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arXiv 1502.07627hep-thhep-ph
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$\overline{\rm D3}$和dS

$\overline{\rm D3}$ and dS

Eric A. Bergshoeff, Keshav Dasgupta, Renata Kallosh, Antoine Van Proeyen, Timm Wrase

摘要:

的作用,$\overline{\rm D3}$膜在提供德西特真空自发破缺的超对称性的KKLT建设澄清。在arXiv:hep-th/0301240,arXiv:hep-th/0308055中解释了这个方向的第一步:在GKP背景中,DBI和WZ项对真空能量的玻色子贡献在D3膜上抵消,但在$\overline{\rm D3}$膜上加倍,导致德西特真空。下一步是在arXiv:1411.1121中,在平坦的超重力背景下,在存在生活在膜上的Al-Akulov-Akulov费米子的情况下,发现了$\overline{\rm D3}$(D3)DBI和WZ项的加倍(抵消)的类似机制。在这里,我们证实了这种机制的加倍/取消的$\overline{\rm D3}$ /D3膜在GKP超重力背景保持$\mathcal{N}=1$,$d=4$超对称性。我们发现,$(2,1)$型的虚自对偶$G_{(3)}$通量很好地去除了$SU(3)$费米子三重态,使其具有大质量,而留下无质量的$SU(3)$单线态。这使得D膜物理学中的德西特景观与具有幂零多重态和自发破缺超对称性的有效$d=4$超引力中的德西特真空有着明显的联系。

英文摘要:

The role of the $\overline{\rm D3}$ brane in providing de Sitter vacua with spontaneously broken supersymmetry in the KKLT construction is clarified. The first step in this direction was explained in arXiv:hep-th/0301240, arXiv:hep-th/0308055: it was shown there that in the GKP background the bosonic contributions to the vacuum energy from the DBI and WZ term cancel for a D3 brane, but double for a $\overline{\rm D3}$ brane, leading to de Sitter vacua. The next step was taken in arXiv:1411.1121 where the analogous mechanism of the doubling (cancelation) of the $\overline{\rm D3}$ (D3) DBI and WZ terms was discovered in the presence of Volkov-Akulov fermions living on the brane, in a flat supergravity background. Here we confirm this mechanism of doubling/cancelation for the $\overline{\rm D3}$/D3 brane in the GKP supergravity background preserving $\mathcal{N}=1$, $d=4$ supersymmetry. We find that imaginary self-dual $G_{(3)}$ flux of type $(2,1)$ nicely removes the $SU(3)$ fermion triplet by giving it a large mass, while leaving the Volkov-Akulov goldstino, which is the $SU(3)$ singlet, massless. This makes the de Sitter landscape in D-brane physics clearly related to de Sitter vacua in effective $d=4$ supergravity with a nilpotent multiplet and spontaneously broken supersymmetry.

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