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Departments Integrated Teacher Education Programme Faculty

Dr. Alekha C. Nayak

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Dr. Alekha C. Nayak

Assistant Professor
alekhanayak@nitm.ac.in   
8009960899
Qualification : Ph.D : IIT Kanpur
Area of Research : Dark Matter, 21 cm Cosmology

Vidwan Profile    

Constraining dark matter properties using 21 cm global absorption signal, Dark matter inside neutron star and its implications

Sl No Institute Position held From To
1 NIT Meghalaya Assistant Professor 16-10-2019 till date
2 Physical Research Laboratory, Ahmedabad Post Doctoral Fellow 01-03-2018 30-09-2019

Visiting Associateship at Inter University Center for Astronomy and Astrophysics (IUCAA), (From August 2025 to August 2028)

Sl. No. Title PI Funding Agency Sanctioned amount From To Status
1

Illuminating dark matter using global 21-cm absorption signal during dark ages and cosmic dawn era.

 Dr. Alekha C. Nayak ISRO-DOS

Rs. 14,66,884

 

 Nov-2025 Nov-2027 Ongoing
2 Bound on sterile neutrino decay width and mixing angle with active neutrino using global 21-cm absorption signal.  Dr. Alekha C. Nayak SERB-DST Rs.11,27,522 Dec-2021 Dec-2023 Completed

3.           IUCAA Centre for Astronomy Research and Development (ICARD) : Coordinator: Dr. Alekha C. Nayak, Sponsored agency:     IUCAA, From April 2026 to March 2028                                              

Publication in Journal

  1. Dark ages bounds on non-accreting massive compact halo objects, Vivekanand Mohapatra and Alekha C. Nayak (Accepted in Phys. Rev. D )
  2. Constraining self-interacting ultrahigh-energy neutrinos by cosmic microwave background spectral distortion, Pravin K. Natwariya, Shibshankar Si, Alekha C. Nayak and Tripurari Srivastava   (Phys. Rev. D 113 (2026) 10, 10)
  3. Revisiting constraints on superconducting cosmic strings in light of Dark Ages global 21-cm signal, Shibshankar Si, Vivekanand Mohapatra, Pravin K. Natwariya and Alekha C. Nayak. (Phys. Rev. D 112 (2025) 8, 083540)
  4. The cosmic optical background intensity from decaying sterile neutrinos via magnetic dipole moment, Hriditi Howlader, Vivekanand Mohapatra, Alekha C. Nayak, Tripurari Srivastava. ( Phys. Rev. D 112 (2025) 4, 043027)
  5. In Search of Global 21-cm Signal using Artificial Neural Network in light of ARCADE 2, Vivekanand Mohapatra, Johhny J., Pravin K. Natwariya and Alekha C. Nayak.  (Eur.Phys.J.C 85 (2025) 5, 533)
  6. Constraining viscous dark matter in light of CMB spectral distortion. Shibshankar Si, Alekha C. Nayak and Pravin K. Natwariya. (Phys.Rev.D 111 (2025) 4, 043002)
  7. Primordial magnetic fields in light of dark ages global 21 cm signal. Vivekanand Mohapatra,  Pravin K. Natwariya and Alekha C. Nayak. (Phys. Rev. D 110 (2024), 123506)
  8. Dark matter admixed neutron star properties in the light of gravitational wave observations: a two fluid approach, Arpan Das, Tuhin Malik, and Alekha C. Nayak, Phys.Rev.D 105 (2022) 12, 123034
  9. Bounds on sterile neutrino lifetime and mixing angle with active neutrinos by global 21 cm signal, Pravin Kumar Natwariya and Alekha C. Nayak, Phys.Lett.B 827 (2022) 136955
  10. Constraining Spinning Primordial Black Holes With Global 21 cm Signal,  Pravin Kumar Natwariya, Alekha C. Nayak, and Tripurari Srivastava, Mon.Not.Roy.Astron.Soc. 510 (2021) 4236
  11. Very special relativity induced phase in neutrino oscillation, Alekha C. Nayak. Int.J.Mod.Phys.A 36 (2021) 13, 2150079
  12. Impact of ELKO fermion on Higgs mass, Alekha C. Nayak & Tripurari Srivastava, Eur.Phys.J.ST 229 (2020) 11, 2035-2041 (Invited)
  13. Prospects of charged lepton flavor violation in very special relativity,  Tripurari Srivastava & Alekha C. Nayak , Eur.Phys.J.Plus 135 (2020) 8, 679
  14. Baryon-Dark matter interaction in presence of magnetic fields in light of EDGES signal, Jitesh R. Bhatt, Pravin Kumar Natwariya  Alekha C.Nayak & Arun K. Pandey, Eur.Phys.J.C 80 (2020) 4, 334
  15. Viscous dark matter and 21 cm cosmology, Jitesh R. Bhatt, Arvind K. Mishra, and Alekha C. Nayak, Phys.Rev.D 100 (2019) 6, 063539
  16. Confronting nuclear equation of state in the presence of dark matter using GW170817 observation in relativistic mean-field theory approach,  Arpan Das, Tuhin Malik, and Alekha C. Nayak, Phys.Rev.D 99 (2019) 4, 043016
  17. Cosmological dark matter in a conformal model, Prasenjit Sanyal, Alekha C. Nayak, Gopal Kashyap and Pankaj Jain, Phys.Rev.D 100 (2019) 11, 115032
  18. Phenomenological implications of very special relativity, Alekha C. Nayak and Pankaj Jain, Phys.Rev.D 96 (2017) 7, 075020
  19. Vector dark matter annihilation with internal bremsstrahlung, Gulab Bambhaniya, Jason Kumar, Danny Marfatia, Alekha C. Nayak and Gaurav Tomar, Phys.Lett.B 766 (2017) 177-180
  20. Effect of VSR invariant Chern-Simon Lagrangian on photon polarization, Alekha C. Nayak,  Ravindra K. Verma and Pankaj Jain, JCAP 07 (2015) 031
  21. Elko and mass dimension one field of spin one half: causality and Fermi statistics, Dharam Vir Ahluwalia and Alekha C. Nayak, Int.J.Mod.Phys.D 23 (2015) 14, 1430026
  22. ELKO fermions as dark matter candidates, Bakul Agarwal, Pankaj Jain, Subhadip Mitra, Alekha C. Nayak, and Ravindra K. Verma, Phys.Rev.D 92 (2015) 075027

