Weekly online meeting on cosmology (WOMC)

Our cosmology group meets online at 10:00 AM on Saturdays. We typically request either a member of our group or an external member to give a talk at the meeting. The meeting is informal in character and the aim is to generate discussions. We are also hoping that the meetings will engender new ideas.

Listed below, in reverse chronological order, are the past and forthcoming talks.

Forthcoming talks

    To be decided

Past talks

  1. Date: March 23, 2024
    Title: Probing dark matter interactions with cosmological observables
    Speaker: Arnab Paul, Centre for Strings, Gravitation and Cosmology, Department of Physics, Indian Institute of Technology Madras, Chennai
  2. Date: February 24, 2024
    Title: Magnetic sky in an ab-normal universe
    Speaker: Arko Bhaumik, Physics and Applied Mathematics Unit, Indian Statistical Institute, Kolkata
  3. Date: January 20, 2024
    Title: Towards a possible solution to the Hubble tension with Horndeski gravity
    Speaker: Yashi Tiwari, Joint Astronomy Programme, Department of Physics, Indian Institute of Science, Bengaluru
  4. Date: December 2, 2023
    Title: PBH formation from non-canonical axion-curvaton scenario
    Speaker: Abhishek Naskar, ShanghaiTech University, Shanghai, China
  5. Date: November 25, 2023
    Title: Interpreting NANOGrav results and its implications on primordial cosmology
    Speaker: Mayukh Raj Gangopadhyay, The Thanu Padmanabhan Centre For Cosmology and Science Popularization, Shree Guru Gobind Singh Tricentenary University, Gurugram, Delhi-NCR
  6. Date: November 11, 2023
    Title: Investigating cosmological tensions in low and high redshift observational data
    Speaker: Ruchika Kaushal, Physics Department and INFN, Università di Roma “La Sapienza”, Rome, Italy
  7. Date: November 4, 2023
    Title: Decoherence and entropy generation at one loop in the inflationary de Sitter spacetime for Yukawa interaction
    Speaker: Sourav Bhattacharya, Relativity and Cosmology Research Centre, Department of Physics, Jadavpur University, Kolkata
  8. Date: October 7, 2023
    Title: Non-Gaussian imprints on cosmic microwave background
    Speaker: Barnali Das, Raman Research Institute, Bengaluru
  9. Date: September 23, 2023
    Title: Gravitational waves and dark energy in modified cosmological scenarios
    Speaker: Debika Chowdhury, Department of Physics, Swansea University, Swansea, UK
  10. Date: September 16, 2023
    Title: Post-reionization HI 21cm signal: A probe of negative cosmological constant
    Speaker: Chandrachud B. V. Dash, Birla Institute of Technology and Science, Pilani
  11. Date: September 9, 2023
    Title: Primordial black holes versus inflaton: Two chief systems of the world
    Speaker: Md. Riajul Haque, Centre for Strings, Gravitation, and Cosmology, Department of Physics, Indian Institute of Technology Madras, Chennai
  12. Date: September 2, 2023
    Title: Loop contributions to the scalar power spectrum due to quartic order action in ultra slow roll inflation
    Speaker: Suvashis Maity, Centre for Strings, Gravitation, and Cosmology, Department of Physics, Indian Institute of Technology Madras, Chennai
  13. Date: February 25, 2023
    Title: Primordial black holes and the tail of the primordial PDF
    Speaker: Swagat Saurav Mishra, Centre for Astronomy and Particle Theory, University of Nottingham, Nottingham, UK
  14. Date: February 4, 2023
    Title: Reconstructing cosmology using principal component analysis
    Speaker: Ranbir Sharma, Department of Physical Sciences, Indian Institute of Science Education and Research, Mohali
  15. Date: November 5, 2022
    Title: Do cosmological observations allow a negative Lambda?
    Speaker: Anjan Ananda Sen, Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi
  16. Date: October 29, 2022
    Title: Moduli dynamics at the end of inflation: A few phenomenological implications
    Speaker: Koushik Dutta, Department of Physical Sciences, Indian Institute of Science Education and Research, Kolkata
  17. Date: October 22, 2022
    Title: Cosmological analysis of Barrow holographic dark energy model in a nonflat universe
    Speaker: Sudipta Das, Department of Physics, Visva-Bharati, Santiniketan
  18. Date: September 24, 2022
    Title: E and B modes of the CMB y-type spectral distortions: Polarised kSZ effect
