Dual MeV gamma-ray and dark matter observatory - GRAMS Project

Aramaki, T.; Adrian, Per Ola Hansson; Karagiorgi, G.; Odaka, Hirokazu

doi:10.1016/j.astropartphys.2019.07.002

Cited by 85 publications

(66 citation statements)

References 51 publications

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“…DM and PBH Searches via MeV Gamma Rays with GRAMS Figure 1: Detection concept for MeV gamma rays and charged particles gamma rays. For the detection of gamma rays, the LArTPC at the heart of the GRAMS detector is used as a Compton camera and as a particle tracking calorimeter [9]. Such a detector has the potential to probe many cosmic mysteries that surround objects like pulsars, blazars, black holes, neutron star mergers, etc.…”

Section: Pos(icrc2021)552mentioning

confidence: 99%

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Exploring MeV gamma rays from dark matter annihilation and evaporating primordial black holes in the GRAMS experiment

Leyva¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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The upcoming GRAMS (Gamma-Ray and AntiMatter Survey) experiment aims to provide unprecedented sensitivity to a poorly explored region of the cosmic gamma-ray spectrum from 0.1-100 MeV, often referred to as the "MeV gap". Utilizing Liquid Argon Time Projection Chamber (LArTPC) technology to detect these MeV gamma rays, GRAMS has the potential to uncover crucial details behind a variety of processes in multi-messenger astrophysics. Various theories on particle interactions beyond the standard model predict that dark matter annihilations may contribute to the cosmic gamma spectrum via monochromatic gamma emissions (spectral lines), the annihilation of decay products, and the radiation of electromagnetically charged final states (FSR). MeV gamma rays may also be emitted from primordial black holes (PBHs) that are currently gaining interest as candidates for dark matter. By looking for the Hawking radiation from such objects, GRAMS can likely probe for ultra-light PBHs, which theoretically may comprise the majority of dark matter seen in the Universe. Here, we will describe how the analyses of the targeted gamma-ray regime will enable GRAMS to uniquely and complementarily place constraints on low-mass dark matter models.

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Section: Pos(icrc2021)552mentioning

confidence: 99%

“…3 alongside comparable missions like e-ASTROGAM [14] and AMEGO [15] . Close to 10 MeV, a cusp can be seen marking the transition between the Compton scattering and pair production regimes [9].…”

Section: Sensitivity To Dm Annihilationmentioning

confidence: 99%

Exploring MeV gamma rays from dark matter annihilation and evaporating primordial black holes in the GRAMS experiment

Leyva¹

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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“…This feature is commonly seen in photon spectra from well-developed electromagnetic cascades 23 . The cascade gamma-ray spectra are well below the upper limit from the Fermi Large Area Telescope (LAT) 40 and the design sensitivity of future MeV satellites [41][42][43][44] .…”

Section: Resultsmentioning

confidence: 99%

“…Future MeV satellites, such as e-ASTROGAM 41 , the All-sky Medium Energy Gamma-ray Observatory (AMEGO) 48 , and Gamma-Ray and AntiMatter Survey (GRAMS) 43 , will be able to measure the electron temperature in RIAFs by detecting a clear cutoff feature (see Fig. 2), which will shed light on the electron heating mechanisms in the collisionless plasma.…”

Section: Resultsmentioning

confidence: 99%

Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos

2021

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The Universe is filled with a diffuse background of MeV gamma-rays and PeV neutrinos, whose origins are unknown. Here, we propose a scenario that can account for both backgrounds simultaneously. Low-luminosity active galactic nuclei have hot accretion flows where thermal electrons naturally emit soft gamma rays via Comptonization of their synchrotron photons. Protons there can be accelerated via turbulence or reconnection, producing high-energy neutrinos via hadronic interactions. We demonstrate that our model can reproduce the gamma-ray and neutrino data. Combined with a contribution by hot coronae in luminous active galactic nuclei, these accretion flows can explain the keV – MeV photon and TeV – PeV neutrino backgrounds. This scenario can account for the MeV background without non-thermal electrons, suggesting a higher transition energy from the thermal to nonthermal Universe than expected. Our model is consistent with X-ray data of nearby objects, and testable by future MeV gamma-ray and high-energy neutrino detectors.

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“…We can expect further enhanced sensitivity for the GRAMS satellite mission, comparable to future proposed missions such as e-ASTROGAM and AMEGO [17]. GRAMS will also have further improved sensitivities to gamma-ray lines from positron annihilation and radioactive isotopes, as well as potential gamma-ray lines from Galactic neutron star merger remnants [18,19].…”

Section: Pos(icrc2021)653mentioning

confidence: 92%

Overview of the GRAMS (Gamma-Ray AntiMatter Survey) Project

Aramaki¹,

Aoyama²,

Asaadi³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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Gamma-Ray and AntiMatter Survey) is a next-generation proposed balloon/satellite mission that will be the first to target both MeV gamma-ray observations and antimatter-based indirect dark matter searches with a LArTPC (Liquid Argon Time Projection Chamber) detector. Astrophysical observations at MeV energies have been poorly explored and long-neglected. With a cost-effective, large-scale LArTPC, a single LDB (Long-Duration Balloon) flight could provide an order of magnitude improved sensitivity compared to previous experiments. We can uniquely measure gamma rays from annihilating dark matter and evaporating primordial black holes. Additionally, GRAMS can extensively explore dark matter parameter space via antimatter measurements. In particular, low-energy antideuterons can be background-free dark matter signatures. We could deeply investigate the parameter space and validate the potential dark matter signatures suggested by the Fermi gamma-ray observations and AMS-02 antiparticle measurements.

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Dual MeV gamma-ray and dark matter observatory - GRAMS Project

Cited by 85 publications

References 51 publications

Exploring MeV gamma rays from dark matter annihilation and evaporating primordial black holes in the GRAMS experiment

Exploring MeV gamma rays from dark matter annihilation and evaporating primordial black holes in the GRAMS experiment

Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos

Overview of the GRAMS (Gamma-Ray AntiMatter Survey) Project

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