[Hadstruct] Lanczos for ground state energy

[Joseph Karpie]

Hey,

I have started testing the Lanczos idea for analyzing 2pt functions. I put basic formula and results into slides https://docs.google.com/presentation/d/1uaQpQhQawA7VGA--2cjqrsSCSPoB6ORvl2M9iQZD4dQ/edit?usp=sharing I'm happy with the results given how roughly they are made. In the plot of evalues, and considering physical evalues must be positive and real, you can tell most of them are garbage. I can explain the dirty filtering procedure I did tomorrow morning. I hope to actually do the more professional diagnostics in a next attempt. Unfortunately without going to longer times, this data doesn't actually reach the regime where the advantage is significant.

Best,
Joe

--
Joe Karpie
Pronouns: He/His/Him
Postdoctoral Fellow
Theoretical and Computational Physics Center
Jefferson Lab

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