Scalaron–Higgs inflation reloaded: Higgs-dependent scalaron mass and primordial black hole dark matter

Gundhi, Anirudh; Steinwachs, Christian F.

doi:10.1140/epjc/s10052-021-09225-2

Cited by 33 publications

(14 citation statements)

References 91 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other multifield inflationary models that can produce a large bump in the PPS, although with a shape different from the one studied here, were studied in Refs. [61][62][63][64][65] As for CMB scales, instead, we always obtain a spectral index redder than Planck constraints. Specifically, we get n s = 0.9397, 0.9356, 0.9351, 0.9369, 0.9327 for the model A, B, C, D and E respectively.…”

Section: Model IIImentioning

confidence: 76%

Probing Primordial Features with the Stochastic Gravitational Wave Background

Braglia,

Chen,

Hazra

2020

Preprint

View full text Add to dashboard Cite

The stochastic gravitational wave background (SGWB) offers a new opportunity to observe signals of primordial features from inflationary models. We study their detectability with future space-based gravitational waves experiments, focusing our analysis on the frequency range of the LISA mission. We compute gravitational wave spectra from primordial features by exploring the parameter space of a two-field inflation model capable of generating different classes of features. Fine-tuning in scales and amplitudes is necessary for these signals to fall in the observational windows. Once they show up, several classes of frequency-dependent oscillatory signals, characteristic of different underlying inflationary physics, may be distinguished and the SGWB provides a window on dynamics of the primordial universe independent of cosmic microwave background and large-scale structure. To connect with future experimental data, we discuss two approaches of how the results may be applied to data analyses. First, we discuss the possibility of reconstructing the signal with LISA, which requires a high signal-to-noise ratio. The second more sensitive approach is to apply templates representing the spectra as estimators. For the latter purpose, we derive templates that can accurately capture the spectral features of several classes of feature signals and compare them with the SGWB produced by other physical mechanisms.

show abstract

Section: Model IIImentioning

confidence: 76%

Probing Primordial Features with the Stochastic Gravitational Wave Background

Braglia,

Chen,

Hazra

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…However, it is not easy to achieve the big enhancement on the power spectrum while keeping the total number of e-folds around 50 − 60 [53,54]. Noncanonical kinetic terms inflation or other kinds of noncanonical inflation models were then considered [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72]. For example, with the coupling function f (φ) and potential satisfying (V φ +V 2 f φ /6)| φ=φc ≈ 0, the Gauss-Bonnet inflation model has a transient ultra-slowroll process at the critical point φ c [69,70] and succeeds in enhancing the power spectrum and produce PBHs.…”

Section: Introductionmentioning

confidence: 99%

Primordial black holes and scalar-induced gravitational waves from scalar-tensor inflation

Zhu¹

2022

Preprint

View full text Add to dashboard Cite

The power spectrum of the scalar-tensor inflation with a quadratic form Ricci scalar coupling function Ω(φ) = 1 − 2φ/φc + (1 + δ 2 )(φ/φc) 2 can be enhanced enough to produce primordial black holes and generate scalar-induced gravitational waves. The masses of primordial black holes and the frequencies of scalar-induced gravitational waves are controlled by the parameter φc, and their amplitudes are determined by the parameter δ. Primordial black holes with stellar masses, planetary masses, and masses around 10 −12 M are produced and their abundances are obtained from the peak theory. The frequencies of the corresponding scalar-induced gravitational waves are around 10 −9 Hz, 10 −6 Hz, and 10 −3 Hz, respectively. The primordial black holes with masses around 10 −12 M can account for almost all of the dark matter, and the scalar-induced gravitational waves with frequencies around 10 −9 Hz can explain the NANOGrav 12.5yrs signal.

show abstract

“…Processes induced by inflation gained much interest with a localized enhancement in the curvature power spectrum [10,11,, in correlation with copious primordial black hole (PBH) production [60][61][62]. 1 Among many inflationary models, Higgs inflation [64] and its extensions [45,55, gain immense interest as it incorporates the Standard Model scalar with a nonminimal coupling to gravity, and it provides the best fit to current CMB observations. The running behavior of the Standard Model Higgs is also incorporated in the potential, which prospects numerous phenomena in our cosmology [70,73,77].…”

Section: Introductionmentioning

confidence: 99%

The Inflaton that Could : Primordial Black Holes and Second Order Gravitational Waves from Tachyonic Instability induced in Higgs-$R^2$ Inflation

Cheong,

Kohri,

Park

2022

Preprint

View full text Add to dashboard Cite

The running of the Higgs self coupling may lead to numerous phenomena in early universe cosmology. In this paper we introduce a scenario where the Higgs running induces turns in the trajectory passing a region with tachyonic mass, leading to a temporal tachyonic growth in the curvature power spectrum. This effect induced by the Higgs leaves phenomena in the form of primordial black holes and stochastic gravitational waves, where proposed GW observatories will be able to probe in the near future.

show abstract

Scalaron–Higgs inflation reloaded: Higgs-dependent scalaron mass and primordial black hole dark matter

Cited by 33 publications

References 91 publications

Probing Primordial Features with the Stochastic Gravitational Wave Background

Probing Primordial Features with the Stochastic Gravitational Wave Background

Primordial black holes and scalar-induced gravitational waves from scalar-tensor inflation

The Inflaton that Could : Primordial Black Holes and Second Order Gravitational Waves from Tachyonic Instability induced in Higgs-$R^2$ Inflation

Contact Info

Product

Resources

About