Talk detail

Participant	YANG, Xiaofeng
Institution	Xinjiang Astronomical Observatory, Chinese Academy of Sciences - 150 Science 1-Street - Urumqi, Xinjiang 830011, China - Xinjiang - China

Session	DE1	Accepted		Order	Time
Talk	Oral abstract	Title	Testing the isotropic expansion of the universe
Coauthors
Abstract	Type Ia supernovae (SNe Ia) played a central role in the discovery of the accelerated expansion of the Universe, recognized by the Nobel Prize in Physics in 2011.The last decade has seen an enormous increase in the amount of high quality SN observations, with SN catalogues now containing hundreds of objects. It should be the first option to employ SN Ia to investigate the detail of cosmic acceleration. However, gamma-ray bursts (GRBs) will be the good complement in higher redshift universe.The cosmological principle assumes that the universe is homogeneous and isotropic on a sufficiently large scale. In practice, the homogeneity and isotropy are confirmed by a variety of cosmological observations, such as CMB and its secondary effects, galaxy pairs and LSS. However, a cosmological preferred direction was reported from SNe Ia data in recent years. Thus, the main body of this talk includes several extensive studies of constraints on the isotropic expansion of the Universe from SNe Ia and GRBs. My results indicate that there is no any conclusive evidence for an anisotropic cosmological model.
Pdf file

Session	DE2	Accepted		Order	Time
Talk	Oral abstract	Title	Testing the isotropic expansion of the universe
Coauthors
Abstract	Type Ia supernovae (SNe Ia) played a central role in the discovery of the accelerated expansion of the Universe, recognized by the Nobel Prize in Physics in 2011.The last decade has seen an enormous increase in the amount of high quality SN observations, with SN catalogues now containing hundreds of objects. It should be the first option to employ SN Ia to investigate the detail of cosmic acceleration. However, gamma-ray bursts (GRBs) will be the good complement in higher redshift universe.The cosmological principle assumes that the universe is homogeneous and isotropic on a sufficiently large scale. In practice, the homogeneity and isotropy are confirmed by a variety of cosmological observations, such as CMB and its secondary effects, galaxy pairs and LSS. However, a cosmological preferred direction was reported from SNe Ia data in recent years. Thus, the main body of this talk includes several extensive studies of constraints on the isotropic expansion of the Universe from SNe Ia and GRBs. Our results indicate that there is no any conclusive evidence for an anisotropic cosmological model.
Pdf file