Autor: Singal, Jack - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: On the intrinsic nature of the updated luminosity time correlation in the X-ray afterglows of GRBs
Autorzy:: Petrosian, Vahe'
Dainotti, Maria
Singal, Jack
Wydawca:: Cambridge University Press
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Determination of the intrinsic luminosity time correlation in the X-ray afterglows of gamma-ray bursts
Autorzy:: Petrosian, Vahe'
Singal, Jack
Dainotti, Maria
Ostrowski, Michał
Opis:: Gamma-ray bursts (GRBs), which have been observed up to redshifts $\mathit{z} \approx 9.5$, can be good probes of the early universe and have the potential to test cosmological models. Dainotti’s analysis of GRB Swift afterglow light curves with known redshifts and a definite X-ray plateau shows an anti-correlation between the rest-frame time when the plateau ends (the plateau end time) and the calculated luminosity at that time (or approximately an anti-correlation between plateau duration and luminosity). Here, we present an update of this correlation with a larger data sample of 101 GRBs with good light curves. Since some of this correlation could result from the redshift dependences of these intrinsic parameters, namely, their cosmological evolution, we use the Efron–Petrosian method to reveal the intrinsic nature of this correlation. We find that a substantial part of the correlation is intrinsic and describe how we recover it and how this can be used to constrain physical models of the plateau emission, the origin of which is still unknown. The present result could help to clarify the debated nature of the plateau emission.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Opis:: The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades. This concordance model is constructed by a universal cosmological constant and supported by a matter sector described by the standard model of particle physics and a cold dark matter contribution, as well as very early-time inflationary physics, and underpinned by gravitation through general relativity. There have always been open questions about the soundness of the foundations of the standard model. However, recent years have shown that there may also be questions from the observational sector with the emergence of differences between certain cosmological probes. In this White Paper, we identify the key objectives that need to be addressed over the coming decade together with the core science projects that aim to meet these challenges. These discordances primarily rest on the divergence in the measurement of core cosmological parameters with varying levels of statistical confidence. These possible statistical tensions may be partially accounted for by systematics in various measurements or cosmological probes but there is also a growing indication of potential new physics beyond the standard model. After reviewing the principal probes used in the measurement of cosmological parameters, as well as potential systematics, we discuss the most promising array of potential new physics that may be observable in upcoming surveys. We also discuss the growing set of novel data analysis approaches that go beyond traditional methods to test physical models. These new methods will become increasingly important in the coming years as the volume of survey data continues to increase, and as the degeneracy between predictions of different physical models grows. There are several perspectives on the divergences between the values of cosmological parameters, such as the model-independent probes in the late Universe and model-dependent measurements in the early Universe, which we cover at length. The White Paper closes with a number of recommendations for the community to focus on for the upcoming decade of observational cosmology, statistical data analysis, and fundamental physics developments.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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