PIRSA:11020137

A Breathing mode for Compactifications

Underwood, B. (2011). A Breathing mode for Compactifications. Perimeter Institute. https://pirsa.org/11020137

Underwood, Bret. A Breathing mode for Compactifications. Perimeter Institute, Feb. 25, 2011, https://pirsa.org/11020137 

          @misc{ pirsa_PIRSA:11020137,
            doi = {10.48660/11020137},
            url = {https://pirsa.org/11020137},
            author = {Underwood, Bret},
            keywords = {Cosmology},
            language = {en},
            title = {A Breathing mode for Compactifications},
            publisher = {Perimeter Institute},
            year = {2011},
            month = {feb},
            note = {PIRSA:11020137 see, \url{https://pirsa.org}}
          }

Bret Underwood

Pacific Lutheran University

Talk number
PIRSA:11020137
Collection
Talk Type
Subject
Abstract
Reducing a higher dimensional theory to a 4-dimensional effective theory results in a number of scalar fields describing, for instance, fluctuations of higher dimensional scalar fields (dilaton) or the volume of the compact space (volume modulus). But the fields in the effective theory must be constructed with care: artifacts from the higher dimensions, such as higher dimensional diffeomorphisms and constraint equations, can affect the identification of the degrees of freedom. The effective theory including these effects resembles in many ways cosmological perturbation theory. I will show how constraints and diffeomorphisms generically lead the dilaton and volume modulus to combine into a single degree of freedom in the effective theory, the "breathing mode". This has important implications for models of moduli stabilization and inflation with extra dimensions.