Particles and cosmology: Learning from cosmic rays

Ellis, John
June 2000
AIP Conference Proceedings;2000, Vol. 516 Issue 1, p21
Academic Journal
The density budget of the Universe is reviewed, and then specific particle candidates for non-bayonic dark matter are introduced, with emphasis on the relevance of cosmic-ray physics. The sizes of the neutrino masses indicated by recent atmospheric and solar neutrino experiments may be too small to contribute much hot dark matter. My favored candidate for the dominant cold dark matter is the lightest supersymmetric particle, which probably weighs between about 50 GeV and about 600 GeV. Strategies to search for it via cosmic rays due to annihilations in the halo, Sun and Earth, or via direct scattering experiments, are mentioned. Possible superheavy relic particles are also discussed, in particular metastable string- or M-theory cryptons, that may be responsible for the ultra-high-energy cosmic rays. Finally, it is speculated that a non-zero contribution to the cosmological vacuum energy might result from incomplete relaxation of the quantum-gravitational vacuum. © 2000 American Institute of Physics.


Related Articles

  • Space voids really are devoid of matter.  // Nature;8/8/1996, Vol. 382 Issue 6591, p481 

    Reports that a team of astronomers have discovered that the large empty regions in space, called holes or voids, are literally devoid of matter. Impact of discovery on theory of dark matter; Report and analysis due in September 1, 1996 `Astrophysical Journal Letters.'

  • In Quest of the Cosmos. Impey, Chris // World & I;Sep99, Vol. 14 Issue 9, p160 

    Focuses on cosmology. Modern theory of the universe; Shape of the space; Details on the dark matter; Illustration of the universe's models.

  • The Universe Is Unbiased. MacRobert, Alan // Sky & Telescope;Mar2002, Vol. 103 Issue 3, p21 

    Presents the results of a study on how closely the invisible dark matter of the universe matches the distribution of visible matter.

  • Superdense dark matter clumps from superheavy particles. Berezinsky, V.; Dokuchaev, V.; Eroshenko, Yu.; Kachelrieß, M.; Solberg, M. // Theoretical & Mathematical Physics;Jan2012, Vol. 170 Issue 1, p83 

    We describe some specific but reasonable conditions for the formation of superdense clumps (or minihalos) of dark matter. Such clumps can be produced by several mechanisms, most notably by spiky features in the spectrum of density perturbations. Being produced very early during the...

  • Dark Matter in Susy Models. Arnowitt, R.; Dutta, B.; Santoso, Y. // Physics of Atomic Nuclei;Dec2002, Vol. 65 Issue 12, p2218 

    Direct detection experiments for neutralino dark matter in the Milky Way are examined within the framework of SUGRA models with R-parity invariance and grand unification at the GUT scale, M[sub G]. Models of this type apply to a large number of phenomena, and all existing bounds on the SUSY...

  • The Lyman-α Forest as a Cosmological Tool. Weinberg, David H.; Davé, Romeel; Katz, Neal; Kollmeier, Juna A. // AIP Conference Proceedings;2003, Vol. 666 Issue 1, p157 

    We review recent developments in the theory of the Lyα forest and their implications for the role of the forest as a test of cosmological models. Simulations predict a relatively tight correlation between the local Lyα optical depth and the local gas or dark matter density. Statistical...

  • Detecting dark matter. Dixon, Roger L. // AIP Conference Proceedings;2000, Vol. 536 Issue 1, p253 

    Dark matter is one of the most pressing problems in modern cosmology and particle physic research. This talk will motivate the existence of dark matter by reviewing the main experimental evidence for its existence, the rotation curves of galaxies and the motions of galaxies about one another. It...

  • A New Beginning. Sincell, Mark // Popular Science;Feb2001, Vol. 258 Issue 2, p70 

    Discusses theories on the origin of the universe. How the universe was formed; Predictions on the theory of inflation; Weight of the universe; Details on dark energy and matter.

  • Tadpole galaxies are lightweights. Chown, Marcus // New Scientist;6/01/96, Vol. 150 Issue 2032, p17 

    Reports on research developments in cosmology. Dispute over the size and expansion of the universe; Inflationary universe; Dark matter distribution in the universe.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics