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Cosmic Web 2023 conference @KITP


The Co-evolution of the Cosmic Web and Galaxies across Cosmic Time

Coordinators: Joanne Cohn, Nick Kaiser, Katarina Kraljic, and Dmitri Pogosyan

Date: Feb 6, 2023 - Feb 9, 2023


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Registration deadline is: Jan 8, 2023.
Abstract submission deadline for contributed talks: November 1, 2022.
Registration Fee: $330
Fee Due: Jan 8, 2023
Late Registration Fee: $380
Conference begins (with registration): Feb 6, 2023 at 08:50 am


The cosmic web of the matter distribution in the universe provides the framework for the formation and evolution of galaxies and is fundamental to connect galactic properties to cosmology. This conference will address the effects of the cosmic web upon galaxies and vice versa. The aim is to create both a broad-brush and then, for some aspects, a more detailed, early to late time joint history of the web and galaxies. Indeed, the web reflects what the universe is on intermediate scales, which are informative, both in terms of cosmic evolution and quantity of data. It acts as a dynamically relevant intermediate-density bridge (easier to model) between cosmology and galaxies. It is also the source of all anisotropy, critical for angular momentum acquisition, which is the number two parameter in galaxy formation.

This conference will cover many diverse topics, including:

  • the observational estimation of the cosmic web in surveys at intermediate and low redshift, in 2 and 3D, on large and small scales
  • the web’s cosmic dawn: forecasts for the thermal web at high redshifts, relying on theory and simulations
  • identification of the locus and properties of early galaxies and quasars within the web: source distributions, geometry and topology of ionisation fronts interacting with the web
  • a revised theory of galaxy formation and biasing: dynamics and morphology of galaxies within the web's filamentary flow across cosmic time dynamical signatures and relative effect of merger and interaction history, large-scale inflows and angular momentum transport over stochastic feedback
  • an early-to late-time joint-history of the web and galaxies and its implication for cosmology and the dawn of structure formation, to constrain the equation of state of dark energy and primordial non-Gaussianity, and quantify the influence of modified gravity on the geometry of the large scale structures.


Outline of the 4 days conference

The web is of interest to many scientists working in galaxy formation, cosmology, and large scale structures. However, the reason for its broad appeal (as it is multiscale it affects many processes) is the same reason that makes it difficult to study: there are numerous directions of investigation which interlock in many different ways, each of which is often a rich area of study on its own. The will involve people working at these many different frontiers of understanding of the cosmic web, as outlined above, with overarching goals. The conference will be focused on coming up with a paradigm for co-evolution of the cosmic web and galaxy properties for the purpose of sufficient statistics extraction. The discussion at the conference will involve the interaction of galaxies with their environment across cosmic time, via the dynamical influence of the cosmic web. Some of them will for instance be dedicated to a critical assessment of the specific role of cold flows in the circum-galactic medium. The conference thereby will help to disentangle the relative effects of all these interconnected influences. This will provide a context for the work in the broader workshop.

  • Day one: Observational framework in surveys at intermediate and low redshift, in 2 and 3D, on large and small scales: web components as cosmic probe using varied tracers (galaxies, hot/cold gas etc). Web definition for each tracer/component. Algorithmic overview of the various tracers (as identified and tested during the aforementioned hackathon): pros and cons, on a case by case basis for parameter estimation. Input from experts from outside astrophysics.
  • Day two: The web’s cosmic dawn: forecasts for the thermal web (metals, 21 cm) at redshifts 6-12 relying on theory and simulations. Locus and properties of early galaxies and quasars within the web: source distributions, geometry and topology of ionisation fronts interacting with the web. Predicting the percolation process of these fronts and the persistence of cosmic phase-space structures over cosmic time.
  • Day three: Revised theory of galaxy formation and biasing: constraints on the dynamics and morphology of galaxies within the web's filamentary flow across cosmic time. Galaxy properties include alignments, spins, velocities, quenching, bulge/disk kinematics fraction, and assembly history. Dynamical signatures of cold flows; relative effect of merger/interaction history, large-scale inflows and angular momentum transport over stochastic feedback; secular evolution due to internal perturbations, and nuclear activity; impact for cosmic disc settling.
  • Day four: Synthesis: early- to late-time joint-history of the web and galaxies, in broad brush, and then in more detail, incorporating the work and presentations of the previous days. This paradigm will serve to frame the work during the rest of the workshop. Perspectives/discussion: implication for i) cosmology and the dawn of structure formation, ii) for constraining the equation of state of dark energy and primordial non-Gaussianity, and iii) for studying the influence of modified gravity on the geometry of the large scale structures.

See also the related conference Galaxy Formation and Evolution in the Data Science Era

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Page last modified on October 31, 2022, at 12:09 AM