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Browsing by Author "Das, Subinoy"

Browsing by Author "Das, Subinoy"

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  • Constraint on noncommutative spacetime from PLANCK data 
    Joby, P. K; Pravabati, C; Das, Subinoy (The American Physical Society, 2015-04)
    We constrain the energy scale of noncommutativity of spacetime using cosmic microwave background data from PLANCK. We find that PLANCK data put the lower bound on the noncommutativity energy scale to about 20 TeV, which ...
  • Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope 
    Biswas, Sayan; Bhattacharjee, P; Majumdar, P; Das, Subinoy; Mousumi Das; Joarder, P. S (IOP Publishing, 2017-11)
    Triangulum-II, a newly discovered dwarf spheroidal galaxy, is a strong candidate for the indirect search of dark matter through the detection of γ -ray emission that could originate from the pair- annihilation ...
  • Constraints on dark matter scenarios from measurements of the galaxy luminosity function at high redshifts 
    Corasaniti, P. S; Agarwal, S; Marsh, D. J. E; Das, Subinoy (The American Physical Society, 2017-04-15)
    We use state-of-the-art measurements of the galaxy luminosity function (LF) at z = 6, 7, and 8 to derive constraints on warm dark matter (WDM), late-forming dark matter, and ultralight axion dark matter models alternative ...
  • Constraints on the epoch of dark matter formation from Milky Way satellites 
    Das, Subinoy; Nadler, E. O (The American Physical Society, 2021-02-15)
    A small fraction of thermalized dark radiation that transitions into cold dark matter (CDM) between big bang nucleosynthesis and matter-radiation equality can account for the entire dark matter relic density. Because of ...
  • Early mass-varying neutrino dark energy: nugget formation and Hubble anomaly 
    Gogoi, Antareep; Sharma, Ravi Kumar; Chanda, Prolay; Das, Subinoy (IOP Publishing, 2021-07-10)
    We present a novel scenario in which light (~few eV) dark fermions (sterile neutrinos) interact with a scalar field as in mass-varying neutrino dark energy theories. As the eV sterile states naturally become nonrelativistic ...
  • The effects of the small-scale behaviour of dark matter power spectrum on CMB spectral distortion 
    Sarkar, A; Sethi, S. K; Das, Subinoy (IOP Publishing, 2017-07)
    After numerous astronomical and experimental searches, the precise particle nature of dark matter is still unknown. The standard Weakly Interacting Massive Particle(WIMP) dark matter, despite successfully explaining the ...
  • The effects of the small-scale DM power on the cosmological neutral hydrogen (HI) distribution at high redshifts 
    Sarkar, A; Mondal, Rajesh; Das, Subinoy; Sethi, S. K; Bharadwaj, Somnath; Marsh, D.â (IOP Publishing, 2016-04)
    JCAP04(2016)012 ou rnal of C osmology and A strop article P hysics An IOP and SISSA journal J The effects of the small-scale DM power on the cosmological neutral hydrogen (H i ) distribution at ...
  • 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 ...
  • Formation and Abundance of Late-forming Primordial Black Holes as Dark Matter 
    Chakraborty, Amlan; Chanda, Prolay K; Pandey, Kanhaiya L; Das, Subinoy (American Astronomical Society, 2022-06-20)
    We propose a novel mechanism where primordial black hole (PBH) dark matter is formed much later in the history of the universe, between the epochs of Big Bang nucleosynthesis and cosmic microwave background photon decoupling. ...
  • How CMB and large-scale structure constrain chameleon interacting dark energy 
    Boriero, Daniel; Das, Subinoy; Wong, Yvonne Y. Y (IOP Publishing, 2015-06)
    We explore a chameleon type of interacting dark matter-dark energy scenario in which a scalar field adiabatically traces the minimum of an eff ective potential sourced by the dark matter density. We discuss extensively ...
  • How late can the dark matter form in our universe? 
    Sarkar, A; Das, Subinoy; Sethi, Shiv K (IOP Publishing, 2015-03)
    We put constraints on the epoch of dark matter formation for a class of non-WIMP (Weakly Interacting Massive Particle) dark matter candidates. These models allow a fraction of Cold Dark Matter (CDM) to be formed between ...
  • Implications of an Extended Dark Energy Model with Massive Neutrinos 
    Sharma, Ravi Kumar; Pandey, Kanhaiya L; Das, Subinoy (American Astronomical Society, 2022-08-01)
    Recently there have been reports of finding a lower bound on the neutrino mass parameter (Σmν) when using the Atacama Cosmology Telescope (ACT) and SPTpol data; however, these bounds on the Σmν are still weaker for most ...
  • Mass-varying dark matter and its cosmological signature 
    Das, Anirban; Das, Subinoy; Sethi, Shiv K. (American Physical Society, 2023-10-15)
    Nontrivial dark sector physics continues to be an interesting avenue in our quest to the nature of dark matter. In this paper, we study the cosmological signatures of mass-varying dark matter where its mass changes from ...
  • Multiwavelength analysis of low surface brightness galaxies to study possible dark matter signature 
    Bhattacharjee, P; Majumdar, P; Mousumi Das; Das, Subinoy; Joarder, P. S; Biswas, Sayan (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    Low surface brightness (LSB) galaxies have very diffuse, low surface density stellar discs that appear faint in optical images. They are very rich in neutral hydrogen (H I) gas, which extends well beyond the stellar discs. ...
  • 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 ...
  • On dark matter-dark radiation interaction and cosmic reionization 
    Das, Subinoy; Mondal, Rajesh; Vikram, R; Srikanth, S (IOP Publishing, 2018-08)
    The dark matter sector of our universe can be much richer than the conventional picture of a single weakly interacting cold dark matter particle species. An intriguing possibility is that the dark matter particle interacts ...
  • 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 ...
  • Small scale clustering of late forming dark matter 
    Agarwal, S; Corasaniti, P.-S; Das, Subinoy; Rasera, Y (The American Physical Society, 2015-09-15)
    We perform a study of the nonlinear clustering of matter in the late-forming dark matter (LFDM) scenario in which dark matter results from the transition of a nonminimally coupled scalar field from radiation to collisionless ...

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