A Direct Empirical Proof of the Existence of Dark Matter
... vary between 0.5 and 3) and depends on the history of recent star formation of the galaxies in the apertures; however even in the case of an extreme deviation, the Xray plasma is still the dominant baryonic component in all of the apertures. The quoted errors are only the errors on measuring the lum ...
... vary between 0.5 and 3) and depends on the history of recent star formation of the galaxies in the apertures; however even in the case of an extreme deviation, the Xray plasma is still the dominant baryonic component in all of the apertures. The quoted errors are only the errors on measuring the lum ...
TED Connection: Far, far away galaxies and why they matter
... cluster enables it to bend light and magnify the light of galaxies behind it, a process called “gravitational lensing.” In the image above, find some examples of bent (curved) light. Think of something on Earth that is enormous and describe a trait that its size gives it that something similar yet s ...
... cluster enables it to bend light and magnify the light of galaxies behind it, a process called “gravitational lensing.” In the image above, find some examples of bent (curved) light. Think of something on Earth that is enormous and describe a trait that its size gives it that something similar yet s ...
ppt - Pierre-Hugues Beauchemin
... Data-driven techniques 101 (I) Reduce systematic uncertainty by replacing MC distribution with well understood data distribution similar to the process of interest to ...
... Data-driven techniques 101 (I) Reduce systematic uncertainty by replacing MC distribution with well understood data distribution similar to the process of interest to ...
The Family Problem: Extension of Standard Model with a Loosely
... standard model. In addition to QCD and electroweak (EW) phase transitions there is other SU_f(3) family phase transition occurring near the familon masses, maybe above the EW scale (that is, above 1 TeV). One motivation is that in our Universe there is 25% dark matter vs 5% ordinary matter – dark ma ...
... standard model. In addition to QCD and electroweak (EW) phase transitions there is other SU_f(3) family phase transition occurring near the familon masses, maybe above the EW scale (that is, above 1 TeV). One motivation is that in our Universe there is 25% dark matter vs 5% ordinary matter – dark ma ...
The Missing Mass
... Mass Measurements in Galaxy Clusters For a group of objects, there always must be balance between gravity and velocity. Too little velocity, and gravity takes over, making the cluster smaller. Too much velocity, and the objects escape the group’s gravity, causing the group to evaporate. ...
... Mass Measurements in Galaxy Clusters For a group of objects, there always must be balance between gravity and velocity. Too little velocity, and gravity takes over, making the cluster smaller. Too much velocity, and the objects escape the group’s gravity, causing the group to evaporate. ...
In Search of the Dark Matter in the Universe
... the physical laws at this young age of the universe, tell us that physics was much simpler at that time, since there was only one force ruling everything. Today, however, we distinguish four fundamental forces: the force of gravity, which attracts us to the earth and the planets to the sun, the elec ...
... the physical laws at this young age of the universe, tell us that physics was much simpler at that time, since there was only one force ruling everything. Today, however, we distinguish four fundamental forces: the force of gravity, which attracts us to the earth and the planets to the sun, the elec ...
Dark Matter Capture in the first stars
... DAMA, HEAT, gamma-rays from galactic center • Effect of mass distribution in Halo on detection: Sagittarius stream can be a smoking gun for WIMP detection • III) DARK STARS: dark matter in the first stars produces a new phase of stellar evolution! ...
... DAMA, HEAT, gamma-rays from galactic center • Effect of mass distribution in Halo on detection: Sagittarius stream can be a smoking gun for WIMP detection • III) DARK STARS: dark matter in the first stars produces a new phase of stellar evolution! ...
The states of matter
... Firstly, the three basic states of matter that can be achieved under normal conditions: Solid, Liquid and Gas. These three states of matter are taught to the student of Singapore in Primary 4. The forth state of matter, Plasma, is only discussed in certain classrooms. These three states of matter a ...
... Firstly, the three basic states of matter that can be achieved under normal conditions: Solid, Liquid and Gas. These three states of matter are taught to the student of Singapore in Primary 4. The forth state of matter, Plasma, is only discussed in certain classrooms. These three states of matter a ...
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.