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2023 Summer Collaboration Meeting

→ America/Los_Angeles
SLAC & Zoom

SLAC & Zoom
Description

The summer 2023 CMB-S4 workshop will focus on continuing the development of the broadest possible CMB-S4 science case, including in conjunction with other experiments and observatories. One key goal of the meeting will be to outline the second edition of the CMB-S4 Science Book. The meeting will be in person and remote, open to CMB-S4 members and non-members alike.

The meeting will include plenary science sessions on the following topics:

  • Synergies of Large Scale Structure Surveys with CMB-S4 (Organizers: Mathew Madhavacheril & Alexandra Amon)
  • The Transient Sky & Time-Domain Astrophysics (Organizers: Alex Tetarenko, Tarraneh Eftekhari and Anna Ho)
  • Galactic Science (Organizers: Giuseppe Puglisi & Michael Busch).A discussion on the recent results in the literature concerning the alignment of dust filaments around the S4 footprint  and the synergistic role of foreground tracers (e.g. Faraday rotation, dust extinction, gas tracers) to improve our  Galactic modeling.
  • Clusters & Sources (Organizers: Srinivasan Raghunathan & Boris Bolliet)
  • Inflation (Organizers: Kimmy Wu & Robert Caldwell)
  • Beyond-Standard Model Physics & Particle Physics (Organizers: Alex Friedland & Cynthia Trendafilova)

The workshop will include:

  • A discussion with our Equity, Diversity & Inclusion committee

  • A closed Junior member lunch and two JSAC plenary sessions (organized by Lindsey Bleem and the JSAC committee, jsac@cmb-s4.org)

  • Parallel work sessions on the second edition of the Science Book

  • A poster session

  • An evening EPO event

  • A tour of the CMB labs at SLAC & Stanford

Please familiarize yourself with the meeting code of conduct (https://sites.google.com/cmb-s4.org/cmb-s4/code-of-conduct) and respect it in all venues. On zoom, please set your name to "First Last (preferred pronouns)", and mute your microphone. To ask a question please raise your hand or post it to the chat.

For in-person attendees, the registration fee is 99 USD for senior members and 60 USD junior members. Links for registration can be found here: https://sites.google.com/cmb-s4.org/cmb-s4-summer2023/registration.

The registration fee includes venue costs, morning and afternoon coffee breaks, lunch, a reception, and other miscellaneous costs.

List of participants.

 

Rooms & Zooms:

  • Plenary sessions: Kavli Auditorium and plenary zoom line;
  • Parallel sessions: Inflation, Clusters: Trinity Conference Room (SUSB 1st floor) and parallel 1 zoom line;
  • Parallel sessions: LSS, BSM: Redwood A/B room (Bldg 48, 1st floor) and parallel 2 zoom line;
  • Parallel sessions: GS, Transients: Kavli 3rd floor conference room and parallel 3 zoom line;
  • Impromptu meetings: SUSB Toluca and parallel 4 zoom line.

 

Zoom lines for plenary, parallel 1, parallel 2, parallel 3, parallel 4.

Sign up sheet for (1) LSST camera tours, (2) SLAC lab tour, and (3) Stanford campus lab tours: Lab tours sign up

Link to meeting notes for plenary sessions.

LOC announcements for the day.

 

 

