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A Cyclic Model of the Universe

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arxiv hep-th/0111030 v2 pith:MCP2MPOA submitted 2001-11-04 hep-th astro-ph

Paul J. Steinhardt , Neil Turok This is my paper · ORCID
classification hep-thastro-ph
keywords bangcrunchcycledensitymodelslowuniverseaccelerated
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We propose a cosmological model in which the universe undergoes an endless sequence of cosmic epochs each beginning with a `bang' and ending in a `crunch.' The temperature and density are finite at each transition from crunch to bang. Instead of having an inflationary epoch, each cycle includes a period of slow accelerated expansion (as recently observed) followed by slow contraction. The combination produces the homogeneity, flatness, density fluctuations and energy needed to begin the next cycle.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Phase-resolved field-space distance criteria in ekpyrotic, bouncing and cyclic cosmologies

    gr-qc 2026-05 unverdicted novelty 7.0 of 10

    Proposes phase-resolved invariant path-length criteria and a master formula for lower bound on ε_ek in ekpyrotic cosmologies, using BKL suppression and conversion windows as constraints.

  2. Dynamical systems analysis of an Einstein-Cartan ekpyrotic nonsingular bounce cosmology

    gr-qc 2025-12 unverdicted novelty 6.0 of 10

    An Einstein-Cartan ekpyrotic model with a steep-to-plateau scalar potential supports a torsion-driven nonsingular bounce in homogeneous contraction without chaotic behavior in the explored parameter space.

  3. The old problem of the cosmological constant solved?

    gr-qc 2025-05 reject novelty 4.0 of 10

    A speculative essay claims that a model of gravity as superluminal phonons on a ring lattice solves the cosmological constant problem, but provides no derivation of the values or dynamics.

  4. Breaking Free from the Swampland of Impossible Universes through the DESI Portal

    astro-ph.CO 2026-05 unverdicted novelty 3.0 of 10

    DESI data indicating evolving dark energy may allow string theory to describe observed universes without violating swampland constraints on constant dark energy.

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