum Gravity: a Chiral Signature in the CMB?},
            publisher = {Perimeter Institute},
            year = {2011},
            month = {sep},
            note = {PIRSA:11090067 see, \url{https://pirsa.org}}
          }

Joao Magueijo

Imperial College London

Talk number
PIRSA:11090067
Collection
Talk Type
Subject
Abstract
Cosmology and quantum gravity have not always had the smoothest of interactions. As a case in point I'll summarize the calculation behind the prediction of tensor modes in inflationary universes and discuss the difficulties found in recasting this calculation in terms of Ashtekar-Barbero-Immirzi variables. Contrary to the belief that ``inflation is shielded from quantum gravity'', novelties are found, leading to the interesting prediction of a chiral signature in the gravitational wave background, proportional to the imaginary part of the Immirzi parameter. This would leave a distinctive imprint in the polarization of the cosmic microwave background. On a more theoretical level, our remarks shed light on matters permeating quantum gravity, such as the inner product, the ground state (which we prove is NOT the Kodama state) and ordering issues.