# What is Susy: Definition and 115 Discussions

Susy is a feminine given name, sometimes a short form (hypocorism) of Susan, Susanne, Susannah, etc.

Susy may refer to:

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1. ### I Lecture notes on SUSY using finite matrix as example?

As you know, a lot of SUSY examples, particularly from Witten's "SUSY QM", pivot on the factorisation trick: produce two hamiltonians $$H_0=AA^+, H_1=A^+A$$ and see they have the same eigenvalues except for ceros. The proof usually goes by: let ##\Psi## be an eigenvector of ##H_0##, consider...
2. ### I Antimatter Susy Sparticles: Exploring Symmetry

In supersymmetry, are there corresponding antimatter particles to the Susy sparticles similar to the corresponding standard model antimatter particles, e.g., antiselectron, etc.?
3. ### I Is SUSY still a possibility with current EDM limits and energy constraints?

Hello! I am really not an expert in this so please correct me if I say something stupid. I read a few articles (e.g. https://journals.aps.org/rmp/pdf/10.1103/RevModPhys.90.025008) in which there are presented the implications of low energy physics on high energy physics. In the electric dipole...
4. ### Simplified SUSY models with different mixing cases

Hi Probably a bit technical, but here it is. I am trying to construct some simplfied SUSY models (that is, you only tune the masses of the core process, while all the rest are decoupled), and I would like to play with different mixing scenarios for the neutralino and charginos, so to get a...

41. ### Understanding BPS States and Their Relation to Supersymmetry Generators

A quick and simple question: one always talks about BPS states annihilating half the supercharges. What does that mean exactly? For example, in a pedagogical article by Alvarez-Gaumé and Hassan they give the anticommutator of one set of supercharges to be \{b_\alpha, b_\beta^\dagger \} =...
42. ### Why in SUSY we tend to use 2- components

Hi all, why in SUSY we tend to use 2- components Weyl spinor field not the ordinary Dirac filed .. Regards, Safinaz
43. ### AsymSafe QG rejects SUSY & extra dims (Donà Eichhorn Percacci)

Percacci and friends have found incompatibility between Asymptotically Safe quantum gravity on the one hand and, on the other, extensions of the Standard Model which involve supersymmetry and/or extra dimensions. If evidence for supersymmetry or extra dimensions ever shows up that would tend...
44. ### On SUSY irreps: eigenvalues of Pauli-Lubanski operator?

Hi everyone, Just an easy question that came to my mind while studying basics of SUSY. Consider in N=1, D=4 a massive clifford vacuum |m,s,s_3\rangle, and for cconcreteness take its spin to be s=1/2. Now, acting with the four supercharges on both the |m,1/2,1/2\rangle and |m,1/2,-1/2\rangle...
45. ### What is the expression of N=2 SUSY transformation

I have checked many textbooks and papers on SUSY and it seems that none of them mentions anything about the infinitesimal susy transformation on component fields in the case N\neq 1. So I am wondering what does it looks like, say for N=2 vector multiplet? Another related question is, do we need...
46. ### Infinitesimal SUSY transformation of SYM lagrangian

I tried to verify that the SYM lagrangian is invariant under SUSY transformation, but it turned out there is a term that doesn't vanish. The SYM lagrangian is: \mathscr{L}_{SYM}=-\frac{1}{4}F^{a\mu\nu}F^a_{\mu\nu}+i\lambda^{\dagger a}\bar{\sigma}^\mu D_\mu \lambda^a+\frac{1}{2}D^a D^a the...
47. ### Questions about N=1 SUSY and Magnetic Monopoles

For N=1 SUSY, the SUSY algebra is closed as long as Bianchi identity \epsilon^{\mu\nu\rho\sigma}D_\nu F^a_{\rho\sigma}=0 is valid, that is [\delta_{\epsilon_1},\delta_{\epsilon_2}] \propto P . What if there is magnetic monopole when Bianchi identity doesn't hold? When N=2, there is central...
48. ### Supergravity = local SUSY or gravity mediation?

Hi, in some texts, the term supergravity refers to locallized supersymmetry but most of the times, I have the impression that it refers to gravity mediated supersymmetry breaking (i.e. higher dimensional terms in the kahler- and superpotential that are suppressed by powers of the Planck...
49. ### Usefulness of SUSY models when it cant exist at non-zero temperatures

Unlike other symmetries (like electroweak symmetry), SUSY is spontaneously broken at any non-zero temperature due to some variation of the fact that the boundary conditions on bosons and fermions in thermal QFT are different. If this is the case, what is the rationale for considering SUSY...
50. ### Susy preserving branes and equation of motion

Hello, I've thought about it a few times and this question interests me. If a brane (M2 in my case) in euclidean signature preserves some supersymmetry, does it automatically solve the equation of motion? In order to be more precise here is what I mean: Take 11D SUGRA with an AdS_4xS^7...