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Debasish Majumdar

Name: Debasish Majumdar

Designation: Professor

Contact address:

91-33-2335-5705,

Academic Qualifications

  • PhD : The M.S. University of Baroda, Vadodara, 1995
  • MSc : Visva Bharati University, 1988
  • BSc (Hons.) : University of Calcutta, 1985

Previous Appointments

  • Research Scholar at Theory Division, Physical Research Laboratory, Ahmedabad, India, Aug. 1988 – Dec. 1994.
  • Post Doctoral Fellow at Theory Division, Physical Research Laboratory, Ahmedabad, India, Dec. 1994 – Apr. 1995.
  • Post Doctoral Fellow at Institute of Physics, Bhubaneswar, India, Apr. 1995 – Jun 1997.
  • Research Associate at Department of Physics, University of Calcutta, Kolkata, India, Jun 1997 – Apr 2000.
  • Post Doctoral Fellow at Theory Division, Saha Institute of Nuclear Physics, Kolkata, India, May 2000 – Apr. 2003.
  • Visiting Scientist at India-based Neutrino Observatory Section, Saha Institute of Nuclear Physics, Kolkata, India, May 2003 – Apr. 2005.
  • Faculty at Saha Institute of Nuclear Physics, Apr 2005 – October 2023 (Theory Division, Superannuated as Senior Professor H)

Research interests (active)

  • Particle Dark Matter phenomenology
  • Direct and indirect detection of Dark Matter
  • Dark Matter annihilation (in masive bodies) and signals (excess gamma, neutrinos, positrons, synchrotron etc.)
  • Primordial Gravitational waves from first order phase transition (FWPT) and domain wall annihilation
  • Neutrino Oscillation physics, CP violation. mass hierarchy. Non-standard interactions (NSI) and decoherence effects in neutrinos
  • Primordial Black Holes or PBH. 21cm line cosmology.
  • Dark Energy from f(R) gravity

Research Guidance

Eight (8) students completed (and awarded) PhD degree under my supervision. One (1) student is nearing completion.

Other Guidance

Supervised various summer students and MSc dissertations from other universities/institutes.

Teaching

  • Regular teaching in and outside the home institute. Courses taken (for pre-PhD Post MSC (PMSc) students include particle physics, quantum mechanics, astroparticle physics etc. Outside the institute – Special paper (Astroparticle physics) for MSc at St Xavier’s College Kolkata, Quantum Mechanics (MSc) at Presidency University etc.
  • Delivered courses on Dark Matter, neutrinos, astroparticle physics in various Schools organised by relevant authorities.

Books

Published one book on Dark Matter and several reports and monographs on Neutrinos.

  • Dark Matter: An Introduction, by Debasish Majumdar, CRC Press, Taylor and Francis, (2014), 263pp. (BOOK)
  • ICAL at INO Collaboration, Shakeel Ahmed et al. Pramana 88 (2017) 5, 79 “Physics Potential of the ICAL detector at the India-based Neutrino Observatory (INO)”. 3. International Design Study for the Neutrino Factory, Interim Design Report IDS-NF Collaboration, Mar 2011. 271 pp. IDS-NF-20, BNL96453-2011, CERN-ATS-2011- 216, EURONU-WP1-05, FERMILABPUB-11-581-APC, RAL-TR-2011-018, FERMILABDESIGN-2011-01.
  • India-based Neutrino Observatory: Project Report. Volume I. INOCollaboration (M.Sajjad Athar (Aligarh Muslim U.) et al.). May 2006. 233 pp. INO2006-01.
  • Debasish Majumdar, Dark Matter – Possible Candidates and Direct Detection in Physics and Astrophysics of Hadrons and Hadronic Matter, Ed. A.B. Santra, Narosa Publishers, (2008) p. 319.

Organisation of Scientific Events

Organised various national (and international) conferences and workshops such as AAPCOS (conf. series), WIN07 etc. Organised SERC Main School in Theoretical High Energy Physics as School director, September, 2012. Also organised outreach programmes for school and college students.

Contribution to National/International issues

  • Involved in theoretical aspects of a project related to Dark matter detection at Jaduguda Underground Science Laboratory (JUSL) at Jaduguda. It mainly invololved the Physics issues of the said experiment and finding out the bounds on dark matter mass and cross-sections given the background and threshold of the detector.
  • Involved in the neutrino project India-based neutrino observatory or INO. Detector simu-lations and physics issues related to ICAL (iron calorimeter) detector at INO are pursued.
  • Involved in study (theoretically) of new physics effects on neutrino oscillation physics at a future long baseline neutrino experiment namely ESSSB project (European Spallation Source Neutrino Superbeam) collaboration as external member.

