• Debtosh Chowdhury

      Articles written in Pramana – Journal of Physics

    • Results from PAMELA, ATIC and FERMI: Pulsars or dark matter?

      Debtosh Chowdhury Sudhir K Vempati Chanda J Jog

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      It is well known that dark matter dominates the dynamics of galaxies and clusters of galaxies. Its constituents remain a mystery despite an assiduous search for them over the past three decades. Recent results from the satellite-based PAMELA experiment show an excess in the positron fraction at energies between 10 and 100 GeV in the secondary cosmic ray spectrum. Other experiments, namely ATIC, HESS and FERMI, show an excess in the total electron $(e^+ + e^−)$ spectrum for energies greater than 100 GeV. These excesses in the positron fraction as well as the electron spectrum can arise in local astrophysical processes like pulsars, or can be attributed to the annihilation of the dark matter particles. The latter possibility gives clues to the possible candidates for the dark matter in galaxies and other astrophysical systems. In this article, we give a report of these exciting developments.

    • SuSeFLAV: A program for calculating supersymmetric spectra and lepton flavour violation

      Debtosh Chowdhury Raghuveer Garani Sudhir K Vempti

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      The program $\mathnormal{SuSeFLAV}$ is introduced for computing supersymmetric mass spectra with flavour violation in various supersymmetric breaking scenarios with/without see-saw mechanism. A short user guide summarizing the compilation, executables and the input files is provided.

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