Induced gravitational waves from slow-roll inflation after an enhancing phase

Balaji, Shyam; Domenech, Guillem; Silk, Joseph

doi:10.48550/arxiv.2205.01696

Cited by 4 publications

(5 citation statements)

References 95 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[55,73] that the spectrum of gravitational waves produced during inflation may lead to observable signals for gravitational wave detectors when the Universe undergoes a long phase of kination after inflation. Moreover, it is known that the production of primordial black holes usually goes with a secondary spectrum of gravitational waves coming from the next-to-leading order terms in perturbation theory [74]. Even if primordial black holes are produced in subdominant quantities, it may be possible for such a spectrum of induced gravitational waves to be visible by future detectors.…”

Section: Discussionmentioning

confidence: 99%

Cosmological Imprints of SUSY Breaking in Models of Sgoldstinoless Non-Oscillatory Inflation

Heurtier¹,

Moursy²,

Wacquez³

2022

Preprint

View full text Add to dashboard Cite

In supergravity, the dynamics of the sgoldstino -superpartner of the goldstino superfield associated with the breaking of supersymmetry at low energycan substantially modify the dynamics of inflation in the primordial Universe. Socalled sgoldstinoless models assume the existence of a nilpotency constraint S 2 = 0 that effectively removes the sgoldstino from the theory. Such models were proposed to realise non-oscillatory inflation scenarios with a single scalar field, which feature a long period of kination at the end of inflation, and therefore a non-standard post-inflationary cosmology. Using effective operators, we propose models in which the sgoldstino is stabilized close to the origin to reproduce the nilpotent constraint. We show that small sgoldstino fluctuations may lead to a sizeable back-reaction on the cosmological history. We study the effect of this back-reaction on the inflation observables measured in the cosmic microwave background and confront the model to a series of constraints including limits on ∆N eff . We show that the peculiar form of the potential in the large supersymmetry breaking scale limit can generate peaks in the scalar power spectrum produced from inflation. We study how certain perturbation modes may re-enter the horizon during or after kination and show that a large supersymmetry breaking scale may lead to the formation of primordial black holes with various masses in the early Universe.

show abstract

Section: Discussionmentioning

confidence: 99%

Cosmological Imprints of SUSY Breaking in Models of Sgoldstinoless Non-Oscillatory Inflation

Heurtier¹,

Moursy²,

Wacquez³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…[152]. In the GW spectrum, an obvious dip before the peak should have appeared due to the destructive interference in the convolution of the scalar perturbations, if the height of the peak were much larger than that of the other parts [170].…”

Section: B Induced Gravitational Wavesmentioning

confidence: 99%

“…The high-frequency part is a scale-invariant plateau, reflecting the final recovery of the slow-roll inflation 3 . However, such a scale-invariant GW spectrum could appear in many different mechanisms, thus can not be used to distinguish them either [164][165][166][167][168][169][170].…”

Section: B Induced Gravitational Wavesmentioning

confidence: 99%

Primordial Black Hole Formation in Starobinsky's Linear Potential Model

Wang¹

2022

Preprint

View full text Add to dashboard Cite

We study the power spectrum of the comoving curvature perturbation R in the model that glues two linear potentials of different slopes, originally proposed by Starobinsky. We find that the enhanced power spectrum reaches its maximum at the wavenumber which is π times the junction scale. The peak is ∼ 2.61 times larger than the ultraviolet plateau. We also show that its near-peak behavior can be well approximated by a constant-roll model, once we define the effective ultraslow-roll e-folding number appropriately by considering the contribution from nonsingle-clock phase only. Such an abrupt transition to non-attractor phase can leave some interesting characteristic features in the energy spectrum of the scalar-induced gravitational waves, which are detectable in the space-borne interferometers if the primordial black holes generated at such a high peak are all the dark matter.

show abstract

“…We call it the two-stage inflation. It was proposed by various people for various purposes [146][147][148][149][150][151].…”

Section: Jcap07(2024)076mentioning

confidence: 99%

Enhanced curvature perturbation and primordial black hole formation in two-stage inflation with a break

Wang,

Zhang,

Sasaki

2024

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

We investigate a model of R2-gravity with a non-minimally coupled scalar field that gives rise to two-stage inflation with a break, that is, with an intermediate stage where inflation momentarily halts. We find that the power spectrum of the primordial curvature perturbation is significantly enhanced at the break scale, which can account for the primordial black hole (PBH) formation, without affecting the CMB constraint on large scales. The behavior of the curvature perturbation is carefully analyzed and we find a few notable new features in the spectrum. In particular, we find that the k3 growth of the spectrum of toward the end of the first stage of inflation. We argue that this is a universal feature common to all two-stage models where the field dominating the second stage is heavy during the first stage. By appropriately tuning the model parameters, we find that our model can realize the scenario of PBHs as the cold dark matter of the Universe. We also find that we can choose the parameters so that the spectrum of the induced gravitational waves from the enhanced curvature perturbation fits the NANOGrav-15yr data of pulsar timing array observation.

show abstract

Induced gravitational waves from slow-roll inflation after an enhancing phase

Cited by 4 publications

References 95 publications

Cosmological Imprints of SUSY Breaking in Models of Sgoldstinoless Non-Oscillatory Inflation

Cosmological Imprints of SUSY Breaking in Models of Sgoldstinoless Non-Oscillatory Inflation

Primordial Black Hole Formation in Starobinsky's Linear Potential Model

Enhanced curvature perturbation and primordial black hole formation in two-stage inflation with a break

Contact Info

Product

Resources

About