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Shi Pi’s Homepage

Welcome to Shi Pi’s homepage. [中文版本]

I am a professor in the Institute of Theoretical Physics, Chinese Academy of Sciences (ITP-CAS). My research interests are cosmology and gravity, including but not limited to string inflation, inflation model building, the generation and evolution of cosmological perturbations, (p)reheating, cosmic microwave background radiation anisotropies, dark energy, as well as the gravitational wave astronomy/cosmology. I also serve in the editorial board for JCAP, Chinese Physics C, and Symmetry. For details, see my CV.

My publication list can be found in inspirehep and adsabs. For the information of my research group, click GROUP. Our group meeting will be held in the coffee room of the 3rd floor in the ITP-CAS South Building, from 11 am every Friday. From Sep 2024, our group meeting will be held in CHEP, Peking University, as the ITP-CAS South Building is under repair.

The Gravity and Cosmology (G&C) Group in ITP-CAS also includes Rong-Gen Cai, Zong-Kuan Guo, Qing-Guo Huang, Li Li, Shao-Jiang Wang, Yong Zhou. For the information of the visitors and seminars in the G&C Group, please click here. For the information of internal seminar of G&C Group, check here.

Academic Background

  • Sep 2001 - June 2005: Astronomy Department, Peking University (BSc)
  • Sep 2006 - Jan 2013: Physics Department, Peking University (PhD, Supervisor: Bin Chen)

Research Experience

Research Interest

  • Cosmological perturbation theory
    The study of small deviations from homogeneity and isotropy in the early universe, which serve as the seeds for large-scale structure formation and anasotropies on the cosmic microwave background. Nonlinear perturbations, second-order effects, and their observational signatures are my main interests in the recent years. I am also writing a book.
  • Inflation
    A rapidly exponential expansion of the universe in its early stages, which provides a paradigm to explain both the large-scale uniformity and small primordial density fluctuations. I enter this field by top-down model building from string theory and supergravity, which was quite a hot topic around 2005. However, as PLANCK does not see much deviation from the simplest single-field canonical inflation, the simple phenomenological models still work. We need more observations to go beyond.
  • Primordial black holes
    Black holes that may have formed in the early universe due to the gravitational collapse of large primordial density fluctuations. PBHs are a candidate for dark matter and a potential source of gravitational waves. If so, such GW signals are probable to be detected in the mHz band by the space-borne interferometers LISA/Taiji/TianQin. Stay tuned!
  • Stochastic gravitational wave background
    A random and diffuse background of gravitational waves generated by various early-universe processes, such as phase transitions, cosmic strings, and inflationary fluctuations. It is an important scientific goal for many GW detectors. In 2023, pulsar timing array collaborations claimed a strong evidence for a SGWB at $1~\mathrm{yr}^{-1}$, of which the physical essence is to be confirmed.

Editorial Board

  • Journal of Cosmology and Astroparticle Physics (JCAP), from Jan. 29, 2025.
    The Journal of Cosmology and Astroparticle Physics (JCAP) is an international, peer-reviewed, online-only journal created by the International School for Advanced Studies (SISSA) and the Institute of Physics Publishing (IOP Publishing), following the success of SISSA’s first online journal, JHEP. SISSA Medialab is in charge of the peer review and production of submissions, while IOP Publishing is in charge of their online publication and of subscriptions. It covers all aspects of cosmology and particle astrophysics and encompasses theoretical, observational and experimental areas as well as computation and simulation.
  • Chinese Physics C, from Nov. 22, 2024.
    Chinese Physics C (CPC) is an international peer-reviewed journal covering particle physics, nuclear physics, and related fields. It publishes high-quality research on theoretical, experimental, and computational aspects, including collider physics, neutrino physics, and astrophysics. CPC is indexed in major databases and serves as the official journal of the Chinese Physical Society.
  • Symmetry, from April 1, 2024.
    Symmetry is an international, peer-reviewed, open access journal covering research on symmetry/asymmetry phenomena wherever they occur in all aspects of natural sciences. Symmetry is published monthly online by MDPI.

Blogs

For my work and daily life, click BLOGS (in Chinese only).

Contact me

Please click CONTACT to contact me.

Updated on March 4th, 2025.