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Inflation in a scale invariant universe

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arxiv 1802.06069 v2 pith:GMRRRNPO submitted 2018-02-16 astro-ph.CO gr-qchep-phhep-th

Pedro G. Ferreira , Christopher T. Hill , Johannes Noller , Graham G. Ross This is my paper
classification astro-ph.COgr-qchep-phhep-th
keywords theoryscalarscaleinflationinvariantisocurvaturemodesuniverse
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A scale-invariant universe can have a period of accelerated expansion at early times: inflation. We use a frame-invariant approach to calculate inflationary observables in a scale invariant theory of gravity involving two scalar fields - the spectral indices, the tensor to scalar ratio, the level of isocurvature modes and non-Gaussianity. We show that scale symmetry leads to an exact cancellation of isocurvature modes and that, in the scale-symmetry broken phase, this theory is well described by a single scalar field theory. We find the predictions of this theory strongly compatible with current observations.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 61 citations worldwide. Full citation record

  1. The unavoidable de Sitter fate of a scale-invariant Universe

    gr-qc 2026-06 unverdicted novelty 6.0 of 10

    Stable flat solutions in scale-invariant scalar-tensor theories carry a non-vanishing cosmological constant unless the quartic coupling vanishes, and this vanishing is not radiatively protected, making a residual CC generic.

  2. Weyl-invariant Einstein-Cartan gravity with a heavy ALP: Higgs Inflation and $\alpha$-attractors

    hep-ph 2025-07 conditional novelty 6.0 of 10

    In a Weyl-invariant Einstein-Cartan gravity theory with the SM Higgs and a heavy gravitational ALP, tuning two nonminimal couplings reproduces metric Higgs inflation and α-attractor-like inflation with ns≈1−2/N and r≈12/N^2.

  3. The Goldstone Awakens: Unimodular dark energy in scale-invariant $R^2$ gravity

    astro-ph.CO 2026-07 conditional novelty 5.0 of 10

    In a scale-invariant R² + unimodular-gravity model, the Goldstone boson of scale symmetry becomes thawing dark energy, with its equation of state fixed by the same coupling that sets the inflationary spectral tilt.

  4. Fermi scale from quantum gravity scaling solution

    hep-th 2026-01 conditional novelty 5.0 of 10

    The Fermi/Planck ratio is claimed to be predictable from the analyticity of the quantum-gravity scaling solution for the cosmon-Higgs coupling, with numerics showing the coupling flows to a tiny, near-critical value.

  5. Spectral Noncommutative Geometry, Standard Model and all that

    hep-th 2019-06 unverdicted novelty 2.0 of 10

    Review of spectral noncommutative geometry applied to the Standard Model, including bosonic and fermionic actions, Euclidean vs Lorentz issues, and going beyond the SM.

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