Standard Model mass spectrum in inflationary universe

Chen, Xingang; Wang, Yi; Xianyu, Zhong-Zhi

doi:10.1007/jhep04(2017)058

Cited by 88 publications

(115 citation statements)

References 128 publications

(251 reference statements)

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“…Similar correction has been noticed in the context of cosmological colliders as a contamination[16,17].…”

supporting

confidence: 78%

On the inflationary massive field with a curved field manifold

Wang

2020

J. Cosmol. Astropart. Phys.

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Massive fields during inflation provide an interesting opportunity to test new physics at very high energy scales. Meanwhile in fundamental realizations, the inflationary field space typically has a curved geometry, which may leave detectable imprints in primordial observables. In this paper we study an extension of quasi-single field inflation where the inflaton and the massive field belong to a curved field manifold. Because of the nontrivial field space curvature, the massive field here can get significant mass corrections of order the Hubble scale, thus the quasi-single field predictions on primordial non-Gaussianity are affected. We derive the same result in an equivalent approach by using the background effective field theory of inflation, where a dimension-6 operator is identified to play an important role and its cutoff scale is associated with the curvature scale of the field space. In addition, due to the slow-roll evolution of the inflaton, this type of mass correction has intrinsic time-dependence. Consequently, the running mass modifies the scaling behaviour in the squeezed limit of the scalar bispectrum, while the resulting running index measures the curvature of the internal field space. Therefore the minimal setup of a massive field within curved field space during inflation may naturally lead to new observational signatures of the field space geometry.

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“…Similar correction has been noticed in the context of cosmological colliders as a contamination[16,17].…”

supporting

confidence: 78%

On the inflationary massive field with a curved field manifold

Wang

2020

J. Cosmol. Astropart. Phys.

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“…This will then allow smaller Λ σ and larger NG. It would also be very interesting to analyze all the "heavy-lifted" SM signals [10][11][12]16], especially the signal due to the loops of massive W bosons, in the curvaton scenario that was presented in this work. Using the above and eq.…”

Section: Discussionmentioning

confidence: 99%

“…Through a careful measurement of such dependencies, one can infer the mass and spin of such heavy particles-a rare opportunity to probe on-shell physics at very high energy scales. This is the focus of the "cosmological collider physics" program [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. For various recent ideas in this direction see, [18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Cosmological collider physics and the curvaton

Kumar

Sundrum

2020

J. High Energ. Phys.

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Primordial non-Gaussianity signatures of extremely heavy particles are reexamined within a simple alternative to the standard inflationary paradigm, in which the primordial fluctuations and the inflationary spacetime expansion are sourced by two different fields. The curvaton scenario provides an example of this in which the distinct roles are played by the curvaton and the inflaton fields, respectively. We study couplings of the curvaton to heavy particles with masses of order the inflationary Hubble scale, and show that they can lead to non-Gaussian signals orders of magnitude larger than those in standard inflation, consistent with explicit effective field theory control of inflationary dynamics. This brings various motivated particle physics signatures, such as loops of heavy gauge-charged scalars and fermions, within future observational reach. The curvaton paradigm can be viewed as a partial UV completion of effective field theories of only inflationary fluctuations in which large non-Gaussian signals of heavy particles have also been discussed, but in which inflationary dynamics is not explicitly derived.

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“…Following [16], and from the observational point of view, we can classify the huge number of different models of inflation into three main categories, with their related sub-categories. These are the single-field inflation [61][62][63][64][65][66][67][68][69][70][71][72][73][74], the multiple-field inflation [75][76][77][78][79][80][81][82] and those models in which the fluid is not described by scalar fields [83][84][85][86][87].…”

Section: Introductionmentioning

confidence: 99%

Constraining chameleon field driven warm inflation with Planck 2018 data

et al. 2019

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We investigate warm inflationary scenario in which the accelerated expansion of the early Universe is driven by chameleon-like scalar fields. Due to the non-minimal coupling between the scalar field and the matter sector, the energy-momentum tensor of each fluid component is not conserved anymore, and the generalized balance equation is obtained. The new source term in the energy equation can be used to model warm inflation. On the other hand, if the coupling function varies slowly, the model reduces to the standard model used for the description of cold inflation. To test the validity of the warm chameleon inflation model, the results for warm inflationary scenarios are compared with the observational Planck2018 Cosmic Microwave Background data. In this regard, the perturbation parameters such as the amplitude of scalar perturbations, the scalar spectral index and the tensor-to-scalar ratio are derived at the horizon crossing in two approximations, corresponding to the weak and strong dissipative regimes. As a general result it turns out that the theoretical predictions of the chameleon warm inflationary scenario are consistent with the Planck 2018 observations.

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Standard Model mass spectrum in inflationary universe

Cited by 88 publications

References 128 publications

On the inflationary massive field with a curved field manifold

On the inflationary massive field with a curved field manifold

Cosmological collider physics and the curvaton

Constraining chameleon field driven warm inflation with Planck 2018 data

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