iTHEMS Cosmology Forum n°2 - Stochastic gravitational waves: fossils from the early universe

Contribution List

2. (Keynote) Opening a new door: Nano-Hertz Gravitational-Wave Astronomy

Dr Keitaro Takahashi (Kumamoto University)

27/09/2024, 09:30

Pulsar timing array is an experiment to detect gravitational waves with a frequency of nanohertz by accurate long-term observation of pulsars. It will not only open a new door for cosmology and astrophysics but also pave the way for multi-wavelength gravitational-wave astronomy. However, pulsar timing array suffers from various systematic errors such as dispersion delays caused by interstellar...

3. Supermassive black hole formation: insights from astrophysical simulations

Dr Kazuyuki Sugimura (Hokkaido University)

27/09/2024, 10:45

Supermassive black holes (SMBHs), with masses exceeding 10^6
solar masses (Msun), are believed to reside at the centers of nearly
all galaxies and significantly influence their host galaxies through
the so-called "co-evolution" of galaxies and SMBHs. However, the
origin of SMBHs remains a mystery and a major challenge in modern
astronomy. In this talk, I will first review the current...

5. First-order phase transitions and gravitational wave production in the early Universe

Dr Ryusuke Jinno (Kobe University)

27/09/2024, 13:30

6. Scalar-induced gravitational waves as a cosmological phonograph

Dr Yuichiro Tada (Nagoya University)

27/09/2024, 15:30

Our universe has experienced phase transitions/crossovers several times throughout its thermal history. The gravitational wave (GW) as a cosmological phonograph can record and tell us about such history thanks to its high penetration ability. In particular, GWs sourced by oscillations of density contrasts called scalar-induced GWs (SIGWs), have sensitivity not only to the background...