powerpoint
... Clusters of Galaxies • In 20’s, Zwicky pointed out that the velocity dispersion of the Coma cluster is inconsistent with its self-gravity • One expects v2=GM/R, the mass inferred this way is 100 times larger than the inferred stellar mass ...
... Clusters of Galaxies • In 20’s, Zwicky pointed out that the velocity dispersion of the Coma cluster is inconsistent with its self-gravity • One expects v2=GM/R, the mass inferred this way is 100 times larger than the inferred stellar mass ...
Dark Matter - the stuff of the Universe?
... look for neutrino oscillations—change of neutrino type (depends on difference between masses of the two types) these do happen but the implied mass is very small indeed ...
... look for neutrino oscillations—change of neutrino type (depends on difference between masses of the two types) these do happen but the implied mass is very small indeed ...
Kg m/s2=SI(G) kg2/m2
... squarks, or darkon (I think, I just made up the last one darkon, but who knows what some tortured particle physicist may have used darkon in desperation before me.) or quintessence can be said to have been discovered when this was modified last on February 12, 2005. The previous paragraph was to jus ...
... squarks, or darkon (I think, I just made up the last one darkon, but who knows what some tortured particle physicist may have used darkon in desperation before me.) or quintessence can be said to have been discovered when this was modified last on February 12, 2005. The previous paragraph was to jus ...
Why is the darkness of the night sky evidence for the Big Bang?
... A wormhole could be kept open by filling its throat, or the region around it, with an ingredient called exotic matter. This is strange stuff which doesn’t exist in the classical physics world, but may be allowed by quantum physics. Exotic matter is repelled, rather than attracted, by gravity and is ...
... A wormhole could be kept open by filling its throat, or the region around it, with an ingredient called exotic matter. This is strange stuff which doesn’t exist in the classical physics world, but may be allowed by quantum physics. Exotic matter is repelled, rather than attracted, by gravity and is ...
1time/100kg day），producing atomic recoil， Direct detection of dark
... Good to distinguish signals，ton scale ...
... Good to distinguish signals，ton scale ...
What is the Universe made of?
... people are made from. All matter is made up of combinations of 6 quarks, 6 leptons and their antiparticles. Particles such as the electron and neutrino are known as leptons. Particles such as the proton and neutron are made of three quarks, and are called baryons. Scientists often refer to ordinary ...
... people are made from. All matter is made up of combinations of 6 quarks, 6 leptons and their antiparticles. Particles such as the electron and neutrino are known as leptons. Particles such as the proton and neutron are made of three quarks, and are called baryons. Scientists often refer to ordinary ...
Dark matter density profiles in dwarf satellites
... Dwarf spheroidal satellites of the Milky Way are a prime target for dark matter indirect searches. E.g., upper limits on gamma-ray fluxes in their directions, obtained with the Fermi Large Area Telescope, have been recently used to update constraints on weakly interacting massive particles (WIMPs), ...
... Dwarf spheroidal satellites of the Milky Way are a prime target for dark matter indirect searches. E.g., upper limits on gamma-ray fluxes in their directions, obtained with the Fermi Large Area Telescope, have been recently used to update constraints on weakly interacting massive particles (WIMPs), ...
Print/Download as PDF - Youth Science Canada
... school science fair, I found a diagram of the Big Bang in a National Geographic magazine. From a pie chart called "What Is Our Universe Made of?" I learned that no one knows what approximately 95% of the universe is made of, and that immediately interested me. I have been interested in particle phys ...
... school science fair, I found a diagram of the Big Bang in a National Geographic magazine. From a pie chart called "What Is Our Universe Made of?" I learned that no one knows what approximately 95% of the universe is made of, and that immediately interested me. I have been interested in particle phys ...
Dark Matter and Its Direct Detection
... If Dark Matter has weak interactions and its mass is less than 3-5TeV, they can be pair-produced at LHC ...
... If Dark Matter has weak interactions and its mass is less than 3-5TeV, they can be pair-produced at LHC ...
Our Universe is big, beautiful… and mostly
... that it has on the things around it – like seeing a sofa cushion being pushed down by an invisible man. In this picture, anywhere containing matter – both visible and invisible stuff – has been coloured in blue by astronomers. Can you spot some blue regions that don't contain any galaxies? That's dar ...
