scholarly journals Gamma-ray bursts: cosmic rulers for the high-redshift universe?

2007 ◽  
Vol 365 (1854) ◽  
pp. 1395-1397 ◽  
Author(s):  
Fiona C Speirits ◽  
Martin A Hendry ◽  
Alejandro Gonzalez
Keyword(s):  
Gamma Ray ◽  
High Redshift ◽  
Current Data ◽  
Gamma Ray Bursts ◽  
Luminosity Distance ◽  
Conformal Gravity ◽  
Hubble Diagram ◽  
Cosmological Distance Scale ◽  
Standard Candle ◽  
High Redshift Universe

The desire to extend the Hubble Diagram to higher redshifts than the range of current Type 1a Supernovae observations has prompted investigation into spectral correlations in gamma-ray bursts (GBRs), in the hope that standard candle-like properties can be identified. In this paper, we discuss the potential of these new ‘cosmic rulers’ and highlight their limitations by investigating the constraints that current data can place on an alternative Cosmological model in the form of Conformal Gravity. By fitting current Type 1a Supernovae and GRB data to the predicted luminosity distance redshift relation of both the standard Concordance Model and the Conformal Gravity, we show that currently neither model is strongly favoured at high redshift. The scatter in the current GRB data testifies to the further work required if GRBs are to cement their place as effective probes of the cosmological distance scale.

scholarly journals Gamma‐Ray Bursts as a Probe of the Very High Redshift Universe

2000 ◽  
Vol 536 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Donald Q. Lamb ◽  
Daniel E. Reichart
Keyword(s):  
Gamma Ray ◽  
High Redshift ◽  
Gamma Ray Bursts ◽  
High Redshift Universe ◽  
Very High

ANGULAR TWO-POINT CORRELATION FUNCTIONS FOR COSMOLOGICAL GAMMA-RAY BURST MODEL

1995 ◽  
Vol 04 (02) ◽  
pp. 219-230
Author(s):  
SHIHO KOBAYASHI ◽  
SHIN SASAKI ◽  
YASUSHI SUTO
Keyword(s):  
Correlation Functions ◽  
Gamma Ray ◽  
High Redshift ◽  
Current Data ◽  
Gamma Ray Bursts ◽  
Spatial Correlations ◽  
Gamma Ray Burst ◽  
Angular Correlations ◽  
Observatory Data ◽  
Point Correlation

We compute the angular two-point correlation functions of the gamma-ray bursts at cosmological distances. Since the gamma-ray burst emission mechanism is not yet established, we simply assume that the gamma-ray burst sources are associated with high-redshift galaxies in some way. Then on the basis of several simple models for the evolution of galaxy spatial correlations, we calculate the amplitude of angular two-point correlation functions on scales appropriate for the Compton Gamma Ray Observatory data. We find that in most cases the predicted correlations are difficult to detect with the current data rate and the angular resolution, but models in which the bursts preferentially occur at relatively low redshift (z≲0.5) predict correlation amplitudes on θ~5° which will be marginally detectable with the Gamma Ray Observatory data in several years. If future observations detect a signal of angular correlations, it will imply useful information on the correlation of galaxies at high redshifts provided that the gamma-ray bursts are cosmological.

scholarly journals Observing the First Stars, One Star at a Time

2005 ◽  
Vol 192 ◽  
pp. 543-553
Author(s):  
Abraham Loeb
Keyword(s):  
Black Holes ◽  
Neutron Stars ◽  
Gamma Ray ◽  
Massive Stars ◽  
High Redshift ◽  
Gamma Ray Bursts ◽  
First Stars ◽  
New Era ◽  
The Many ◽  
High Redshift Universe

SummaryGamma-Ray Bursts (GRBs) are believed to originate in compact remnants (black holes or neutron stars) of massive stars. Their high luminosities make them detectable out to the edge of the visible universe. We describe the many advantages of GRB afterglows relative to quasars as probes of the intergalactic medium during the epoch of reionization. The Swift satellite, planned for launch by the end of 2004, will likely open a new era in observations of the high redshift universe.

scholarly journals Exploring the potentiality of standard sirens to probe cosmic opacity at high redshifts

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Xiangyun Fu ◽  
Jianfei Yang ◽  
Zhaoxia Chen ◽  
Lu Zhou ◽  
Jun Chen
Keyword(s):  
Gamma Ray ◽  
High Redshift ◽  
Gamma Ray Bursts ◽  
Type Ia Supernovae ◽  
Luminosity Distance ◽  
Spatial Homogeneity ◽  
Einstein Telescope ◽  
The Future ◽  
Type Ia ◽  
Ia Supernovae