Participants
  • Abigail Crites
  • Adam Anderson
  • Akito Kusaka
  • Alec Hryciuk
  • Aleksandra Kusiak
  • Alex Krolewski
  • Alexandra Rahlin
  • Amber Lennox
  • Amy Bender
  • Andrea Zonca
  • Anirban Roy
  • Anthony Challinor
  • Anthony Huber
  • Anton Baleato Lizancos
  • Ari Cukierman
  • Arianna Rizzieri
  • Aritoki Suzuki
  • Ayodeji Ibitoye
  • Bai-Chiang Chiang
  • Benjamin Saliwanchik
  • Benjamin Wallisch
  • Bobby Besuner
  • Bradford Benson
  • Brenna Flaugher
  • Brian Koopman
  • Bruce Partridge
  • Bryan Field
  • Bryan Steinbach
  • Carina Baker
  • Carlo Baccigalupi
  • Carlos Hervias-Caimapo
  • Cesiley King
  • Chang Feng
  • Charles Lawrence
  • Christian Reichardt
  • Clara Vergès
  • Clarence Chang
  • Clem Pryke
  • Colin Bischoff
  • Colin Hill
  • Congyao Zhang
  • Cristian Vargas
  • Cyndia Yu
  • Cynthia Trendafilova
  • Daan Meerburg
  • Daisuke Nagai
  • Daniel Green
  • Darcy Barron
  • David Goldfinger
  • David Schlegel
  • David Zegeye
  • Dick Bond
  • Dominic Beck
  • Don Petravick
  • Donald Zito
  • Douglas Scott
  • Elena de la Hoz
  • Elena Pierpaoli
  • Eleonora Di Valentino
  • Elisa Russier
  • Ely Kovetz
  • Emmanuel Schaan
  • Eric Hivon
  • Eric Linder
  • Erwin Lau
  • Evan Grohs
  • Fazlu Rahman
  • Federico Bianchini
  • Federico Nati
  • Fei Ge
  • Felipe Maldonado
  • Felipe Menanteau
  • Florian Keruzore
  • Gabriela Marques
  • Gensheng Wang
  • Gerrit Farren
  • Gil Holder
  • Giulio Fabbian
  • Giuseppe Puglisi
  • Grant Teply
  • Gregg Thayer
  • Gregory Tucker
  • Guillermo Quispe
  • Hamza El Bouhargani
  • Haoyu Wu
  • Hogan Nguyen
  • Howard Hui
  • Ian Birdwell
  • Ian Gullett
  • Ioana Zelko
  • Jacques Delabrouille
  • Jae Hwan Kang
  • Jamie Bock
  • Jeff McMahon
  • Jeff Zivick
  • Jeffrey Filippini
  • Jesse Treu
  • Jessica Aguilar
  • Jia Liu
  • Jian Yao
  • Jim Strait
  • Joaquin Vieira
  • Joe Silber
  • Joel Meyers
  • Johanna Nagy
  • Johannes Hubmayr
  • John Carlstrom
  • John Hood
  • John Kovac
  • John Ruhl
  • Joseph Mohr
  • Joshua Sobrin
  • Julian Borrill
  • Julien Carron
  • Juliet Crowell
  • Justin Clancy
  • Kam Arnold
  • Katie Harrington
  • Ken Ganga
  • Kenny Lau
  • Kevin Huffenberger
  • Kevork Abazajian
  • Kimberly Boddy
  • Kimmy Wu
  • Kirit Karkare
  • Kolen Cheung
  • Laura Newburgh
  • Lindsay Lowry
  • Lindsey Bleem
  • Louis Legrand
  • Magdy Morshed
  • Mahsa Rahimi
  • Marcelo Alvarez
  • Margaret Ikape
  • Maria Salatino
  • Marilena Loverde
  • Marion Dierickx
  • Marius Millea
  • Martina Gerbino
  • Mathew Madhavacheril
  • Mathieu Remazeilles
  • Matthaeus Leitner
  • Matthew Petroff
  • Matthew Young
  • Mauricio Pilleux
  • Melanie Archipley
  • Michael Niemack
  • Miranda Eiben
  • Mudit Jain
  • Murali Saravanan
  • Murdock Gilchriese
  • Mustafa Amin
  • Natalie Roe
  • Neelima Sehgal
  • Nicholas Galitzki
  • Nick Emerson
  • Nils Halverson
  • Noah Sailer
  • Osamu Tajima
  • Patricio Gallardo
  • Paul Grimes
  • Paul Williams
  • Pete Barry
  • Philip Lubin
  • Rachel Osten
  • Radek Stompor
  • Raphael Flauger
  • Rebecca Baturin
  • Reijo Keskitalo
  • Robert Caldwell
  • Roger O'Brient
  • Sam Guns
  • Sanah Bhimani
  • Sara Simon
  • Sarah Shandera
  • Sebastian Belkner
  • Sebastian Bocquet
  • Selim Hotinli
  • Shabbir Shaikh
  • Shamik Ghosh
  • Shannon Duff
  • Shawn Henderson
  • Shouvik Roy Choudhury
  • Simon Biquard
  • Simone Ferraro
  • Sotirios Sauveur Loucatos
  • Srinivasan Raghunathan
  • Steven Allen
  • Susan Clark
  • Suvodip Mukherjee
  • Tarraneh Eftekhari
  • Theodore Kisner
  • Thibault ROMAND
  • Thuong Hoang
  • Tom Cecil
  • Tom Crawford
  • Tony Mroczkowski
  • Tyler Natoli
  • Vivian Miranda
  • Wei Quan
  • Will Coulton
  • Zach Weiner
  • Zeeshan Ahmed
Contact
  • Monday, 31 July
    • 10:30 → 11:00
      Coffee 30m
    • 11:00 → 11:15
      Welcome 15m

