Adiabatic perturbations as Goldstone bosons

          @misc{ pirsa_PIRSA:09050057,
            doi = {10.48660/09050057},
            url = {https://pirsa.org/09050057},
            author = {Nicolis, Alberto},
            keywords = {Cosmology},
            language = {en},
            title = {Adiabatic perturbations as Goldstone bosons},
            publisher = {Perimeter Institute},
            year = {2009},
            month = {may},
            note = {PIRSA:09050057 see, \url{https://pirsa.org}}
          }