Alternatives to Cosmological Inflation

IHEP); Robert H. Brandenberger (McGill

Alternatives to Cosmological Inflation

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arxiv 0902.4731 v1 pith:EHPLSFKZ submitted 2009-02-27 hep-th astro-ph.COgr-qchep-ph

Robert H. Brandenberger (McGill , IHEP) This is my paper · ORCID

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keywords alternativescosmologyproblemswillalternativealthoughbounceconceptual

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The inflationary paradigm, although very successful phenomenologically, suffers from several conceptual problems which motivate the search for alternative scenarios of early universe cosmology. Here, two possible alternatives will be reviewed. - "string gas cosmology" and the "matter bounce". Their successes and problems will be pointed out.

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Pure Chromo-Natural Inflation: Signatures of Particle Production from Weak to Strong Backreaction
astro-ph.CO 2025-04 conditional novelty 6.0 of 10

Pure chromo-natural inflation unavoidably transitions from weak to strong backreaction, producing a chiral three-peak gravitational wave spectrum and a scalar peak that can form primordial black holes.

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