Brane SUSY Breaking and the Gravitino Mass

Abstract

Supergravity models with spontaneously broken supersymmetry have been widely investigated over the years, together with some notable non-linear limits. Although in these models the gravitino becomes naturally massive absorbing the degrees of freedom of a Nambu-Goldstone fermion, there are cases in which the naive counting of degrees of freedom does not apply, in particular because of the absence of explicit gravitino mass terms in unitary gauge. The corresponding models require non-trivial de Sitter-like backgrounds, and it becomes of interest to clarify the fate of their Nambu-Goldstone modes. We elaborate on the fact that these non-trivial backgrounds can accommodate, consistently, gravitino fields carrying a number of degrees of freedom that is intermediate between those of massless and massive fields in a flat spacetime. For instance, in a simple supergravity model of this type with de Sitter background, the overall degrees of freedom of gravitino are as many as for a massive spin-3/2 field in flat spacetime, while the gravitino remains massless in the sense that it undergoes null-cone propagation in the stereographic picture. On the other hand, in the ten-dimensional USp(32) Type I Sugimoto model with "brane SUSY breaking", which requires a more complicated background, the degrees of freedom of gravitino are half as many of those of a massive one, and yet it somehow behaves again as a massless one.

18 pages

References in corpus (17)

• From Linear SUSY to Constrained Superfields
• Partially Massless Fields During Inflation
• On the Inflationary Perturbations of Massive Higher-Spin Fields
• Relating the Komargodski-Seiberg and Akulov-Volkov actions: Exact nonlinear field redefinition
• Just enough inflation: power spectrum modifications at large scales
• On Climbing Scalars in String Theory
• The CMB Quadrupole depression produced by early fast-roll inflation: MCMC analysis of WMAP and SDSS data
• CMB quadrupole suppression: II. The early fast roll stage
• The Goldstino Brane, the Constrained Superfields and Matter in N=1 Supergravity
• Imprints of Spinning Particles on Primordial Cosmological Perturbations
• Detecting higher spin fields through statistical anisotropy in the CMB and galaxy power spectra
• ${\varphi }^4$ inflation is not excluded
• Mass Formulae for Broken Supersymmetry in Curved Space-Time
• Quantum Gravity and the Large Scale Anomaly
• An Update on Brane Supersymmetry Breaking
• Quantum slow-roll and quantum fast-roll inflationary initial conditions: CMB quadrupole suppression and further effects on the low CMB multipoles
• The Evens and Odds of CMB Anomalies

Cited by in corpus (11)

• On Classical Stability with Broken Supersymmetry
• Brane annihilation in non-supersymmetric strings
• The supersymmetric anti-D3-brane action in KKLT
• On Warped String Vacuum Profiles and Cosmologies, II. Non-Supersymmetric Strings
• Supersymmetry Breaking and Stability in String Vacua: brane dynamics, bubbles and the swampland
• On Warped String Vacuum Profiles and Cosmologies, I. Supersymmetric Strngs
• Non-supersymmetric String Models from Anti-D3-/D7-branes in Strongly Warped Throats
• On Boundaries, Charges and Fermi Fields
• The signatures of the new particles $h_2$ and $Z_{\mu \tau }$ at e-p colliders in the $U(1{)}_{L_{\mu }-L_{\tau }}$ model
• On All-Order Higher-Point $\text{D}p$-$\overline{\text{D}p}$ Effective Actions
• String (In)Stability Issues with Broken Supersymmetry