Non-linear aspects of cosmological gravitational waves

18 Jul 2022, 09:00 → 22 Jul 2022, 18:00 Asia/Tokyo

Lecture Hall, Kavli IPMU (Hybrid )

Non-linear aspects of cosmological gravitational waves

 

Dates: 18 July (Mon., Holiday) - 22 July (Fri) 2022

Venue: Hybrid style with Lecture Hall, Kavli IPMU, Kashiwa, Japan

(sessions will be held on site, with some of them organized in a hybrid style.) 

Overview:

The discovery of gravitational waves (GWs) by the LIGO and Virgo collaborations has brought GWs as a new and powerful tool for cosmology to study the physics of the universe. The equivalence of energy of matter residing in space-time and the geometry of the space-time tells us that GWs are persistent even in de Sitter space. Further, due to the intrinsic non-linear nature of gravity, cosmological perturbations other than GWs such as observable large-scale structure can source GWs and bring them into existence. Thus, GWs enable us to study both the physics of the very early universe and the evolution of cosmological structure, which will be observed with great accuracy by future surveys such as LSST, Euclid, WFIRST and so on.

The aim of the workshop is, facing the dawn of multi-messenger cosmology led by GWs, to promote stimulating and intensive discussions among the experts on non-linear aspects of GWs and to initiate possible collaborations. We plan to, in addition to the core participants, invite a few key researchers with broad expertise. During the workshop, we plan to organize a few informal seminars a day, and leave ample time for free discussions.

Confirmed speakers:

Hsin-Yu Chen (MIT)

Guillem Domenech (Padova, online)

Donghui Jeong (PSU/KIAS)

Ryusuke Jinno (Madrid)

Sugumi Kanno (Kyushu)

Tsutomu Kobayashi (Rikkyo)

Kazunori Kohri (KEK)

Sachiko Kuroyanagi (Madrid/Nagoya)

Maria Mylova (Ewha)

Antonio Riotto (Geneva, online)

Teruaki Suyama (Tokyo Tech)

Volodymyr Takhistov (Kavli IPMU)

Gianmassimo Tasinato (Swansea, online)

Takahiro Terada (IBS)

Yuko Urakawa (KEK)

Organizers :

Jinn-Ouk Gong, Ewha
Misao Sasaki, Kavli IPMU

Address:
Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU),
The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa City, Chiba 277-8583, Japan

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20200722_Non-linear aspects of cosmological gravitational waves.JPG

Countermeasure against Covid.pdf

Monday, 18 July

13:30 → 14:00 Covid-19 antigen test

14:00 → 17:00 Informal discussion

Convener: Misao Sasaki

Tuesday, 19 July

09:30 → 10:00 Covid-19 antigen test

10:00 → 11:30 Morning session

10:00 Tracking the origin of black holes with the stochastic gravitational wave background popcorn signal

Speaker: Sachiko Kuroyanagi (Madrid/Nagoya)

11:30 → 13:30 Lunch

13:30 → 15:00 Afternoon session 1

13:30 delta N formalism for gravitational waves

Speaker: Yuko Urakawa (KEK)

15:00 → 15:30 Coffee / Tea break

15:30 → 17:00 Afternoon session 2

15:30 Deformation of the gravitational wave spectrum by density perturbations

Speaker: Ryusuke Jinno (Madrid)

17:00 → 18:30 Afternoon session 3

17:00 Cosmological anisotropies of the stochastic gravitational wave background

Speaker: Gianmassimo Tasinato (Swansea)

Wednesday, 20 July

09:30 → 10:00 Covid-19 antigen test

10:00 → 11:30 Morning session

10:00 New Observables of Inflaton Fragmentation

Speaker: Volodymyr Takhistov

10:45 Effective field theory of teleparallel gravity

Speaker: Maria Mylova (Ewha)

11:30 → 13:30 Lunch

13:30 → 15:00 Afternoon session 1

13:30 Graviton nongaussianity in α-vacuum

Speaker: Sugumi Kanno (Kyushu)

15:00 → 15:30 Coffee / Tea break

15:30 → 17:00 Afternoon session 2

15:30 Gravitational lensing of gravitational waves as a probe of small-scale matter fluctuations

Speaker: Teruaki Suyama (Tokyo Tech)

17:00 → 18:30 Afternoon session 3

17:00 PBHs in the Era of Gravitational Wave Astronomy

Speaker: Antonio Riotto (Geneva)

Thursday, 21 July

09:30 → 10:00 Covid-19 antigen test

10:00 → 11:30 Morning session

10:00 Gravitational-wave Standard Sirens with Electromagnetic Counterparts

Speaker: Hsin-Yu Chen (MIT)

11:30 → 13:30 Lunch

13:30 → 15:00 Afternoon session 1

13:30 Gravitational Waves Induced by Curvature Perturbations and Effects of Matter/Radiation Transition

Speaker: Takahiro Terada (IBS)

15:00 → 15:30 Coffee / Tea break

15:30 → 17:00 Afternoon session 2

15:30 Modified gravity with two tensorial degrees of freedom: Black holes and cosmology

Speaker: Tsutomu Kobayashi (Rikkyo)

17:00 → 18:30 Afternoon session 3

17:00 Gravitational waves from primordial fluctuations

Speaker: Guillem Domenech (Padova)

Friday, 22 July

09:30 → 10:00 Covid-19 antigen test

10:00 → 11:30 Morning session

10:00 Gauge-Invariant Tensor Perturbations Induced from Scalar Perturbations

Speaker: Donghui Jeong (PSU/KIAS)

11:30 → 11:40 Group Photo

11:40 → 13:30 Lunch

13:30 → 15:00 Afternoon session 1

13:30 1) Anisotropies of GWs from merging PBHs, and 2) PBHs and GWs from Tachyonic Instability in Higgs-R2 Inflation

Speaker: Kazunori Kohri (KEK)

15:00 → 15:30 Coffee / Tea break

15:30 → 17:00 Informal discussion