      Welcome / Code of Conduct / Goals of Meeting.

      Plenary Session Notes
      Video Schaan, Clark, Wechsler
      Welcome slides
    • 11:15 → 12:00
      CMB-S4 Overview Part 1 45m
      Overview 1 slides
      • Design-driving science 10m
        Speakers: Colin Bischoff (University of Cincinnati), Joel Meyers (Southern Methodist University;), Kevin Huffenberger (Florida State University)
        Video Huffenberger
      • Instrument and Observations Overview 15m
        Speaker: John Ruhl (Case Western Reserve University)
        Video Ruhl
      • Expected Data Products 10m
        Speaker: Julian Borrill (Lawrence Berkeley National Laboratory & UC Berkeley)
        Video Borrill
      • Status and Timeline 10m
        Speakers: John Carlstrom (University of Chicago;Argonne National Laboratory), Jim Strait (Lawrence Berkeley National Laboratory;)
        Video Strait
    • 12:00 → 13:00
      Lunch/Posters 1h
    • 13:00 → 14:30
      Plenary Science: CMB x LSS
      Convener: Mathew Madhavacheril (University of Pennsylvania)
      Clusters/SZ plenary
      Video Osten, Menanteau
    • 14:30 → 15:00
      Coffee 30m
    • 15:00 → 16:00
      CMB-S4 Overview Part 2 1h
      Overview 2 slides
    • 16:00 → 17:00
      Junior Scientist Advancement Committee Plenary 1 1h

      Convener: Sara Simon (Fermilab)

      • Optimization and Quality Assessment of Baryon Pasting for Intracluster Gas using the Borg Cube Simulation 15m

        Synthetic datasets generated from large-volume gravity-only simulations are an important tool in the calibration of cosmological analyses. Their creation often requires accurate inference of baryonic observables from the dark matter field. I will present an investigation on the effectiveness of a baryon pasting algorithm in providing precise estimations of three-dimensional gas thermodynamic properties based on gravity-only simulations. This analysis is performed using the Borg Cube, a pair of simulations originating from identical initial conditions, with one run evolved as a gravity-only simulation, and the other incorporating non-radiative hydrodynamics. Matching halos in both simulations enables comparisons of gas properties on an individual halo basis. This comparative analysis allows us to fit for the model parameters that yield the closest agreement between the gas properties in both runs. We find that the investigated algorithm, utilizing information solely from the gravity-only simulation, achieves few-percent accuracy in reproducing the median intracluster gas pressure and density, with a scatter of approximately 20%, for cluster-scale objects up to z=2. These results constitute a first step towards the implementation of a systematic baryon pasting pipeline for gravity-only simulations produced using the HACC solver, which will help provide state of the art multi-wavelength synthetic datasets for cluster cosmology.