AbstractIn this work, using the Gaussian process, we explore the potentiality of future gravitational wave (GW) measurements to probe cosmic opacity at high redshifts through comparing its opacity-free luminosity distance (LD) with the opacity-dependent one from the combination of Type Ia supernovae (SNIa) and gamma-ray bursts (GRBs). The GW data, SNIa and GRB data are simulated from the measurements of the future Einstein Telescope, the actual Pantheon compilation and the latest observation of GRBs compiled by Amati et al, respectively. A nonparametric method is proposed to probe the spatial homogeneity of cosmic transparency at high redshift by comparing the LD reconstructed from the GW data with that reconstructed from the Pantheon and GRB data. In addition, the cosmic opacity is tested by using the parametrization for the optical depth, and the results show that the constraints on cosmic opacity are more stringent than the previous ones. It shows that the future GW measurements may be used as an important tool to probe the cosmic opacity in the high redshift region.

scholarly journals CALIBRATION OF GRB LUMINOSITY RELATIONS WITH COSMOGRAPHY

2012 ◽  
Vol 21 (02) ◽  
pp. 1250016 ◽  
Author(s):  
HE GAO ◽  
NAN LIANG ◽  
ZONG-HONG ZHU
Keyword(s):  
Gamma Ray ◽  
Background Radiation ◽  
Interpolation Method ◽  
High Redshift ◽  
Confidence Region ◽  
Acoustic Oscillation ◽  
Current Data ◽  
Observation Data ◽  
Luminosity Distance ◽  
Microwave Background Radiation

For the use of gamma-ray bursts (GRBs) to probe cosmology in a cosmology-independent way, a new method has been proposed to obtain luminosity distances of GRBs by interpolating directly from the Hubble diagram of SNe Ia, and then calibrating GRB relations at high redshift. In this paper, following the basic assumption in the interpolation method that objects at the same redshift should have the same luminosity distance, we propose another approach to calibrate GRB luminosity relations with cosmographic fitting directly from SN Ia data. In cosmography, there is a well-known fitting formula which can reflect the Hubble relation between luminosity distance and redshift with cosmographic parameters which can be fitted from observation data. Using the Cosmographic fitting results from the Union set of SNe Ia, we calibrate five GRB relations using GRB sample at z ≤ 1.4 and deduce distance moduli of GRBs at 1.4 < z ≤ 6.6 by generalizing above calibrated relations at high redshift. Finally, we constrain the dark energy parameterization models of the Chevallier–Polarski–Linder (CPL) model, the Jassal–Bagla–Padmanabhan (JBP) model and the Alam model with GRB data at high redshift, as well as with the cosmic microwave background radiation (CMB) and the baryonic acoustic oscillation (BAO) observations, and we find the ΛCDM model is consistent with the current data in 1-σ confidence region.

scholarly journals Tension with the flat ΛCDM model from a high-redshift Hubble diagram of supernovae, quasars, and gamma-ray bursts

2019 ◽  
Vol 628 ◽  
pp. L4 ◽  
Author(s):  
E. Lusso ◽  
E. Piedipalumbo ◽  
G. Risaliti ◽  
M. Paolillo ◽  
S. Bisogni ◽  
...  
Keyword(s):  
Cold Dark Matter ◽  
Gamma Ray ◽  
High Redshift ◽  
Cosmological Parameters ◽  
New Physics ◽  
Gamma Ray Bursts ◽  
Hubble Diagram ◽  
Data Set ◽  
Λcdm Model ◽  
Model Independent

In the current framework, the standard parametrization of our Universe is the so-called Lambda cold dark matter (ΛCDM) model. Recently, a ∼4σ tension with the ΛCDM model was shown to exist via a model-independent parametrization of a Hubble diagram of type Ia supernovae (SNe Ia) from the JLA survey and quasars. Model-independent approaches and independent samples over a wide redshift range are key to testing this tension and any possible systematic errors. Here we present an analysis of a combined Hubble diagram of SNe Ia, quasars, and gamma-ray bursts (GRBs) to check the agreement of the quasar and GRB cosmological parameters at high redshifts (z >  2) and to test the concordance flat ΛCDM model with improved statistical accuracy. We build a Hubble diagram with SNe Ia, quasars, and GRBs, where quasars are standardised through the observed non-linear relation between their ultraviolet and X-ray emission and GRBs through the correlation between the spectral peak energy and the isotropic-equivalent radiated energy (the so-called Amati relation). We fit the data with cosmographic models consisting of a fourth-order logarithmic polynomial and a fifth-order linear polynomial, and compare the results with the expectations from a flat ΛCDM model. We confirm the tension between the best-fit cosmographic parameters and the ΛCDM model at ∼4σ with SNe Ia and quasars, at ∼2σ with SNe Ia and GRBs, and at > 4σ with the whole SNe Ia+quasars+GRB data set. The completely independent high-redshift Hubble diagrams of quasars and GRBs are fully consistent with each other, strongly suggesting that the deviation from the standard model is not due to unknown systematic effects but to new physics.

Sign in / Sign up

Export Citation Format

Share Document