Unity of Cosmological Inflation Attractors

Galante, Mario; Каллош, Рената; Linde, Andrei; Roest, Diederik

doi:10.1103/physrevlett.114.141302

Cited by 352 publications

(522 citation statements)

References 35 publications

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“…On the other hand, one can argue that the strength of inflation is instead that it does not depend at all on the details of the potentials, as it is a general phenomenon. This idea is particularly evident in the case of the α-attractor models [379] (see also Ref. [380]).…”

Section: Inflation and The Early Universementioning

confidence: 92%

BeyondΛCDM: Problems, solutions, and the road ahead

Bull

Akrami

Adamek

et al. 2016

Physics of the Dark Universe

459

210

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Despite its continued observational successes, there is a persistent (and growing) interest in extending cosmology beyond the standard model, ΛCDM. This is motivated by a range of apparently serious theoretical issues, involving such questions as the cosmological constant problem, the particle nature of dark matter, the validity of general relativity on large scales, the existence of anomalies in the CMB and on small scales, and the predictivity and testability of the inflationary paradigm. In this paper, we summarize the current status of ΛCDM as a physical theory, and review investigations into possible alternatives along a number of different lines, with a particular focus on highlighting the most promising directions. While the fundamental problems are proving reluctant to yield, the study of alternative cosmologies has led to considerable progress, with much more to come if hopes about forthcoming high-precision observations and new theoretical ideas are fulfilled.Keywords: cosmology -dark energy -cosmological constant problem -modified gravitydark matter -early universe Cosmology has been both blessed and cursed by the establishment of a standard model: ΛCDM. On the one hand, the model has turned out to be extremely predictive, explanatory, and observationally robust, providing us with a substantial understanding of the formation of large-scale structure, the state of the early Universe, and the cosmic abundance of different types of matter and energy. It has also survived an impressive battery of precision observational tests -anomalies are few and far between, and their significance is contentious where they do arise -and its predictions are continually being vindicated through the discovery of new effects (B-mode polarization [1] and lensing [2,3] of the cosmic microwave background (CMB), and the kinetic Sunyaev-Zel'dovich effect [4] being some recent examples). These are the hallmarks of a good and valuable physical theory.On the other hand, the model suffers from profound theoretical difficulties. The two largest contributions to the energy content at late times -cold dark matter (CDM) and the cosmological constant (Λ) -have entirely mysterious physical origins. CDM has so far evaded direct detection by laboratory experiments, and so the particle field responsible for it -presumably a manifestation of "beyond the standard model" particle physics -is unknown. Curious discrepancies also appear to exist between the predicted clustering properties of CDM on small scales and observations. The cosmological constant is even more puzzling, giving rise to quite simply the biggest problem in all of fundamental physics: the question of why Λ appears to take such an unnatural value [5,6,7]. Inflation, the theory of the very early Universe, has also been criticized for being fine-tuned and under-predictive [8], and appears to leave many problems either unsolved or fundamentally unresolvable. These problems are indicative of a crisis.From January 14th-17th 2015, we held a conference in Oslo, Norway to surve...

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Section: Inflation and The Early Universementioning

confidence: 92%

BeyondΛCDM: Problems, solutions, and the road ahead

Bull

Akrami

Adamek

et al. 2016

Physics of the Dark Universe

459

210

View full text Add to dashboard Cite

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“…The metric (4.4) has a structure that is reminiscent of the metrics encountered in single field pole inflation considered in refs. [43,44] in that it has a double pole for vanishing φ 2 . In modular inflation the boundary Im(τ ) = 0 however is not part of the domain of the inflaton field and neither the metric nor the potential are defined on the real axis of the complex plane.…”

Section: Jhep09(2017)043mentioning

confidence: 99%

Modular inflation observables and j-inflation phenomenology

Schimmrigk

2017

J. High Energ. Phys.

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Modular inflation is the restriction to two fields of automorphic inflation, a general group based framework for multifield scalar field theories with curved target spaces, which can be parametrized by the comoving curvature perturbation R and the isocurvature perturbation tensor S IJ . This paper describes the dynamics and observables of these perturbations and considers in some detail the special case of modular inflation as an extensive class of two-field inflation theories with a conformally flat target space. It is shown that the nonmodular nature of derivatives of modular forms leads to CMB observables in modular invariant inflation theories that are in general constructed from almost holomorphic modular forms. The phenomenology of the model of j-inflation is compared to the recent observational constraints from the Planck satellite and the BICEP2/Keck Array data.

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“…In this section, we show that such a pattern can be explained in the framework of the so-called "strong coupling approximation". It has been shown in a large number of analyses [89][90][91][92][93][94][95][96][97] that there are several classes of the single-field inflationary models such that within a given class all models predict the same values of observable parameters n s and r in the leading 1/N e approximation. These classes are known as cosmological attractors.…”

Section: The Strong Coupling Approximationmentioning

confidence: 99%

MSSM-inspired multifield inflation

Dubinin

Петрова

Pozdeeva

et al. 2017

J. High Energ. Phys.

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Despite the fact that experimentally with a high degree of statistical significance only a single Standard Model-like Higgs boson is discovered at the LHC, extended Higgs sectors with multiple scalar fields not excluded by combined fits of the data are more preferable theoretically for internally consistent realistic models of particle physics. We analyze the inflationary scenarios which could be induced by the two-Higgs-doublet potential of the Minimal Supersymmetric Standard Model (MSSM) where five scalar fields have non-minimal couplings to gravity. Observables following from such MSSM-inspired multifield inflation are calculated and a number of consistent inflationary scenarios are constructed. Cosmological evolution with different initial conditions for the multifield system leads to consequences fully compatible with observational data on the spectral index and the tensor-to-scalar ratio. It is demonstrated that the strong coupling approximation is precise enough to describe such inflationary scenarios.

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Unity of Cosmological Inflation Attractors

Cited by 352 publications

References 35 publications

BeyondΛCDM: Problems, solutions, and the road ahead

BeyondΛCDM: Problems, solutions, and the road ahead

Modular inflation observables and j-inflation phenomenology

MSSM-inspired multifield inflation

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