Gravitational waves, figuratively called "ripples in the fabric of spacetime," have been drawing much attention as a new "eye" to probe our universe, since its first direct detection in 2015. They provide a new observational tool that is completely independent of conventional electromagnetic methods and are expected to keep increasing their statistical power in the upcoming decades, opening up an era of gravitational-wave cosmology. This workshop takes the advantage of this exciting development and accommodates talks and discussions on related topics, including (but not limited to) sources of gravitational waves, inflation, early universe, gravity beyond general relativity and effective field theories in cosmology.
The workshop in particular encourages interactions among young researchers and reserves extended time for discussions. In order to maximize the communication opportunity without time constraints, and in order to suppress external exposure during the workshop period under the current situation of COVID-19, the participants are expected to stay at a common place of accommodation at which the workshop takes place.
February 28 (Mon)
March 1 (Tue)
March 2 (Wed)
9:00 - 11:00
Closing remarks
Departing from Zao
11:00 - 12:30
Free discussion
Chair: Shuichiro Yokoyama (Zoom)
Subject: Primordial black holes
11:00 - 12:30
Free discussion
Chair: Mai Yashiki
Subject: Hubble tension
12:30 - 14:30
Lunch break
12:30 - 14:30
Lunch break
14:30 - 16:00
Free discussion
Chair: Shuichiro Yokoyama (Zoom)
Subject: Inflationary gravitational wave background
14:30 - 16:00
Free discussion
Chair: Shin'ichi Hirano (Zoom)
Subject: Observational signatures of modified gravity
16:00 - 17:30
Free discussion
Chair: Vicharit Yingcharoenrat
Subject: Implications of GW observations on dark energy theories
16:00 - 17:30
Free discussion
Chair: Samuel Passaglia
Subject: Focus on early universe physics
17:30-19:30
Invited talks
Chair: Atsushi Naruko
Osmin Lacombe (Kyoto)
Title: Brane-world scenarios in presence of a bulk k-essence scalar
Mai Yashiki (Yamaguchi)
Title: Can early and late-time modifications alleviate the H_0 and S_8 tensions simultaneously?
Takashi Hiramatsu (Rikkyo)
Title: Gravitational wave spctra from oscillon formation after inflation
Masahide Yamaguchi (TiTech)
Title: Polychronic Tunneling: New Tunneling Processes Experiencing Euclidean and Lorentzian Evolution Simultaneously
17:30 - 18:30
Invited talks
Chair: Osmin Lacombe
Vicharit Yingcharoenrat (Kavli IPMU)
Title: Beyond Perturbation Theory in Inflation
Samuel Passaglia (Kavli IPMU)
Title: Black Holes and Gravitational Waves from Isocurvature Perturbations
19:45 - 21:00
Dinner
19:30 - 21:00
Dinner
This workshop is supported by
Junior Research Program 2020-2021 (Tohoku Forum for Creativity, Tohoku University)
Atsushi NARUKO (CGP, YITP, Kyoto U) : naruko@yukawa.kyoto-u.ac.jp