States Observables: Are They Really Different? - Physics Forums Usually states and observables are treated as fundamentally different entities in quantum theory But are they really different? Yes, they are different There are basic observables (+basic "observable like" constituents of possible Hamiltonians) that implicitly define the locality structure of "a given" system under consideration
Learn Observables in Mathematical Quantum Field Theory The following is one chapter in a series on Mathematical Quantum Field Theory The previous chapter is 6 Symmetries The next chapter is 8 Phase space 7 Observables In this chapter we discuss these topics: General observables Polynomial off-shell observables and Distributions Polynomial on-shell observables and Distributional solutions to PDEs Local observables and Transgression
About non-observable assumptions - Physics Forums A theory is allowed to make non-observable statements, as long as it also makes some observable statements The problem appears when we have two (or more) theories which make the same observable statements but different non-observable statements Which of the two theories should we use? The simpler one? The one which makes a smaller number of non-observable statements? The one that better fits
The Universe vs Observable Universe - Physics Forums The discussion revolves around the distinction between the observable universe and the entire universe, exploring concepts related to cosmology, the Big Bang, and the implications of cosmic expansion Participants seek to clarify why certain aspects of the universe remain unobservable despite the ability to detect the cosmic microwave background (CMB) Some participants express confusion about
Spatial Curvature in Cosmological Models - Physics Forums The observable universe is the region from which light has had time to reach us since the Big Bang; it therefore has a finite radius and finite volume By contrast, the term universe in its broadest sense denotes all of physical space and may be much larger than the observable portion
The electron is not point-like? • Physics Forums Photons are not localized point-particle-like objects They do not even admit a position observable in the usual sense One has to forget about false pictures of 1905 (in the best of all world these false pictures wouldn't have been taught to students to begin with) Also photons cannot be understood with QM
How many cubic planck lengths are in the observable universe? If you take the size of the observable universe can you find out how many cubic plank lengths can fit in the observable universe and it doesn't have to be exact just approximation Also the math and formulas would be helpful too