Study of Microstructure and Texture of Heavily Cold Worked TiTaNb Alloy and the Effect of Annealing

Dasgupta, Arup; Laha, K.; Kayalvizhi, R; Jeyaganesh, B.; Raju, S.; Murugesan, S.; Saibaba, Saroja; Sarma, S. Sudhakara; Vijayalakshmi, M.

doi:10.1557/proc-1137-ee05-29

Cited by 9 publications

(10 citation statements)

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“…Figure 3 shows a comparison of these present bounds on the dark matter self-annihilation cross section as function of the WIMP mass for neutrinos and gamma-rays. Neutrinos are in particular competitive for m χ > 1 TeV, with best sensitivity achieved by clusters of galaxies if substructure is taken into account [40]. WIMPs could accumulate in the Sun or Earth and give rise to detectable neutrino signals.…”

Section: Neutrinosmentioning

confidence: 99%

Review of Indirect WIMP Search Experiments

Rott

2013

Nuclear Physics B - Proceedings Supplements

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Observational evidence for dark matter can be explained by Weakly Interacting Massive Particles (WIMPs). These dark matter particle candidates could indirectly be detected through the observation of signals produced as part of WIMP annihilations or decays. Latest results from indirect searches for WIMPs are reviewed. Current and planned experiments are presented and their prospects and discovery potential discussed.

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Section: Neutrinosmentioning

confidence: 99%

Review of Indirect WIMP Search Experiments

Rott

2013

Nuclear Physics B - Proceedings Supplements

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“…Various astrophysical constraints for 𝑀 10 −16 𝑀 exist, based on Hawking evaporation of PBHs. This includes constraints from extragalactic 𝛾ray flux (Carr et al 2010;Arbey et al 2020;Ballesteros et al 2020), Galactic 𝛾-ray flux (Carr et al 2016;DeRocco & Graham 2019;Laha 2019;Dasgupta et al 2019;Laha et al 2020b;Chan & Lee 2020), cosmic microwave background (Clark et al 2017;Stöcker et al 2018;Poulter et al 2019;Acharya & Khatri 2020a,b), cosmic rays (Boudaud & Cirelli 2019), and the 21cm absorption (Clark et al 2018).…”

Section: Introductionmentioning

confidence: 99%

A constraint on light primordial black holes from the interstellar medium temperature

Kim

2021

Monthly Notices of the Royal Astronomical Society

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Primordial black holes are a viable dark matter candidate. They decay via Hawking evaporation. Energetic particles from the Hawking radiation interact with interstellar gas, depositing their energy as heat and ionization. For a sufficiently high Hawking temperature, fast electrons produced by black holes deposit a substantial fraction of energy as heat through the Coulomb interaction. Using the dwarf galaxy Leo T, we place an upper bound on the fraction of primordial black hole dark matter. For M < 5 × 10−17M⊙, our bound is competitive with or stronger than other bounds.

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“…If there are many (> 1) of these black holes within a Silk region, the resulting µ-distortion is the sum of their contributions. In our model, the number density of supercritical black 5 Here we assume d t, i.e., the cosmic expansion can be neglected when the shell passes through the point. Later we will see the case when this is not satisfied.…”

Section: Spectral Distortions From Domain Wall Bubblesmentioning

confidence: 99%

“…Some recent works[2][3][4][5] show that constraints from Galactic positrons could put slightly more stringent bounds near M ∼ 10 15 g than the extragalactic γ-ray background.…”

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confidence: 99%

Spiky CMB distortions from primordial bubbles

Deng

2020

Preprint

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Primordial bubbles that possibly nucleate through quantum tunneling during inflation in a multidimensional potential might have left some relic detectable at the present time. These bubbles turn into black holes during the radiation era, which may account for the LIGO black holes, supermassive black holes, and may play an important role in dark matter. Typically, these black holes are surrounded by an energy deficit in the form of a spherical sound wave packet propagating outwards. In this work we study how this perturbation of the cosmic plasma dissipates before the time of recombination, leading to spectral distortions in CMB. We find that there may exist some rare regions on the last scattering surface containing huge black holes, which have produced potentially detectable point-like signals of µ-type distortions.

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Study of Microstructure and Texture of Heavily Cold Worked TiTaNb Alloy and the Effect of Annealing

Cited by 9 publications

References 0 publications

Review of Indirect WIMP Search Experiments

Review of Indirect WIMP Search Experiments

A constraint on light primordial black holes from the interstellar medium temperature

Spiky CMB distortions from primordial bubbles

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