The event is the tenth in a series of meetings gathering scientists working on astroparticle physics, cosmology, gravitation, nuclear physics, and related fields. As in previous years, the IWARA2021 meeting sessions will consist of invited and contributed talks, poster sessions, and will cover recent developments in the following topics:

• New phenomena and new states of matter in the Universe
• General relativity, gravitation, cosmology
• New directions for general relativity: past, present and future of general relativity
• FRW cosmologies
• Cosmic microwave background radiation
• First stars, hypernovae, and faint supernovae in the early Universe
• Quantum gravity and quantum cosmology
• Gravity and the unification of fundamental interactions
• Supersymmetry and Inflation
• String theory
• White dwarfs, neutron stars and pulsars
• Black hole physics and astrophysics
• Gamma-ray emission in the Universe
• High energy cosmic rays
• Gravitational waves
• Dark energy and dark matter
• Strange matter and strange stars
• Antimatter in the Universe
• High-energy cosmic neutrinos
• Blazars
• Quantum chromodynamics, nuclear and particle physics and new states of matter in the Universe. Heavy ion collisions and the formation of the quark-gluon plasma in heavy ion collisions and in the first instants of the Universe
• Strong magnetic fields in the Universe, strong magnetic fields in compact stars and in galaxies, ultra-strong magnetic fields in neutron star mergers, quark stars and magnetars, strong magnetic fields and the cosmic microwave background
• Laboratories, observatories, telescopes and other experimental and observational facilities that will define the future directions of astrophysics, astronomy, cosmology, nuclear and astroparticle physics as well as the future of physics at the energy frontiers, and topics related to these.

For more information, please visit the workshop website.

Modern astrophysics is increasingly characterized by large surveys able to identify transient or highly variable sources belonging to many different categories: supernovae, gamma-ray bursts, x-ray binaries, gravitational wave counterparts, flaring stars, novae, tidal distruction events, blazar outbursts, and numerous transients of unknown nature.

Transient phenomena represent unique laboratories of unusual or even extreme physical conditions, often linking together multi-messenger observations. Among the many possible analysis tools, (time-resolved) polarimetry offers the possibility to derive information about geometry, including magnetic field orientation, and physical processes driving the evolution of these events not easily obtainable by other techniques. New observatories have opened up an unprecedented wavelength range for polarimetry, from radio to gamma-ray, providing new insights on the physical processes, and establishing polarimetry as a key capability to exploit the yield of large scale transient surveys.

This workshop aims at bringing together theoreticians, observers, and instrument scientists to review the current state of the art and to enable new collaborations to develop to address open questions that can be addressed via polarimetric studies.

For additional questions, please see the conference website.

Powerful new galaxy surveys Euclid, The Dark Energy Survey, eROSITA and LSST offer outstanding potential for both cluster cosmology and galaxy evolution. With these wide-field surveys across a variety of wavelengths and redshifts, we are moving into an era where samples of hundreds of thousands of galaxy clusters will be available. While these large samples enable the reduction of statistical uncertainties in our measurements, developments in modelling both our observations and theoretical understanding of galaxy clusters is crucial to the success of these surveys. The aim of this meeting is to bring together observers and theorists to discuss recent results and future prospects for deriving cluster masses in light of current and upcoming wide-field surveys.

MEETING THEMES

This will be a small-medium sized meeting with oral and poster contributions alongside discussion sessions covering the following themes:

Theme 1: observational measurements & progress on:

• Galaxy cluster masses derived from galaxies
• Galaxy cluster masses derived from gravitational lensing
• Galaxy cluster masses derived from X-rays
• Galaxy cluster masses derived from the Sunyaev-Zeldovich effect
• Machine learning applications to galaxy cluster mass estimation techniques
(Subthemes are inclusive of multi-wavelength comparisons).

Theme 3: a view from galaxy cluster simulations (dark matter-only, hydrodynamical, synthetic skies etc.).

Theme 4: statistical challenges in galaxy cluster cosmology.

For additional questions, please see the conference website.

• SC A: The Earth's Surface, Meteorology and Climate
• SC B: The Earth-Moon System, Planets, and Small Bodies of the Solar System
• SC C: The Upper Atmospheres of the Earth and Planets Including Reference Atmospheres
• SC D: Space Plasmas in the Solar System, Including Planetary Magnetospheres
• SC E: Research in Astrophysics from Space
• SC F: Life Sciences as Related to Space
• SC G: Materials Sciences in Space
• SC H: Fundamental Physics in Space
• Panel on Satellite Dynamics (PSD)
• Panel on Scientific Ballooning (PSB)
• Panel on Potentially Environmentally Detrimental Activities in Space (PEDAS)
• Panel on Radiation Belt Environment Modelling (PRBEM)
• Panel on Space Weather (PSW)
• Panel on Planetary Protection (PPP)
• Panel on Capacity Building (PCB)
• Panel on Education (PE)
• Panel on Exploration (PEX)
• Panel on Interstellar Research (PIR)
• Panel on Innovative Solutions (PoIS)
• Task Group on Establishing a Constellation of Small Satellites (TGCSS)
• Special events: interdisciplinary lectures, round table, etc.

For additional questions, please see the conference website or contact: cospar[AT]cosparhq[DOT]cnes[DOT]fr

With its ability to detect the characteristics of individual photons, high spatial and spectral resolution and its low-background, the Chandra X-ray Observatory provides unprecedented perspectives of the X-ray universe. In simplest terms, the event list for a single observation is a database of photons; typically with 100,000 rows of data but sometimes up to 50 million. Careful scrutiny, visualization, and comparison to physical models of the event list -- at the heart of Chandra science -- has many similarities to data science. The Chandra community has provided numerous tools and techniques that advance Chandra science. This year's CXC summer science workshop will highlight the science enabled by such contributions.

The scope of this workshop will cover a large range of science topics and the methods that enable them from landmark contributions (DS9, CIAO, XSPEC, etc.) to novel statistical techniques (Bayesian/Poisson statistical methods, machine-learning classification, etc.). We will invite contributions on timing, imaging, and spectroscopy methods applied to Chandra observations of stars, neutron stars, black holes, AGN, galaxy clusters or any other field of X-ray astronomy, in addition to contributions from science enhanced by multi-mission and multiwavelength studies.

The workshop will occur virtually mid-August 2021 (likely dates are 17th-19th and 24th-26th). We will aim to host ~6 days with 3 hours of topical programming per day, including 30 minutes of community building (virtual cafes). Programming will include invited (25-30 minutes), contributed (10-15 minutes), and lightning (3-5 min) speakers and focused panel discussions. Talks will focus on science, but self-organized tutorials outside of these sessions may be considered.

Please contact us at cxcworkshop[AT]cfa[DOT]harvard[DOT]edu with any questions.

Registration and Expression of Interest

Registration is free. However, real-time participation in a given Zoom session will be limited to the first 100 guests for a particular session. A live YouTube stream will be made available and monitored for questions to accommodate overflow participants.

All attendees are expected to abide by the code of conduct for Chandra X-ray Center events.

To register for the meeting and to indicate interest in presenting a talk, please complete the registration form. Full abstracts for selected talks will be requested at a later date.