Cosmic Acceleration

17 Feb 2020, 08:30 → 19 Feb 2020, 17:00 Asia/Tokyo

Lecture Hall (Kavli IPMU, Kashiwa, Japan)

Dates: February 17 - 19, 2020

Venue: Lecture Hall, Kavli IPMU, Kashiwa, Japan

Overview:

Because gravity is an attractive force, the expansion speed of the Universe should be decreasing. However, observational data accumulated over the years strongly support that the present Universe is in the phase of the accelerated expansion and there was also another phase of the accelerated expansion in the very early Universe. The physical echanism that makes the Universe undergo the ccelerated expansion is not known yet. Some “repulsive force” is necessary. The purpose of this innovative area is to clarify the origin of the accelerated expansion. In order to achieve this goal, it is necessary to investigate the interplay between the repulsive force causing the accelerated expansion and the attractive force sourced by dark matter which triggers the formation of the cosmic structures such as the galaxies and clusters of galaxies. In this innovative area, researchers from different fields join together and form nine sub-groups: inflation in the early Universe (A01), decelerated expansion by dark matter (A02), accelerated expansion by dark energy in the present Universe (A03), cosmic microwave background (B01), galaxy imaging (B02), galaxy spectroscopy (B03), direct measurement of the cosmic expansion (B04), ultimate data analysis (D01), and ultimate theory of the Universe (C01). Not only collaborations within each individual sub-group but also collaborations among the different sub-groups are essential to obtain scientific achievements we desire.

This symposium consists of reports of scientific results by representatives and members of each sub-group as well as researchers selected for public research.

 

Invited speakers:

Chihway Chang (KICP, U. Chicago)
Kyle Dawson (Utah) 
Konstantinos Dimopoulos (Lancaster)
Elisa Ferreira (MPA)
Nicoletta Krachmalnicoff (SISSA)
Tom Melia (Kavli IPMU: TBC)
Marius Millea (BCCP, UC Berkeley)
Alexander Westphal (DESY)


Code of Conduct:
It is the policy of the Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU) that all members and visitors will conduct themselves in a professional manner that is welcoming and free from any form of discrimination, harassment, or retaliation. Members and visitors will avoid any inappropriate actions or statements based on individual characteristics such as age, race, ethnicity, gender, sexual orientation, marital status, nationality, or political affiliation. Disruptive or harassing behavior of any kind will not be tolerated. Harassment includes but is not limited to inappropriate or intimidating behavior and language, unwelcome jokes or comments, unwanted touching or attention, offensive images, photography without permission, and stalking. Members and visitors will treat each other with respect to create a collegial, inclusive, and professional environment at the Kavli IPMU.

 

Organizers:

Masashi Hazumi (KEK/Kavli IPMU)
Eiichiro Komatsu (MPA/Kavli IPMU)
Ryu Makiya (Kavli IPMU)
Satoshi Miyazaki (NAOJ)
Hitoshi Murayama (Kavli IPMU/Berkeley)
Hirosi Ooguri (Caltech/Kavli IPMU)
Naoshi Sugiyama (Nagoya/Kavli IPMU)
Tomomi Sunayama (Kavli IPMU)
Masahiro Takada (Kavli IPMU)
Fuminobu Takahashi (Tohoku U.)
Tomonori Usuda (NAOJ)

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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Monday 17 February

08:30 → 09:00 Registration & coffee & snacks

09:00 → 10:20 Fe 17 Morning session I

Convener: Masahiro Takada (Kavli IPMU)

09:00 logistics information

09:05 Accelerating Universe Overview

Speaker: Hitoshi Murayama (Kavli IPMU/Berkeley)

HitoshiMurayama_Overview.pdf

09:30 (Invited talk) From Quantum Gravity to Low Energy Physics

Speaker: Yasunori Nomura (Berkeley/Kavli IPMU)

YasunoriNomura.pdf

YasunoriNomura.pdf

10:00 Cross-correlation of the astrophysical gravitational-wave background with galaxy clustering

Speaker: Valeri Vardanyan (Kavli IPMU)

ValeriVardanyan.pdf

10:20 → 10:45 Coffee break

10:45 → 11:55 Feb 17 Morning session II

Convener: Masahiro Takada

10:45 A01

Speaker: Misao Sasaki (Kavli IPMU)

A01_MisaoSasaki.pdf

11:15 Formations and clusterings of primordial black hole dark matter formed in the matter dominated Universe

Speaker: Kaz Kohri (KEK)

KazKohri.pdf

11:35 primordial black holes with primordial non-Gaussianity

Speaker: Yokoyama Shuichiro (KMI, Nagoya University)

ShuichiroYokoyama.pdf

11:55 → 13:30 Lunch break & Poster session

13:30 → 15:00 Feb 17 Afternoon session I

Convener: Fuminobu Takahashi (Tohoku U.)

