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Browsing by Author "Maharana, Anshuman"

Browsing by Author "Maharana, Anshuman"

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  • A faster growth of perturbations in an early matter dominated epoch: primordial black holes and gravitational waves 
    Das, Subinoy; Maharana, Anshuman; Muia, Francesco (Oxford University Press on behalf of Royal Astronomical Society, 2022-09)
    We present a scenario for fast growth of cosmological perturbations; δ(t) ∼ a(t)s, a(t) being the scale factor, with s > 10 for the numerical examples reported in this article. The basic ingredients of the scenario are an ...
  • Nonthermal hot dark matter from inflaton or moduli decay: Momentum distribution and relaxation of the cosmological mass bound 
    Bhattacharya, Sukannya; Das, Subinoy; Dutta, Koushik; Gangopadhyay, Mayukh Raj; Mahanta, Ratul; Maharana, Anshuman (American Physical Society, 2021-03-15)
    Decay of the inflaton or moduli which dominated the energy density of the universe at early times leads to a matter to radiation transition epoch. We consider nonthermal sterile dark matter (DM) particles produced as decay ...
  • Nonthermal neutrino-like hot dark matter in light of the S8 tension 
    Das, Subinoy; Maharana, Anshuman; Poulin, Vivian; Sharma, Ravi Kumar (American Physical Society, 2022-05-15)
    The Λ CDM prediction of S 8 ≡ σ 8 ( Ω m / 0.3 ) 0.5 —where σ 8 is the root mean square of matter fluctuations on an 8     h − 1   Mpc scale—once calibrated on Planck cosmic microwave ...
  • Nonthermal warm dark matter limits from small-scale structure 
    Banerjee, Arka; Das, Subinoy; Maharana, Anshuman; Nadler, Ethan O.; Sharma, Ravi Kumar (American Physical Society, 2023-08-15)
    We present small-scale structure constraints on sterile dark matter produced from a heavy mediator particle, inspired by models of moduli decay. Dark matter particles produced through this mechanism can contribute to the ...
  • Signatures of Light Massive Relics on non-linear structure formation 
    Banerjee, Arka; Das, Subinoy; Maharana, Anshuman; Sharma, R. K (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    Cosmologies with Light Massive Relics (LiMRs) as a subdominant component of the dark sector are well-motivated from a particle physics perspective, and can also have implications for the σ8 tension between early and late ...

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