A recent observation of the two candidate events of the dark matter recoiling at CDMS-II is suggestive of dark matter with a mass not far above 100 GeV. We propose a model of gauge mediated supersymmetry breaking where the lightest neutralino is identified as dark ...
Energy Citations Database
The direct limit of electric dipole moment and direct searches for dark matter by electric dipole interaction are investigated with including the electromagnetic nuclear form factor, in case that the dark matter candidate is a Dirac particle. The electric dipole moment of dark ...
NASA Astrophysics Data System (ADS)
Methods for determining the percentage of dark matter in the Galaxy are described. The measuring of the speed of hydrogen gas in clouds using the Doppler effect is discussed. Consideration is given to the examination of the envelope of dark matter around the Galaxy from observations of high-velocity stars and the ...
matter particles in Sagittarius could be discovered. It is also possible that annihilating dark matter################## arXiv:astro�ph/0505414 v1 19 May 2005 TeV Dark Matter detection by Atmospheric, observed by the VERITAS, CANGAROO-II and HESS collaborations, may arise ...
E-print Network
Astrophysical observations indicate that dark matter constitutes most of the mass in our universe, but its nature remains unknown. Over the past decade, the Cryogenic Dark Matter Search (CDMS II) experiment has provided world-leading sensitivity for the direct detection of weakly interacting ...
PubMed
With the recent possible signal of dark matter from the CDMS II experiment, the Z{sup '} mass of a new version of the dark left-right gauge model (DLRM II) is predicted to be at around a TeV. As such, it has an excellent discovery prognosis at the operating Large Hadron Collider.
We present a hidden Abelian extension of the standard model including a complex scalar as a dark matter candidate and a light scalar acting as a long range force carrier between dark matter particles. The Sommerfeld enhanced annihilation cross section of the dark matter ...
If the dark matter in galaxies is composed of one flavor of neutrino, its distribution sets a lower limit to the neutrino mass. To use this constraint, the distribution of dark matter must be modeled. It is shown here that, when models are constructed, the neutrino mass must exceed 19 eV. The dwarf galaxy DDO 154 ...
Dark Matter annihilation holds great potential for directly probing the clumpiness of the Galactic halo that is one of the key predictions of the Cold Dark Matter paradigm of hierarchical structure formation. Here we review the gamma-ray signal arising from dark matter ...
Most analyses of dark matter within supersymmetry assume the entire cold dark matter arising only from weakly interacting neutralinos. We study a new class of models consisting of U(1){sup n} hidden sector extensions of the minimal supersymmetric standard model that includes several stable particles, both fermionic ...
Most analyses of dark matter within supersymmetry assume the entire cold dark matter arising only from weakly interacting neutralinos. We study a new class of models consisting of U(1)n hidden sector extensions of the minimal supersymmetric standard model that includes several stable particles, both fermionic and ...
In this second paper in our series, we continue to test primordial scenarios of globular cluster formation, which predict that globular clusters formed in the early universe in the potential of dark matter minihalos. In this paper we use high-resolution N-body simulations to model tidal stripping experienced by primordial dark ...
In this work Gamma Ray Burst (GRB) data is used to place constraints on a putative coupling between dark energy and dark matter. Type Ia supernovae (SNe Ia) constraints from the Sloan Digital Sky Survey II (SDSS-II) first-year results, the cosmic microwave background radiation (CMBR) shift ...
In the activity, Dark MatterA Milky Way Surprise, you encountered a ... of the mass of the universe) is dark matter, nonluminous matter, matter that cannot be ...
NASA Website
It appears that nonluminous mass (dark matter) is less concentrated in ... of the mass of the universe) is dark matter (nonluminous matter), matter that we cannot ...
We report results of a search for light (?10??GeV) particle dark matter with the XENON10 detector. The event trigger was sensitive to a single electron, with the analysis threshold of 5 electrons corresponding to 1.4�keV nuclear recoil energy. Considering spin-independent dark matter-nucleon scattering, we ...
We report results of a search for light (?10GeV) particle dark matter with the XENON10 detector. The event trigger was sensitive to a single electron, with the analysis threshold of 5 electrons corresponding to 1.4 keV nuclear recoil energy. Considering spin-independent dark matter-nucleon scattering, we exclude ...
The effects of astrophysical uncertainties on the exclusion limits at dark matter direct detection experiments are investigated for three scenarios: elastic, momentum dependent, and inelastically scattering dark matter. We find that varying the dark matter galactic escape ...
Jan 4, 2001 ... What is the difference between Dark Energy and Dark Matter; aren't they ... Dark Energy appears to be, based on the brightness of the most ...
In a universe dominated by dark matter and dark energy, galaxies and their host ... of dark matter halos is therefore a key step in understanding galaxy ...
Two mechanisms by which the quintessence scalar could enhance the relic abundance of dark matter particles are discussed. These effects can have an impact on supersymmetric candidates for dark matter.
In a scenario of Higgs portal dark matter, Higgs exchange processes are essential for both dark matter annihilation in the early Universe and direct search experiments. The CDMS II Collaboration has recently released their final results on direct dark ...
