The anamorphic universe

Anna Ijjas, Paul J. Steinhardt

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We introduce "anamorphic" cosmology, an approach for explaining the smoothness and flatness of the universe on large scales and the generation of a nearly scale-invariant spectrum of adiabatic density perturbations. The defining feature is a smoothing phase that acts like a contracting universe based on some Weyl frame-invariant criteria and an expanding universe based on other frame-invariant criteria. An advantage of the contracting aspects is that it is possible to avoid the multiverse and measure problems that arise in inflationary models. Unlike ekpyrotic models, anamorphic models can be constructed using only a single field and can generate a nearly scale-invariant spectrum of tensor perturbations. Anamorphic models also differ from pre-big bang and matter bounce models that do not explain the smoothness. We present some examples of cosmological models that incorporate an anamorphic smoothing phase.

Original languageEnglish (US)
Article number001
JournalJournal of Cosmology and Astroparticle Physics
Volume2015
Issue number10
DOIs
StatePublished - Oct 1 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Keywords

  • alternatives to inflation
  • modified gravity
  • physics of the early universe

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