        Speaker: Florian Keruzore (Argonne National Laboratory)
        keruzore_jsac_s42023.pdf
        Video Keruzore
      • Cosmology from Cross-Correlation of ACT-DR4 CMB Lensing and DES-Y3 Cosmic Shear 15m

        Weak gravitational lensing of the Cosmic Microwave Background (CMB) and galaxies is a clean probe of the total matter in the universe as it probes the baryonic and dark matter. The matter that gravitationally lenses galaxies, which are at lower redshifts than the CMB, also contributes to the lensing of the CMB, but with different weighing. Resultant cross-correlation between the CMB weak lensing and weak lensing of galaxies offers a way to put robust constraints on the cosmological and astrophysical parameters that are immune to certain systematics affecting either survey. We measure the angular power spectrum between the weak lensing convergence map provided by the Atacama Cosmology Telescope (Data Release-4 data) and the weak lensing shear map by Dark Energy Survey (Year-3 data). We use the angular power spectrum measurement, which passes specific null tests, to constrain the density of the matter and the amplitude of the fluctuations in the matter distribution. In the modelling, we consider and marginalise over nuisance parameters of the photometric uncertainty, multiplicative shear bias and intrinsic alignment of galaxies.

        Speaker: Shabbir Shaikh (Arizona State University)
        Cosmology from Cross-Correlation of ACT-DR4 CMB Lensing and DES-Y3 Cosmic Shear
        Video Shaikh
      • Continuity of Magnetic Fields across Spatial Scales in Star Formation 15m
        Speaker: Paul Williams (Lawrence Berkeley National Laboratory;)
        Continuity of Magnetic Fields across Spatial Scales in Star Formation
        Video Williams
        Williams-JSAC-Mon.pdf
      • Constraining isotropic polarisation rotation with BICEP3 15m
        Speaker: Clara Vergès (Harvard University;)
        S4_IPR.key
        S4_IPR.pdf
        Video Verges
    • 17:00 → 18:00
      Reception 1h
    • 18:00 → 20:00
      Governing Board Meeting 2h

      Closed meeting of the Governing Board
      Kavli 3rd floor conference room

  • Tuesday, 1 August
    • 08:30 → 09:00
      Coffee 30m
    • 09:00 → 10:30
      Plenary Science: Inflation
      Clusters/SZ plenary
      Video Osten, Menanteau
    • 10:30 → 11:00
      Coffee & Group photo 30m
    • 11:00 → 12:00
      Plenary Science: Transients
      Clusters/SZ plenary
      Video Osten, Menanteau
    • 12:00 → 13:00
      Lunch/Junior Lunch 1h

      Kavli 3rd floor auditorium & Parallel #4 zoom line

    • 13:00 → 14:30
      Parallel Work Time
      • 13:00
        Galactic Science Parallel 1h 30m

        Brainstorming and outlining for the Galactic science portion of the new Science Book.

        • Discussion of PySM Models 20m
          Speaker: Giuseppe Puglisi (University of Rome Torvergata)
        • Galactic Science in the next Science Book 1h 10m

          Discussion and outlining

      • 13:00
        Inflation Parallel 1h 30m

        Three talks and discussion of the new inflation chapter of the science book.

        • EPTA results and implications for early Universe physics 15m
          Speaker: Delphine Perrodin (Cagliari Observatory)
          EPTAresultsCOSMO.pdf
        • Forecasting Constraints on fNL Through μ-distortion Anisotropy 15m
          Speaker: David Zegeye (University of Chicago)
          s4_2023_mu_T.pdf
          s4_2023_mu_T.pptm
        • Inflation in the Science Book (v1) 15m
          Speaker: Raphael Flauger (UC San Diego)
          230801_Parallel.pdf
        • Brainstorming and outlining of the inflation science portion of the new Science Book 45m
          Speaker: Dominic Beck (Stanford University;)
          Charge
          Notes
      • 13:00
        Large Scale Structure Parallel 1h 30m

        Convener: Simone Ferraro (LBNL). Three talks and discussion of the new LSS chapter of the science book.

