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A COMPREHENSIVE ANALYSIS OF FERMI GAMMA-RAY BURST DATA. II. Ep EVOLUTION PATTERNS AND IMPLICATIONS FOR THE OBSERVED SPECTRUM–LUMINOSITY RELATIONS

We present a time-resolved spectral analysis of 51 long and 11 short bright gamma-ray bursts (GRBs) observed with the Fermi/Gamma-Ray Burst Monitor, paying special attention to Ep evolution within…
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SELECTION EFFECTS ON THE OBSERVED REDSHIFT DEPENDENCE OF GAMMA-RAY BURST JET OPENING ANGLES

An apparent redshift dependence of the jet opening angles (θj) of gamma-ray bursts (GRBs) is observed from the current GRB sample. We investigate whether this dependence can be explained with…
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Testing Einstein's Equivalence Principle With Fast Radio Bursts.

It is proved that fast radio bursts (FRBs) of cosmological origin can be used to constrain the EEP with high accuracy, and a strict upper limit on the differences of the parametrized post-Newtonian parameter γ values is obtained.
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An Improved Method to Measure the Cosmic Curvature

In this paper, we propose an improved model-independent method to constrain the cosmic curvature by combining the most recent Hubble parameter H(z) and supernovae Ia (SNe Ia) data. Based on the H(z)…
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A New Test of Lorentz Invariance Violation: The Spectral Lag Transition of GRB 160625B

Possible violations of Lorentz invariance (LIV) have been investigated for a long time using the observed spectral lags of gamma-ray bursts (GRBs). However, these generally have relied on using a…
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Model-independent Curvature Determination from Gravitational-wave Standard Sirens and Cosmic Chronometers

The detection of gravitational waves (GWs) provides a direct way to measure the luminosity distance, which enables us to probe cosmology. In this paper, we continue to expand the application of GW…
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A COMPARATIVE ANALYSIS OF THE SUPERNOVA LEGACY SURVEY SAMPLE WITH ΛCDM AND THE Rh=ct UNIVERSE

The use of Type Ia supernovae (SNe Ia) has thus far produced the most reliable measurement of the expansion history of the universe, suggesting that ΛCDM offers the best explanation for the…
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Model-independent Constraints on Cosmic Curvature and Opacity

In this paper, we propose to estimate the spatial curvature of the universe and the cosmic opacity in a model-independent way with expansion rate measurements, H(z), and type Ia supernova (SNe Ia).…
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Cosmology-independent Estimate of the Fraction of Baryon Mass in the IGM from Fast Radio Burst Observations

The excessive dispersion measure (DM) of fast radio bursts (FRBs) has been proposed to be a powerful tool to study intergalactic medium (IGM) and to perform cosmography. One issue is that the…
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Model-independent Distance Calibration and Curvature Measurement Using Quasars and Cosmic Chronometers

We present a new model-independent method to determine spatial curvature and to mitigate the circularity problem affecting the use of quasars as distance indicators. Cosmic-chronometer measurements…
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