| 报告题目： |
Large Scale Lorentz Violation Gravity and Dark Energy |
| 报告人： |
薛迅 教授 |
| 报告人单位： |
华东师范大学 |
| 报告时间： |
2018年5月8日上午 09：00-11:00 |
| 报告地点： |
东七楼，四楼427会议室 |
| 邀请单位： |
粒子与天体物理研究所 |
| 报告摘要： |
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|
The accelerating expansion of universe can be described by the non-zero cosmological constant or the dark energy. However, the origin of the dark energy remains a mysteryof modern physics. The local Lorentz invariance is the most exact symmetry of the Nature on the one hand, but all quantum gravity theories predict Lorentz violation on the other hand. The local Lorentz violation induced by the quantum gravity at the very early universe may be transformed into large scale by inflation. Combining the low-$l$ anomalies of the CMB spectrum, we propose that the local Lorentz invariance may be broken at the large scale. We construct the effective gravity at the cosmic scale with a local $SO(3)$ symmetry. The theory exhibits non-trivial contortion distribution even with scalar matter source. The FRW like solution of the theory is analyzed and the contortion distribution contributes a dark energy like effect which isresponsible for the accelerating expansion of the universe. It reveals that the dark energy may be the remnants of quantum gravity in this sense. |
| 报告人简介： |
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薛迅，华东师范大学教授 。 |
