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star apple
I assume UV means high energy (small scale) and IR is low energy (large scale).. but what is the exact origin of its use in particle physics? Why IR, UV, and not Gamma?
Thank you.
Thank you.
What do those abbreviations stand for?star apple said:I assume UV means high energy (small scale) and IR is low energy (large scale).. but what is the exact origin of its use in particle physics? Why IR, UV, and not Gamma?
Thank you.
Because IR and UV are both within the domain which is interesting to most humans.="star apple, post: 5870221, member: 632800"Why IR, UV, and not Gamma?
Thank you.
rootone said:Because IR and UV are both within the domain which is interesting to most humans.
While gamma rays are also interesting, they are nasty, most people really don't want to play with it.
star apple said:Why IR, UV, and not Gamma?
berkeman said:What do those abbreviations stand for?
And what does the equation E=hν represent?
star apple said:I just wonder why are these always mentioned in high energy physics.
davenn said:give a link to an example of that
did you find out where on the spectrum they are relative to each other ?
star apple said:I just wonder why are these always mentioned in high energy physics.
star apple said:Does it mean when v corresponds to UV and IR, the E corresponds to certain energy scale directly used in particle physics??
Drakkith said:As far as I'm aware, UV and IR are of essentially no interest to particle physicists, as both are of relatively low energy compared to the EM radiation produced during decay processes that turn one or more particles into others.
I don't believe so.
star apple said:See page 11 of https://arxiv.org/pdf/1710.07663.pdf for example
"A theory that manifests an active interplay between the IR and the UV would not be
simply describable by an effective field theory, as it would violate its inner logic. It is not
impossible that quantum gravity will exhibit some kind of IR/UV interplay. An indication
could come from the classical behaviour of gravity. Consider the head-on collision of two
particles at ever increasing energies. Once you pass the threshold for forming a black hole,
the more energy you feed in the system the larger the Schwarzschild radius becomes. In
other words, higher energy collisions are less sensitive to short distances, in contrast with
our effective-theory intuition for a separation between IR and UV."
What is the context of IR and UV in particle physics?
The word "ultraviolet" in this so-called "ultraviolet regime" is only figurative, and refers to energies much higher than ultraviolet light per se. Rather, by analogy to the relationship between ultraviolet and visible light, it refers to energies higher than (and wavelengths shorter than) those "visible" to laboratory experiment.
...
There is an analogous phrase "infrared completion", which applies to length scales longer than those "visible" to normal experiment, particularly cosmology distances.
Drakkith said:From my little reading on this, I think that UV simply refers to an arbitrarily large energy scale above the visible spectrum. I assume IR is the scale under the visible or under the UV range. From wikipedia's article on UV completion:
IR (infrared) and UV (ultraviolet) refer to different regions of the electromagnetic spectrum. In particle physics, IR and UV are used to describe the energies of particles and interactions. IR typically refers to lower energy levels, while UV refers to higher energy levels.
Understanding the origins of IR and UV in particle physics is important because it can provide insight into the fundamental laws of nature and the behavior of particles. It can also help us understand the origin and evolution of the universe, as well as aid in the development of new technologies.
Scientists use a variety of tools and techniques, such as particle accelerators and detectors, to study the origins of IR and UV in particle physics. They also conduct experiments and analyze data to test and refine theories about the behavior of particles at different energy levels.
Understanding the origins of IR and UV in particle physics can have many practical applications, such as in the development of new medical imaging technologies, improved energy production and storage methods, and advancements in communication and computing systems. It can also have implications for space exploration and defense technologies.
Yes, there are several theories and hypotheses about the origins of IR and UV in particle physics, including the Standard Model of particle physics, which describes the fundamental particles and their interactions, and theories such as supersymmetry and string theory, which attempt to explain the behavior of particles at higher energy levels. However, there is still much to be discovered and understood in this field of study.