        • Cosmology from unWISE x CMB lensing 10m
          Speaker: Gerrit Farren (University of Cambridge)
          unWISE_pres_slides.pdf
        • CMB lensing cross-correlations on large scales: a clean probe of primordial non-Gaussianity 10m
          Speaker: Alex Krolewski (Perimeter Institute/Waterloo)
          DESI_fnl_from_CMB_cross_quasars_CMBS4.key.pdf
        • Cosmology with Quaia quasars: first results and prospects 10m
          Speaker: Giulio Fabbian (CCA)
          quaia_cmbs4 (1).pdf
        • Brainstorming and outlining of the LSS science portion of the new Science Book 1h
          Speaker: Simone Ferraro (Lawrence Berkeley National Laboratory)
          LSS chapter discussion
    • 14:30 → 15:00
      Coffee 30m
    • 15:00 → 16:00
      Collaboration Social and Scientific Values 1h
      Video Values
    • 16:00 → 16:20
      DOE funding opportunities 20m
      Speaker: Bryan Field (Department of Energy)
      2023 CMB-S4 Collaboration Meeting (Field).pdf
      Video Field
    • 16:30 → 17:30
      LSST camera tours 1h

      There are two 30-minute tours (5-5:30p and 5:30-6p). We will depart Kavli 51 at 4:40p and 5:10p for each tour. It is a 15-20 minute walk from Kavli 51 to IR2.

      Sign up sheet: https://docs.google.com/spreadsheets/d/1wCNRpDa04yKX7BOcd_PepcD1xPH6lvHcMmVdp01zI7s/edit#gid=0

    • 18:30 → 19:30
      EPO Event - Mysteries of the Universe & Time Machines 1h

      Both public and CMB-S4 participants should register at the link below.

      Speaker: Christian Reichardt (University of Melbourne)
      20230801_reichardt_slac_public.pdf
      Event desciption / registration link
  • Wednesday, 2 August
    • 08:30 → 09:00
      Coffee 30m
    • 09:00 → 10:00
      Plenary Science: Galactic Science
      Conveners: Giuseppe Puglisi (University of Rome Torvergata), Michael Busch (University of California, San Diego)
      Clusters/SZ plenary
      Video Osten, Menanteau
    • 10:00 → 10:30
      Fireslides 30m
      Speaker: Susan Clark (Stanford University)
      Fireslides deck
      Video
    • 10:30 → 11:00
      Coffee 30m
    • 11:00 → 12:00
      Plenary Science: Clusters
      Conveners: Srinivasan Raghunathan (University of Illinois at Urbana-Champaign), Boris Bolliet (University of Cambridge)
      Clusters/SZ plenary
      Video Osten, Menanteau
      • 11:00
        From SPT to S4 cluster catalogue and multi wavelength observations 10m
        Speaker: Lindsey Bleem (Argonne National Laboratory)
        Video Bleem
      • 11:10
        From ACT to S4 clusters and ymaps 10m
        Speaker: Will Coulton (Flatiron Institute)
      • 11:18
        Cluster finder and likelihoods 5m
        Speaker: Inigo Zubeldia (University of Cambridge)
        Video Zubeldia
      • 11:23
        Baryon Pasting 10m
        Speaker: Erwin Lau (Harvard)
        Video Lau
      • 11:33
        Projected-field kSZ 5m
        Speaker: Aleksandra Kusiak (Columbia University)
        Video Kusiak
      • 11:38
        kSZ velocity reconstruction 10m
        Speaker: Matthew Johnson (York University and Perimeter Institute)
        Video Johnson, To
      • 11:46
        Clusters x LSS joint analyses and covariance 8m
        Speaker: Chun-Hao To (Ohio State University)
        Video Johnson, To
      • 11:54
        Other topics in SZ science 2m

        relativistic SZ; Joint ymap + cluster; kSZ 2pt and 4pt; rotational kSZ; ultra high-z clusters/proto clusters; ymap cross-correlations (partly covered in Fiona McCarthy's talk)

        Speakers: Srinivasan Raghunathan (University of Illinois at Urbana-Champaign), Boris Bolliet (University of Cambridge)
    • 12:00 → 13:00
      Lunch/SLAC Lab Tour 1h

      Sign up sheet: https://docs.google.com/spreadsheets/d/1wCNRpDa04yKX7BOcd_PepcD1xPH6lvHcMmVdp01zI7s/edit#gid=0

    • 13:00 → 14:30
      Parallel Work Time
      • 13:00
        BSM & Particle Physics Parallel 1h 30m

        Convener: Marius Millea (UC Davis)

        • Fireslide preview of BSM plenary 10m
        • Towards Fast BSM Physics with Bolt 15m

