报告题目:Can dark energy be presented in terms of the deceleration parameter?

报告人：Martiros Khurshudyan 博士

报告时间：上午10:00-11:00

报告地点：理学楼A110

Martiros Khurshudyan 博士学术报告

报告题目： Can dark energy be presented in terms of the deceleration parameter?
报告时间： 2019年6月25日上午10:00-11:00
报告地点： 理学楼A110

报告摘要：To explain the accelerated expansion of the Universe we need to introduce dark energy if at the same time General Relativity is assumed to describe the background dynamics. On the other hand, what is the exact nature of it still remains unanswered giving a room for many viable models to live there. Of course, several tools had been developed to distinguish the models, which solves the problem partially, demonstrating which of the models is preferable. However, the fundamental aspects concerning the true nature of dark energy still are in deep darkness. During this talk, a new parametrization of dark energy will be presented indicating the motivation behind it. In particular, we will discuss dark energy model which has been presented in terms of deceleration parameter. In other words a new dark energy model having a geometrical origin will be discussed. After the discussion of some aspects concerning the background dynamics, we will briefly address the solutions of the cosmological coincidence problem observed during the phase space analysis. Some hints towards future work also will be discussed. The model has been analysed using Gausian Processes as well.

报告人简介：

Martiros Khurshudyan, male, was born in Yerevan, Armenia on 21 April 1985. In 2008, he obtained a bachelor degree in theoretical physics from Yerevan State University, Armenia. In 2010, he obtained a master degree in theoretical physics from Yerevan State University. In 2017 he obtained his PhD in theoretical physics from Tomsk State University, Tomsk, Russia.

Since 2008 September Dr. Martiros Khurshudyan was working as a researcher on cosmology and astrophysics at different institutions in Italy, Germany, France, Poland, Russia, and Armenia. He got Marie Curie and Banach research fellowships for the research in Italy and Poland, respectively. Recently he got HAYKYAN award from the president of Armenia for his contribution in cosmology and astrophysics. He also got several grants from the government of Armenia during his early research career.

He is the author of more than 50 papers in cosmology addressing different problems of the filed, being in a collaboration with different groups in Italy, Spain, Japan, Norway and Russia.

Thanks to the "Chinese Academy of Sciences Presidents International Fellowship Initiative Grant" he joined the University of Science and Technology of China in April 2018 for the second postdoc term. The first postdoc he had immediately after the PhD defence at TUSUR, Tomsk, Russia.

He continues his research in cosmology and astrophysics at the Department of Astronomy at the University of Science and Technology of China.

欢迎感兴趣的老师和同学参加。