Zeplin-II is a two-phase (liquid, gas) Xenon detector optimised for WIMP Dark Matter search. Both scintillation and ionisation is measured, in order to discriminate the radioactive background. It is currently running in the underground laboratory of Boulby Mine (UK). 1 ton x day exposure has been collected. The preliminary study of 10% ...
the term "dark energy" to describe this mysterious phenomenon. Dark energy, combined with dark matter, seem to be the dominant components of the universe. The NASA and DOE Dark...
Science.gov Websites
InflationInflation xx Dark MatterDark Matter xx Dark EnergyDark Energy CC��dric Pahuddric Pahud Kofman, Linde and Starobinsky (1994 & 1997) #12;Unification scenarioUnification scenario Dark Energy Dark Matter Inflation V() ~ ...
I both review and make the case for the current theoretical prejudice: a flat Universe whose dominant constituent is nonbaryonic dark matter, emphasizing that this is still a prejudice and not yet fact. The theoretical motivation for nonbaryonic dark matter is discussed in the context of current elementary-particle ...
PubMed Central
It has been suggested that dark matter particles which scatter inelastically from detector target nuclei could explain the apparent incompatibility of the DAMA modulation signal (interpreted as evidence for particle dark matter) with the null results from CDMS-II and XENON10. Among the ...
Mirror dark matter offers a framework to explain the existing dark matter direct detection experiments, including the impressive DAMA signal. Here, we examine the implications of mirror dark matter for experiments like CDMS II/Ge and XENON10 which ...
Results are presented from a reanalysis of the entire five-tower data set acquired with the Cryogenic Dark Matter Search (CDMS II) experiment at the Soudan Underground Laboratory, with an exposure of 969 kg-days. The analysis window was extended to a recoil energy of 150 keV, and an improved surface-event background-rejection cut was ...
We present two examples of velocity distributions for light dark matter particles that reconcile the annual modulation signal observed by DAMA with all other negative results from dark matter searches. They are: (1) a conventional Maxwellian distribution for particle masses around 5 to 9 GeV; (2) a ...
Girl jumping in the air, Dark Matter. Dark matter was once called "missing matter". It was called this because scientists looking at the sky could not find it. ...
Hubble Space Telescope indicates that a huge ring of dark matter likely ... How do we know that dark matter isn't just normal matter exhibiting strange gravity? ...
Dec 12, 2005 ... The work buttresses the theory that dark matter, which constitutes 90 ... Concentrations of dark matter should attract visible matter, ...
Low-temperature calorimetric particle detectors are applied to the problem of dark matter detection. These semiconductor crystal-based devices operate at sub-Kelvin temperatures. Nuclear-recoil interactions can be distinguished from electron-recoils by comparing the thermal energy yield with that in another channel, such as ionization or scintillation, ...
-relativistic dark matter constituent that interacts directly with dark energy is also considered, where the dark]; the nature of the responsible entity, called dark energy, still remains unknown. The simplest explanation matter and dark energy. In this ...
What is the density of matter that is smoothly distributed across super- clusters or larger scales? of Galaxies. Dark Matter and the Assembly ...
Model of dark matter and dark energy based on gravitational polarization -CDM and MOND finally.3518] #12;Dark matter vs MOND The dipolar fluid Outline The dark matter paradigm versus MOND Phenomenology of dark ...
Mirror matter has been proposed as a dark matter candidate. It has several very attractive features, including automatic stability and darkness, the ability to mimic the broad features of cold dark matter while in the linear density perturbation regime, and consistency with ...
The characterization of dark energy is a central task of cosmology. To go beyond a cosmological constant, we need to introduce at least an equation of state and a sound speed and consider observational tests that involve perturbations. If dark energy is not completely homogeneous on observable scales, then the Poisson equation is modified and ...
We examine decays of a spin-1 bottomonium into a pair of light scalar dark matter (DM) particles, assuming that dark matter is produced due to exchange of heavy degrees of freedom. We perform a model-independent analysis and derive formulae for the branching ratios of these decays. We confront our calculation ...
axions related to strong CP violation which affect the QCD vacuum. 2 #12;II. WIMP DARK MATTER A. General. Similarly the superpartner of the strange quark can couple to a positron and an anti-up quark. Combining competitive ones to the direct detections. 9 #12;III. AXIONS A. Theoretical Background In the SU(3)c QCD
The presence of substructures in dark matter haloes is an unavoidable consequence of the cold dark matter paradigm. Indirect signals from these objects have been extensively searched for with cosmic rays and ? rays. At first sight, Cherenkov telescopes seem not very well suited for such searches, due to their small ...
simulations of how miniscule density fluctuations of dark matter may evolve in an ... which form the cosmic scaffolding on which dark matter accumulates. ...
Astrophysics - Dark Matter Topics. Dark Matter Topics � Freedom of Information Act � Budgets, Strategic Plans and Accountability Reports ...