List of publications in refereed journals

  1. Aman Gupta, Suprabh Prakash, Debasish Majumdar, Proceedings of Science (EPS-HEP 2023) (2024) 170 “Constraining the Scalar Non-Standard Interactions in Neutrino Oscillation Experiment”.
  2. Upala Mukhopadhyay, Debasish Majumdar, Ashadul Halder, JCAP 10 (2022) 099 “Con-straining PBH mass distributions from 21cm brightness temperature results and an an-alytical mapping between probability distribution of 21cm signal and PBH masses”.
  3. Aman Gupta, Debasish Majumdar, Ashadul Halder, Mod. Phys. Lett. A 37 (2022) 35n36 “KM3NeT upper bounds of detection rates of solar neutrinos from annihilations of dark matter at the solar core”.
  4. Ashadul Halder, Madhurima Pandey, Debasish Majumdar, Rupa Basu, JCAP 10 (2021), 033 Exploring multimessenger signals from heavy dark matter decay with EDGES 21-cm result and IceCube.
  5. Upala Mukhopadhyay, Debasish Majumdar, Kanan K. Datta, LHEP 2021 (2021) Explaining the results of EDGES observation of 21cm line with Dark Matter-Dark Energy and Dark Matter-Baryon interactions.
  6. Madhurima Pandey, Debasish Majumdar, Amit Dutta Banik, Ashadul Halder, Mod. Phys. Lett. A 36 (2021) 35, 2150243 The violation of equivalence principle and four neutrino oscillations for long baseline neutrinos.
  7. Avik Paul, Upala Mukhopadhyay, Debasish Majumdar, JHEP 05 (2021) 223. Gravitational Wave Signatures from Domain Wall and Strong First-Order Phase Transitions in a Two Complex Scalar extension of the Standard Model.
  8. Sayan Ghosh, Amit Dutta Banik, Eung Jin Chun, Debasish Majumdar, Phys. Rev. D 104 (2021) 075016. Pseudoscalar-portal Dark Matter in the Light of AMS-02 positron excess.
  9. Ashadul Halder, Shibaji Banerjee, Madhurima Pandey, Debasish Majumdar, Mon. Not. Roy. Astron. Soc. (MNRAS) 500 (2020) 55895602. Addressing -ray emissions from dark matter annihilations in 45 Milky Way satellite galaxies and in extragalactic sources with particle dark matter models.
  10. Upala Mukhopadhyay, Debasish Majumdar, Kanan K. Datta, Phys. Rev. D 103, 063510 (2021). Probing interacting dark energy and scattering of baryons with dark matter in light of the EDGES 21-cm signal.
  11. Tista Mukherjee, Madhurima Pandey, Debasish Majumdar, Ashadul Halder, Int. J. Mod. Phys. A 36 (2021) 13, 2150078. Estimation of Baryon Asymmetry from Dark Matter Decaying into IceCube Neutrinos.
  12. Rupa Basu, Madhurima Pandey, Debasish Majumdar and Shibaji Banerjee, Int. J. Mod. Phys. A 36 (2021) 13, 2150163. Bounds on dark matter annihilation cross-sections from inert doublet model in the context of 21-cm cosmology of dark ages.
  13. Debasish Majumdar, Upala Mukhopadhyay, Proc. of Sc. (PoS EPS-HEP2019), 063 (2020). “Perturbations for Slotheon Field Dark Energy and its Evolution”
  14. Upala Mukhopadhyay, Avik Paul, Debasish Majumdar, Eur. Phys. J. C80, 904 (2020). “Addressing the high- problem in pseudo-Nambu-Goldstone boson dark energy models with dark matterdark energy interaction”.
  15. Upala Mukhopadhyay, Debasish Majumdar, Debabrata Adak, Eur. Phys. J. C80, 593 (2020). “Evolution of Dark Energy Perturbations for Slotheon Field and Power Spectrum”
  16. Prabir Banik, Arunava Bhadra, Madhurima Pandey, Debasish Majumdar, Phys. Rev. D 101, 063024 (2020). “Implications of a proton blazar inspired model on correlated observations of neutrinos with gamma-ray flaring blazars”.
