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Early Dark Energy and the BAO Matt Francis (SISSA) with Eric - PowerPoint PPT Presentation

Apr 03, 2023 •224 likes •330 views

Early Dark Energy and the BAO Matt Francis (SISSA) with Eric Linder (LBNL) Early Dark Energy Can arise for instance in quintessence models with attractor solutions and coupled dark energy models Even percent levels of e could have a

  1. Early Dark Energy and the BAO Matt Francis (SISSA) with Eric Linder (LBNL)

  2. Early Dark Energy ● Can arise for instance in quintessence models with attractor solutions and coupled dark energy models ● Even percent levels of Ω e could have a significant impact on BAO (and other) measurements ● Previous work (Linder and Robbers 2008) found ignoring EDE would lead to significantly biased BAO measurements of w ● On the other hand, EDE has relatively mild impact on non- linear structure formation, comparable to late time DE models (Francis, Lewis and Linder 2008, Grossi & Springel 2008)

  3. Non Linear Effects on the BAO? ● How do the changes in the non-linear growth in EDE models affect our ability to infer cosmology from the BAO? ● Two possible problems ➢ The original peaks are shifted, and non-linear distortion is scale dependent ➢ Unlike conventional late time DE models, the early universe does not have a common heritage with Λ CDM. EDE may be imprinted in a different non-linear distortion of the BAO scale

  4. N-Body Simulations ● Reference Λ CDM simulation and two EDE sets, one utilizing the Λ CDM initial linear power and the other the correct EDE linear power ● Boxes 1024 Mpc/h on a side with 512 3 dark matter particles ● Set Ω e = 0.05 using parametrization of Doran & Robbers 2006

  5. DM Power Spectrum z=1

  6. Ratio to Λ CDM z=1 z=1

  7. Recovering the BAO scale ● Divide the power spectrum smooth z=1 reference ● Fit for the shift α and a non-linear damping envelope.

  8. α fits

  9. EDE and α ● When the linear power spectrum is unchanged from Λ CDM, difference in shift is negligible; non-linear structure formation history of EDE has little effect ● When the input linear peaks are shifted by EDE, the recovered scale is altered compared to Λ CDM, but by a very small amount, ∆α ~ 10 -3 at z=1 ( verified in 4 different realizations)

  10. Summary ● The evidence suggests the BAO scale is robust against additional non-linear effects from EDE ● Examined the DM power spectrum; need improved resolution and more realistic mock survey analysis

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