Otis Singleton
Dark matter is a hypothetical form of matter that does not interact with light or other electromagnetic radiation. It is invisible and has never been directly observed, but its existence is inferred from its gravitational effects on visible matter. Dark matter is thought to make up around 26-27% of the universe's mass, with dark energy contributing approximately 68% and ordinary matter only accounting for 5%. The behaviour of galaxies, including their formation and evolution, is largely explained by the existence of dark matter. While the exact nature of dark matter remains unknown, it is believed to be composed of particles beyond the Standard Model, such as supersymmetric particles, axions, or Weakly Interacting Massive Particles (WIMPs). The study of dark matter and its role in the universe, including its potential electric charge, is an ongoing area of research for astronomers and cosmologists.
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What You'll Learn
- Dark matter is a hypothetical form of matter that is invisible and does not interact with light
- It is implied by gravitational effects that cannot be explained by general relativity
- Dark matter is thought to serve as gravitational scaffolding for cosmic structures
- It is believed that dark matter, along with dark energy, makes up most of the universe's mass
- Experiments at the Large Hadron Collider (LHC) may provide more direct clues about dark matter
Dark matter is a hypothetical form of matter that is invisible and does not interact with light
The existence of dark matter is implied by gravitational effects that cannot be explained by general relativity unless there is more matter present than can be observed. This is evident in the formation and evolution of galaxies, gravitational lensing, the current structure of the observable universe, mass position in galactic collisions, the motion of galaxies within galaxy clusters, and cosmic microwave background anisotropies.
Dark matter is thought to serve as gravitational scaffolding for cosmic structures. After the Big Bang, it clumped into blobs along narrow filaments, with superclusters of galaxies forming a cosmic web at scales on which entire galaxies appear like tiny particles. The rotation of galaxies is so rapid that the gravity generated by their observable matter could not hold them together, and they should have torn themselves apart long ago. This leads scientists to believe that dark matter is giving these galaxies extra mass, generating the extra gravity they need to stay intact.
There are many hypotheses about what dark matter could consist of. One idea is that it contains "supersymmetric particles", which are hypothesized to be partners to those already known in the Standard Model. Experiments at the Large Hadron Collider (LHC) may provide more direct clues about dark matter. Many theories suggest that dark matter particles would be light enough to be produced at the LHC, and their existence could be inferred from the amount of energy and momentum "missing" after a collision. Other possibilities include axions, primordial black holes, and weakly interacting massive particles (WIMPs).
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It is implied by gravitational effects that cannot be explained by general relativity
The existence of dark matter is implied by gravitational effects that cannot be explained by general relativity alone. This implies that there is some form of matter that we cannot see directly, but which exerts a gravitational influence on the universe.
In the context of the electric universe theory, which proposes that electricity and magnetism play a more fundamental role in the cosmos than previously thought, the question arises as to whether dark matter is still necessary to explain these gravitational anomalies. Proponents of the electric universe theory often argue that the dynamics of galaxies and galactic clusters can be better explained by the electromagnetic forces between charged particles, rather than relying solely on gravity.
However, despite the intriguing ideas put forth by the electric universe theory, it has not gained widespread acceptance in the scientific community. The theory faces several challenges and criticisms, particularly due to its inability to fully explain certain phenomena that are more readily accounted for by dark matter.
General relativity, a cornerstone of modern physics, successfully describes gravity as the curvature of spacetime caused by mass and energy distributions. However, when applied to larger cosmic structures, such as galaxies and galactic clusters, there are discrepancies between observed gravitational effects and those predicted by general relativity based on the visible mass alone. This has led to the proposal of dark matter as a hypothetical form of matter that eludes direct detection through electromagnetic radiation, yet contributes to the gravitational forces shaping the cosmos.
In summary, while the electric universe theory offers an alternative perspective on cosmic dynamics, it falls short of providing a comprehensive alternative to dark matter. The concept of dark matter remains a crucial component in our current understanding of the universe, helping to explain various gravitational phenomena that cannot be adequately addressed by the electric universe theory alone. Further scientific inquiry and empirical evidence are needed to refine our understanding of dark matter and its role in the cosmos.
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Dark matter is thought to serve as gravitational scaffolding for cosmic structures
Dark matter is a hypothetical and invisible form of matter that does not interact with light or other electromagnetic radiation. It is implied by gravitational effects that cannot be explained by general relativity unless there is more matter present than can be observed. Dark matter is thought to serve as gravitational scaffolding for cosmic structures.