  17. Madhurima Pandey, Debasish Majumdar, Ashadul Halder, Phys. Lett. B 797, 134910
    (2019). “Mass and life time of heavy dark matter decaying into IceCube PeV neutrinos”.
  18. Avik Paul, Biswajit Banerjee, Debasish Majumdar, JCAP 1910, 062 (2019). “Gravitational wave signatures from an extended inert doublet dark matter model”.
  19. Upala Mukhopadhyay, Debasish Majumdar, Phys. Rev. D 100, 024006 (2019). “Swampland criteria in the slotheon field dark energy”.
  20. Avik Paul, Debasish Majumdar and Amit Dutta Banik, JCAP 1905 029 (2019). “Signatures of synchrotron radiation from the annihilation of dark matter at the Galactic Centre”.
  21. Avik Paul, Debasish Majumdar and Kamakshya Prasad Modak, Pramana 92, 44 (2019). “Neutron Star Cooling via Axion Emission by Nucleon-Nucleon Axion Bremsstrahlung”.
  22. Madhurima Pandey, Debasish Majumdar and Kamakshya Prasad Modak, JCAP 1806 023 (2018). “Two Component Feebly Interacting Massive Particle (FIMP) Dark Matter”.
  23. Madhurima Pandey, Debasish Majumdar and Amit Dutta Banik, Phys. Rev. D 97, 103015 (2018). “Probing a four flavor vis-a-vis three flavor neutrino mixing for ultrahigh energy neutrino signals at a 1 km2 detector”.
  24. Amit Dutta Banik, Madhurima Pandey, Debasish Majumdar and Anirban Biswas, Eur. Phys. J. C77, 657 (2017). “Two component WIMP-FImP dark matter model with singlet fermion, scalar and pseudo scalar”.
  25. Debasish Majumdar, Amit Dutta Banik, Anirban Biswas, Pramana 89, 67 (2017). “Exploring a hidden fermionic dark sector”
  26. Debasish Majumdar in Pramana 88, 79 (2017), “Physics Potential of the ICAL detector at the India-based Neutrino Observatory (INO)”, ICAL Collaboration (Shakeel Ahmed (Aligarh Muslim U.) et al.), 134 pp. (INO-ICAL-PHY-NOTE-2015-01).
  27. Amit Dutta Banik, Debasish Majumdar, Anirban Biswas, Eur. Phys. J. C76, 346 (2016). “Possible explanation of indirect gamma ray signatures from hidden sector fermionic dark matter”.
  28. Anirban Biswas, Debasish Majumdar, Probir Roy, Eur. Phys. Lett. 113, 29001 (2016). “Dwarf galaxy γ-excess and 3.55 keV X-ray line in a nonthermal Dark Matter model”.
  29. Debasish Majumdar, Kamakshya Prasad Modak, Subhendu Rakshit, Pramana 86, 343 (2016). “A two-component dark matter model with real singlet scalars confronting GeV γ-ray excess from galactic centre and Fermi bubble”.
  30. Kamakshya Prasad Modak, Debasish Majumdar Astrophys. J. Suppl. 219 37 (2015). “Confronting Galactic and Extragalactic gamma-ray observed by Fermi-LAT with Annihilating Dark Matter in Inert Higgs Doublet Model”.
  31. Anirban Biswas, Debasish Majumdar, Probir Roy JHEP 1504, 065 (2015). “Nonthermal two component dark matter model for Fermi-LAT -ray excess and 3.55 keV X-ray line”.
  32. Amit Dutta Banik, Debasish Majumdar, Phys. Lett. B 743, 420 (2015). “Low Energy Gamma Ray Excess Confronting a Singlet Scalar Extended Inert Doublet Dark Matter Model”.
  33. Kamakshya Prasad Modak, Debasish Majumdar, Subhendu Rakshit, JCAP 1503, 011 (2015). “A Possible Explanation of Low Energy gamma-ray Excess from Galactic Centre and Fermi Bubble by a Dark Matter Model with Two Real Scalars”.
  34. Amit Dutta Banik, Debasish Majumdar, Mod. Phys. Lett. A 30, 1550001 (2014). “Velocity Induced Neutrino Oscillation and its Possible Implications for Long Baseline Neutrinos”.
