The universe as a quantum gravity condensate.


Oriti, D. (2016). The universe as a quantum gravity condensate.. Perimeter Institute. https://pirsa.org/16110048


Oriti, Daniele. The universe as a quantum gravity condensate.. Perimeter Institute, Nov. 03, 2016, https://pirsa.org/16110048


          @misc{ pirsa_16110048,
            doi = {},
            url = {https://pirsa.org/16110048},
            author = {Oriti, Daniele},
            keywords = {Quantum Gravity},
            language = {en},
            title = {The universe as a quantum gravity condensate.},
            publisher = {Perimeter Institute},
            year = {2016},
            month = {nov},
            note = {PIRSA:16110048 see, \url{https://pirsa.org}}


I describe how, within the group field theory (GFT) formalism for quantum gravity, we can: 


1) provide a candidate description of the quantum building blocks of spacetime, bringing together ideas and mathematical structures from other quantum gravity formalisms;


2) apply powerful tools from quantum field theory, like the (perturbative and non-perturbative) renormalization group, to establish the quantum consistency of given GFT models and to study their continuum limit and phase structure;


3) extract, from the full theory, an effective cosmological dynamics for the universe described as a quantum condensate of GFT building blocks; in the simplest approximation, this dynamics reduces to the Friedmann equations at large scales but replaces the classical big bang singularity with a quantum bounce.