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03/06/2024, 09:30
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03/06/2024, 10:00
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03/06/2024, 11:00
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03/06/2024, 11:30
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03/06/2024, 12:00
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03/06/2024, 13:30
The effective field theory of large-scale structure allows for a consistent perturbative bias expansion of the rest-frame galaxy density field. In this work, we present a systematic approach to renormalize galaxy bias parameters using a finite cutoff scale Λ. We derive the differential equations of the Wilson-Polchinski renormalization group that describe the evolution of the finite-scale bias...
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03/06/2024, 14:00
Castorina (moderator): Akitsu, Chen, Ivanov, Matsubara
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03/06/2024, 14:30
One fundamental question in the physics of large-scale structures is how we can trace back the evolution of cosmic structures and reconstruct the initial density field. The universe we observe today is dotted with galaxy clusters separated by vast voids, in sharp contrast to its initial state, which was nearly uniform with only minor density fluctuations. The evolution from this early...
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03/06/2024, 15:30
The cosmic web is the largest geometric structure in our universe, consisting of an intricate network of empty voids bounded by thin walls, elongated filaments, and dense clusters. Given the array of upcoming cosmological redshift surveys, new analytic tools are needed to study the formation of the various structures, quantify the geometry and topology, and isolate the elements of the cosmic...
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03/06/2024, 16:00
Analytical models of structure formation routinely assume that dark matter halos form from peaks of the initial density field, smoothed with some spherically symmetric filter. This works reasonably well for identifying the center of mass of protohaloes, but gives no information about their shapes. To provide a more realistic description of protohalo boundaries, one must go beyond the spherical...
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03/06/2024, 16:30
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04/06/2024, 09:00
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04/06/2024, 09:30
Motivated by demanding a fast algorithm of cosmic statistics to tackle extremely large data sets from ongoing and upcoming galaxy surveys, we make the first release of Hermes (HypER-speed MultirEsolution cosmic Statistics), an open-source parallel/GPU-accelerated Python package. The core algorithm implemented in the Hermes Python package is based on the MRA-CS (MultiResolution Analysis -...
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04/06/2024, 09:47
We present CLASS-OneLoop, a numerical tool fully integrated into the Boltzmann code CLASS, enabling the calculation of the one-loop power spectrum of biased tracers in redshift space following the EFTofLSS. We first summarise the theoretical modelling and the expansion formalism used in the code. We then show that an MCMC fit to spectrum wedges measured from the AbacusSummit suite with...
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04/06/2024, 10:17
In this follow-up talk, we provide details on the CLASS-OneLoop module: overall structure, input options, estimated accuracy, validation against CLASS-PT, algorithms and strategies for efficient loop integrals, and overall performances.
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04/06/2024, 11:04
Cosmological simulations provide a powerful framework for investigating the non-linear growth and evolution of large-scale structure (LSS) in the Universe. This research addresses the challenges of understanding how large scale structure is affected by both cosmology and astrophysics with the aim of making precise predictions of observables such as the cosmic shear and galaxy clustering for...
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04/06/2024, 11:21
Previous studies of galaxy formation have shown that only 10 per cent of the cosmic baryons are in stars and galaxies, while 90 per cent of them are missing. In this talk, I will present three observational studies that coherently find significant evidences of the missing baryons. The first is the cross-correlation between the kinetic Sunyaev-Zeldovich maps from Planck with the linear...
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04/06/2024, 11:38
Emulators are becoming increasingly important in performing Bayesian inference for current and upcoming cosmological surveys. I will discuss the hybrid Lagrangian bias expansion model in real space, a nonlinear bias model able to describe galaxy clustering to very small scales (~0.7 h/Mpc) and its corresponding emulator implementation in the emulation suite baccoemu. I will also quickly review...
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04/06/2024, 12:08
The intrinsic alignment of galaxies is an important ingredient for modelling weak-lensing measurements, and a potentially valuable cosmological and astrophysical signal. In this talk, I will present HYMALAIA: a new model to predict the intrinsic alignments of biased tracers. HYMALAIA is based on a perturbative expansion of the statistics of the Lagrangian shapes of objects, which is then...
