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      https://www.ias.ac.in/article/fulltext/joaa/039/04/0051

    • Keywords

       

      Equation of state; gravitational waves; pulsars: general; stars: neutron.

    • Abstract

       

      Radio pulsars show remarkable clock-like stability, which make them useful astronomy tools in experiments to test equation of state of neutron stars and detecting gravitational waves using pulsar timing techniques. A brief review of relevant astrophysical experiments is provided in this paper highlighting thecurrent state-of-the-art of these experiments. A program to monitor frequently glitching pulsars with Indian radio telescopes using high cadence observations is presented, with illustrations of glitches detected in this program, including the largest ever glitch in PSR B0531 $+$ 21. An Indian initiative to discover sub-$\mu$Hz gravitational waves, called Indian Pulsar Timing Array (InPTA), is also described briefly, where time-of-arrival uncertainties and post-fit residuals of the order of $\mu$s are already achievable, comparable to other international pulsar timing array experiments. While timing the glitches and their recoveries are likely to provide constraints on the structure of neutron stars, InPTA will provide upper limits on sub-$\mu$Hz gravitational waves apart from auxiliary pulsarscience. Future directions for these experiments are outlined.

    • Author Affiliations

       

      BHAL CHANDRA JOSHI1 PRAKASH ARUMUGASAMY1 MANJARI BAGCHI2 3 DEBADES BANDYOPADHYAY4 AVISHEK BASU1 NEELAM DHANDA BATRA5 6 SURYARAO BETHAPUDI7 ARPITA CHOUDHARY2 KISHALAY DE8 L. DEY9 A. GOPAKUMAR9 Y. GUPTA1 M. A. KRISHNAKUMAR1 10 YOGESH MAAN11 P. K. MANOHARAN1 10 ARUN NAIDU12 RANA NANDI13 DHRUV PATHAK2 3 MAYURESH SURNIS14 15 ABHIMANYU SUSOBHANAN9

      1. National Centre for Radio Astrophysics (Tata Institute of Fundamental Research), Post Bag No 3, Ganeshkhind, Pune 411 007, India.
      2. The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai 600 113, India.
      3. Homi Bhabha National Institute Training School Complex, Anushakti Nagar, Mumbai 400 094, India.
      4. Astroparticle Physics and Cosmology Division, Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhannagar, Kolkata 700 064, India.
      5. Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi 110 016, India.
      6. Department of Physics, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Shameerpet Mandal, Hyderabad 500 078, India.
      7. Department of Physics, Indian Institute of Technology Hyderabad, Kandi, Hyderabad 502 285, India.
      8. Cahill Centre for Astrophysics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.
      9. Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Dr. Homi Bhabha Road, Mumbai 400 005, India.
      10. Radio Astronomy Centre (NCRA-TIFR), Ooty, India.
      11. ASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands.
      12. Mcgill Space Institute, McGill University, Montreal, Canada.
      13. Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India.
      14. Department of Physics and Astronomy, West Virginia University, P. O. Box 6315, Morgantown, WV, USA.
      15. Center for Gravitational Waves and Cosmology, West Virginia University, Chestnut Ridge Research Building, Morgantown, WV, USA.
    • Dates

       
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