In particle physics, WISP stands for "Weakly Interacting Slim Particle." Wisps are hypothetical particles that are considered as candidates for dark matter. They are characterized by their weak interactions with standard model particles, making them difficult to detect directly. WISPs usually include particles like axions, hidden photons, or other similar entities that could constitute non-baryonic matter in the universe.
Vera Rubin was a renowned American astronomer known for her groundbreaking work in the field of astrophysics, particularly in the study of galaxy rotation curves. Born on July 23, 1928, she made significant contributions to our understanding of dark matter, a form of matter that does not emit light or energy and is not directly observable, yet is believed to make up a substantial portion of the total mass in the universe. Rubin's most notable work involved observing the rotational speeds of galaxies.
Strongly Interacting Massive Particles (SIMP) are a proposed type of elementary particle that arise in certain theories of particle physics, specifically in the context of dark matter. SIMPs are characterized by their large mass and strong interactions, similar to those of the particles that make up atomic nuclei (like protons and neutrons) which are governed by the strong nuclear force.
A sterile neutrino is a hypothetical type of neutrino that does not interact via the standard weak interactions like the three known types of neutrinos: electron neutrinos, muon neutrinos, and tau neutrinos. Instead, sterile neutrinos are proposed to interact only through gravity and possibly via mixing with active neutrinos, making them "sterile" because they do not participate in the weak force.
Self-interacting dark matter (SIDM) is a theoretical alternative to the more commonly discussed weakly interacting massive particles (WIMPs) as a candidate for dark matter. The key feature of SIDM is that the particles making up dark matter can interact with each other through a force other than gravity, which is not the case for most traditional dark matter models.
Scalar field dark matter is a theoretical model in the field of cosmology and particle physics that proposes dark matter as a type of scalar field rather than as particles like Weakly Interacting Massive Particles (WIMPs) or axions. In simple terms, a scalar field is defined by a single value (a scalar) at every point in space and time, which can vary from one point to another.
Primordial black holes (PBHs) are hypothetical black holes that may have formed soon after the Big Bang, during the early universe. Unlike stellar black holes, which form from the gravitational collapse of massive stars at the end of their life cycles, primordial black holes are thought to have formed from density fluctuations in the very early universe.
Particle chauvinism is a term used in the context of physics, particularly in discussions surrounding the interpretations and implications of quantum mechanics and particle physics. It refers to the viewpoint or bias that emphasizes the primacy of particles (like electrons, photons, quarks, etc.) in understanding the fundamental nature of reality, often to the exclusion of other potential explanations or frameworks, such as fields or waves.
A neutrino is a subatomic particle that is part of the Standard Model of particle physics. It is electrically neutral, has an incredibly small mass (which is still not precisely measured but is known to be much less than that of an electron), and interacts very weakly with other matter, meaning it can pass through ordinary matter almost undetected.
Neutralino is a lightweight framework for building cross-platform desktop applications using web technologies such as HTML, CSS, and JavaScript. It enables developers to create applications that can run on multiple operating systems, including Windows, macOS, and Linux, without needing to learn platform-specific programming languages or frameworks. Neutralino provides a simple API that allows developers to integrate features commonly found in desktop applications, such as file handling, system notifications, and more, while leveraging the ease of web development.
The Mészáros effect refers to a phenomenon in astrophysics, particularly in the study of gamma-ray bursts (GRBs). It is named after the Hungarian astrophysicist Pál Mészáros. The effect is primarily associated with the late-time behavior of GRBs and relates to the mechanisms of energy release and emission from these astronomical events.
Mixed dark matter refers to a theoretical framework in cosmology and astrophysics that posits the existence of multiple types of dark matter particles, which can have different properties and behaviors. Generally, dark matter is understood as a form of matter that does not emit, absorb, or reflect light, making it undetectable by traditional astronomical instruments. Instead, its presence is inferred from gravitational effects on visible matter, radiation, and the large-scale structure of the universe.
Mirror matter is a hypothetical form of matter that is proposed to exist in a "mirror" version of the ordinary matter we encounter every day. The concept arises from certain theories in particle physics and cosmology, particularly in relation to symmetries in nature. In the context of particle physics, mirror matter would consist of particles that correspond to the known particles but with opposite chirality or "handedness.
Minicharged particles are hypothetical particles in particle physics that possess a fractional electric charge, typically much smaller than the elementary charge (the charge of an electron or proton, denoted as \( e \)). Instead of carrying a whole number of the fundamental charge, these particles might carry a charge that is a fraction of \( e \), such as \( \epsilon e \), where \( \epsilon \) is a small dimensionless number.
Meta-cold dark matter (MCDM) is a theoretical concept in cosmology and particle physics that extends the idea of cold dark matter (CDM), a type of dark matter that moves slowly compared to the speed of light and is believed to make up a significant portion of the universe's mass. Cold dark matter models have been successful in explaining a wide range of astronomical observations, including the formation of large-scale structures in the universe.
A Massive Compact Halo Object (MACHO) is a hypothetical type of astronomical object that is proposed to exist in the halo of galaxies, particularly the Milky Way. MACHOs are believed to be composed of ordinary matter, mainly in the form of objects such as brown dwarfs, white dwarfs, neutron stars, or even black holes. They are "compact" because they have a relatively small size compared to their mass, leading to a high density.
MACS J0416.1-2403 is a galaxy cluster located in the constellation of Centaurus. It is part of the Massive Cluster Survey (MACS), which is a project aimed at identifying and studying massive galaxy clusters at high redshifts. This particular cluster is notable for its significant mass and lensing properties. One of the key features of MACS J0416.
The lightest supersymmetric particle (LSP) is a concept from supersymmetry (SUSY), a theoretical framework in particle physics that extends the Standard Model. In SUSY, every Standard Model particle has a superpartner with differing spin characteristics.
Light dark matter refers to a class of hypothetical dark matter candidates that have a relatively low mass compared to traditional dark matter models like Weakly Interacting Massive Particles (WIMPs). While WIMPs are typically on the scale of hundreds of GeV (giga-electronvolts), light dark matter candidates can have masses that are much smaller, often in the range of a few MeV (mega-electronvolts) to a few GeV.