Trodden, Mark

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2009 - 200912010 - 20111
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  • Publication
    Stability and Superluminality of Spherical DBI Galileon Solutions
    (2011-04-12) Goon, Garrett L.; Hinterbichler, Kurt; Trodden, Mark
    The Dirac-Born-Infeld (DBI) Galileons are a generalization of the Galileon terms, which extend the internal Galilean symmetry to an internal relativistic symmetry, and can also be thought of as generalizations of DBI which yield second order field equations. We show that, when considered as local modifications to gravity, such as in the Solar System, there exists a region of parameter space in which spherically symmetric static solutions exist and are stable. However, these solutions always exhibit superluminality, casting doubt on the existence of a standard Lorentz invariant UV completion.
  • Publication
    Non-Gaussian Signatures from the Postinflationary Early Universe
    (2009-12-14) Silvestri, Alessandra; Trodden, Mark
    We consider contributions to non-Gaussianity of the cosmic microwave background (CMB) from remnants of phase transitions in the very early Universe. Such signatures can optimistically be used to discover evidence of new particle physics through cosmological observations. More conservatively they may provide an obstacle to extracting information about the non-Gaussian nature of primordial density fluctuations from any detection in the CMB. We study this explicitly by computing the bispectrum from global textures, which occur in a wide class of particle physics models.