| 1. |
- Barack, Leor, et al.
(författare)
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Black holes, gravitational waves and fundamental physics : a roadmap
- 2019
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Ingår i: Classical and quantum gravity. - : IOP Publishing. - 0264-9381 .- 1361-6382. ; 36:14
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Forskningsöversikt (refereegranskat)abstract
- The grand challenges of contemporary fundamental physics dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem all involve gravity as a key component. And of all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some of the most remarkable predictions of General Relativity: event horizons, singularities and ergoregions. The hitherto invisible landscape of the gravitational Universe is being unveiled before our eyes: the historical direct detection of gravitational waves by the LIGO-Virgo collaboration marks the dawn of a new era of scientific exploration. Gravitational-wave astronomy will allow us to test models of black hole formation, growth and evolution, as well as models of gravitational-wave generation and propagation. It will provide evidence for event horizons and ergoregions, test the theory of General Relativity itself, and may reveal the existence of new fundamental fields. The synthesis of these results has the potential to radically reshape our understanding of the cosmos and of the laws of Nature. The purpose of this work is to present a concise, yet comprehensive overview of the state of the art in the relevant fields of research, summarize important open problems, and lay out a roadmap for future progress. This write-up is an initiative taken within the framework of the European Action on 'Black holes, Gravitational waves and Fundamental Physics'.
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| 2. |
- Ullio, Piero, 1972-
(författare)
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Indirect Detection of Neutralino Dark Matter
- 1999
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The detection of dark matter is a primary issue in today's astrophysics. Although the lightest supersymmetric particle, generally assumed to be a neutralino, is an excellent dark matter candidate, it is not easy to prove that such particles are the main component of galactic halos. The present analysis is focussed in particular on examining the prospects of detecting neutralino dark matter through its pair annihilation into monochromatic gamma rays and into cosmic antiprotons.There is no plausible astrophysical background for the gamma ray line signal from S-wave annihilations of massive relic particles into a two-body final state containing a photon. The possibility that such a signal might be detected by future high energy gamma ray experiments is examined in light of a full one loop calculation of neutralino annihilation into the 2-gamma and Z-gamma final states in the framework of the Minimal Supersymmetric extension to the Standard Model.The neutralino-induced cosmic ray antiproton flux has a less well-defined signature, nevertheless it can be at the level of the background from ordinary cosmic ray interactions. The way the signal from neutralino annihilation arises is critically reexamined. We find cases (in a clumpy halo scenario) in which its contribution in the high energy part of the antiproton spectrum can be singled out unambiguously.The complementarity among different dark matter detection techniques is discussed. This property is particularly interesting when we investigate the possibility that an excess in the continuum gamma ray background recently found in EGRET data can be interpreted in terms of neutralino annihilations.
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