Minimal Magnetogenesis: Understanding the Role of Inflationary Perturbations and Alps

Strategic Insights -

Researchers from the Indian Institute for Technology have proposed a new scenario for the generation of large-scale magnetic fields in the universe, challenging the existing paradigm of inflationary magnetogenesis. According to the study, a strong magnetic field could be present in the universe, with a strength of up to 10^-10 gauss at the megaparsec scale, consistent with observational evidence. The research, published in the journal Physical Review D, suggests that the primordial fields are inherently weak, suppressed by the small amplitude of scalar fluctuations.

Key Takeaways:

  • The study proposes a minimal scenario for large-scale magnetic field generation from inflationary perturbations without nonconformal coupling.
  • The primordial fields are weak due to their origin in the inflationary scalar spectrum, with their strength suppressed by the small amplitude of scalar fluctuations.
  • The research suggests that a strong magnetic field could be present in the universe, with a strength of up to 10^-10 gauss at the megaparsec scale, consistent with observational evidence.
  • The study considers the coupling between the large-scale weak primordial magnetic field and a light axion, and its implications for gravitational wave signatures.
  • The research has been peer-reviewed and published in Physical Review D.
  • The study's authors include Subhasis Maiti, Debaprasad Maity, and Rohan Srikanth from the Indian Institute for Technology.
  • The research is supported by the Council of Scientific and Industrial Research, Ministry of Science and Technology, Government of India, Science and Engineering Research Board, and Department of Science and Technology.

Statistics:

  • A strong magnetic field could be present in the universe, with a strength of up to 10^-10 gauss at the megaparsec scale.
  • The primordial fields are inherently weak, suppressed by the small amplitude of scalar fluctuations.
  • The study considers the coupling between the large-scale weak primordial magnetic field and a light axion.
  • The research has been peer-reviewed and published in Physical Review D, a leading journal in the field of physics.
  • The study's authors have conducted research at the Indian Institute for Technology, one of the top research institutions in India.

Sources:

  • NewsRx. Findings from Indian Institute for Technology Broaden Understanding of Physics (Minimal Magnetogenesis: the Role of Inflationary Perturbations and Alps, and Their Gravitational Wave Signatures). Journal of Physics Research. November 4, 2025; p 372.
  • Physical Review D. "Minimal Magnetogenesis: the Role of Inflationary Perturbations and Alps, and Their Gravitational Wave Signatures." American Physical Society, 2025; 112(4).
  • Indian Institute for Technology. Department of Physics, Gauhati 781039, Assam, India.