Baryonic effects on dark matter and cosmological probes - How will - - PowerPoint PPT Presentation

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Baryonic effects on dark matter and cosmological probes - How will - - PowerPoint PPT Presentation

Sep 01, 2023 19 likes •542 views

Baryonic effects on dark matter and cosmological probes - How will we get the accuracy required? Matthieu Schaller - Leiden Observatory Movie by R. Crain The EAGLE simulations EAGLE quick introduction 100 3 Mpc 3 simulation with 210 6 M

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Baryonic effects on dark matter and cosmological probes

  • How will we get the accuracy required?

Matthieu Schaller - Leiden Observatory

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Movie by

  • R. Crain
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The EAGLE simulations

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EAGLE quick introduction

  • 1003 Mpc3 simulation with 2×106 M☉

gas mass resolution (SPH).

  • Resolving the warm ISM phase with

the hydrodynamics solver.

  • Sub-grid model for galaxy formation

calibrated to match:

○ The z=0 stellar mass function. ○ The z=0 galaxy mass-size relation. ○ The z=0 BH mass - stellar mass relation.

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Many results

Schaye+15

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A personal favourite

Trayford+16

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Things to improve in the future

Schaye+15 Crain+17

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Get your own EAGLE @ home

McAlpine+16

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Effects of baryons on dark matter

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Halo profiles

Schaller+15

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Halo profiles

Schaller+15

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Halo profiles

Schaller+15

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Halo profiles

Schaller+15

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Does it look realistic?

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What about the dark matter itself?

Schaller+15

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Implication for DM searches

Credit: NASA, Fermi

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Schaller+16

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Constraints assuming a decay channel

Calore+17

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  • Obs. constraints on DM slope?

Newman+13

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Cluster profiles

Schaller+16b

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Total matter profile

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Dark matter profiles

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Self-interacting dark-matter?

Robertson+18

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Or could the analysis be “wrong” ?

Quihan+(in prep)

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Effects on the halo masses

Schaller+15

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Effects on cosmological probes

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Baryon effects

Paillas, MS+2019

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In terms of power-spectrum

Hellwing, MS+2016

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From raw data to cosmology

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Weak-lensing forecast

Sembolini+2014

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Do we need bigger runs?

Thinking of future weak-lensing surveys:

  • Measure some cosmological information on scales down to

~ 1-30 Mpc. Clearly “baryon effects” seen on these scales.

  • “Common wisdom” asks for volume in excess of 300 Mpc.
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Cosmological scales in hydro runs?

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Do we need bigger runs?

Thinking of future weak-lensing surveys:

  • Measure some cosmological information on scales down to

~ 1-30 Mpc. Clearly “baryon effects” seen on these scales.

  • “Common wisdom” asks for volume in excess of 300 Mpc.
  • That asks for particles counts > 45003 ~ 100 billion (@ EAGLE res.).
  • > With EAGLE code that would be >300M CPU hours and 1.3PB of RAM
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Future with the SWIFT code?

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SWIFT principles

  • Fully open-source cosmological simulation software for the

community.

  • Testable, designed to easily manage multiple schemes,

subgrid models, physics problems.

  • Scalable, fast and exploiting the latest hardware using modern

algorithm.

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Under the hood

  • Using task-based parallelism, modern algorithms, better

parallelisation and domain decomposition we get an order of magnitude speed-up over Gadget on representative problems.

  • Leaner memory footprint, faster i/o, more modular, multiple

hydro schemes.

  • Collaboration with computer scientists and industry.
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Task-based parallelism in action

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Some physics

  • Hydro neighbour finding based on regular AMR cell
  • structure. Many flavours of SPH + “GIZMO”.
  • 5th order FMM for gravity with a multipole-mesh method

for periodic gravity.

  • Particles sorted to enhance the vectorization of the code.
  • Activation of work only in the “active” parts of the tree.
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FMM principles

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Planet formation - Tilt of Uranus

Kegerreis+2019

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Cosmological simulations

DM-only simulation. 8003 Mpc3 volume. 15363 particles. 4 computing nodes. 4 days of wall-clock time.

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Same with hydro-dynamics

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Some conclusions

  • Mock observations are crucial to shed light on the nature of dark matter.
  • Constraining baryonic effects (feedback) is crucial to exploit next-generation

cosmology probes.

  • Larger simulation with wider parameter space are a key tool on this path.
  • The SWIFT code enables such simulations.

Come and play with it!

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SPH With Interleaved Fine-grained Tasking Full source code, examples, documentation & tutorials:

www.swiftsim.com @SwiftSimulation

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Example Plot

  • Wow
  • Such
  • Results
  • Colours:

○ Blue: #298BDF ○ Dark Blue: #145289 ○ Orange: #DF4229 ○ Dark Orange: #90382B

Use a text box with 14 pt. Roboto Bold for Captions.

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SWIFT Template

When using this template, you may notice the ‘extra’ image around the edge of the slides. Leave this be -- it avoids things looking weird at the edges of your slides when presenting.

  • Bullet Points
  • Make Slides
  • Great Again