Dark energy from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-attractors

Linder, Eric V.

doi:10.1103/physrevd.91.123012

Cited by 39 publications

(43 citation statements)

References 15 publications

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“…Here the exponential and stretching to give a flat plateau does appear. Dark energy with such α-attractors was explored in, for example, [10,11], and we will not consider standard α-attractor dark energy further, although we do discuss a new "superattractor" variant. We also note there are situations in which V may not be regular at the pole (e.g.…”

Section: Kinetic Pole and Canonical Transformationmentioning

confidence: 99%

Pole dark energy

Linder

2020

Phys. Rev. D

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Theories with a pole in the kinetic term have been used to great effect in studying inflation, owing to their quantum stability and attractor properties. We explore the use of such pole kinetic terms in dark energy theories, finding an interesting link between thawing and freezing models, and the possibility of enhanced plateaus with "superattractor"-like behavior. We assess the observational viability of pole dark energy, showing that simple models can give dark energy equation of state evolution with w(z) < −0.9 even for potentials that could not normally achieve this easily. The kinetic term pole also offers an interesting perspective with respect to the swampland criteria for such observationally viable dark energy models.

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Section: Kinetic Pole and Canonical Transformationmentioning

confidence: 99%

Pole dark energy

Linder

2020

Phys. Rev. D

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“…The generalized α-attractor model was first proposed in Ref. [9] and further studied in Refs. [17,19].…”

Section: The Generalized α-Attractor Modelmentioning

confidence: 99%

“…In this section, we will summarize the properties of this model, already studied in Ref. [9,19]. We will use the scaled field variable, ψ ≡ φ/ √ 6, introduced in Ref.…”

Section: The Generalized α-Attractor Modelmentioning

confidence: 99%

“…In this context, the dark-energy α-attractor model [9] is one of the models that try to describe both accelerated expansions in a common framework. These models typically have a scalar field in a potential with two plateaus that allow for a slow roll at early times, which produces inflation, and a freezing behavior at late times, that yields a cosmological constantlike expansion [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…However, there are other studies that try to study the connection of the late and early Universe, but focus only on the late time cosmology. Among them there are those describing dark energy as quintessence, which base their Lagrangian on an α-attractor model [9,[17][18][19][20], or those which study the relation between them and f (R) gravity, from extensions of the Starobinsky R 2 gravity [21], as in Refs. [22,23].…”

Section: Introductionmentioning

confidence: 99%

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

García-García¹,

Ruiz‐Lapuente²,

Alonso³

et al. 2019

J. Cosmol. Astropart. Phys.

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The α-attractor inflationary models are nowadays favored by CMB Planck observations. Their similarity with canonical quintessence models motivates the exploration of a common framework that explains both inflation and dark energy. We study the expected constraints that next-generation cosmological experiments will be able to impose for the dark energy α-attractor model. We systematically account for the constraining power of SNIa from WFIRST, BAO from DESI and WFIRST, galaxy clustering and shear from LSST and Stage-4 CMB experiments. We assume a tensor-to-scalar ratio, 10 −3 < r < 10 −2 , which permits to explore the wide regime sufficiently close, but distinct, to a cosmological constant, without need of fine tunning the initial value of the field. We find that the combination S4CMB + LSST + SNIa will achieve the best results, improving the FoM by almost an order of magnitude; respect to the S4CMB + BAO + SNIa case. We find this is also true for the FoM of the w 0 − w a parameters. Therefore, future surveys will be uniquely able to probe models connecting early and late cosmic acceleration.

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U(1) symmetric α-attractors

Yamada

2018

J. High Energ. Phys.

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Dark energy fromα-attractors

Cited by 39 publications

References 15 publications

Pole dark energy

Pole dark energy

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

U(1) symmetric α-attractors

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