Cosmological Observables: Cambridge-LMU Cosmology Meeting

Sitzung

CMB and clusters

29.09.2026, 09:30

Ryle room (Kavli Cambridge)

97. Emilie Hertig

29.09.26, 09:30

Large-scale B-mode polarization of the cosmic microwave background (CMB) is a prime target for current and future experiments in search of primordial gravitational waves (PGW). With increasingly sensitive instruments being deployed, secondary B-modes induced by the weak gravitational lensing of CMB photons are becoming an important limitation and need to be mitigated. My talk will cover the...

98. Piervittorio Conti

29.09.26, 09:50

Galaxy cluster cosmology has proven to be a reliable probe not only for standard LCDM models, but also for testing gravity and modified physics. In this talk, I present my work on a Growth-Geometry split of the matter density parameter (Omega_m) within the context of LCDM, utilizing South Pole Telescope (SPT) and Dark Energy Survey (DES) data. By evaluating which of these two components is...

99. Niall MacCrann - "Probing the epoch of reionisation using the kSZ"

29.09.26, 10:05

The epoch of reionisation is a key epoch in the history of our Universe, during which the first stars and galaxies formed, but it is extremely challenging to observe. Better characterisation of the EoR can reduce uncertainties on cosmological parameters like the neutrino mass. Here I describe how kSZ statistics, in particular the kSZ trispectrum and cross-correlation with CMB lensing, can be...

100. Petar Suman - "Searching for Cosmological Collider Signals in the CMB Data"

29.09.26, 10:25

Recent developments in the cosmological collider programme have highlighted the possibility of probing new particle species present during inflation. In these scenarios, the inflaton couples to additional massive fields whose exchange leaves distinctive imprints in primordial correlation functions. In particular, the bispectrum exhibits characteristic momentum dependence controlled by the...

101. Licong Xu

29.09.26, 10:40

We present a self-consistent joint analysis of the thermal Sunyaev-Zel’dovich (tSZ) power spectrum and cluster number counts (CNC) in which clusters detected above a signal-to-noise (SNR) threshold are masked from the power spectrum and used instead as the CNC sample, so that the two probes act on non-overlapping halo populations. Using synthetic Planck-like data from a halo-painting pipeline,...

128. Matthias Klein - "Turning SZ Candidates into Galaxy Cluster Samples: Pushing Multi-Wavelength Confirmation to Its Limits"

01.10.26, 09:30

Galaxy clusters are sensitive probes of the growth of cosmic structure, but their cosmological power depends on clean samples with well-characterized selection, accurate redshifts, and controlled contamination. I will discuss recent progress and challenges in turning large samples of more than 10,000 ICM-selected candidates into well-controlled galaxy cluster catalogs using multi-wavelength...

129. Ola Kusiak

01.10.26, 09:50

TBC (Simons Observatory Initial Science Observations or projected-fields kSZ)

130. Lena Scheuchl

01.10.26, 10:10

131. Luca Abu El-Haj

01.10.26, 10:25

Particle production is common to many microphysical models of inflation and can imprint observable features in the cosmic microwave background (CMB) anisotropies. Based on arxiv: 2606.26823, 2509.23123, we consider a scenario in which the inflaton couples to an extremely massive field ($m_\chi \gtrsim \mathcal{O}(100 H_I)$, where $H_I$ is the inflationary Hubble scale). In this model, particle...

132. Jack Kwok

01.10.26, 10:40

Galaxy clusters carry angular momentum. If the intracluster gas rotates coherently, the kinetic Sunyaev-Zeldovich (kSZ) effect imprints a dipole on the microwave sky centered on the cluster. We show that microwave maps alone can be used to reconstruct a noisy vector field tracing the projected angular momentum of the ionized gas. In this talk we introduce a simple model for coherent...