Primordial non-Gaussianity as a saviour for PBH overproduction in SIGWs generated by pulsar timing arrays for Galileon inflation
Choudhury S. Dey K. Karde A. Panda S. Sami M.
September 2024Elsevier B.V.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
2024#856
We investigate the explicit role of negative local non-Gaussianity, fNL, in suppressing the abundance of primordial black holes (PBHs) in the single-field model of Galileon inflation. PBH formation requires significantly enhancing the scalar power spectrum, which greatly affects their abundance. The associated frequencies in the nHz regime are also sensitive to the generation of scalar-induced gravitational waves (SIGWs) which may explain the current data from the pulsar timing arrays (PTAs). Our analysis using the threshold statistics on the compaction function demonstrates that Galileon theory not only avoids PBH overproduction using the curvature perturbation enhancements that give fNL∼O(−6), but also generates SIGWs that conform well with the PTA data.
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Centre For Cosmology and Science Popularization (CCSP), SGT University, Gurugram, Haryana, Delhi - NCR, 122505, India
School of Physical Sciences, National Institute of Science Education and Research, Odisha, Bhubaneswar, 752050, India
Center for Theoretical Physics, Eurasian National University, Astana, 010008, Kazakhstan
Chinese Academy of Sciences, 52 Sanlihe Rd, Xicheng District, Beijing, China
Centre For Cosmology and Science Popularization (CCSP)
School of Physical Sciences
Center for Theoretical Physics
Chinese Academy of Sciences
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