Linear inflation from quartic potential

Kannike, Kristjan; Racioppi, Antonio; Raidal, M.

doi:10.1007/jhep01(2016)035

Cited by 70 publications

(119 citation statements)

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“…The weak scale, the QCD scale and the Planck scale can be dynamically generated [4] from vacuum expectation values or from condensates. Perturbative dimensionless theories automatically give slow-roll inflation [4][5][6][7][8][9] (see also refs. [10,11] for related studies).…”

Section: Introductionmentioning

confidence: 99%

Agravity up to infinite energy

2018

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The self-interactions of the conformal mode of the graviton are controlled, in dimensionless gravity theories (agravity), by a coupling f 0 that is not asymptotically free. We show that, nevertheless, agravity can be a complete theory valid up to infinite energy. When f 0 grows to large values, the conformal mode of the graviton decouples from the rest of the theory and does not hit any Landau pole provided that scalars are asymptotically conformally coupled and all other couplings approach fixed points. Then agravity can flow to conformal gravity at infinite energy. We identify scenarios where the Higgs mass does not receive unnaturally large physical corrections. We also show a useful equivalence between agravity and conformal gravity plus two extra conformally coupled scalars, and we give a simpler form for the renormalization group equations of dimensionless couplings as well as of massive parameters in the presence of the most general matter sector.

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Section: Introductionmentioning

confidence: 99%

Agravity up to infinite energy

2018

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“…To-date, many review articles [7][8][9] have attempted to classify the viable models of inflation according to various criteria, most commonly by their theoretical origin. Interestingly, despite the different starting points, there are known cases [10][11][12][13][14][15][16][17][18][19] of seemingly different models that give identical predictions for the inflationary parameters currently constrained by experiments, such as the spectral index n s and the tensorto-scalar ratio r. It could then be sustained that in the current descriptions of inflation there is a redundancy which unnecessarily complicates the landscape of viable frameworks and obscures the understanding of the underlying mechanism.…”

Section: Introductionmentioning

confidence: 99%

Frame-Independent Classification of Single-Field Inflationary Models

et al. 2017

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Seemingly unrelated models of inflation that originate from different physical setups yield, in some cases, identical predictions for the currently constrained inflationary observables. In order to classify the available models, we propose to express the slow-roll parameters and the relevant observables in terms of frame and reparametrisation invariant quantities. The adopted invariant formalism makes manifest the redundancy that afflicts the current description of inflation dynamics and offers a straightforward way to identify classes of models which yield identical phenomenology. In this Letter we offer a step-to-step recipe to recast every single field inflationary model in the proposed formalism, detailing also the procedure to compute inflationary observables in terms of frame and reparametrisation invariant quantities. We hope that our results become the cornerstone of a new categorisation of viable inflationary models and open the way to a deeper understanding of the inflation mechanism.

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“…In particular, first in [14] it was shown that the predictions of linear inflation for the observables can be achieved in the context of well-defined quantum field theory, without introducing complicated interactions by hand. Then in [15] the authors extended the previous discussion, presenting a more detailed study of the parameter space, and they also added a discussion of reheating.…”

Section: Introductionmentioning

confidence: 97%

“…The linear inflaton a e-mail: grigorios.panotopoulos@tecnico.ulisboa.pt potential is still in agreement with observations, but difficult to realize in particle physics models. However, recently it was shown that the Coleman-Weinberg potential [13] together with a nonminimal coupling of the inflaton to gravity leads to attractor solutions that interpolate between quadratic inflation, which is ruled out by recent measurements, and linear inflation, which lies within the allowed region [14,15]. In particular, first in [14] it was shown that the predictions of linear inflation for the observables can be achieved in the context of well-defined quantum field theory, without introducing complicated interactions by hand.…”

Section: Introductionmentioning

confidence: 99%