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经典宇宙学模型中的伽玛暴哈勃图

The GRBs Hubble diagram in quintessential cosmological models

Marek Demianski, Ester Piedipalumbo, Claudio Rubano

摘要:

最近的经验研究表明,伽玛暴的某些直接观测参数与其重要的内禀参数(如亮度或总辐射能量)有关。这些相关性被导出、测试并用于标准化伽玛暴,即,从一个或多个可观测量中导出它们的光度或辐射能量,以便构建一个估计的基准哈勃图,假设辐射在标准的LambdaCDM宇宙学模型中传播。我们通过考虑更一般的暗能量模型和更新的高红移伽玛暴数据集来扩展这些分析。我们表明,相关参数只有弱依赖于宇宙模型。此外,我们应用局部回归技术以模型独立的方式估计最近更新的包含307个SNIa的SNIa样本的距离模量(Astier et al. 2006),以便校准GRB的2D相关性,仅考虑z <1.4的GRB。导出的校准参数被用来构建一个新的伽玛暴哈勃图,我们称之为校准伽玛暴HD。我们还比较了估计和校准的伽玛暴HD。事实证明,对于常见的伽玛暴,它们在统计上完全一致,从而表明它们都不受不同标准化程序引起的任何系统偏差的影响。最后,我们应用我们的方法来校准95个长伽玛暴与著名的Amati关系和构建的估计和校准的伽玛暴哈勃图,扩展到红移z ~ 8。即使在这种情况下,这些数据集之间也存在一致性。这意味着高红移伽玛暴可以用来测试不同的暗能量模型。我们用校准过的伽玛暴HD来约束我们的经典宇宙学模型,并导出了Omega_m和w(0)的似然值。

英文摘要:

It has been recently empirically established that some of the directly observed pa- rameters of GRBs are correlated with their important intrinsic parameters, like the luminosity or the total radiated energy. These correlations were derived, tested and used to standardize GRBs, i.e., to derive their luminosity or radiated energy from one or more observables, in order to construct an estimated fiducial Hubble diagram, assuming that radiation propagates in the standard LambdaCDM cosmological model. We extend these analyses by considering more general models of dark energy, and an updated data set of high redshift GRBs. We show that the correlation parameters only weakly depend on the cosmological model. Moreover we apply a local regression technique to estimate, in a model independent way, the distance modulus from the recently updated SNIa sample containing 307 SNIa (Astier et al. 2006), in order to calibrate the GRBs 2D correlations, considering only GRBs with z <1.4. The derived calibration parameters are used to construct a new GRBs Hubble diagram, which we call the calibrated GRBs HD. We also compare the estimated and calibrated GRBs HDs. It turns out that for the common GRBs they are fully statistically consistent, thus indicating that both of them are not affected by any systematic bias induced by the different standardizing procedures. We finally apply our methods to calibrate 95 long GRBs with the well-known Amati relation and construct the estimated and calibrated GRBs Hubble diagram that extends to redshifts z ~ 8. Even in this case there is consistency between these datasets. This means that the high redshift GRBs can be used to test different models of dark energy. We used the calibrated GRBs HD to constrain our quintessential cosmological model and derived the likelihood values of Omega_m and w(0).

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