Challenges at the CMB Frontier

29 juin 2026, 10:30 → 3 juil. 2026, 17:40 Asia/Tokyo

Chino Cultural Complex

Tommaso Ghigna (QUP-KEK)

The workshop intends to bring together people from different experiments and backgrounds to discuss CMB science, data analysis, instrumentation, synergies between ground and space as well as other astronomical probes. 

The following topics will be covered in the workshop:

• CMB Experiments & Instrumentation

• CMB Data Analysis(map-making, component separation, likelihood methods)

• Science Results from Recent CMB Data

• Large-Scale Structure (LSS) Probes

• CMB × LSS Correlations

• Synergies with Astrophysical Probes

This workshop is sponsored by JSPS KAKENHI Transformative Research (A): Cosmogenesis – B02: CMB Physics (PI: Yuki Sakurai) and CMB-Inflate (coordinator: Guillaume Patanchon).

The workshop is hosted by SUWA university from June 29th to July 3rd. It is a follow up to the CMB B-mode NEXT workshop that happened in January 2025 in KEK: https://indico.in2p3.fr/event/34780/ & https://www2.kek.jp/ipns/en/news/7008/.

We are now building up the program and we will provide more information very soon. The workshop will take place inside Chino Cultural Complex which is located at walking distance from JR Chino station: map.

The detailed program will be provided soon. 

Confirmed Invited Speakers:

Shunsuke Adachi (Okayama University)
Elisa Ferreira (Kavli IPMU)
Bruno Maffei (Institut d'Astrophysique Spatiale)
Kana Moriwaki (University of Tokyo)
Jingjing Shi (Kavli IPMU)
Yoshinori Sueno (Kavli IPMU)
Junya Suzuki (University of Kyoto)
Ryota Takaku (Okayama University)
Akio Taniguchi (Kitami Institute of Technology)
Hideki Umheata (Nagoya University)

lun. 29 juin

10:30 Coffee and Reception

Remarks: Opening

CMB & Cosmology: Current Status

1 Cosmology at a Crossroads: Tensions, Synergies, and the Future Role of the CMB

Orateur: Prof. Elisa Ferreira (Kavli IPMU)

12:30 Lunch

CMB Experiments: CMB Spectral Distortions

2 Measuring CMB spectral distortions with FOSSIL and BISOU

Orateur: Prof. Bruno Maffei (IAS Paris)

3 APSERa and PRATUSH

Orateur: Prof. Mayuri S. Rao (Raman Research Institute)

4 COSMO

Orateur: Prof. Luca Lamagna (U Rome Sapienza)

15:40 Coffee Break

CMB Experiments: CMB Experiment Design and Development

5 FOSSIL's preliminary thermal architecture

Orateur: Dr Valentin SAUVAGE (Institut d'Astrophysique Spatiale)

6 BISOU: A Balloon-Borne Pathfinder for CMB Spectral Distortion Measurements

Orateur: Morgane LOQUET LE GALL

7 Study of cosmic ray impacts on cryogenic high sensitivity detectors

Orateur: Anaïs Besnard (Institut d'Astrophysique Spatiale (IAS))

8 Modeling thermal contribution produced by Cosmic Rays impact on a sub-K bolometric array at L2

Orateur: Dr Guillermo Pascual-Cisneros (Kavli IPMU)

CMB & Cosmology: Computing

9 CPU vs GPU (TBD)

Orateur: Dr Yusuke Takase (NTT Inc.)

mar. 30 juin

Outreach Event: Public Lecture

Présidents de session: Marta Monelli (Kavli IPMU), Prof. Ryota Takaku (Okayama University), Tommaso Ghigna (QUP-KEK)

mer. 1 juillet

CMB Experiments

10 LiteBIRD

Orateur: Ryota Takaku (Okayama University)

11 Simons Observatory

Orateur: Dr Yoshinori Sueno (Kavli IPMU)

10:50 Coffee Break

CMB Experiments

12 GroundBIRD: A Fast-Rotating Polarimeter for Large-Scale CMB Polarization Measurements

Orateur: Junya Suzuki

13 GroundBIRD: Preliminary Results on Polarization Angle Calibration with a Sparse Wire Grid

Orateur: Miku Tsujii (Tohoku University)

12:10 Lunch

CMB Experiments: Instrumental Systematic Effects

14 Overview of Instrumental Systematics

Orateur: Marta Monelli (Kavli IPMU)

15 Ungrasp: Coordinate-Independent Beam Modeling for CMB Experiments via Spherical Wave Expansion

Orateur: Prof. Maurizio Tomasi (Università degli Studi di Milano)

