São Paulo Research Group meetings in Astro & Cosmo

Next meeting: October 3, 2025

São Paulo, Brazil

Venue: Instituto Principia

Zoom id: 862 0094 6662
Password: cosmo

Home

ICTP-SAIFR is promoting monthly one-day meetings of the São Paulo community working in the related areas of Cosmology/Astrophysics/Astroparticles/Gravity to be held at the Instituto Principia. The idea is to have a light schedule, with a couple of talks and plenty of time for discussion. The main purpose is to explore synergies of the different groups.
The activity will be transmitted online by Zoom.
Next Meetings:
– October 3
– November 28

If you want to receive mailings about the meetings, click HERE.

Organizers:

  • Raul Abramo (IFUSP)
  • Chee Sheng Fong (UFABC)
  • Rogério Rosenfeld (IFT-UNESP)
  • Riccardo Sturani (IFT-UNESP)

 

Announcement:

Invited Speakers

  • 11:15 Pedro Henrique Rossetto (USP): Continuous Gravitational Waves from Neutron Stars Magnetic Mountains

In this presentation, I will discuss the emission of continuous gravitational waves by neutron star mountains. I will begin with an overview of the different mechanisms for forming neutron star mountains and their role in generating gravitational radiation. The focus then shifts to magnetically confined mountains and the process of magnetic field burial. To explain the model, I will introduce the key equations of magnetohydrodynamics that describe this system both in the classical and in the general relativistic paradigms. Numerical solutions of these models will be presented and compared, highlighting the impact of relativistic effects. At the end, I will display the estimates for gravitational wave emission and discuss the possibility for future detectors, such as the Einstein Telescope and Cosmic Explorer, to measure such emissions.

  • 14:00 Joaquin Armijo (USP): Cosmological constraints from the first year data of the Hyper Suprime-Cam

We use Minkowski functionals to analyse weak lensing convergence maps from the first-year data release of the Subaru Hyper Suprime-Cam (HSC-Y1) survey. Minkowski functionals provide a description of the morphological properties of a field, capturing the non-Gaussian features of the Universe matter-density distribution. Using simulated catalogues that reproduce survey conditions and encode cosmological information, we emulate Minkowski functionals predictions across a range of cosmological parameters to derive the best-fit from the data. By applying multiple scales cuts, we rigorously mitigate systematic effects, including baryonic feedback and intrinsic alignments. From the analysis, combining constraints of the angular power spectrum and Minkowski functionals, we obtain S8≡σ8√Ωm/0.3=0.808+0.033−0.046 and Ωm=0.293+0.157−0.043 . These results represent a 40 per cent improvement on the S8 constraints compared to using power spectrum only. Minkowski functionals results are consistent with other two-point, and higher order statistics constraints using the same data, being in agreement with CMB results from the Planck S8 measurements. Our study demonstrates the power of Minkowski functionals beyond two-pointstatistics to constrain and break the degeneracy between Ωm and σ8 .

Previous Meetings

August 29, 2025
  • 11:00 Alexandre Le Tiec (IFT-UNESP — CNRS): What’s in a Name: the Anthropocene – Video
  • 14:00 Fernanda Lima (IF-USP): Ultra-light dark matter and power spectra emulators – Video
  • 15:15 João Ferri (IF-USP): What can we gain from small scales in shear analysis? A comparison between Fourier and Real spaces. – Video
June 13, 2025
  • 10:00 Walter Riquelme (IFT-UNESP): Imprints of Large-Scale Structures in the Anisotropies of the Cosmological Gravitational Wave Background – Video
  • 11:15 Ricardo Medina (UFEI): Determining self-force corrections to the equation of the separatrix of a Schwarzschild black hole – Video
  • 14:00 Gustavo Figueiredo Severiano Alves (IF-USP): Chasing Serendipity: Tackling Transient Sources with Neutrino Telescopes – Video
May 9, 2025
      • 10:00 Pedro Bittar (USP): Baryogenesis just around the corner: Generating the matter asymmetry at or below the weak scale – Video
      • 11:15 Rodrigo Voivodic (Donostia Int. Physics Cent. San Sebastian & IFT-UNESP): Likelihoods – Video
      • 14:00 Gustavo Henrique dos Santos (UFABC): ACT Constraints on Low Scale Inflation and a Mechanism for Vector Dark Matter Production – Video
April 4, 2025

Photos

São Paulo Research Group meetings in Astro & Cosmo

Additional Information

How to reach the Principia Institute: The meeting will be held in the first-floor auditorium of the Science Center at Principia Institute located at Rua Pamplona, 145 near the Trianon-Masp metro station.