Theory

Team Members

Fellows:

 艾若哲Frederico Arroja, 廉東漢 Dong-han Yeom (Leader),法比恩 Fabien Nugier,

Students:

蔣序文 Hsu-Wen Chiang, 陳哲佑 Che-Yu Chen胡耀傑 Yao-Chieh Hu,

林裕翔Yu-Hsiang Lin, 陳建廷Chien-Tin Chen

We aim to understand the universe and exploit it as an ultimate laboratory to explore fundamental physics.

We have been bombarded with UNKNOWNS from cosmology since the end of the 20th century. They are about:

1. Initial condition of the universe: INFLATION does a great job.

2. Cosmic structure: Structure formation requires extra attractive gravity, probably from DARK MATTER, an unknown energy source of (attractive) gravity.

3. Cosmic expansion: The late-time accelerating expansion requires anti-gravity (repulsive gravity), probably from DARK ENERGY or MODIFIED GRAVITY, i.e., an unknown energy source of anti-gravity or unknown modification of the gravity law.

Another unknown is from particle physics:

4. NEUTRINO OSCILLATION and NEUTRINO MASS: They play a role not only in particle physics, but also in               cosmology concerning cosmic structure formation.

We attempt to unravel these unknowns. Our research can be divided into three subjects:

(1)Inflation and Early Universe

(2)Dark Matter, Dark Energy, and Late-Time Universe

(3)Gravity

Cosmic History 2_CMB_Timeline300_no_WMAP

Cosmic History 5.2_Structure Formation [Planck]