Welcome to the homepage of Dr. Xu, Renxin

Chinese Version İ (Chinese Version)


Personal Statements

Research Interests: Particle astrophysics (e.g., for pulsars, see below)

  1. I am interested in the physics in extraterrestrial extreme-environments. Pulsar is one of the excellent examples with such extremeness, which can be mainly classified into:
    • Rotation-powered pulsars
    • Accretion-powered pulsars
      • Accretion-powered X-ray pulsars
      • X-ray bursters
    • Magnetism-powered (?) pulsars (Magnetars?)
      • Soft gamma ray repeaters
      • Anomalous X-ray pulsars

    Let's listen to the Vela pulsar (the sound of Vela) in radio band ... You are also invited going to the page of Pular Group at PKU.

  2. We currently believe, according to various observations, that pulsars are celestial bodies which are distinguished by their compactness (about 1.4 solar mass, but only about 10 km radius). What's the nature of pulsars? Two models are tried to answer this question:
    • The neutron star model
    • The quark star model
    Neutron stars and quark stars are composed of neutron (hadron) matter and quark matter, respectively. One kind of quark stars, which is popularly discussed in literatures, is strange quark star (i.e., quark star with strangeness). Can we find hard observational evidence to rule out that pulsars are neutron stars or strange stars? This is certainly one of the key projects of astrophysics in the coming years.
  3. A brief introduction to my major research could be found at:

    Strange matter in the Universe: the many faces

    4U 1746-37: a candidate of quark-cluster star? (English version)


Here are some selected papers. A complete set will be available in the future.


    Particle Astrophysics translated by Xiaoyu Lai, Guoyin Chen and Renxin Xu

Welcome to FPS series of meeting, and to the conferences which you may also be interested in:

FPS Pulsar Symposium 6 (FPS6; 2017.6.28-30. Proceedings)

KIAA-WAP II: Cosmic Rays in a New Era (APh_II; 2017.8.17-19)

Quarks and Compact Stars (QCS2017; 2017.2.20-22)

FAST Pulsar Symposium 5 (FPS5; 2016.7.5-8. Proceedings)

Compact stars in the QCD phase diagram (5) (2016.5.23-27)

KIAA Workshop on Astroparticle Physics (APh; 2015.9.28-29)

FAST Pulsar Symposium 4 (FPS4; 2015.7.3-5. Proceedings)

Quarks and Compact Stars (QCS2014; 2014.10.20-22. Proceedings)

Compact stars in the QCD phase diagram (4) (2014.9.26-30)

FAST Pulsar Symposium 3 (FPS3; 2014.7.2-4. Proceedings)

FAST Pulsar Symposium 2 (FPS2; 2013.7.1-3. Proceedings)

Compact stars in the QCD phase diagram (3) (2012.12.12-15)

Neutron Stars and Pulsars: Challenges and Opportunities after 80 Years (IAUS291; 2012.8.20-24)

FAST Pulsar Symposium 1 (FPS1; 2012.8.13-16. Proceedings)

Compact stars in the QCD phase diagram (2) (2009.5.20-24)

CCAST Workshop on dense matter and neutron stars (2003.10.20-24)


I am teaching three courses these years, two (Astrophysics & Atomic physics) for undergraduates and one (Physics of compact stars) for graduates. The book "Introduction to Astrophysics" was written during my teaching of astrophysics.

The schedule of the Astrophysics course (one semester)

The schedule of the Atomic-physics course (one semester)