PIRSA:09050071 Conference Quantum Gravity Quantum Fields and Strings Particle Physics Cosmology

DOI10.48660/09050071

Conference/School: New Prospects for Solving the Cosmological Constant Problem - 2009

Randjbar-Daemi, S. (2009). Infrared Modification of Gravity with Dynamical Torsion. Perimeter Institute. https://pirsa.org/09050071

Randjbar-Daemi, Seifallah. Infrared Modification of Gravity with Dynamical Torsion. Perimeter Institute, May. 25, 2009, https://pirsa.org/09050071 

@misc{ pirsa_PIRSA:09050071,
  doi = {10.48660/09050071},
  url = {https://pirsa.org/09050071},
  author = {Randjbar-Daemi, Seifallah},
  keywords = {Quantum Gravity, Quantum Fields and Strings, Particle Physics, Cosmology},
  language = {en},
  title = {Infrared Modification of Gravity with Dynamical Torsion},
  publisher = {Perimeter Institute},
  year = {2009},
  month = {may},
  note = {PIRSA:09050071 see, \url{https://pirsa.org}}
}

Abstract

Theories of gravity having connection as an independent dynamical variable can have a massive spin -2 particle together with the massless graviton in their spectrum. We study the potentiality of such models as a consistent infrared modification of gravity. It will be shown that these models are free from ghost like Boulware-Deser mode in the background of arbitrary torsionless Einstein manifolds. At least for weak for weak enough curvature the dangerous spin zero mode has a healthy kinetic energy in our backgrounds. vDVZ singularity seems to be a generic feature which may be cured by Vainshtein mechanism as in other infrared modified theories of gravity.

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