暗能量和宇宙学CPT破坏.ppt

暗能量和宇宙学CPT破坏 李明哲 南京大学物理系 粒子-核-宇宙学联合研究中心 Outline 1, Brief review on dark energy models, cosmological constant or dynamical dark energy, current status 2, Interacting dark energy: direct coupling: propagates long range force, spoils the flatness of the potential of dark energy derivative coupling: spin-dependent force, shift symmetry, guarantee the flatness of the potential, cosmological CPT violation 3, Model: Interacting Dark Energy The Model Observation of cosmological CPT violation through CMB experiments WMAP3 only 1) 2) 3) 6) Bo Feng et al., PRL 96, 221302 (2006) J.Q.Xia et al., arXiv:0710.3325 5) J.Q.Xia et al., arXiv:0803.2350 4) (WMAP Group) Komatsu et al., arXiv:0803.0547 WMAP5 only J.Q.Xia et al., arXiv:0710.3325 P.Cabella, Natoli Silk, PRD (2007) Spatial dependent rotation angle: Mingzhe Li Xinmin Zhang, PRD(2008) This is the direct consequence of invariance of under the rotation Only the background evolution of dark energy provides CPT violation! The corrections are at the order of In the quintessence model with tracking potential, By assuming the initial fluctuation of quintessence generated from a GUT scale inflation Constraining a spatially dependent rotation of the Cosmic Microwave Background Polarization.Yadav, Biswas, Su, Zaldarriaga,arXiv:0902.4466 How to De-Rotate the Cosmic Microwave Background Polarization.M. Kamionkowski, PRL(2009), arXiv:0810.1286 Detection of Spatially Dependent Rotation Angle Conclusion Dynamical dark energy has possible couplings besides gravity to other matter. Direct couplings are constrained tightly. Derivative couplings are more likely. The derivative couplings violate CPT cosmologically and can explain the matter-antimatter asymmetry. Our model of leptogenesis predicts CPT violation in the photon sector. It can be tested by CMB, current data favored nonzero rotation angle mildly. The rotation angle is anisotropic in general. More studies in the future. Thanks! Date: Wed, 8 Oct 2008