English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We study the process of the Primordial Black Holes (PBHs) production in thenovel framework, namely $\alpha$-attractor Galileon inflation (G-inflation)model. In our framework, we take the Galileon function as$G(\phi)=G_{I}(\phi)\left(1+G_{II}(\phi)\right)$, where the part $G_{I}(\phi)$is motivated from the $\alpha$-attractor inflationary scenario in its originalnon-canonical frame, and it ensures for the model to be consistent with thePlanck 2018 observations at the CMB scales. The part $G_{II}(\phi)$ is invokedto enhance the curvature perturbations at some smaller scales which in turngives rise to PBHs formation. By fine-tuning of the model parameters, we findthree parameter sets which successfully produce a sufficiently large peak inthe curvature power spectrum. We show that these parameter sets produce PBHswith masses ${\cal O}(10)M_\odot$, ${\cal O}(10^{-5})M_\odot$, and ${\calO}(10^{-13})M_\odot$ which can explain the LIGO events, theultrashort-timescale microlensing events in OGLE data, and around $0.98\%$ ofthe current Dark Matter (DM) content of the universe, respectively.Additionally, we study the secondary Gravitational Waves (GWs) in our setup andshow that our model anticipates the peak of their present fractional energydensity as $\Omega_{GW0} \sim 10^{-8}$ for all the three parameter sets, but atdifferent frequencies. These predictions can be located well inside thesensitivity region of some GWs detectors, and therefore the compatibility ofour model can be assessed in light of the future data. We further estimate thetilts of the included GWs spectrum in the different ranges of frequency, andconfirm that spectrum follows the power-law relation $\Omega_{GW0}\sim f^{n}$in those frequency bands.

Mechanism of primordial black holes production and secondary gravitational waves in $\alpha$-attractor Galileon inflationary scenario