Multimessenger Multi-TeV Dark Matter

Gammaldi, Viviana

doi:10.3389/fspas.2019.00019

Cited by 15 publications

(16 citation statements)

References 118 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, interestingly, this unID slightly prefers a fit to a "Cutoff Power Law" instead of a "Simple Power Law" [35], which is a parametric form that better reproduces a typical DM annihilation spectrum [22,23]. Heavy WIMPs are well motivated [55][56][57] and, probably, favoured in the light of current DM constraints in the usual σv (velocity-averaged annihilation cross section) vs. m χ (WIMP mass) parameter space: IACTs are still far from being able to probe the thermal relic cross section values [58] for large, TeV WIMP masses, while for much lighter, O(GeV) masses there are already robust and strong constraints, e.g., [23,59].…”

Section: Hwc J1040+308 As a Dm Subhalo Candidatementioning

confidence: 99%

Constraints to Dark Matter Annihilation from High-Latitude HAWC Unidentified Sources

Coronado-Blázquez

2019

Galaxies

View full text Add to dashboard Cite

The ΛCDM cosmological framework predicts the existence of thousands of subhalos in our own Galaxy not massive enough to retain baryons and become visible. Yet, some of them may outshine in gamma rays provided that the dark matter is made of weakly interacting massive particles (WIMPs), that would self-annihilate and would appear as unidentified gamma-ray sources (unIDs) in gamma-ray catalogs. Indeed, unIDs have proven to be competitive targets for dark matter searches with gamma rays. In this work, we focus on the three high-latitude (|b| ≥ 10 o ) sources present in the 2HWC catalog of the High Altitude Water Cherenkov (HAWC) observatory with no clear associations at other wavelenghts. Indeed, only one of these sources, 2HWC J1040+308, is found to be above the HAWC detection threshold when considering 760 days of data, i.e., a factor 1.5 more exposure time than in the original 2HWC catalog. Other gamma-ray instruments such as Fermi-LAT or VERITAS at lower energies do not detect the source. Also, this unID is reported as spatially extended, making it even more interesting in a dark matter search context. While waiting for more data that may shed further light on the nature of this source, we set competitive upper limits on the annihilation cross section by comparing this HAWC unID to expectations based on state-of-the-art N-body cosmological simulations of the Galactic subhalo population. We find these constraints to be particularly competitive for heavy WIMPs, i.e., masses above ∼ 25 (40) TeV in the case of the bb (τ + τ − ) annihilation channel, reaching velocity-averaged cross section values of 2 · 10 −25 (5 · 10 −25 ) cm 3 s −1 . Although far from testing the thermal relic cross section value, the obtained limits are independent and nicely complementary to those from radically different DM analyses and targets, demonstrating once again the high potential of this DM search approach.

show abstract

Section: Hwc J1040+308 As a Dm Subhalo Candidatementioning

confidence: 99%

Constraints to Dark Matter Annihilation from High-Latitude HAWC Unidentified Sources

Coronado-Blázquez

2019

Galaxies

View full text Add to dashboard Cite

show abstract

“…The most populated classes are those of active galactic nuclei (AGNs), supernova remnants (SNRs) and pulsar wind nebulae (PWNe). When it comes to dark matter (DM) searches, IACT observations have been used to place competitive limits on TeV-scale DM candidates, although unable to probe the theoretically motivated annihilation thermal relic cross section value [39,50,46,7,1].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of the Cherenkov Telescope Array to dark subhalos

Coronado-Blázquez,

Doro,

Sánchez-Conde

et al. 2021

Preprint

View full text Add to dashboard Cite

In this work, we study the potential of the Cherenkov Telescope Array (CTA) for the detection of Galactic dark matter (DM) subhalos. We focus on low-mass subhalos that do not host any baryonic content and therefore lack any multiwavelength counterpart. If the DM is made of weakly interacting massive particles (WIMPs), these dark subhalos may thus appear in the gamma-ray sky as unidentified sources. A detailed characterization of the instrumental response of CTA to dark subhalos is performed, for which we use the ctools analysis software and simulate CTA observations under different array configurations and pointing strategies, such as the scheduled extragalactic survey. This, together with information on the subhalo population as inferred from N-body cosmological simulations, allows us to predict the CTA detectability of dark subhalos, i.e., the expected number of subhalos in each of the considered observational scenarios. In the absence of detection, for each observation strategy we set competitive limits to the annihilation cross section as a function of the DM particle mass, that are at the level of σv ∼ 4 × 10 −24 (7 × 10 −25 ) cm 3 s −1 for the b b (τ + τ − ) annihilation channel in the best case scenario. Interestingly, we find the latter to be reached with no dedicated observations, as we obtain the best limits by just accumulating exposure time from all scheduled CTA programs and pointings over the first 10 years of operation. This way CTA will offer the most constraining limits from subhalo searches in the intermediate range between ∼ 1 − 3 TeV, complementing previous results with Fermi-LAT and HAWC at lower and higher energies, respectively.

show abstract

“…In the past, a thermal branon with mass of ∼ 50 TeV was proposed to explain the cut-off at TeV scale observed by the H.E.S.S. telescope at the Galactic center [4].…”

Section: Introductionmentioning

confidence: 99%

Cherenkov Telescope Array sensitivity to branon dark matter models

Aguirre-Santaella¹,

Gammaldi²,

Nieto³

2021

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

View full text Add to dashboard Cite

TeV DM candidates are gradually earning more and more attention within the community. Among others, extra-dimensional brane-world models may produce thermal DM candidates with masses up to 100 TeV, which could be detected with the next generation of very-high-energy gamma-ray observatories such as the Cherenkov Telescope Array (CTA). In this work, we study the sensitivity of CTA to branon DM via the observation of dwarf spheroidal galaxies. We computed annihilation cross section values needed to reach a 5 detection as a function of the branon mass. Additionally, in the absence of a predicted DM signal, we obtained 2 upper limits on the annihilation cross section. These limits lie 1.5 − 2 orders of magnitude above the thermal relic cross section value. Yet, CTA will allow to exclude a significant portion of the brane tension-mass parameter space in the 0.1 − 60 TeV branon mass range, and up to tensions of ∼ 10 TeV. More importantly, CTA will significantly enlarge the region already excluded by AMS and CMS, and will provide valuable complementary information to future SKA radio observations.

show abstract

Multimessenger Multi-TeV Dark Matter

Cited by 15 publications

References 118 publications

Constraints to Dark Matter Annihilation from High-Latitude HAWC Unidentified Sources

Constraints to Dark Matter Annihilation from High-Latitude HAWC Unidentified Sources

Sensitivity of the Cherenkov Telescope Array to dark subhalos

Cherenkov Telescope Array sensitivity to branon dark matter models

Contact Info

Product

Resources

About