Title: Definitive Test of the R_h=ct Universe Using Redshift Drift Show Chinese title

Title: R_h=ct宇宙的确定性测试使用红移漂移

Abstract: The redshift drift of objects moving in the Hubble flow has been proposed as a powerful model-independent probe of the underlying cosmology. A measurement of the first and second order redshift derivatives appears to be well within the reach of upcoming surveys using ELT-HIRES and the SKA Phase 2 array. Here we show that an unambiguous prediction of the R_h=ct cosmology is zero drift at all redshifts, contrasting sharply with all other models in which the expansion rate is variable. For example, multi-year monitoring of sources at redshift z=5 with the ELT-HIRES is expected to show a velocity shift Delta v = -15 cm/s/yr due to the redshift drift in Planck LCDM, while Delta v=0 cm/s/yr in R_h=ct. With an anticipated ELT-HIRES measurement error of +/-5 cm/s/yr after 5 years, these upcoming redshift drift measurements might therefore be able to differentiate between R_h=ct and Planck LCDM at ~3 sigma, assuming that any possible source evolution is well understood. Such a result would provide the strongest evidence yet in favour of the R_h=ct cosmology. With a 20-year baseline, these observations could favor one of these models over the other at better than 5 sigma. Show Chinese abstract

Abstract: 宇宙物体在哈勃流中运动的红移漂移已被提出作为一种强大的模型无关的探测基础宇宙学的手段。 使用ELT-HIRES和SKA第二阶段阵列，对一阶和二阶红移导数的测量似乎完全在即将进行的调查范围内。 在这里，我们表明R_h=ct宇宙学的一个明确预测是在所有红移下漂移为零，这与其他膨胀率可变的模型形成鲜明对比。 例如，使用ELT-HIRES对红移z=5的源进行多年监测，预计在Planck LCDM中由于红移漂移会导致速度变化Delta v = -15 cm/s/yr，而在R_h=ct中Delta v=0 cm/s/yr。 预计ELT-HIRES在5年后的测量误差为 +/-5 cm/s/yr，因此这些即将进行的红移漂移测量可能能够在约3 sigma的水平上区分R_h=ct和Planck LCDM，假设任何可能的源演化都已很好地理解。 这样的结果将提供迄今为止最有力的证据支持R_h=ct宇宙学。 如果拥有20年的基线，这些观测可能会在超过5 sigma的水平上更倾向于其中一个模型。