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9,235 results on '"Chakraborty, S."'

4. Prospects of phase-adaptive cooling of levitated magnetic particles in a hollow-core photonic-crystal fibre

Author

Kumar, P., Jimenez, F. G., Chakraborty, S., Wong, G. K. L., Joly, N. Y., and Genes, C.

Subjects
Physics - Optics, Quantum Physics
Abstract

We analyze the feasibility of cooling of classical motion of a micro- to nano-sized magnetic particle, levitated inside a hollow-core photonic crystal fiber. The cooling action is implemented by means of controlling the phase of one of the counter-propagating fiber guided waves. Direct imaging of the particle's position, followed by the subsequent updating of the control laser's phase leads to Stokes type of cooling force. We provide estimates of cooling efficiency and final achievable temperature, taking into account thermal and detection noise sources. Our results bring forward an important step towards using trapped micro-magnets in sensing, testing the fundamental physics and preparing the quantum states of magnetization.

Published
2024

5. Follow-up of Neutron Star Mergers with CTA and Prospects for Joint Detection with Gravitational-Wave Detectors

Author

Mondal, T., Chakraborty, S., Resmi, L., and Bose, D.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The joint gravitational wave (GW) and electromagnetic observations of the binary neutron star (BNS) merger GW170817 marked a giant leap in multi-messenger astrophysics. The extensive observation campaign of the associated Gamma-Ray Burst (GRB) and its afterglow has strengthened the hypothesis associating GRBs with BNS mergers and provided insights on mass ejection, particularly the relativistic outflow launched in BNS mergers. In this paper, we investigate the joint detection probabilities of BNS mergers by GW detectors and the upcoming ground-based very-high-energy (VHE) $\gamma$-ray instrument, the Cherenkov Telescope Array (CTA). Using an empirical relation that constrains the distance-inclination angle plane, we simulated BNS mergers detectable in the O5 run of the LIGO/Virgo/Kagra (LVK) network with $300$~Mpc BNS horizon. Assuming Gaussian structured jets and ignoring large sky localization challenges of GW detectors, we estimated VHE afterglow detection probability by CTA. We have explored the afterglow parameter space to identify conditions favourable for detecting synchrotron self-Compton emission by CTA. Our study reveals that events viewed at angles $\lesssim3$ times the jet core angle are detectable by CTA when the initial bulk Lorentz factor at the jet axis ranges between 100 and 800. We find high kinetic energy ($E_k>10^{50}$ erg), ambient density ($n_0>10^{-1}$ $cm^{-3}$), and energy content in non-thermal electrons significantly enhance the likelihood of CTA detection within 300 Mpc. The joint detection rate varies significantly with afterglow parameter distributions, ranging from $0.003$ to $0.5$ per year., Comment: 16 pages, 8 figures

Published
2024

9. About the Translator

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

10. About the Editor

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

12. About the NYU Abu Dhabi Institute

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

13. Index

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

14. Further Reading

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

15. Bibliography

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

17. Notes

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

44. The Book of Charlatans

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

45. Notes to the Introduction

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

46. Note on the Text

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

49. Foreword

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

50. Acknowledgments

Author

Chakraborty, S. A., Davies, Humphrey, Dengler, Manuela, and al-Jawbarī, Jamāl al-Dīn ʿAbd al-Raḥīm

Published
2020

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