| Speaker: | Haruki Ebina (UC Berkeley) |
|---|---|
| Title: | The Marked Power Spectrum as a Practical Bispectrum Measure |
| Date (JST): | Thu, Jun 11, 2026, 13:30 - 15:00 |
| Place: | Seminar Room A |
| Abstract: |
Modern datasets have the precision necessary to uncover new information by including higher-order, non-Gaussian information into cosmological inference. The marked power spectrum offers access to such information while preserving the structure of two-point correlators. This approach to higher-order statistics has the advantage that many modeling questions can directly benefit from progress already made in standard cosmological analyses using the power spectrum and correlation function, while increasing the data vector size negligibly and retaining much of the degeneracy-breaking power of the bispectrum. A central obstacle to applying any higher-order statistic to real surveys is how it responds to the survey window, and in this talk I will show that the survey geometry effect on the marked power spectrum can be resolved with a treatment analogous to that used for the power spectrum. I will also discuss a restructuring of the marked spectra to isolate higher order information, and shed light on its covariance structure and degeneracy-breaking power. |