... that it has on the things around it – like seeing a sofa cushion being pushed down by an invisible man. In this picture, anywhere containing matter – both visible and invisible stuff – has been coloured in blue by astronomers. Can you spot some blue regions that don't contain any galaxies? That's dar ...
Introduction to Electromagnetism
... Neutrinos are significant – though they have tiny mass, there are very many of them (over 1090), but still they are less than 30% of dark matter Probably WIMPS – Weakly Interacting Massive Particles – not yet discovered... ...
... Neutrinos are significant – though they have tiny mass, there are very many of them (over 1090), but still they are less than 30% of dark matter Probably WIMPS – Weakly Interacting Massive Particles – not yet discovered... ...
Bruemmer-Dark Matter
... rather than being randomly distributed Spatial distribution of matter in an astronomical system (galaxies, clusters, etc.): ...
... rather than being randomly distributed Spatial distribution of matter in an astronomical system (galaxies, clusters, etc.): ...
Dark Matter in the Universe
... space against the attractive (collapsing) effects of gravity. ΩΛ, which is interpreted as the fraction of the total mass-energy density of a flat universe that is attributed to dark energy. Currently, about 74% of the energy density of the present universe is estimated to be dark energy. ...
... space against the attractive (collapsing) effects of gravity. ΩΛ, which is interpreted as the fraction of the total mass-energy density of a flat universe that is attributed to dark energy. Currently, about 74% of the energy density of the present universe is estimated to be dark energy. ...
Revealing the nature of dark energy
... Missing energy: Dark Energy (energy that is not matter) Missing matter: Dark Matter (matter that doesn’t shine) ...
... Missing energy: Dark Energy (energy that is not matter) Missing matter: Dark Matter (matter that doesn’t shine) ...
Dark matter
Dark matter is a hypothetical kind of matter that cannot be seen with telescopes but would account for most of the matter in the universe. The existence and properties of dark matter are inferred from its gravitational effects on visible matter, on radiation, and on the large-scale structure of the universe. Dark matter has not been detected directly, making it one of the greatest mysteries in modern astrophysics.Dark matter neither emits nor absorbs light or any other electromagnetic radiation at any significant level. According to the Planck mission team, and based on the standard model of cosmology, the total mass–energy of the known universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy. Thus, dark matter is estimated to constitute 84.5% of the total matter in the universe, while dark energy plus dark matter constitute 95.1% of the total mass–energy content of the universe.Astrophysicists hypothesized the existence of dark matter to account for discrepancies between the mass of large astronomical objects determined from their gravitational effects, and their mass as calculated from the observable matter (stars, gas, and dust) that they can be seen to contain. Their gravitational effects suggest that their masses are much greater than the observable matter survey suggests. Dark matter was postulated by Jan Oort in 1932, albeit based upon insufficient evidence, to account for the orbital velocities of stars in the Milky Way. In 1933, Fritz Zwicky was the first to use the virial theorem to infer the existence of unseen matter, which he referred to as dunkle Materie 'dark matter'. More robust evidence from galaxy rotation curves was discovered by Horace W. Babcock in 1939, but was not attributed to dark matter. The first hypothesis to postulate ""dark matter"" based upon robust evidence was formulated by Vera Rubin and Kent Ford in the 1960s–1970s, using galaxy rotation curves. Subsequently, many other observations have indicated the presence of dark matter in the universe, including gravitational lensing of background objects by galaxy clusters such as the Bullet Cluster, the temperature distribution of hot gas in galaxies and clusters of galaxies and, more recently, the pattern of anisotropies in the cosmic microwave background. According to consensus among cosmologists, dark matter is composed primarily of a not yet characterized type of subatomic particle.The search for this particle, by a variety of means, is one of the major efforts in particle physics today.Although the existence of dark matter is generally accepted by the mainstream scientific community, some alternative theories of gravity have been proposed, such as MOND and TeVeS, which try to account for the anomalous observations without requiring additional matter. However, these theories cannot account for the properties of galaxy clusters.