Fundamental Physics from Future Spectroscopic Surveys

Session

Session 9

8 May 2024, 08:30

Auditorium (Building 50)

Conveners

Session 9: Late Time Physics

• Simone Ferraro

4. Kinematic Lensing with the Dark Energy Spectroscopic Instrument - Probing S8 Tension at Very Low Redshift

Jiachuan Xu (The University of Arizona)

08/05/2024, 08:30

We explore the science prospects of a 14,000 deg${}^2$ Kinematic Lensing (KL) survey with the Dark Energy Spectroscopic Instrument (DESI) and overlapping imaging surveys. KL infers the cosmic shear signal by jointly forward modeling the observed photometric image and velocity field of a disk galaxy. The latter can be constrained by placing multiple DESI fibers along the galaxy major and minor...

23. Late Time Modification of Structure Growth and the S8 Tension

Dr Meng-Xiang Lin (University of Pennsylvania)

08/05/2024, 08:40

The $S_8$ tension between low-redshift galaxy surveys and the primary CMB signals a possible breakdown of the $\mathrm{\Lambda }$CDM model.
Recently differing results have been obtained using low-redshift galaxy surveys and the higher redshifts probed by CMB lensing, motivating a possible time-dependent modification to the growth of structure.
We investigate a simple phenomenological model in which...

28. A new method to determine $H_0$ from cosmological energy-density measurements

Alex Krolewski

08/05/2024, 08:50

We introduce a new method for measuring the Hubble parameter from low-redshift large-scale observations that is independent of the comoving sound horizon. The method uses the baryon-to-photon ratio determined by the primordial deuterium abundance, together with Big Bang Nucleosynthesis (BBN) calculations and the present-day CMB temperature to determine the physical baryon density $\Omega_b...

27. Large-scale structure and new physics at the eV scale

Prof. Francis-Yan Cyr-Racine (University of New Mexico)

08/05/2024, 09:00

Ongoing and future spectroscopic surveys have prime sensitivities to comoving scales that became causal when the temperature of the Universe was in the ~1-100 eV regime. As such, these data are key to probing part of the so-called LambdaCDM `desert’ between e+e- annihilation and matter-radiation equality. This apparent desert has recently received renewed attention in light of possible...

12. Cosmology from the matter power spectrum peak

Dr David Parkinson (KASI)

08/05/2024, 09:10

The position of the peak of the matter power spectrum is a different kind of standard ruler, with a scale set by the horizon size at the epoch of matter-radiation equality. It can easily be predicted in terms of the physics of the Universe in the relativistic era, and so used as a standard ruler independently of other rulers, such BAO. However, it requires a very large effective volume to be...

30. Wide-angle effects in full-sky surveys

Mr Joshua Benabou (University of California, Berkeley / Lawrence Berkeley National Lab)

08/05/2024, 09:20

Current and upcoming redshift surveys will measure the galaxy distribution over an increasing volume, probing interesting physical effects that become important on large physical scales. In particular, the local primordial non-Gaussianity $f_{\mathrm{N}\mathrm{L}}$ will be measured to $\mathcal{O}(1)$ precision with SPHEREx, which will allow us to distinguish between multi-field and single-field models of...

31. Non-perturbative method for modeling the wide-angle effects in the power spectrum

Chen Heinrich (Caltech)

08/05/2024, 09:30

The three-dimensional galaxy power spectrum is a powerful probe of primordial non-Gaussianity and additional general relativistic effects, which become important on large scales. At the same time, wide-angle (WA) effects due to differing lines-of-sight (LOS) on the curved sky also become important with large angular separation. In this work, we accurately model WA and Doppler effects using the...

57. Discussion

08/05/2024, 09:40