13:30 (Invited talk) The light dark matter search— what’s going on at an MeV?

Speaker: Tom Melia (Kavli IPMU)

TomMelia.pdf

14:00 Searching for particle dark matter by cross-correlating gamma rays and large-scale structure

Speaker: Shin'ichiro Ando (University of Amsterdam)

ShinichiroAndo.pdf

14:20 Constraint on the nature of dark matter by high-resolution cosmological simulations and next generation spectroscopy observations

Speaker: Tomoaki Ishiyama (Chiba University)

TomoakiIshiyama.pdf

14:40 The study on quantum gravity theory through polarization measurements of high energy gamma rays from gamma ray bursts

Speaker: Shuichi Gunji (Yamagata University)

ShuichiGunji.pdf

15:00 → 15:30 IPMU Tea Time & Poster session

15:30 → 17:30 Feb 17 Afternoon session II

Convener: Eiichiro Komatsu (MPA/Kavli IPMU)

15:30 (Invited talk) Goals and challenges for next generation of CMB experiments

Speaker: Nicoletta Krachmalnicoff (SISSA)

NicolettaKrachmalnicoff.pdf

16:00 B01

Speaker: Masashi Hazumi (KEK/Kavli IPMU)

B01_MasashiHazumi.pdf

16:15 Simons Array

Speaker: Hasegawa Masaya (KEK)

MasayaHasegawav.pdf

16:30 Optical designs and performance of LiteBIRD

Speaker: Hiroaki Imada (Université Paris-Saclay, CNRS/IN2P3, IJCLab)

HiroakiImada.pdf

16:45 Development of LiteBIRD polarization modulator

Speaker: Yuki Sakurai (Kavli IPMU)

YukiSakurai.pdf

17:00 Cryogenics architecture for LiteBIRD satellite

Speaker: Takashi Hasebe (JAXA/ISAS)

TakashiHasebe.pdf

17:15 Simultaneous determination of the cosmic birefringence and miscalibrated polarisation angles from LiteBIRD

Speaker: Yuto Minami (KEK)

YutoMinami.pdf

17:30 → 18:00 Poster machine-gun talks

Poster presentation.pdf

Tuesday 18 February

08:30 → 09:00 Coffee & snacks

09:00 → 10:30 Feb 18 Morning session I

Convener: Masashi Hazumi (KEK/Kavli IPMU)

09:00 A02

Speaker: Fuminobu Takahashi (Tohoku University)

A02_FumiTakahashi.pdf

09:30 Supersymmetric model for dark matter and muon g-2

Speaker: Norimi Yokozaki (Tohoku University)

NorimiYokozaki.pdf

09:50 New Insights in to the Stellar Components and Dark Halo in the Milky Way

Speaker: Chiba Masashi (Tohoku University)

MasashiChiba.pdf

10:10 Diversity of the central dark matter densities in the Galactic dwarf spheroidals

Speaker: Kohei Hayashi (ICRR, U. Tokyo)

KoheiHayashi.pdf

10:30 → 10:45 Coffee break

10:45 → 12:05 Feb 18 Morning session II

Convener: Masashi Hazumi

10:45 (Invited talk) UV-IR Bottlenecks for Inflation and the Higgs

Speaker: Alexander Westphal (DESY)

AlexWestphal.pdf

11:15 (Invited talk) Ultra-light Dark Matter

Speaker: Elisa Ferreira (MPA)

ElisaFerreira.pdf

11:45 Revisiting slow-roll dynamics and the tensor tilt in general single-field inflation

Speaker: Tsutomu Kobayashi (Rikkyo University)

TsutomuKobayashi.pdf

12:05 → 12:10 Group Photo

12:10 → 13:30 Lunch break & Poster session

13:30 → 15:10 Feb 18 Afternoon session I

Convener: Satoshi Miyazaki

13:30 (Invited talk) eBOSS: Cosmology with Baryon Acoustic Oscillations and Redshift Space Distortions

Speaker: Kyle Dawson (The University of Utah)

KyleDawson.pdf

14:00 B03

Speaker: Masahiro Takada (Kavli IPMU)

B03_update_MasahiroTakada.pdf

14:30 The impact of projection effects on cluster observables

Speaker: Tomomi Sunayama (Kavli IPMU)