Preprint under review

 

1. Constraining Primordial Black Holes via p-wave annihilation in light of CMB Spectral Distortion and 21-cm global signal, Shibshankar Si, Pravin K. Natwariya, Alekha C. Nayak (e-Print:2601.00413 )

2. Infrared lines from sterile-neutrino transition magnetic moments at JWST, Hriditi Howlder, Alekha C. Nayak and Tripurari Srivastava (e-Print: 2608.17679)

 

Publication in International Conference

 

1. Pankaj Jain, Alekha Chandra Nayak, Pion/Kaon Decay in Very Special Relativity, PoS CKM2016 (2017) 034. 

2. A.C. Nayak and P.K. Natwariya, 21 cm Constraints on the Lifetime of the Sterile Neutrino and Mixing Angle with Active Neutrinos, Acta Physica Polonica B Proceedings Supplement, DOI: 10.5506/APhysPolBSupp.19.2-A13

Sl No. Name of the workshop Place Funding agency From To
1 TEQIP-III sponsored workshop on astro-particle physics and cosmology NIT Meghalaya TEQIP-III 12th March, 2021 16th March 2021
2 North Eastern Meet of Astronomers-XII NIT Meghalaya IUCAA, NIT, SCSTE Meghalya 29th June, 2026 1st July, 2026

PhD Supervision

Sl No. Name of the Student Date of Joining Research Area Status
1 Shibshankar Si

July 2021

 CMB spectral distortion Submitted
2 Vivekananda Mahapatra January 2022 21 cm cosmology Submitted
3

Hriditi Howlder

 July 2022 Dark matter Ongoing
4     

    Senorita Benedict

 July 2025    Not yet decided Ongoing
5 Vasudha July 2026 Not yet decided Ongoing

 

M.Sc thesis Supervision

 