          The ΛCDM cosmological model has been very successful, but cosmological data makes it clear that extensions are still highly motivated. As the quality of CMB and LSS survey data increases, higher-dimensional model parameter spaces are necessary to make these extensions beyond the concordance model. Performing parameter inference in high dimensions is extremely challenging and is often only feasible when gradient information is available. Einstein-Boltzmann (E-B) solvers are the backbone of cosmological models of the CMB and LSS, and state-of-the-art codes do not provide gradient information. We present Bolt.jl, the first differentiable E-B solver. Bolt automatically supplies gradients with respect to cosmological parameters when the Boltzmann equations are solved. Bolt's use of Julia also lowers the barrier between equations and source code, assisting model builders to make changes fast. We compare Bolt to the standard Boltzmann codes CLASS and CAMB at the level of the matter power spectrum and perturbations. Bolt also makes it possible to account for more flexible model extensions with deep neural networks and can account for unknown physics at the level of differential equation models.

          Speaker: James Sullivan (University of California Berkeley;)
          CMBS4_23_Bolt.pdf
        • Converting dark matter to dark radiation does not solve cosmological tensions 15m
          Speaker: Fiona McCarthy (Cambridge)
          FMcCslides.pdf
        • Discussion and planning of Particle & BSM section of Science Book v2 45m
      • 13:00
        Clusters Parallel 1h 30m

        Convener: Florian Kéruzoré (ANL)

        Notes
        • Questions for plenary speakers 15m
        • Brainstorming and outlining of Science Book v2 Clusters chapter 1h 15m
      • 13:00
        Transients, Time-Domain, and Sources Parallel 1h 30m
    • 14:30 → 15:00
      Coffee 30m
    • 15:00 → 16:00
      Plenary Science: Beyond-the-Standard-Model Physics
      Clusters/SZ plenary
      Video Osten, Menanteau
    • 16:00 → 17:00
      Junior Scientist Advancement Committee Plenary 2 1h

      Convenor: Darcy Barron (New Mexico)

      • Curved sky iterative internal delensing 12m

        I present the low ell BB groups r estimate pipeline on the South Pole Deep Patch, and discuss the map-level iterative lensing reconstruction software on the curved sky, delensalot.

        Speaker: Mr Sebastian Belkner (University of Geneva;)
        DC08pres_final.pptx
        Video Belkner, Zegeye
      • Measuring μ-Distortions from the Thermal Sunyaev-Zeldovich effect 12m

        The thermal Sunyaev-Zel'dovich (tSZ) effect is a spectral distortion of the cosmic microwave background (CMB) resulting from inverse Compton scattering of CMB photons with electrons in the medium of galaxy clusters. The spectrum of the tSZ effect is typically calculated assuming the spectrum of the CMB is a blackbody. However, energy or photon number injection at any epoch after photon creation processes become inefficient will distort the blackbody, potentially leading to a chemical potential or μ-distortion for early injection. These primordial spectral distortions will therefore introduce a change in the tSZ effect, effectively a distortion of a distortion. While this effect is small for an individual cluster's spectrum, upcoming and proposed CMB surveys expect to detect tens of thousands of clusters with the tSZ effect. We forecast constraints on the μ-distortion monopole from the distortion of the tSZ spectrum of clusters measured by CMB surveys.

        Speaker: David Zegeye (University of Chicago)
        s4_2023_mu_sz.pptm
        Video Belkner, Zegeye
      • Charge quantisation, axion strings, and cosmic birefringence 12m

        CMB-S4 will be able to detect or reject the unique pattern of rotation of the polarisation of the CMB radiation induced by string-like topological defects in ultralight axion fields. If detected by CMB-S4, future concepts such as CMB-HD will be able to extract the non-Gaussian information in this rotation pattern to measure the axion-photon coupling, which carries crucial information about the smallest unit of charge in the theory beyond the Standard Model.