After the Big Bang, dark matter clumped into blobs along narrow filaments, with superclusters of galaxies forming a cosmic web at scales on which entire galaxies appear like tiny particles. This process laid the groundwork for the hierarchical formation of cosmic structures: first small halos, then galaxies, and eventually galaxy groups and clusters. Dark matter halos thus represent the invisible scaffolding upon which the luminous architecture of the universe is built.
Numerical simulations, such as those from the Millennium Simulation, Bolshoi-Planck, and IllustrisTNG, provide a robust visualization of this structure formation. These simulations demonstrate how filaments of dark matter coalesce into a vast, sponge-like network—commonly referred to as the cosmic web—with galaxies forming at the nodes where filaments intersect. Dark matter provides a solution to the problem of how galaxies can maintain their rotational speed without tearing themselves apart, as they seem to have more mass than can be observed.
Dark matter is also critical to our understanding of the evolution of the universe. Dark matter governs the formation of galaxies and galaxy clusters, while dark energy, which makes up approximately 68% of the universe, dominates the future, pushing galaxies farther and farther apart.
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It is believed that dark matter, along with dark energy, makes up most of the universe's mass
In astronomy, dark matter is a hypothetical and invisible form of matter that does not interact with light or other electromagnetic radiation. It is implied by gravitational effects that cannot be explained by general relativity unless there is more matter present than can be observed. Dark matter is thought to serve as gravitational scaffolding for cosmic structures. It is believed that dark matter, along with dark energy, makes up most of the universe's mass.
The matter that we know of, which makes up all stars and galaxies, accounts for only 5% of the content of the universe. The rest is composed of dark matter and dark energy, which are invisible but dominate the structure and evolution of the universe. Dark matter makes up most of the mass of galaxies and galaxy clusters and is responsible for the way galaxies are organized on a grand scale. Dark matter can be divided into cold, warm, and hot categories. These categories refer to velocity rather than an actual temperature and indicate how far corresponding objects moved due to random motions in the early universe before they slowed due to cosmic expansion.
Dark energy, on the other hand, is the name given to the mysterious influence driving the accelerated expansion of the universe. Dark energy makes up approximately 68% of the universe and appears to be associated with the vacuum in space. It is distributed evenly throughout the universe, not only in space but also in time. This even distribution means that dark energy does not have any local gravitational effects but rather a global effect on the universe as a whole, leading to a repulsive force that accelerates the expansion of the universe.
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Experiments at the Large Hadron Collider (LHC) may provide more direct clues about dark matter
Dark matter is an invisible and hypothetical form of matter that does not interact with light or other electromagnetic radiation. It is inferred to exist due to the gravitational effects it seems to have on visible matter. Dark matter is thought to make up about 27% of the universe, while ordinary matter, which makes up all stars and galaxies, only accounts for 5% of the universe's content.
The Large Hadron Collider (LHC) has been instrumental in the search for the hypothetical particle that may constitute dark matter. The LHC is renowned for its discovery of the Higgs boson, and researchers have been leveraging its capabilities to hunt for dark matter particles. The LHC experiments involve colliding beams of protons at extremely high energies to create conditions that may produce dark matter particles.
While the LHC dark matter searches have not yet yielded direct detection, the knowledge and skill exhibited by the researchers have helped narrow down potential regions where dark matter particles may be found. The LHC experiments complement other approaches, such as using telescopes to look for indirect signals of dark matter particles in space and employing underground detectors to capture the interactions of these particles with atomic nuclei.
The FASER experiment, which collaborates with the main LHC experiments, is expected to enhance the search for non-WIMP dark matter. Additionally, the LHC researchers are analyzing data from previous runs, and with the vast amount of data yet to be explored, there is optimism that the LHC may discover a dark matter particle in the coming years.
The experiments at the LHC are crucial because they may provide more direct clues about dark matter. If dark matter particles are created at the LHC, they will not be directly observable, but their presence can be inferred from the energy and momentum "missing" after a collision. The LHC's high-energy collisions and particle detection capabilities offer a unique opportunity to study these elusive particles and gain a deeper understanding of the nature of dark matter.
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Frequently asked questions
Dark matter is an invisible and hypothetical form of matter that does not interact with light or other electromagnetic radiation. It is thought to serve as gravitational scaffolding for cosmic structures.
Scientists study dark matter by observing galaxies to measure its effects on their structure and evolution. They also create theoretical models of dark matter behaviour from observational data.
The existence of dark matter is inferred from its gravitational effect on visible matter. The galaxy cluster known as the Bullet Cluster provides some of the best evidence for the existence of dark matter.
The exact composition of dark matter is unknown. One idea is that it could contain "supersymmetric particles" – hypothesized partners to those already known in the Standard Model. Another theory suggests the existence of a “Hidden Valley”, a parallel world made of dark matter.
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