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04/06/2024, 13:38
Hybrid models use the displacement field generated by N-body simulations to precisely forecast structure formation. The distribution of galaxies is then computed employing a bias expansion technique rooted in the symmetries of galaxy formation physics. This methodology has demonstrated its ability to yield unbiased cosmological constraints across various investigations. Nonetheless, it...
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04/06/2024, 14:08
Surveying the large-scale structure of the universe will yield an enormous amount of high-quality data for constraining cosmology and potentially detecting new physics. Extracting the maximum amount of information from this dataset and using it to its full potential requires fast and accurate cosmic structure formation simulations. N-body simulations deliver a high level of accuracy but are...
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04/06/2024, 14:25
The forthcoming high-quality data from the next generation of galaxy surveys promises powerful new tests of cosmology. However, fully realizing this potential poses new challenges in theoretical modeling and analysis. Novel analysis techniques are required to maximize the cosmological information extracted from the data while remaining robust to theoretical uncertainties in the small-scale...
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04/06/2024, 15:30
I will talk about the field-level inference of galaxy clustering with perturbative forward modeling, focusing on the information content beyond the power spectrum. I may also discuss the equivalence (and possible difference) of biasing scheme in the polyspectra and the field-level.
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04/06/2024, 16:00
Peacock (moderator): Conley, Hall, Kokron, Pellejero, Stadler
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04/06/2024, 16:30
Neveux (moderator): Aviles, D'Amico or Zhang, Lesgourgues, Philcox, Zennaro
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05/06/2024, 09:00
Any new dynamics at low-redshift must be properly included in the perturbative solutions of the matter fields and in galaxy bias. In this talk, I will give some examples of how new physics in the dark matter sector changes the structure of the perturbative kernels, introduce new counterterms in the EFT and new galaxy bias parameters.
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05/06/2024, 09:30
In this talk, I will present recent developments in perturbation theory regarding the study of the large-scale clustering of galaxies in theories with scale-dependent linear growth, such as those involving massive neutrinos and modified gravity. The challenge in these models is that the introduced scale is incorporated into the perturbative kernels. We utilize the Lagrangian approach to...
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05/06/2024, 10:00
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05/06/2024, 11:00
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05/06/2024, 11:30
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05/06/2024, 12:00
Local Primordial non-Gaussianity (PNG) will be a primary science target for galaxy clustering analyses using SPHEREx, DESI, and Euclid data. Maximally extracting information about the amplitude of PNG (f_{NL}) will require knowledge of galaxy formation physics, which can robustly be embedded in the values of bias parameters in large-scale perturbative models. I will describe several...
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05/06/2024, 13:30
Carrilho (moderator), D'Amico or Zhang, Tsedrik, Sullivan
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05/06/2024, 14:00
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05/06/2024, 14:30
The weak lensing convergence probability distribution function (PDF) has proven to contain valuable information for improving the constraints on cosmological parameters. The convergence PDF can be easily measured from simulated and observed mass maps and can be modelled with high accuracy on mildly non-linear scales. In this work we investigate the constraining power of the convergence PDF...
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05/06/2024, 15:30
We study the performance of the perturbative bias expansion when combined with the multi-tracer technique, and their impact on the extraction of cosmological parameters. We consider two populations of tracers of large-scale structure and perform a series of Markov chain Monte Carlo analysis for those two tracers separately. The constraints in ωcdm and h using multi-tracer are less biased and...
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05/06/2024, 16:00
There are several effects which distort the observed clustering of galaxies. By far the best known are redshift-space distortions. In this talk I will discuss another, more subtle effect - the effect of gravitational redshift on large-scale structure. The impact of this non-kinematic effect is suppressed relative to RSD in the auto-correlations and is best probed in the odd multipoles of the...
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05/06/2024, 16:30
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Please pick up name tag at reception and check in before heading to lecture hall. Lecture hall is about a 5 minute walk away.
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