    Speaker: Aritra Gon, Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai
  19. Date: September 17, 2022
    Title: A primordial solution to tensions in cosmology
    Speaker: Akhil Antony, The Institute of Mathematical Sciences, Chennai
  20. Date: September 10, 2022
    Title: Towards 21-cm intensity mapping at z=2.28 with uGMRT using the tapered gridded estimator
    Speaker: Samir Choudhuri, Department of Physics, Indian Institute of Technology Madras, Chennai
  21. Date: September 3, 2022
    Title: Imprints of an early primordial black hole domination in the stochastic gravitational wave background
    Speaker: Nilanjandev Bhaumik, Department of Physics, Indian Institute of Science, Bengaluru
  22. Date: August 27, 2022
    Title: Quantum evolution of cosmological perturbations in single and two field inflationary models
    Speaker: Krishnamohan Parattu, Department of Physics, Indian Institute of Technology Madras, Chennai
  23. Date: August 20, 2022
    Title: The rise of the primordial tensor spectrum from an early scalar-tensor epoch
    Speaker: Debika Chowdhury, Department of Physics, Swansea University, Swansea, UK
  24. Date: April 9, 2022
    Title: Probing primordial features due to particle production during inflation in the CMB data
    Speaker: Suvedha Naik, Manipal Centre for Natural Sciences, Manipal Academy of Higher Education, Manipal
  25. Date: April 2, 2022
    Title: Constraining the cosmic curvature density parameter
    Speaker: Purba Mukherjee, Department of Physical Sciences, Indian Institute of Science Education and Research, Kolkata
  26. Date: March 26, 2022
    Title: Primordial correlation of gravitons with gauge fields
    Speaker: P. Jishnu Sai, Department of Physics, Indian Institute of Science, Bengaluru
  27. Date: March 5, 2022
    Title: Non-linear density-velocity evolution in f(R) theories using phase space dynamics
    Speaker: Sharvari Nadkarni-Ghosh, Department of Physics, Indian Institute of Technology, Kanpur
  28. Date: February 19, 2022
    Title: Gravitational wave probe of dark matter scenarios beyond the thermal WIMP paradigm
    Speaker: Debasish Borah, Department of Physics, Indian Institute of Technology, Guwahati
  29. Date: February 12, 2022
    Title: Potential reconstruction from general power spectrum in single field inflation
    Speaker: Rathul Nath Raveendran, Department of Physics, Sungkyunkwan university, Seoul, South Korea
  30. Date: December 18, 2021
    Title: Leptogenesis and dark matter in the presence of primordial black holes
    Speaker: Suruj Jyoti Das, Department of Physics, Indian Institute of Technology, Guwahati
  31. Date: December 11, 2021
    Title: On the challenges in the choice of the non-conformal coupling function in inflationary magnetogenesis
    Speaker: Sagarika Tripathy, Indian Institute of Technology Madras, Chennai
  32. Date: November 27, 2021
    Title: Effective theory of inflationary magnetogenesis and constraints on reheating
    Speaker: Sourav Pal, Department of Physics, Indian Institute of Technology, Guwahati
  33. Date: November 20, 2021
    Title: Non-minimally coupled scalar field as cold dark matter
    Speaker: Shiv Kumar Sethi, Raman Research Institute, Bengaluru
  34. Date: September 25, 2021
    Title: Accounting for scale dependent scalar non-Gaussianity in secondary gravitational waves
    Speaker: H. V. Ragavendra, Indian Institute of Technology Madras, Chennai
  35. Date: September 11, 2021
    Title: Probing the reheating phase of the universe
    Speaker: Debaprasad Maity, Department of Physics, Indian Institute of Technology, Guwahati
  36. Date: September 4, 2021
    Title: A fast estimator for quantifying the shape dependence of the bispectrum
    Speaker: Abinash Kumar Shaw, Department of Physics and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur
  37. Date: August 28, 2021
    Title: Primordial features: how relevant are they?
    Speaker: Dhiraj Hazra, The Institute of Mathematical Sciences, Chennai
  38. Date: August 21, 2021
    Title: Exotic image formation in gravitational lensing
    Speaker: Ashish Kumar Meena, Department of Physical Sciences, Indian Institute of Science Education and Research, Mohali
  39. Date: August 14, 2021
    Title: Constraining the abundance of primordial black holes using EDGES 21-cm signal
