Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gamma Ray Bursts: Cosmic Rulers for the High-Redshift Universe?   The desire to extend the Hubble Diagram to higher redshifts than the range of
current Type Ia Supernovae observations has prompted investigation into
spectral correlations in Gamma Ray Bursts, 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 Gamma Ray Burst (GRB) data to the predicted luminosity distance
redshift relation of both the standard Concordance Model and Conformal Gravity,
we show that currently \emph{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.

20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex