Scalar speed limits and cosmology: Acceleration from D-cceleration
By E. Silverstein, David Tong. Physical Review D, 2003
805 citations recorded by the source corpus.
Causality on the gravity side of the AdS/CFT correspondence restricts motion on the moduli space of the N = 4 super Yang Mills theory by imposing a speed limit on how fast the scalar field may roll. This effect can be traced to higher derivative operators arising from integrating out light degrees of freedom near the origin. In the strong coupling limit of the theory, the dynamics is well approximated by the Dirac-Born-Infeld Lagrangian for a probe D3-brane moving toward the horizon of the AdS Poincare patch, combined with an estimate of the (ultimately suppressed) rate of particle and string production in the system. We analyze the motion of a rolling scalar field explicitly in the strong coupling regime of the field theory, and extend the analysis to cosmological systems obtained by coupling this type of field theory to four dimensional gravity. This leads to a mechanism for slow roll inflation for a massive scalar at subPlanckian VEV without need for a flat potential (realizing a version of k-inflation in a microphysical framework). It also leads to a variety of novel FRW cosmologies, some of which are related to those obtained with tachyon matter.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/6a1095ef8db12f3f627266fc523e905f02bda6af
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Citations in the corpus
- On couplings to matter in massive (bi-)gravity (2014, neutral): “As another example we can cite the DBI model [18, 109] which enjoys a shift-symmetry P (X,χ) = −f(χ)−1 √ 1−Xf(χ).”
- An ignoble approach to large field inflation (2010, background): “This summation is possible in some string theory models; for example, when the inflaton corresponds to motion on the Coulomb branch of a strongly coupled gauge theory whose supergravity dual is known [60, 61].”
- Trapped Inflation (2009, methodology): “Finally, as with other mechanisms such as [5,6] in which interactions slow the inflaton, a simple estimate reveals a correspondingly large non-Gaussian contribution to the perturbation spectrum in trapped inflation, which will be within the range tested by the upcoming Planck satellite [18] accordin”
- CMB from CFT (2012, background): “ction in different models of inflation. (See [1, 4] and references there.) The symmetries of de Sitter space need not be shared by the scalar sector in general. This happens for example in DBI inflation [5] where the non-canonical kinetic energy term for the inflaton results in a speed of sound cs 6= 1.”
- DBI in the sky (2004, methodology): “Therefore in the bulk of our analysis we will assume the adiabatic vacuum for the modes, with C+ = 1, C− = 0.”
- Planck 2018 results. IX. Constraints on primordial non-Gaussianity (2019, methodology): “The Dirac-Born-Infeld (DBI) models of inflation (Silverstein & Tong 2004; Alishahiha et al. 2004) are a stringtheory-motivated example of the P(X, φ) models, predicting an almost equilateral type NG with f equilNL ∝ c−2s for cs 1.”
- Planck 2015 results. XVII. Constraints on primordial non-Gaussianity (2015, neutral): “Simple resonance model: periodic features in the inflationary potential can induce oscillations with frequencyω that can resonate through any interactions with the inflationary fluctuations, contributing to the bispectrum.”
- CMB-S4 Science Case, Reference Design, and Project Plan (2019, background): “in which inflaton fluctuations have non-trivial self-interactions [92, 93, 94, 95, 96, 83] or couplings between the inflaton and other (potentially massive) degrees of freedom [97, 98, 99, 100, 101, 89, 85].”