16 Systematic effect induced by misalignment in a Reflective Polarization Modulator for CMB, and application to the LiteBIRD case

Orateur: Simone Stellati

15:00 Coffee Break

CMB Experiments: Instrumental Systematic Effects

17 Mitigating correlated 1/f noise in map-making: A comparison of approximate and exact noise covariance models

Orateur: Dr Avinash Anand (University of Rome "Tor Vergata")

18 The Simons Observatory: A framework for efficient map-based simulations of instrumental systematics for CMB surveys

Orateur: Magdy Morshed

19 An efficient way to compute beam convolution at the map level

Orateur: M. Camille Demay (University of Trento, University of Ferrara)

Poster Session: Fire Slides

Poster Session

18:30 Dinner

jeu. 2 juillet

CMB Experiments

20 South Pole Observatory

Orateur: Dr Dominic Beck (Stanford University)

Astronomy

21 Line Intensity Mapping as a Probe of Galaxy Formation, Reionization, and Cosmology

Orateur: Prof. Kana Moriwaki (The University of Tokyo)

10:50 Coffee Break

Astronomy

22 DESHIMA 2.0: Observations, Calibration, and Data Analysis with an Ultra-wideband Submillimeter Integrated Superconducting Spectrometer

Orateur: Dr Akio Taniguchi (Kitami Institute of Technology)

23 SPT-3G Lensing Templates for South Pole Observatory

Orateur: Yuka Nakato (Stanford University)

12:10 Lunch

CMB Experiments: Foreground Modeling & Component Separation

24 Galactic Foregrounds (TBD)

Orateur: Prof. Nicoletta Krachmalnicoff (SISSA)

25 Component Separation for CMB Experiments (TBD)

Orateur: Dr Alessandro Carones (SISSA)

15:00 Coffee Break

CMB Experiments: Foreground Modeling & Component Separation

26 Combining Parametric Methods and Observation Matrices for Foreground Cleaning in the context of Simons Observatory

Orateur: Dr Baptiste Jost (Kavli IPMU)

27 Component Separation and Cosmological Parameter Estimation from Planck Data

Orateur: Camille Gubeno (ENS Paris)

28 Addressing Synchrotron Challenges for CMB Observations: ELFS-SA Collaboration

Orateur: Dr Elena De La Hoz (NASA Goddard)

29 Semi-blind component separation for measuring CMB B-mode polarization with a satellite mission

Orateur: Hoang Viet Tran

30 Foreground Cleaning with Delta-map for Large-scale CMB B-mode Polarization

Orateur: M. Kiyoshi Ikuma

ven. 3 juillet

CMB Experiments: Dark Matter and Dark Energy

31 Exploring dark matter on Earth

Orateur: Shunsuke Adachi

32 From DESI to PFS: Cosmology with Spectroscopic Surveys and Connections to the CMB

Orateur: Prof. Jingjing Shi (Kavli IPMU)

10:50 Coffee Break

Astronomy

33 Galaxy Formation in Cosmic Large-Scale Structures

Orateur: Prof. Hideki Umehata (Nagoya University)

34 GION Multi-Wavelength Lightcone Cosmological Simulations: Applications to CMB x LSS Cross-Correlations

Orateur: Prof. Ken Osato (Chiba University)

12:10 Lunch

CMB & Cosmology

35 Mapmaking and Likelihood

Orateur: Dr Giacomo Galloni (Universita di Ferrara)

36 High-Sensitivity Maps of CMB B-modes and Galactic Dust from the BICEP/Keck

Orateur: Dr Dominic Beck (Stanford University)

37 Unlocking reionisation with Planck and WMAP low-ℓ polarisation: a unified CMB likelihood approach

Orateur: Valentina Genesini (Universita di Ferrara)

15:00 Coffee Break

CMB & Cosmology: CMB and Cosmology

38 Discovering Axion-like particles using CMB as a backlight

Orateur: Harsh Metha (Tata Institute of Fundamental Research, Mumbai)

39 Resolving CMB-BAO tension with a large cosmic birefringence angle during reionization

Orateur: Dr Salvatore Sirletti (Kavli IPMU)

40 LiteBIRD’s view on the relativistic Sunyaev-Zel’dovich effect

Orateur: Vipul Prasad Maranchery (University of Rome Tor Vergata, Italian Space Agency)

41 Probing time-dependent cosmic birefringence with LiteBIRD

Orateur: Prof. Ippei Obata (IPNS-KEK)

Remarks: Closing