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Real gauge singlet scalar extension of the Standard Model: A possible candidate for cold dark matter

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Abstract

The simplest extension of Standard Model (SM) is considered in which a real SM gauge singlet scalar with an additional discrete symmetry Z 2 is introduced to SM. This additional scalar can be a viable candidate of cold dark matter (CDM) since the stability of S is achieved by the application of Z 2 symmetry on S. Considering S as a possible candidate of CDM, Boltzmann’s equation is solved to find the freeze-out temperature and relic density of S for Higgs mass 120 GeV in the scalar mass range 5 GeV to 1 TeV. As HHSS coupling δ 2 appearing in Lagrangian depends upon the value of scalar mass m S and Higgs mass m h, the m S − δ 2 parameter space has been constrained by using the Wilkinson microwave anisotropy probe (WMAP) limit on the relic density of DM in the Universe and the results of recent ongoing DM direct search experiments, namely CDMS-II, CoGeNT, DAMA, EDELWEISS-II, XENON-10 and XENON-100. From such analyses, two distinct mass regions are found (a lower and higher mass domain) for such a DM candidate that satisfy both the WMAP limit and the experimental results considered here. The possible differential direct detection rates and annual variation of total detection rates have been estimated for this scalar DM candidate S for two detector materials, namely Ge and Xe. Finally, the γ-ray flux has been calculated from the galactic centre due to annihilation of two 130 GeV scalar DM into two monoenergetic γ-rays.

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Acknowledgements

The author AB thanks Debabrata Adak for some valuable discussions.

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Authors and Affiliations

  1. Astroparticle Physics and Cosmology Division, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata, 700 064, India

    ANIRBAN BISWAS & DEBASISH MAJUMDAR

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  1. ANIRBAN BISWAS
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  2. DEBASISH MAJUMDAR
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Correspondence to ANIRBAN BISWAS.

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BISWAS, A., MAJUMDAR, D. Real gauge singlet scalar extension of the Standard Model: A possible candidate for cold dark matter. Pramana - J Phys 80, 539–557 (2013). https://doi.org/10.1007/s12043-012-0478-z

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  • DOI: https://doi.org/10.1007/s12043-012-0478-z

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