  1. Constraint On Dark Matter Interaction Using The EDGES 21cm Signal During Cosmic Dawn Era (Vivekanand Mohapatra, Completed in June 2021)
  2. Studying The Effect of Dark Matter Inside Neutron Star using Gravitational Wave Observation (Simakhi Borchetia, Completed M.Sc Project in June 2021)
  3. Lepton Flavor Violating W Boson Decay in Very Special Relativity extension of Standard Model (Saikhom Bikash Singh, Completed M.Sc Project in June 2021)
  4. Freeze in production of ELKO fermion Dark matter (Nimish Gupta, Completed M.Sc Project in June 2022)
  5. Constraints on Scalar dark matter Using The EDGES 21cm Signal During Cosmic Dawn Era    (Yashu Bilotia, Completed M.Sc Project in June 2022)
  6. 21 cm cosmology and artificial neural network (Johnny J.,  Completed M.Sc Project in June 2023)
  7. Neutrino Oscillation in Very Special Relativity. (Sourin Choudhury, Completed in June 2023)
  8. Extraction of Global 21-cm signal parameters using ANN (Yadunandan M, Completed M.Sc Project in June 2024)
  9. Constraining Primordial Black Holes in light of CMB spectral distortion through s-wave and p-wave annihilation scenarios  (Sherya Ramolta, Completed M.Sc Project in June 2025).
  10. Bosonic dark matter admixed neutron star. (Anirban Das, Completed M.Sc Project in June 2025)

14. North East Meet on Astronomy 2025. Rajiv Gandhi University. (6 October- 8 October 2025)

13. Matter to the deepest 2025, University of Siselia in Katowice, Poland (15 September to 19 September 2025).

12. International Conference on Frontiers of High Energy Physics, IIT Bhilai, 13-15 February, 2025

11.Imprints of Dark matter on 21 cm line in Cosmic Dawn era, Cabibi@60, Central University, Karnataka, 16th March 2024.

10.Imprints of Dark matter on 21 cm line in Cosmic Dawn era, Invited talk at Govt. Women's College, Keonjhar, 2nd June 2024.

9. Anomalies 2021, IIT Hyderabad,  10-12 November 2021,

8. One-day National Symposium on High Energy Physics, 1st May, 2021.
7. Less Travelled Path of Dark Matter: Axions and Primordial Black Holes (ONLINE), ICTS Banglore, 09 November 2020 to 13 November 2020
6. KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2018), Japan. From 13th February 2018 to 16th February 2018.
5. Candles of Darkness, International Centre for Theoretical Sciences, Bengaluru, India. From 05th June 2017 to 09th June 2017

4. Sangam @ HRI 2016: Instructional Workshop in Particle Physics, Harish-Chandra Research Institute, Allahabad, India. From 15th to 19th February 2016.

3.Workshop on High Energy Physics Phenomenology, Indian Institute of Technology, Kanpur, India. From 4th to 13th December, 2015

2. Winter School on High Energy Physics, Banaras Hindu University, Varanasi, India. From 23rd January to 12th February 2013.

1.Summer internship programme for Indian students (SIPIS) 2010, National University of Singapore, Singapore, From 17th May to 15th July 2010.

1. CSAB, Cocordinator (17-01-2024 - till date)

2. Faculty in charge, Literary Club. (July 2022-till date)

3. Faculty in charge Astronomy Club. (January 2023-till date)

4. Warden, Umpling Boys Hostel (July 2021-December 2024), PhD 1 Seater (January 2025-April 2025), B.Tech 3 Seater (May 2025-till date)

5. Faculty Advisor:  2020 -22, 2023-2025 M.Sc Physics batch and currently M.Sc 1st year- 2025 batch

6. Member Examination cell (17-03-2025 to present)

7. Member Anti-ragging squad committee and Hostel patrolling committee (August 2025 to present)

8. Member on-campus business committee (06-05-2025 to present)

9. Member Ranking and accreditation committee (28-0302025 to present)

10. Member IQAC committee (September 2023 to present)


1. Nuclear and Particle Physics

2. Numerical Methods and Computational Physics

3. Electromagnetic Theory

4. Mathematical Physics-II

5. Physics (PH 101)

6. Computational Programming


Eur.Phys.J.C,  Journal of Physics G: Nuclear and Particle Physics, Modern Physics Letter A, International Journal of Modern Physics A, Proceedings of the Royal Society A, European Physical Journal ST,  Advances in Applied Clifford Algebras