  35. Debabrata Adak, Debasish Majumdar, Supratik Pal, Mon. Not. Roy. Astron. Soc. 437, 831 (2014), “Generalizing thawing dark energy models: the standard vis-à-vis model independent diagnostics”.
  36. Amit Dutta Banik, Debasish Majumdar, Eur. Phys. J. C74, 3142 (2014), “Inert Doublet Dark Matter with an additional scalar singlet and 125 GeV Higgs Boson”.
  37. Debabrata Adak, Amna Ali, Debasish Majumdar Phys. Rev. D 88, 024007 (2013), “Late time acceleration in a slow moving galileon field”.
  38. Anirban Biswas, Debasish Majumdar, Arunansu Sil, Pijushpani Bhattacharjee, JCAP 1312, 049 (2013), “Two Component Dark Matter : A Possible Explanation of 130 GeV γ Ray Line from the Galactic Centre”.
  39. Kamakshya Prasad Modak and Debasish Majumdar J. Phys. G 40, 075201 (2013), “Gamma Ray and Neutrino Flux from Annihilation of Neutralino Dark Matter at Galactic Halo Region in mAMSB Model”.
  40. Anirban Biswas, Debasish Majumdar, Pramana 80, 539 (2013), “The Real Gauge Singlet Scalar Extension of Standard Model: A Possible Candidate of Cold Dark Matter”.
  41. Debasish Majumdar, Abhijit Bandyopadhyay, Debabrata Adak, J. Phys. Conf. Ser. 375, 032008 (2012), “Reconstructing the equation of state and density parameter for dark energy from combined analysis of recent SNe Ia, OHD and BAO data”.
  42. Abhijit Bandyopadhyay, Debasish Majumdar, Astrophys. J. 746, 107 (2012), “On Diurnal and Annual Variations of Directional Detection Rates of Dark Matter”.
  43. Abhijit Bandyopadhyay, Sovan Chakraborty, Ambar Ghosal and Debasish Majumdar, JHEP 1011, 065 (2010), “Constraining Scalar Singlet Dark Matter with CDMS, XENON and DAMA and Prediction for Direct Detection Rates”.
  44. Abhijit Bandyopadhyay, Sovan Chakraborty and Debasish Majumdar, Int. J. Mod. Phys. A 25, 3741 (2010), “Interpreting the bounds on Dark Matter induced muons at Super-Kamiokande in the light of CDMS data”.
  45. Abhijit Samanta, Sudeb Bhattacharya, Ambar Ghosal, Kamales Kar, Debasish Majumdar and Amitava Raychaudhuri, Int. J. Mod. Phys. A 23, 233 (2008), “A GEANT-based study of atmospheric neutrino oscillation parameters at INO”.
  46. Debasish Majumdar, Pramana 70, 51 (2008), “Probing Pseudo-Dirac Neutrino through Detection of Neutrino Induced Muons from GRB Neutrinos”.
  47. Debasish Majumdar and Ambar Ghosal, Mod. Phys. Lett. A 23, 2011 (2008), “Dark Matter candidate in a Heavy Higgs Model – Direct Detection Rates”.
  48. Debasish Majumdar and Kamales Kar, Pramana 68, 423-433 (2007), “Beta decay rates of nuclei with 65 < A < 75 for pre-supernova and supernova evolution”.
  49. Debasish Majumdar and Ambar Ghosal, Phys. Rev. D 75, 113004 (2007), “Probing deviations from tri-bimaximal mixing through ultra high energy neutrino signals”.
  50. Ambar Ghosal and Debasish Majumdar, Mod. Phys. Lett. A 21, 1067 (2006), “’Bimaximal + democratic’ type neutrino mass matrix in view of quark-lepton complementarity”.
  51. Debasish Majumdar, Current Sc. 84, 1179 (2003), “A possible explanation for MACHOs: A candidate for dark matter – from quark-hadron phase transition”.
  52. Debasish Majumdar, Mod. Phys. Lett. A 18, 1705 (2003), “Relic densities for Kaluza-Klein dark matter”.
  53. Debasish Majumdar, Phys. Rev. D 67, 095010 (2003), “Detection rates for Kaluza-Klein dark matter”.
