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Natural inflation with pseudo Nambu-Goldstone bosons
Abstract
We show that a pseudo Nambu-Goldstone boson, with a potential of the form V(\ensuremath{\varphi})=${\mathrm{\ensuremath{\Lambda}}}^{4}$[1\ifmmode\pm\else\textpm\fi{}cos(\ensuremath{\varphi}/f)], can naturally give rise to an epoch of inflation in the early Universe. Successful inflation can be achieved if f\ensuremath{\sim}${\mathit{m}}_{\mathrm{Pl}}$ and \ensuremath{\Lambda}\ensuremath{\sim}${\mathit{m}}_{\mathrm{GUT}}$. Such mass scales arise in particle-physics models with a gauge group that becomes strongly interacting at a scale \ensuremath{\sim}\ensuremath{\Lambda}, e.g., as can happen in superstring theories. The density fluctuation spectrum is non-scale-invariant, with extra power on large length scales.
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“Applying this to the case of inflation, we showed that one generically expects a very large amount of inflation for unbounded potentials such as V (φ) ∝ φ(2), and relatively few e-folds for “natural” inflation [70] in which V (φ) ∝ cos(φ).”
BackgroundCosmological constraints on slow roll inflation: An update
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Metadata
- Authors
- Freese, K., Frieman, J. A., & Olinto, A. V.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 1990-12-24
- Volume
- 65
- Issue
- 26
- Pages
- 3233-3236
- ISSN
- 0031-9007 (ISSN-L)
- OpenAlex
- W2103022510
- Cited by
- 1,374
- References
- 4
- FWCI
- 19.45
- Type
- journal article
- Language
- en
- Open access
- closed
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