Dynamically Generated Inflationary ΛCDM

Benisty, David; Guendelman, Eduardo; Nissimov, Emil; Pacheva, Svetlana

doi:10.3390/sym12030481

Cited by 14 publications

(9 citation statements)

References 158 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other studies based on inflation potentials with a non-vanishing potential minimum, such as the one shown in Ref. [79] obtained similar results.…”

Section: A Numerical Parameters and Resultssupporting

confidence: 76%

(P)reheating Effects of the Kähler Moduli Inflation I Model

Khan¹,

Vincent²,

Worthey³

2021

Preprint

View full text Add to dashboard Cite

We investigate reheating in the string-theory-motivated Kähler Moduli Inflation I (KMII) potential, coupled to a light scalar field χ and produce constraints and forecasts based on Cosmic Microwave Background (CMB) and gravitational wave observables. We implement a Markov Chain Monte Carlo (MCMC) sampling method to compute the adopted model's parameter ranges allowed by the current CMB observations. Floquet analysis and numerical lattice simulations are performed to analyze the nonlinear effects of the model's (p)reheating phase. We derive bounds on the ΛCDM parameters As, ns, nrun, and r based on Planck results, finding that correlations between model parameters severely constrain the range of these parameters allowed within this model. While the KMII potential's non-vanishing minimum may provide a possible source for the observed dark energy density ρDE this cannot be tested with current observations. We estimate the 95% CI bounds on the inflaton mass m φ and reheating temperature T reh to be 2.1 × 10 13 GeV m φ 3.2 × 10 13 GeV and T reh 1.8×10 3 GeV, respectively. We observe narrow-band self-resonance and parametric resonance instabilities in our Floquet analysis results. Finally, our lattice simulations predict stochastic gravitational wave backgrounds generated during reheating that would be observable today in the 10 9 -10 11 Hz frequency range.

show abstract

“…Other studies based on inflation potentials with a non-vanishing potential minimum, such as the one shown in Ref. [79] obtained similar results.…”

Section: A Numerical Parameters and Resultssupporting

confidence: 76%

(P)reheating Effects of the Kähler Moduli Inflation I Model

Khan¹,

Vincent²,

Worthey³

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…There is no a priori reason that GR is an exception and should be theory of gravitation from the Planck scale to the universe as a whole. Taking into account all these remarks, it follows that general relativity is not a final gravitational theory and that investigation of its extension is needed; see [5][6][7][8][9][10][11][12] and the references therein.…”

Section: Introductionmentioning

confidence: 99%

New Cosmological Solutions of a Nonlocal Gravity Model

et al. 2021

View full text Add to dashboard Cite

A nonlocal gravity model (2) was introduced and considered recently, and two exact cosmological solutions in flat space were presented. The first solution is related to some radiation effects generated by nonlocal dynamics on dark energy background, while the second one is a nonsingular time symmetric bounce. In the present paper, we investigate other possible exact cosmological solutions and find some the new ones in nonflat space. Used nonlocal gravity dynamics can change the background topology. To solve the corresponding equations of motion, we first look for a solution of the eigenvalue problem □(R−4Λ)=q(R−4Λ). We also discuss possible extension of this model with a nonlocal operator, symmetric under □⟷□−1, and its connection with another interesting nonlocal gravity model.

show abstract

“…There is no a priori reason that GR is an exception and should be theory of gravitation from the Planck scale to the universe as a whole. Taking into account all these remarks it follows that general relativity is not a final gravitational theory and that investigation of its extension is needed, e.g., see [5,6,7,8,9,10,11,12] and references therein.…”

Section: Introductionmentioning

confidence: 99%

New Cosmological Solutions of a Nonlocal Gravity Model

Dimitrijevic,

Dragovich,

Rakic

et al. 2021

Preprint

View full text Add to dashboard Cite

A nonlocal gravity model (2.1) was introduced and considered recently, [49], and two exact cosmological solutions in flat space were presented. The first solution is related to some radiation effects generated by nonlocal dynamics on dark energy background, while the second one is a nonsingular time symmetric bounce. In the present paper we investigate other possible exact cosmological solutions and find some the new ones in nonflat space. Used nonlocal gravity dynamics can change background topology. To solve the corresponding eqations of motion, we first look for a solution of the eigenvalue problem ✷(R − 4Λ) = q (R−4Λ). We also discuss possible extension of this model with nonlocal operator symmetric under ✷ ←→ ✷ −1 and its connection with another interesting nonlocal gravity model.

show abstract

Dynamically Generated Inflationary ΛCDM

Cited by 14 publications

References 158 publications

(P)reheating Effects of the Kähler Moduli Inflation I Model

(P)reheating Effects of the Kähler Moduli Inflation I Model

New Cosmological Solutions of a Nonlocal Gravity Model

New Cosmological Solutions of a Nonlocal Gravity Model

Contact Info

Product

Resources

About