        Speaker: Winston Yin
        Charge quantisation, axion strings, and cosmic birefringence short.key
        Video Yin
      • Efficient Modelling of Patchy Cosmic Microwave Background Anisotropies: Anticipated Insights from the CMB-S4 Experiment on the Era of Reionization 12m

        The patchiness in the free-electron distribution during reionization affects the statistics of CMB, leading to patchy B-mode polarization and the kSZ temperature anisotropies. As Stage-4 CMB experiments like CMB-S4 aim to detect the primordial B-mode polarization at large scales and small-scale kSZ temperature anisotropies, this necessitates accurate modelling of patchy reionization. To address this, we have developed a CMB anisotropy evaluation framework, using the photon conserving semi-numerical reionization scheme SCRIPT, that can self-consistently predict CMB observables related to reionization. Our analysis indicates that neglecting the contribution from patchy reionization while modelling the CMB B-mode can bias the tensor-to-scalar power spectrum ratio r by up to 0.56σ. However, employing an EB minimum variance estimator, CMB-S4 might be able to detect the patchy B-mode signal with ≥ 2.3σ confidence level, which can reach ~5.7σ for extreme reionization scenarios, which is an essential step towards unbiased measurement of r. The reionization can also be constrained using kSZ spectrum shape over a range of multipoles which, in turn, can be enabled via techniques like Cross-ILC. We show that using CMB-S4’s kSZ and LiteBIRD's 𝜏 measurements, we can unprecedentedly constrain the reionization duration within a range ∼ 0.21 and the patchy reionization B-mode signal at multipole of 200 within ∼1nK2. These results highlight CMB-S4's potential in unravelling the details of reionization era and as a consequence improving our knowledge of the early universe

        Speaker: Divesh Jain
        Divesh Jain_CMB-S4.pdf
        Video Jain
      • Atomic Dark Sector and Concordance of Cosmological Probes 12m

        In this talk, I will present how atomic dark matter (ADM) can bring concordance to the cosmological parameters measured by different observations. In the ADM model, a fraction of the dark matter is dark protons and dark electrons, that interact with dark photons. If the dark photon temperature today is ~ 0.6 K (about what one expects for light relics that decouple at a very early time), we find that the current data allow 10% or more of the dark matter to be ADM. At such a low temperature, the dark photons only provide weak pressure support to the dark baryons, leading to consequences compatible with the current CMB data but that still slightly suppress the matter power at small scales, easing the S8 tension. If this is the cause for the S8 tension, future CMB experiments, like CMB-S4, will be able to detect the amount of ADM, mostly via the CMB lensing effect.

        Speaker: Fei Ge (UC Davis)
        Atomic Dark Sector and Concordance of Cosmological Probes.pdf
        Video Ge
    • 17:00 → 18:00
      Meeting Dinner 1h
  • Thursday, 3 August
    • 08:30 → 09:00
      Coffee 30m
    • 09:00 → 10:30
      Report Back from Parallels 1h 30m
      Report back slides
      Video Ferraro, Puglisi, Beck, Vieira
      Video Keruzore, Millea, Closeout
      • LSS 15m
        Speaker: Simone Ferraro (Lawrence Berkeley National Laboratory)
      • Galactic Science 15m
        Speakers: Giuseppe Puglisi (University of Rome Torvergata), Susan Clark (Stanford University)
      • Inflation 15m
        Speaker: Dominic Beck (Stanford University;)
      • Transients and Time domain 15m
        Speaker: Joaquin Vieira (University of Illinois at Urbana-Champaign;)
        CMB-S4_collabmtg_sources&transients_reportback_aug2023.pdf
      • Clusters 15m
        Speaker: Florian Keruzore (Argonne National Laboratory)
      • Beyond-the-Standard Model and Particle Physics 15m
        Speaker: Marius Millea (UC Davis)
    • 10:30 → 10:45
      Closeout 15m
      slides
      Video Keruzore, Millea, Closeout
    • 10:45 → 11:45
      Brunch (sandwiches)
    • 11:10 → 13:00
      Stanford lab tours 1h 50m

      Meet outside Kavli building before/at 11:10a to walk over to Marguerite bus stop to take the shuttle to Stanford campus.

      Sign up sheet: https://docs.google.com/spreadsheets/d/1wCNRpDa04yKX7BOcd_PepcD1xPH6lvHcMmVdp01zI7s/edit#gid=0

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