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arXiv 0812.1459astro-ph
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暗能量的快子扰动引起的CMB各向异性

CMB anisotropy induced by tachyonic perturbations of dark energy

M. V. Libanov, V. A. Rubakov, O. S. Sazhina, M. V. Sazhin

摘要:

我们研究了可能的暗能量的快子扰动对CMB温度各向异性的影响。受幻影能量模型的启发,我们考虑了快子微扰的洛伦兹不变和洛伦兹破坏色散关系。我们表明,在洛伦兹破坏的情况下,由快子扰动产生的CMB各向异性谱的形状是非常不同的,由于绝热标量扰动,如果相当大的,它会直接从后者区分。快子的贡献略有改善的理论和数据之间的协议,但是,这种改善是不具有统计意义的,所以我们的分析结果的限制的时间尺度的快子不稳定性。在洛伦兹不变的情况下,快子的贡献是一个快速衰减的函数的多极数$l$,使整个观察到的偶极子可以产生不冲突的数据在更高的多极。在保守的一面,我们的比较与数据的地方限制的绝对值(虚)快子质量的洛伦兹不变的情况下。

英文摘要:

We study effects of possible tachyonic perturbations of dark energy on the CMB temperature anisotropy. Motivated by some models of phantom energy, we consider both Lorentz-invariant and Lorentz-violating dispersion relations for tachyonic perturbations. We show that in the Lorentz-violating case, the shape of the CMB anisotropy spectrum generated by the tachyonic perturbations is very different from that due to adiabatic scalar perturbations and, if sizeable, it would be straightforwardly distinguished from the latter. The tachyonic contribution improves slightly the agreement between the theory and data; however, this improvement is not statistically significant, so our analysis results in limits on the time scale of the tachyonic instability. In the Lorentz-invariant case, tachyonic contribution is a rapidly decaying function of the multipole number $l$, so that the entire observed dipole can be generated without conflicting the data at higher multipoles. On the conservative side, our comparison with the data places limit on the absolute value of the (imaginary) tachyon mass in the Lorentz-invariant case.

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