Natural inflation with hidden scale invariance

Barrie, Neil D.; Kobakhidze, Archil; Liang, Shelley

doi:10.1016/j.physletb.2016.03.056

Cited by 57 publications

(51 citation statements)

References 34 publications

(62 reference statements)

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“…12 The opposite case M 2 M P obviously does not create phenomenological problems because it corresponds to a ghost decoupled for energies below the Planck scale.…”

Section: Discussionmentioning

confidence: 99%

“…They lead to naturally flat inflationary potentials [3,[7][8][9][10][11][12][13] and dark matter candidates [10,[14][15][16][17] and represent an interesting framework to address the hierarchy problem [3,4,10,14,16,[18][19][20][21][22][23][24][25]. This no-scale principle has also the virtue of being predictive as only dimension-four operators are allowed in the classical Lagrangian, which can be viewed as a strong constraint on the allowed free parameters.…”

Section: Introductionmentioning

confidence: 99%

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Inflationary perturbations in no-scale theories

Salvio

2017

Eur. Phys. J. C

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We study the inflationary perturbations in general (classically) scale-invariant theories. Such scenario is motivated by the hierarchy problem and provides natural inflationary potentials and dark matter candidates. We analyse in detail all sectors (the scalar, vector and tensor perturbations) giving general formulae for the potentially observable power spectra, as well as for the curvature spectral index n s and the tensor-to-scalar ratio r . We show that the conserved Hamiltonian for all perturbations does not feature negative energies even in the presence of the Weyl-squared term if the appropriate quantisation is performed and argue that this term does not lead to phenomenological problems at least in some relevant setups. The general formulae are then applied to a concrete no-scale model, which includes the Higgs and a scalar, "the planckion", whose vacuum expectation value generates the Planck mass. Inflation can be triggered by a combination of the planckion and the Starobinsky scalar and we show that no tension with observations is present even in the case of pure planckion inflation, if the coefficient of the Weyl-squared term is large enough. In general, even quadratic inflation is allowed in this case. Moreover, the Weyl-squared term leads to an isocurvature mode, which currently satisfies the observational bounds, but it may be detectable with future experiments.

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“…12 The opposite case M 2 M P obviously does not create phenomenological problems because it corresponds to a ghost decoupled for energies below the Planck scale.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inflationary perturbations in no-scale theories

Salvio

2017

Eur. Phys. J. C

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“…Hence, the gravi-leptogenesis mechanism address the source of the CP violation to the gravitational ChernSimons interaction added to the Einstein-Hilbert action. (Alternative inflationary baryogenesis scenarios based on using U(1) gauge fields has been introduced in [10] and [11]. )…”

Section: Introductionmentioning

confidence: 99%

Chiral gravity waves and leptogenesis in inflationary models with non-Abelian gauge fields

Maleknejad

2014

Phys. Rev. D

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We present a leptogenesis scenario associated with inflationary models involving non-Abelian gauge fields within the standard model of particle physics (SM). We show that this class of inflationary models generates intrinsic birefringent gravitational waves that following [8], through the gravitational chiral anomaly in SM, can naturally create a net lepton number density. The CP violating interaction is produced by tensor fluctuations of the gauge field, while the efficiency of this process is determined by the effective background value of the gauge field. We demonstrate that this mechanism can create the observed value of baryon to photon number density in a natural range of parameters of these models.

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“…If our proposal is correct and assuming no further production of entropy 2 , the baryon asymmetry (9) has to match with the observed values at experiments (1). The largest scales at which the imbalance between matter and antimatter is observed can be deduced from nonobservation of distortion of CMB radiation.…”

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confidence: 65%

“…Furthermore, a similar mechanism can be used to generate asymmetric dark matter during inflation, e.g., along the lines discussed in Ref. [9].…”

mentioning

confidence: 99%