In theoretical physics, cutoff is the maximal or minimal value of energy, momentum, or length, so that the objects with even larger or smaller values than these physical quantities are ignored. It is usually represented within a particular energy or length scale, such as Planck units.
An infrared cutoff (long-distance cutoff) is the minimal value of energy - or, equivalently, the maximal wavelength (usually a very large distance) - that we take into account. On the contrary, an ultraviolet cutoff is the maximal allowed energy or the shortest allowed distance (usually a very short length scale). If some quantities are computed as integrals over energy or another physical quantity, these cutoffs determine the limits of integration. The exact physics is reproduced when the appropriate cutoffs are sent to zero or infinity. However, these integrals are often divergent - see IR divergence and UV divergence - and a cutoff is needed. The dependence of physical quantities on the chosen cutoffs (especially the ultraviolet cutoffs) is the main focus of the theory of renormalization group.
I Wrote-During Covid-Which is still relevant now
It's good to get these types of threads, the ridiculous my manager said bollox, so we can reassure ourselves that while the world is falling apart, Royal Mail managers are still being the low-life C***S they have always been. My BFF Clash The daily grind of having to argue your case with an intellectual pigmy of a line manager is physically and emotionally draining.
In theoretical physics, cutoff is the maximal or minimal value of energy, momentum, or length, so that the objects with even larger or smaller values than these physical quantities are ignored. It is usually represented within a particular energy or length scale, such as Planck units.
An infrared cutoff (long-distance cutoff) is the minimal value of energy - or, equivalently, the maximal wavelength (usually a very large distance) - that we take into account. On the contrary, an ultraviolet cutoff is the maximal allowed energy or the shortest allowed distance (usually a very short length scale). If some quantities are computed as integrals over energy or another physical quantity, these cutoffs determine the limits of integration. The exact physics is reproduced when the appropriate cutoffs are sent to zero or infinity. However, these integrals are often divergent - see IR divergence and UV divergence - and a cutoff is needed. The dependence of physical quantities on the chosen cutoffs (especially the ultraviolet cutoffs) is the main focus of the theory of renormalization group.
PHYSICS!. For everything has an equal and opposite reaction or if you will everything has a value but my DOM know's the cost of everything and the value of nothing!.
In theoretical physics, cutoff is the maximal or minimal value of energy, momentum, or length, so that the objects with even larger or smaller values than these physical quantities are ignored. It is usually represented within a particular energy or length scale, such as Planck units.
An infrared cutoff (long-distance cutoff) is the minimal value of energy - or, equivalently, the maximal wavelength (usually a very large distance) - that we take into account. On the contrary, an ultraviolet cutoff is the maximal allowed energy or the shortest allowed distance (usually a very short length scale). If some quantities are computed as integrals over energy or another physical quantity, these cutoffs determine the limits of integration. The exact physics is reproduced when the appropriate cutoffs are sent to zero or infinity. However, these integrals are often divergent - see IR divergence and UV divergence - and a cutoff is needed. The dependence of physical quantities on the chosen cutoffs (especially the ultraviolet cutoffs) is the main focus of the theory of renormalization group.
Excellent quantum physics and cosmology, did that with the OU well interesting. I did a bit of o/t today (paid of coarse) and was thinking about redshifts and galaxy clusters . Actually i was listening to Arctic Monkeys much more exciting.
Actually i was listening to Arctic Monkeys much more exciting.