Fundamental Physics from Future Spectroscopic Surveys

Session

Session 7

7 May 2024, 13:45

Auditorium (Building 50)

Conveners

Session 7: Inflationary Physics II

• Eva Silverstein

46. Extending the reach of the cosmological collider

Soubhik Kumar (NYU)

07/05/2024, 13:45

Massive field excitations during the inflationary era, imprinted on cosmological correlation functions, can provide us with a unique opportunity to probe heavy degrees of freedom far beyond the reach of terrestrial colliders. In the simplest inflationary models, any such cosmological collider signal is exponentially suppressed for particles much heavier than the inflationary Hubble scale,...

15. Improved Constraints on Local Primordial Non-Gaussianity from Spectroscopic Data with Galaxy Bias

Jamie Sullivan (UC Berkeley)

07/05/2024, 14:00

Local Primordial non-Gaussianity (LPNG) - the most easily measurable signature of inflationary physics from large-scale structures - will be a primary science target for current and future spectroscopic surveys. Maximally extracting information about the amplitude of PNG ($f_{NL}$) will require knowledge of galaxy formation physics, which can robustly be embedded in the values of bias...

29. Constraining local primordial non-Gaussianity using the large-scale modulation of small-scale statistics

Dr Utkarsh Giri (University of Wisconsin-Madison)

07/05/2024, 14:10

We implement a novel formalism to constrain primordial non-Gaussianity of the local type from the large-scale modulation of the small-scale power spectrum. Our approach combines information about primordial non-Gaussianity contained in the squeezed bispectrum and the collapsed trispectrum of large-scale structure together in a computationally amenable and consistent way, while avoiding the...

40. Probing primordial non-Gaussianity by reconstructing the initial conditions with machine learning

Xinyi Chen (Yale University)

07/05/2024, 14:20

Inflation remains one of the enigmas in fundamental physics. While it is difficult to distinguish different inflation models, information contained in primordial non-Gaussianity (PNG) offers a route to break the degeneracy. In galaxy surveys, the local type PNG is usually probed by measuring the scale-dependent bias in the galaxy power spectrum on large scales, where cosmic variance and...

32. Theoretical systematics in Large-Scale Structure Surveys

Charuhas Shiveshwarkar

07/05/2024, 14:30

Large-Scale Structure (LSS) surveys have emerged as a promising avenue to probe the physics of cosmic inflation. Our limited quantitative understanding of the non-linear physics of structure formation poses modelling challenges when interpreting LSS data. In this talk I will give an overview of previous work that investigates some theoretical systematic effects in the context of large-scale...

42. Search for CDM isocurvature with large-scale structure: a forecast for MegaMapper

Mr Sai Chaitanya Tadepalli (Dept of Physics, University of Wisconsin Madison)

07/05/2024, 14:40

Isocurvature perturbations with a blue power spectrum are one of the natural targets for the future large scale structure observations which are probing shorter length scales with greater accuracy. We present a Fisher forecast for the MegaMapper in its ability to detect CDM blue isocurvature perturbations. We construct the theoretical predictions in the EFTofLSS and bias expansion formalisms...

56. Discussion

07/05/2024, 14:50