usable presentation

talking_points.md

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+# Comments for the presentation
+
+
+## Introduction
+
+---
+
+---
+
+
+---
+
+
+// COMMENTS:
+
+
+---
+
+// Explanation
+- further modulation by _RSD_
+
+
+    // From first principles
+    // small scales to resolve sources + sinks + feedback
+    // large scales to capture statistics
+
+        // IF ASKED: difference with `21cmFAST`:
+        // based on excursion formalistm -> only valid >= 1Mpc, which is ideal for large volumes + statistics => 21-cm forecasts
+
+        // interesting to build emulators for instance
+
+
+---
+
+
+// From the xray emission
+// primordial + heating term
+// expansion + deposition by xrays
+// => xrays are assumed to be the only source of heating
+
+
+// $
+//   x_("HII")(r bar M, z) = theta_"H" lr([R_b (M, z) - r], size: #150%)
+// $
+
+---
+
+// COMMENTS:
+// - contribution from the lyman lines
+// - 1/r^2 decrease from spreading photons
+// - more steep outwards + sharp drop due to redshifting out of line
+
+
+---
+
+== Revisiting the 21cm signal
+
+
+---
+
+
+### Procedure
+Painting using all halos that match in a SINGLE step
+
+
+
+---
+
+OVERLAP EXPLICITLY ALLOWED
+
+
+---
+### Postprocessing
+- ionization overlaps
+- corrections due to RSD
+- computation of derived quantities
+- summary statistics
+
+---
+### Maps
+
+---
+
+### Signal
+
+---
+
+## Halo growth
+
+### Motivation
+
+
+
+### Effect on the flux profiles
+
+// COMMENTS
+// That will be directly affect the global signal as well
+// shifting
+//
+// Yu-Siu already investigated the more nuanced effect of stochasticity but the approach we propose should supersede that
+
+
+### Inferring growth from #smallcaps[Thesan] data
+// ideal for rapid iterations
+
+// in a parallelized fashion => want to stay fast
+// fix the original mass for max. consistency
+// fix the allowed dynamic range
+
+// this sort of "breaks the degeneracy" between halos of the same mass but different growth histories
+
+
+---
+
+RESULT OF LOADING:
+// COMMENTS:
+// no clear trend between mass and growth rate
+
+---
+
+## Adaptations
+---
+
+### Central changes
+
+
+// important since the bins are more now
+
+
+// largely through vectorization -> still "native" python
+// usage of HDF5
+// solid caching mechanisms -> resume simulations, etc...
+
+
+### Simplified usage
+
+In a page or less
+
+---
+
+## Results
+### Map outputs
+  // the ones where the accretion rate is likely higher
+
+  // in particular: no values where the coupling has become weaker
+  // will become apparent in the signal as well
+
+
+---
+
+  // those are the ones where the diff vanishes: e.g. top right
+
+---
+
+  // more variation due to the different accretion rates
+
+---
+// Globally:
+// more dynamic range while the mean systematically shifts towards the (biased) lower accretion rates
+
+// Intermezzo - compare with lower alpha range - mostly similar but occasional contributions from higher alpha values
+// => recommend keeping a wide range since it does not affect performance (if the bins are empty anyway)
+// the more intersting discussion to be had is the effect of a more fine binning - thesan data already gives an indication which values will be most frequent
+// => the implementation to test that is there
+
+
+  // the halos themselves produce a stronger singal while the background is usually
+
+
+
+
+---
+
+### Signals
+
+---
+
+## Conclusion
+
+---
+### Summary
+
+  // since it affects the SFR and thus the emissivity
+
+
+  // change in profiles trivially
+
+  // which could in theory be absorbed by shifting other paremeters
+
+  // which we can hope to observe (although many are subtle)
+
+// unique position of 21-cm cosmology -> cannot discuss observational constraints
+
+
+  // invite you to check out
+
+
+### Outlook
+// finally ready for direct comparison with c2ray? now that parameters and loading have been properly implemented
+
+// Assuming other relations related to production of photons is (hopefully by now well motivated) complex
+// these cannot directly be inferred => expressed as a distribution as a function of another halo property
+
+// the scale-up -> large volumes with usable merger trees
+// comitting to reserving some 100s of node hours (which I would still quantify as fast)