  54. Ambar Ghosal and Debasish Majumdar, Phys. Rev. D 66, 053004 (2002), “A Texture of neutrino mass matrix in view of recent neutrino experimental results”.
  55. Debasish Majumdar, J. Phys. G 28, 2747 (2002), “Mass and scalar cross-sections for neutralino dark matter in anomaly mediated supersymmetry breaking model”.
  56. Debasish Majumdar, Pramana 58, L135 (2002). “SNO results and neutrino magnetic moment solution to the solar neutrino problem”.
  57. Debasish Majumdar, Amitava Raychaudhuri and Arunansu Sil, Phys. Rev. D 63, 073014 (2001), “Solar neutrino results and violation of the equivalence principle: An Analysis of the existing data and predictions for SNO”.
  58. Srubabati Goswami, Debasish Majumdar and Amitava Raychaudhuri, Phys. Rev. D 63, 013003 (2001), “Solar neutrino rates, spectrum, and its moments: An MSW analysis in the light of Super-Kamiokande results”.
  59. D. Majumdar, Pramana 54, 185-201 (2000), “Variables for probing neutrino oscillation at Super-Kamiokande and the Sudbury Neutrino Observatory”.
  60. Sandhya Choube, Srubabati Goswami and Debasish Majumdar Phys. Lett. B 484, 73 (2000), “Status of the neutrino decay solution to the solar neutrino problem”.
  61. Debasish Majumdar and Amitava Raychaudhuri, Phys. Rev. D 60, 053001 (1999), “New variables for neutrino oscillation diagnostics at Super-Kamiokande and the Sudbury Neutrino Observatory”.
  62. Debasish Majumdar and Amitava Raychaudhuri, Pramana 52, L529-L536 (1999), “Solar neutrino oscillation diagnostics at Super-Kamiokande and SNO”.
  63. Debasish Majumdar, Kamales Kar, Alak Ray, Amitava Raychaudhuri and Firoza K. Sutaria, Int. J. Mod. Phys. A 15, 2105-2120 (2000), “Oscillation effects on neutrinos from the early phase of a nearby supernova”.
  64. Sandhya Choube, Debasish Majumdar and Kamales Kar, J. Phys. G 25, 1001-1008 (1999), “Effect of Flavor Oscillations on the detection of Supernova neutrinos”.
  65. V.K.B. Kota and D. Majumdar, R. Haq and R.J. Leclair, Can J. Phys. 77, 893-901 (2000), “Shell-model tests of the bimodal partial state densities in a 2 2 partitioned embedded random matrix ensemble”.
  66. Debasish Majumdar, Kamales Kar and A. Ansari, J. Phys. G 24, 2103 (1998), “ Giant dipole resonance in spectral averaging theory and analysis of experimental data for the nucleus”.
  67. Debasish Majumdar, Kamales Kar and A. Ansari, J. Phys. G 23, L41 (1997), “Giant Dipole Resonance in Spectral Averaging Theory”.
  68. V.K.B. Kota and D. Majumdar, Nucl. Phys. A 604, 129 (1996), ”Application of spectral averaging theory in large shell model spaces: Analysis of level density data of fp-shell nuclei”.
  69. D. Majumdar, B.K. Agrawal and S.K. Kataria, Nucl. Phys. A 597, 212-230 (1996), “On angular momentum and parity dependence of nuclear level densities in a simple random sampling approach”.
  70. V.K.B. Kota and D. Majumdar, Z. Phys. A 351, 377-383 (1995), “Bivariate distributions in statistical spectroscopy studies: IV. Interacting particle Gamow-Teller strength densities and -decay rates of fp-shell nuclei for presupernova stars”.
  71. V.K.B. Kota and D. Majumdar, Z. Phys. A 351, 365-376 (1995), “Bivariate distributions in statistical spectroscopy studies: III. Non interacting particle strength densities for one-body transition operators”.

