Debasish Borah's scientific contributions

What is this page?

This page lists the scientific contributions of an author, who either does not have a ResearchGate profile, or has not yet added these contributions to their profile.

It was automatically created by ResearchGate to create a record of this author's body of work. We create such pages to advance our goal of creating and maintaining the most comprehensive scientific repository possible. In doing so, we process publicly available (personal) data relating to the author as a member of the scientific community.

If you're a ResearchGate member, you can follow this page to keep up with this author's work.

If you are this author, and you don't want us to display this page anymore, please let us know.

Publications (1)

FIG. 4. Constraints on DM lifetime/decay rate from both current and future experiments considering the DM decay via b ¯ b channel. The blue curve depicts the constraint from TA's UHECR data. The cyan and green dashed curves represent the constraints from UHE neutrino sensitivities of IceCubeGen2 and GRAND 200k, respectively. The magenta and red solid curves show the present constraints from UHE gammaray non-observation in TA and PAO, respectively, whereas, the red and purple dashed curves depict the projected reach of the upcoming telescopes PAO upgrade and GRAND 200k, respectively. While the constraints from current observations (blue, magenta, red solid curves) suggest τχ ≳ 10 30 s, future gamma-ray observations (red and purple dashed curves) will be able to probe τχ up to 10 32 s. The vertically shaded grey regions depict the excluded range of mχ for the TA Amaterasu event.
The Amaterasu particle: constraining the superheavy dark matter origin of UHECRs
  • Preprint
  • File available

June 2024

·

14 Reads

Prantik Sarmah

·

Nayan Das

·

Debasish Borah

·

[...]

·

Poonam Mehta

Amaterasu, the second most energetic ($244$ EeV) cosmic ray particle has been recently detected by the Telescope Array (TA) surface detector. The origin of the TA Amaterasu event is puzzling, as its arrival direction points back to a void in the local Universe, lacking conventional astrophysical ultra-high-energy (UHE) cosmic ray (CR) sources. Hence, we explore the possibility if this TA Amaterasu event could have originated from the decay of superheavy dark matter (SHDM) in the Milky Way. Such an origin also opens up multi-messenger detection channels in both UHE gamma-rays and UHE neutrinos. In this present work, using the TA Amaterasu event and the multi-messenger limits/sensitivities from various UHE telescopes, we place stringent constraints on the lifetime and mass of the SHDM. We find that the non-detection of the corresponding gamma-rays at the Pierre Auger Observatory (PAO) and the TA is in severe tension with the SHDM parameter space required to explain the TA Amaterasu event. Additionally, we extend the multi-messenger analysis to the future UHE gamma-ray and UHE neutrino telescopes such as PAO upgrade, GRAND 200k and IceCube-Gen2. We find that the bounds from the future neutrino telescopes will be able to compete with the present UHECR bounds. However, compared to the existing UHE gamma-ray bounds, the future PAO upgrade and the GRAND 200k gamma-ray detectors will improve the bounds on SHDM lifetime by at least one order of magnitude.

Download
Share