    Speaker: Shikhar Mittal, Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai
  40. Date: August 7, 2021
    Title: Inflationary degeneracies, reheating constraints and relic gravitational waves
    Speaker: Swagat Saurav Mishra, Inter-University Centre for Astronomy and Astrophysics, Pune
  41. Date: July 31, 2021
    Title: Axions and helical magnetic fields
    Speaker: Rajeev Kumar Jain, Department of Physics, Indian Institute of Science, Bengaluru
  42. Date: July 24, 2021
    Title: Perturbations in some dark energy models
    Speaker: Srijita Sinha, Department of Physical Sciences, Indian Institute of Science Education and Research, Kolkata
  43. Date: July 17, 2021
    Title: CMB anomalies from preinflationary physics in loop quantum cosmology
    Speaker: V. Sreenath, Department of Physics, National Institute of Technology Karnataka, Surathkal
  44. Date: July 10, 2021
    Title: Gaussian process reconstruction of reionization history
    Speaker: Aditi Krishak, Department of Physics, Indian Institute of Science Education and Research, Bhopal
  45. Date: July 3, 2021
    Title: Comparing perturbations in tachyon and quintessence dark energy models
    Speaker: Manvendra Pratap Rajvanshi, Department of Physical Sciences, Indian Institute of Science Education and Research, Mohali
  46. Date: June 26, 2021
    Title: Cosmic expansion parametrization: Implication for cosmic curvature and Hubble tension
    Speaker: Bikash R. Dinda, Department of Theoretical Physics, Tata Institute Of Fundamental Research, Mumbai
  47. Date: June 12, 2021
    Title: Sub-Chandrasekhar mass BH as a signature of particle DM
    Speaker: Anupam Ray, Department of Theoretical Physics, Tata Institute Of Fundamental Research, Mumbai
  48. Date: June 5, 2021
    Title: Magnetic fields and gravitational waves in a hot dense neutrino plasma and the NANOGrav signal
    Speaker: Arun Kumar Pandey, Department of Physics and Astrophysics, University of Delhi, New Delhi
  49. Date: May 22, 2021
    Title: New avenues: Weak lensing and model independent primordial power spectrum reconstruction
    Speaker: Rajorshi Sushovan Chandra, Inter-University Centre for Astronomy and Astrophysics, Pune
  50. Date: May 15, 2021
    Title: Aspects of non-Gaussianity in primordial tensor modes
    Speaker: Abhishek Naskar, Physics and Applied Mathematics Unit, Indian Statistical Institute, Kolkata
  51. Date: May 8, 2021
    Title: Ultra slow roll models of inflation with different reheating histories, to form primordial black holes and induced stochastic gravitational wave background
    Speaker: Nilanjandev Bhaumik, Department of Physics, Indian Institute of Science, Bengaluru
  52. Date: May 1, 2021
    Title: Bouncing cosmology in a curved braneworld
    Speaker: Tanmoy Paul, Department of Physics, Chandernagore College, Hooghly
  53. Date: April 24, 2021
    Title: Probing the reheating phase through primordial magnetic field and CMB
    Speaker: Md. Riajul Haque, Department of Physics, Indian Institute of Technology, Guwahati
  54. Date: April 17, 2021
    Title: Helical magnetic fields lead to baryogenesis
    Speaker: Ashu Kushwaha, Department of Physics, Indian Institute of Technology Bombay, Mumbai
  55. Date: April 10, 2021
    Title: Effects of nonstandard cosmologies on PBH and induced GW
    Speaker: Sukannya Bhattacharya, Department of Physics, Indian Institute of Technology Madras, Chennai
  56. Date: March 20, 2021
    Title: Reheating after inflation: Characteristics and constraints
    Speaker: Pankaj Saha, Department of Physics, Indian Institute of Technology Madras, Chennai
  57. Date: March 13, 2021
    Title: Search for the stochastic gravitational-wave background induced by primordial curvature perturbations in LIGO's second observing run
    Speaker: Shasvath Kapadia, International Centre for Theoretical Sciences, Bengaluru
  58. Date: March 6, 2021
    Title: Gravitational-wave generation in a viable scenario of inflationary magnetogenesis
    Speaker: Ramkishor Sharma, Inter-University Centre for Astronomy and Astrophysics, Pune
  59. Date: February 20, 2021
    Title: Reconstruction of potentials of hybrid inflation in the light of primordial black hole formation
    Speaker: Rathul Nath Raveendran, Department of Physics, Sungkyunkwan university, Seoul, South Korea