Papers under review

  • “Neutrino oscillation measurements with JUNO in the presence of scalar NSI”, Aman Gupta, Debasish Majumdar and S. Prakash.
  • “Addressing the self-interaction for ELDER dark matter from the 21-cm signal”, R. Basu, Debasish Majumdar, A. Halder and S. Bannerjee.

Published in Conference proceedings

  • Upala Mukhopadhyay, Debasish Majumdar, Debabrata Adak, Springer Proc. Phys. 261 (2021) 919-923, Dark Energy Perturbation and Power Spectrum in Slotheon Model.
  • Avik Paul, Debasish Majumdar, Springer Proc. Phys. 261 (2021) 307313, Constraining Axion Mass from Cooling of Neutron Star.
  • Debasish Majumdar, Avik Paul, Biswajit Banerjee, Springer Proc. Phys. 248, 183- 191 (2020), Signatures of GW from an Extended Inert Doublet Model DOI: 10.1007/978-981-15-6292-1 22
  • Madhurima Pandey, Debasish Majumdar, Ashadul Halder, Shibaji Banerjee, Springer Proc. Phys. 248, 311-316 (2020). Mass and Life Time of Heavy Dark Matter Decay into IceCube PeV Neutrinos DOI:10.1007/978-981-15-6292-1 38.
  • Debasish Majumdar, Upala Mukhopadhyay, PoS EPS-HEP2019 (2020) 063 “Perturbations for Slotheon Field Dark Energy and its Evolution”.
  • K.K. Meghna et al (DINO collaboration), DAE Symp. Nucl. Phys.61, 934 (2016). Simulation of neutron background for DINO Dark Matter search experiment.
  • Debasish Majumdar, DAE Symp. Nucl. Phys. 60, 49 (2015). Dark Matter direct detection.
  • Debasish Majumdar, Abhijit Bandyopadhyay, Debabrata Adak, J. Phys. Conf. Ser. 375 (2012) 032008, Contribution to: TAUP 2011 “Reconstructing the equation of state and density parameter for dark energy from combined analysis of recent SNe Ia, OHD and BAO data”.

Selected visits and Invited talks

  1. The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy, during May – Aug. 2001 and Aug. 2004.
  2. Department of Physics, University of Oxford, October 2002, (invited talk on Dark Matter), April 2008 (invited talk on Neutrino Physics).
  3. Theory Division, CERN in Feb. 2002 and June 2008 as academic visitor.
  4. Dark Side of the Universe, May, 2008 at Cairo, Egypt.
  5. MultiDark Joint Focus Programme at Centre for Theoretical Physics of the Universe, Daejeon, South Korea, October 2014.
  6. Dark Side of the Universe, Nov. 2014, University of Cape Town, Cape Town, South Africa
  7. Physical Research Laboratory, Ahmedabad, India on Scalar Singlet Dark Matter as TPSC speaker, July, 2012.
  8. April 20 – April 21, 2013, “National conference on Double Beta Decay and Neutrinos (DBD2013)” held at Indian Institute of Technology, Ropar and Panjab University, Chandigarh. (Delivered an invited lecture).
  9. June 14 – June 17, 2013, 2nd International Conference on “Advances in AstroParticle Physics and Cosmology (AAPCOS)” held at Institute of Advanced Studies, Shimla, India (Delivered a lecture).
  10. March 13 – March 15, 2014 “Current Trends in Particle Physics Research”, at Department of Physics, University of Kalyani, Kalyani, India. An invited talk on Neutrino Physics.
  11. Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi, India on Two Component Dark Matter, an explanation of 130 GeV gamma line from galactic Centre April, 2013 (invited talk).
  12. Department of Physics, Panjab University, Chandigarh on Dark Matter: evidence and detection in May 2013 (invited talk).
  13. Department of Physics, Kashmir University, Srinagar, on Dark Matter in May 2013.
  14. Dark Side of the Universe, Nov. 2014, University of Cape Town, Cape Town, South Africa
  15. EPS-HEP Conference 2019, July 10-17,2019, Ghent, Belgium
  16. Physical Research Laboratory, Ahmedabad, India on Scalar Singlet Dark Matter as TPSC speaker, July, 2012.
  17. April 20 – April 21, 2013,
  18. Dark Matter at Indian Institute of Technology, Indore, India in April, 2014.
  19. ”Invisible matters: Neutrino and dark matter” at Indian Institute of Technology, Hyderabad, India in October, 2014.
  20. Invited talk at PHENO1@IISERM, April 06 – 09, 2016, IISER, Mohali.
  21. Invited talk at the Indo-US workshop ”Invisible Sector: Neutrinos and Dark matter” at University of Hyderabad, Hyderabad (Nov. 16 – 18, 2016).
  22. Invited mini-review talk on Dark Matter at XXII DAE-BRNS High Energy Physics Symposium at University of Delhi, Delhi, Dec. 12-16, 2016.
  23. Invited talk at “Workshop on High Energy Physics Phenomenology, WHEPP XV” at IISER, Bhopal during Dec. 14-17, 2017.
  24. Talk at “European Physical Society Conference on High Energy Physics” (EPS-HEP2019) at Ghent, Belgium during 10-17 July,2019.
  25. Invited talk on “Signatures of GW from an extended inert doublet model”, delivered at “Workshop on Frontiers in High Energy Physics” (FHEP 2019) at University of Hyderabad, Hyderabad, India during 14-17 October, 2019.
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