Cosmic Rhythms

Session

Primordial non-Gaussianity

10 Sept 2026, 11:00

Auditório Ministro João Alberto Lins e Barros (CBPF)

33. SPHEREx Overview and Status

Howard Hui (Caltech)

10/09/2026, 11:00

Oral Talk

SPHEREx, a satellite in NASA’s Medium Explorer program, was launched in March 2025 and is currently conducting the first all-sky near infrared spectral survey from 0.75 to 5 microns. Using linear variable filters mounted on six H2RG detector arrays, SPHEREx obtains low resolution spectra across the entire sky in 102 spectral channels with a resolving power of about 35 to 130. The mission is...

32. The SPHEREx All-Sky Galaxy Catalog: Probing Primordial Non-Gaussianity and Synergy Opportunities

Yun Ting Cheng

10/09/2026, 11:15

Oral Talk

SPHEREx is a near-infrared satellite mission launched in March 2025, currently conducting the first all-sky near-infrared spectral survey. Its primary cosmological objective is to constrain primordial non-Gaussianity through 3D galaxy clustering, using the all-sky galaxy catalog built from SPHEREx high-resolution photometric spectra. This talk will begin with an overview of the SPHEREx...

100. Colliders in the Sky: Constraining High-Energy Physics with CMB and LSS Observations

Oliver Philcox (Stanford University)

10/09/2026, 11:30

Oral Talk

Inflation is amongst the most mysterious phenomena in physics. With an energy scale potentially reaching 10^13 TeV, its physical description likely lies far beyond the realm of the standard model. This leaves many questions unanswered: what fields were present during inflation? how did they interact with each other? In this talk, I will discuss how modern cosmological datasets can be used to...

6. Primordial non-Gaussianity from LSS and its cross-correlations: status and prospects

Dr Jose Bermejo (Konkoly Observatory)

10/09/2026, 11:45

Oral Talk

Measuring the local primordial non-Gaussianity parameter, fNL, is crucial for understanding the nature of inflation, as it can rule out or confirm the various inflationary models. Although the current best constraint on fNL is achieved by the cosmic microwave background (CMB) bispectrum, datasets from large surveys (DESI, Euclid, LSST) are providing this decade another cosmic window to...

23. Primordial non-gaussian bias from the time evolution of tracer number counts

Caio B. de S. Nascimento (Perimeter Institute)

10/09/2026, 12:00

Oral Talk

The presence of additional light fields during inflation can be robustly inferred (or ruled out), if signatures of primordial non-Gaussianity (PNG) of the local type are found (or not found) in upcoming cosmological surveys. In fact, upcoming measurements of the distribution of large-scale structures (LSS) in our Universe will have enough sensitivity to reach important theoretical thresholds...

101. Updates on the Search for Cosmic Topology (COMPACT Collaboration)

Dr Thiago Pereira (Universidade Estadual de Londrina)

10/09/2026, 12:15

Oral Talk

The question of whether our universe is finite or infinite remains an open enigma in cosmology. While most studies assume a spatially infinite universe, statistical anomalies in the Cosmic Microwave Background (CMB) and significant methodological limitations in previous analyses call this assumption into question. In this talk, I will present recent findings from the COMPACT collaboration,...