THE ROBUSTNESS OF INFLATION TO CHANGES IN SUPER-PLANCK-SCALE PHYSICS
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No Canadian affiliation. An affiliation-only frame — the usual design — would never have seen this work. It is one of the works that make the case for inverting the frame.
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- Teacher spread
- 0.223 · how far apart the two teachers sit on this one work
- Validation status
score_only:v0-immature-baseline· verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it
Abstract
We calculate the spectrum of density fluctuations in models of inflation based on a weakly self-coupled scalar matter field minimally coupled to gravity, and specifically investigate the dependence of the predictions on modifications of the physics on length scales smaller than the Planck length. These modifications are encoded in terms of modified dispersion relations. Whereas for some classes of dispersion relations the predictions are unchanged compared to the usual ones which are based on a linear dispersion relation, for other classes important differences are obtained, involving tilted spectra, spectra with exponential factors and with oscillations. This is the case when the dispersion relation becomes complex. We conclude that the predictions of inflationary cosmology in these models are not robust against changes in the super-Planck-scale physics.
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The record
- Venue
- Modern Physics Letters A
- Topic
- Cosmology and Gravitation Theories
- Field
- Physics and Astronomy
- Canadian institutions
- —
- Funders
- University of British ColumbiaCentre National de la Recherche ScientifiqueBrown UniversityU.S. Department of Energy
- Keywords
- PhysicsPlanckDispersion relationInflation (cosmology)CosmologyFluctuation spectrumPlanck lengthScalar fieldStatistical physicsScalar (mathematics)Planck scaleTheoretical physicsQuantum mechanicsQuantum gravityQuantum
- Has abstract in OpenAlex
- yes