PhysLean Documentation

PhysLean.Particles.SuperSymmetry.SU5.ChargeSpectrum.OfPotentialTerm

Charges associated with a potential term #

i. Overview #

In this module we give the multiset of charges associated with a given type of potential term, given a charge spectrum.

We will define two versions of this, one based on the underlying fields on the potentials, and the charges that they carry, and one more explicit version which is faster to compute with. The former is ofPotentialTerm, and the latter is ofPotentialTerm'.

We will show that these two multisets have the same elements.

ii. Key results #

iii. Table of contents #

iv. References #

There are no known references for this material.

A. Charges of a potential term from field labels #

We first define ofPotentialTerm, and prover properites of it. This is slow to compute in practice.

Given a charges x : Charges associated to the representations, and a potential term T, the charges associated with instances of that potential term.

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    A.1. Monotonicity of ofPotentialTerm #

    We show that ofPotentialTerm is monotone in its charge spectrum argument. That is if x ⊆ y then ofPotentialTerm x T ⊆ ofPotentialTerm y T.

    A.2. Charges of potential terms for the empty charge spectrum #

    For the empty charge spectrum, the charges associated with any potential term is empty.

    B. Explicit construction of charges of a potential term #

    We now turn to a more explicit construction of the charges associated with a potential term. This is faster to compute with, but less obviously connected to the underlying fields.

    Given a charges x : ChargeSpectrum associated to the representations, and a potential term T, the charges associated with instances of that potential term.

    This is a more explicit form of PotentialTerm, which has the benifit that it is quick with decide, but it is not defined based on more fundamental concepts, like ofPotentialTerm is.

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      B.1. Explicit multisets for ofPotentialTerm' #

      For each potential term, we give an explicit form of the multiset ofPotentialTerm'.

      theorem SuperSymmetry.SU5.ChargeSpectrum.ofPotentialTerm'_W2_finset {𝓩 : Type} [AddCommGroup 𝓩] {x : ChargeSpectrum 𝓩} :
      x.ofPotentialTerm' PotentialTerm.W2 = Multiset.map (fun (x : 𝓩 × 𝓩 × 𝓩 × 𝓩) => x.1 + x.2.1 + x.2.2.1 + x.2.2.2) (x.qHd.toFinset.product (x.Q10.product (x.Q10.product x.Q10))).val

      B.2. ofPotentialTerm' on the empty charge spectrum #

      We show that for the empty charge spectrum, the charges associated with any potential term is empty, as defined through ofPotentialTerm'.

      C. Relation between two constructions of charges of potential terms #

      We now give the relation between ofPotentialTerm and ofPotentialTerm'. We show that they have the same elements, by showing that they are subsets of each other.

      The prove of some of these results are rather long since they involve explicit case analysis for each potential term, due to the nature of the definition of ofPotentialTerm'.

      C.1. Showing that ofPotentialTerm is a subset of ofPotentialTerm' #

      We first show that ofPotentialTerm is a subset of ofPotentialTerm'.

      C.2. Showing that ofPotentialTerm' is a subset of ofPotentialTerm #

      We now show the other direction of the subset relation, that ofPotentialTerm' is a subset of ofPotentialTerm.

      C.3. Equivalence of elements of ofPotentialTerm and ofPotentialTerm' #

      We now show that a charge is in ofPotentialTerm if and only if it is in ofPotentialTerm'. I.e. their underlying finite sets are equal. We do not say anything about the multiplicity of elements within the multisets, which is not important for us.

      C.4. Induced monoticity of ofPotentialTerm' #

      Due to the equivalence of elements of ofPotentialTerm and ofPotentialTerm', we can now also show that ofPotentialTerm' is monotone in its charge spectrum argument.