TomomiSunayama.key

14:50 Cosmological constraints from galaxy-galaxy lensing and clustering with the Subaru HSC and SDSS BOSS data

Speaker: Hironao Miyatake (Nagoya University)

HironaoMiyatake.pdf

15:10 → 16:00 IPMU Tea Time & Poster session

16:00 → 18:00 Feb 18 Afternoon session II

Convener: Misao Sasaki

16:00 (Invited talk) The Hubble Hunter's Guide

Speaker: Marius Mellea (Berkeley)

MariusMillea.pdf

16:30 A03

Speaker: Shinji Tsujikawa (Tokyo University of Science)

A03_ShinjiTsujikawa.pdf

17:00 Hubble Tension: New Physics vs Systematics

Speaker: Arman Shafieloo (KASI)

ArmanShafieloo.pdf

17:20 Initial density field reconstructions from high redshift galaxy surveys

Speaker: Metin Ata (Kavli IPMU)

MetinAta.pdf

17:40 Computations of quantities characterizing PBHs formed from primordial perturbations

Speaker: Teruaki Suyama (Tokyo Institute of Technology)

TeruakiSuyama.pdf

19:00 → 21:00 Banquet @ The Meat Dutch; 19:00 -

30min from IPMU (by walk), 5min from Mitsui-Garden Hotel or Kashiwa-no-Ha Campus station

Wednesday 19 February

08:30 → 09:00 Coffee & snacks

09:00 → 10:40 Feb 19 Morning session I

Convener: Tomonori Usuda

09:00 B02

Speaker: Satoshi Miyazaki (NAOJ)

09:30 Development and testing of new CMOS

Speaker: Yutaka Komiyama (NAOJ)

YutakaKomiyama.pdf

09:50 Splashback radius of clusters in the HSC survey

Speaker: Masamune Oguri (U. Tokyo/Kavli IPMU)

MasamuneOguri.pdf

10:10 (invited talk) Cosmology in the Era of Galaxy Surveys -- from DES to LSST

We are at an exciting time of cosmology with a number of Stage III galaxy surveys finishing up and Stage IV experiments on the horizon. In this talk I will summarize some of the first year DES cosmology results, focusing on the 3x2pt and 5x2pt analysis which probes the large-scale structure through the galaxy and weak lensing fields. I will point out some of the challenges going forward with DES and LSST, as well as some new exciting directions that the new data allows us to explore.

Speaker: Chihway Chang (University of Chicago)

ChihwayChang.pdf

10:40 → 11:00 Coffee break

11:00 → 12:00 Feb 19 Morning session II

Convener: Tomonori Usuda

11:00 Laboratory searches for pseudo Nambu-Goldstone bosons with stimulated photon-photon colliders

Speaker: Kensuke Homma (Hiroshima U.)

KensukeHomma.pdf

11:20 Measurement of expansion of the Universe using high-z type Ia supernovae

Speaker: Naoki Yasuda (Kavli IPMU)

NaokiYasuda.pdf

11:40 Structure of subhalos around Milky Way-mass galaxies in CDM and SIDM universe

Speaker: Takashi Okamoto (Hokkaido Uniersity)

TakashiOkamoto.pdf

12:00 → 13:15 Lunch break & Poster session

13:15 → 15:40 Feb 19 Afternoon session I

Convener: Masahiro Takada

13:15 B04

Speaker: Tomonori Usuda (NAOJ)

B04_TomonoriUsuda.pptx

13:40 Development of laser comb to calibrate high dispersion spectrograph for radial velocity measurement

Speaker: Hajime Inaba (National Institute of Advanced Industrial Science and Technology (AIST))

HajimeInaba.pdf

14:00 First Stability Results of our Second Gen. Astro-Comb

Speaker: Malte Schramm (NAOJ)

14:20 D01

Speaker: Eiichiro Komatsu (MPA/Kavli IPMU)

D01_EiichiroKomatsu.pdf

14:45 HSC-PFS cross-correlation simulated by the “lognormal_lens” code

Speaker: Issha Kayo (Tokyo University of Technology)

IsshaKayo.pdf

15:10 Thermal history of the universe probed by a joint analysis of the thermal Sunyaev–Zeldovich effect and galaxy surveys

Speaker: Ryu Makiya (Kavli IPMU)

RyuMakiya.pdf

15:35 Closing remark

Speaker: Hitoshi Murayama (Kavli IPMU/Berkeley)

HitoshiMurayama_Concluding Remark 2020.pdf