Feb 3, 2010 ... Such material is called "dark matter", and astronomers now believe that ... The most common method involves the fact that dark matter has a ...
Scientists study dark matter by looking at the effects it has on visible objects. Scientists believe that dark matter may account for the unexplained motions of stars ...
This has necessitated the idea of dark matter. Matter which does not interact with light and hence is 'dark,' but still has mass and can provide the extra ...
... Observing Primeval Galaxies and Dark Matter with LAIRTS 12. ... There is dark matter on many different scales in the universe. On the smallest scale. ...
DTIC Science & Technology
Nov 16, 2010 ... This recently released image is basically a map of dark matter. It shows the distribution of the dark matter in the center of the giant galaxy cluster ...
annihilation of dark matter particles produces gamma-rays which could be detected by Fermi ... annihilation of dark matter particles produces ...
galaxies to calculate the location and amount of dark matter in the cluster. They superimposed a map of these inferred dark matter concentrations, tinted blue, ...
Dark matter is the name scientists have given to the particles which we believe ... Scientists believe that dark matter may account for the unexplained ...
Dec 19, 2001 ... Explanation: Where is dark matter? Galaxies rotate and move in clusters as if a tremendous amount of unseen matter is present. But does dark ...
... Accession Number : ADA272662. Title : Exponential Potential versus Dark Matter. ... Galaxy, Dark matter, Galaxy cluster, Gravitation, Quantum gravity. ...
Jan 31, 2006 ... We know that Dark Matter exists because we have found some here on Earth, ... Scientists can deduce the presence of Dark Matter from: ...
Sep 15, 2004 ... We know that Dark Matter exists because we have found some here on Earth, ... Scientists can deduce the presence of Dark Matter from: ...
gas infall into clumps within the dark matter potential of the group, and that ..... effects, then we do not require any dark matter in this galaxy. ...
Jun 1, 1990 ... Students will explore dark matter by first calculating the escape ... Students should be familiar with the article on Dark Matter from the ...
Technology News: Space: Dark Matter Detector Poised for Magical Mystery Tour. 9/1/2010 ... mission of searching the universe for dark matter. The detector ...
Nov 5, 2009 ... Dark Matter Constraints from Observations of Dwarf Spheroidal ... Indirect searches for dark matter signals have been conducted with the ...
Dark MatterMore Than Meets the Eye. Student Text Supplement. Cosmic Chemistry: Cosmogony. Dark MatterMore Than Meets the Eye. Student Text Supplement ...
dark matter or only to baryonic objects which may be formed ... difference between dark matter and the baryonic object in a ...
May 15, 2007 ... Astronomers Find Ring of Dark Matter With Hubble Space Telescope ... Dark matter makes up most of the universe's material. ...
Representing the GLAST LAT Collaboration Dark Matter and New Physics Working .... Dark Matter currently makes up 20% of the energy density of the universe. ...
Feb 7, 2005 ... Most of the material in the Universe seems to be invisible, something astronomers call "dark matter". Dark matter is defined by its ...
APOD: 2001 December 19 - Finding Dark Matter Explanation: Where is dark matter? Galaxies rotate and move in clusters as if a tremendous amount of unseen ...
The EDELWEISS-II experiment is aimed at direct search for nonbarion cold dark matter. The important problem of the experiment is a decrease in the 222Rn background and its daughter products without which it is impossible to achieve a record sensitivity to the scattering cross section of dark ...
If non-baryonic dark matter exists in the form of neutralinos, a neutrino flux is expected from the decay of neutralino pair annihilation products inside heavy celestial bodies. Data taken with the AMANDA-II neutrino telescope located at the South Pole, have been used in a search for this indirect dark ...
) of the Universe Cosmology The first stars/galaxies Direct measure of deceleration Evolution of cosmic parameters Dark matter, dark energy #12;ALMA CONTEXT: II decade, III millennium AD VLTI II gen instr JWST XEUS GSMT orbiting other stars? Direct detection of earth-like planets in nearby ...
In the framework of type II seesaw mechanism we discuss the number of sterile right-handed Majorana neutrinos being the warm dark matter (WDM). When the type II seesaw mass term M?II is far less than the type I seesaw mass term M?I, only one of three sterile neutrinos may be the WDM particle. ...
The next generation of ground-based Imaging Air Cherenkov Telescopes will play an important role in indirect dark matter searches. In this article, we consider two particularly promising candidate sources for dark matter annihilation signals, the nearby dwarf galaxies Draco and Willman 1, and study the prospects of ...
We investigate potential constraints from cosmic shear on the dark matter particle mass, assuming all dark matter is made up of light thermal relic particles. Given the theoretical uncertainties involved in making cosmological predictions in such warm dark matter scenarios ...
A strong theoretical candidate for weakly interacting massive particles (WIMPS) is the neutralino. The neutralino is the lightest supersymmetric particle (LSP), from the supersymmetry (SUSY) theory, that would be formed in the early universe and subsequently cluster in galaxies with normal matter. This could account for �90% non-luminous matter inferred ...
