α-attractor dark energy in view of next-generation cosmological surveys

García-García, Carlos; Ruiz‐Lapuente, P.; Alonso, David; Zumalacárregui, Miguel

doi:10.1088/1475-7516/2019/07/025

Cited by 12 publications

(4 citation statements)

References 113 publications

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“…[23], while ref. [26] performed a Bayesian forecast analysis for the same class of models in view of upcoming galaxy surveys and CMB experiments. Ref.…”

Section: Introductionmentioning

confidence: 99%

Quintessential α-attractor inflation: forecasts for Stage IV galaxy surveys

Akrami

Casas

Deng

et al. 2021

J. Cosmol. Astropart. Phys.

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Single-field models of α-attractor quintessential inflation provide a unified picture of the two periods of early- and late-time cosmic acceleration, where both inflation and dark energy are described by a single scalar degree of freedom rolling down a runaway potential. These theoretically well-motivated models have distinct observational predictions that are in agreement with existing cosmological data. We show that the next generation of large-scale structure surveys, even when no other cosmological data sets are considered, will strongly constrain the parameter space of these models, and test them against the standard cosmological model and more conventional non-quintessential inflation. In particular, we expect 𝒪(10-5-10-4) constraints on the present values of the dark energy equation of state and its time derivative, w0 and wa. We also forecast more than one order of magnitude tighter constraints on the spectral index of primordial curvature perturbations n_s compared to the expectations for the standard model. This demonstrates the powerful synergy between the upcoming large-scale structure probes of inflation and those aiming to measure the tensor-to-scalar ratio r through the observation of B-mode polarization of the cosmic microwave background.

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“…[23], while ref. [26] performed a Bayesian forecast analysis for the same class of models in view of upcoming galaxy surveys and CMB experiments. Ref.…”

Section: Introductionmentioning

confidence: 99%

Quintessential α-attractor inflation: forecasts for Stage IV galaxy surveys

Akrami

Casas

Deng

et al. 2021

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…Later on, and recently, the α-attractor potentials have been extensively applied in the study of cosmological inflation [7][8][9][10][11][12] and also in preheating [13] and reheating [14,15]. Also, the quintessential versions of the α-attractors have been applied to explain the late time acceleration of the universe [16][17][18][19] in the predictive study of the stage-IV galaxy surveys [20][21][22], as well as in the study of inflation with primodial black holes [23,24] and the superconformal E-models in brane inflation [25]. The constraints of the single-field α-attractor models are also being studied [26] in conjunction with the expected results of the upcoming CMBR experiments.…”

Section: Introductionmentioning

confidence: 99%

A novel way of constraining the α-attractor chaotic inflation through Planck data

Sarkar

Ghosh

2021

J. Cosmol. Astropart. Phys.

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Defining a scale of k-modes of the quantum fluctuations during inflation through the dynamical horizon crossing condition k = aH we go from the physical t variable to k variable and solve the equations of cosmological first-order perturbations self consistently, with the chaotic α-attractor type potentials. This enables us to study the behaviour of ns , r, nt and N in the k-space. Comparison of our results in the low-k regime with the Planck data puts constraints on the values of the α parameter through microscopic calculations. Recent studies had already put model-dependent constraints on the values of α through the hyperbolic geometry of a Poincaré disk: consistent with both the maximal supergravity model 𝒩 = 8 and the minimal supergravity model 𝒩 = 1, the constraints on the values of α are 1/3, 2/3, 1, 4/3, 5/3, 2, 7/3. The minimal 𝒩 = 1 supersymmetric cosmological models with B-mode targets, derived from these supergravity models, predicted the values of r between 10-2 and 10-3. Both in the E-model and the T-model potentials, we have obtained, in our calculations, the values of r in this range for all the constrained values of α stated above, within 68% CL. Moreover, we have calculated r for some other possible values of α both in low-α limit, using the formula r = 12α/N 2, and in the high-α limit, using the formula r = 4n/N, for n = 2 and 4. With all such values of α, our calculated results match with the Planck-2018 data with 68% or near 95% CL.

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“…[23], while Ref. [26] performed a Bayesian forecast analysis for the same class of models in view of upcoming galaxy surveys. Ref.…”

Section: Introductionmentioning

confidence: 99%

Quintessential $α$-attractor inflation: forecasts for Stage IV galaxy surveys

Akrami,

Casas,

Deng

et al. 2020

Preprint

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Single-field models of α-attractor quintessential inflation provide a unified picture of the two periods of early-and late-time cosmic acceleration, where both inflation and dark energy are described by a single scalar degree of freedom rolling down a runaway potential. These theoretically well-motivated models have distinct observational predictions that are in agreement with existing cosmological data. We show that the next generation of large-scale structure surveys, even when no other cosmological data sets are considered, will strongly constrain the parameter space of these models, and test them against the standard cosmological model and more conventional non-quintessential inflation. In particular, we expect O(10 −5 −10 −4 ) constraints on the present values of the dark energy equation of state and its time derivative, w 0 and w a . We also forecast more than one order of magnitude tighter constraints on the spectral index of primordial curvature perturbations n s compared to the expectations for the standard model. This demonstrates the powerful synergy between the upcoming large-scale structure probes of inflation and those aiming to measure the tensorto-scalar ratio r through the observation of B-mode polarization of the cosmic microwave background.

show abstract

α-attractor dark energy in view of next-generation cosmological surveys

Cited by 12 publications

References 113 publications

Quintessential α-attractor inflation: forecasts for Stage IV galaxy surveys

Quintessential α-attractor inflation: forecasts for Stage IV galaxy surveys

A novel way of constraining the α-attractor chaotic inflation through Planck data

Quintessential $α$-attractor inflation: forecasts for Stage IV galaxy surveys

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