Activities

Cosmology Seminars

Specialized seminars organized by the cosmology group covering the research interests of the group. Given by invited speakers. Click on the talk title for abstract and further details.

11/03/2026, Probing Parity with Composite-Field Galaxy Correlators (Azadeh Moradinezhad, LapTh) 11:30, 11/03/2026 - Sala de Claustros
Abstract: Detecting parity violation on cosmological scales would provide a striking clue to new physics in late or early Universe. Large-scale structure surveys offer the statistical power required to test such signatures. For scalar observables such as galaxy clustering, the leading parity-sensitive statistic is the trispectrum, whose high dimensionality makes direct measurement and noise estimation challenging. It is therefore desirable to construct lower-dimensional observables that retain sensitivity to parity-violating trispectrum signals. In this talk, I introduce a class of such observables, referred to as parity-odd kurto spectra, which arise as power spectra of composite fields constructed from the galaxy overdensity field. These statistics compress trispectrum information into one-dimensional pseudo–power spectra that can be measured using standard large-scale structure techniques. I present tests of the estimators on N-body simulations and discuss the dominant sources of noise affecting the measurements. Finally, I show results from analyses of BOSS and DESI galaxy samples using parity-odd kurto spectra and compare them with recent trispectrum analyses of the same datasets.
08/04/2026, TBD (Boryana Hadzhiyska, Cambridge University) 11:30, 08/04/2026 - Sala de Claustros
Abstract: TBC
22/04/2026, Novel results in perturbation theory for LSS (Henrique Rubira, LMU and Cambridge University) 11:30, 22/04/2026 - Sala de Claustros
Abstract: Major improvements in the theoretical understanding of LSS have been possible due to the effective field theory approach. After an overview of the perturbation theory applications for LSS, I will discuss how to go beyond the one-loop calculation, presenting novel two-loop results and their information content (both for clustering and lensing). I will also show how to extract information from higher-loop orders using renormalization group equations.
06/05/2026, TBD (Martinne Lokken, IFAE) 11:30, 06/05/2026 - Sala de Claustros
Abstract: TBC

Master Seminars

Seminars part of the Master in Particle Physics and Physics of the Cosmos of the University of Cantabria and International University Menéndez Pelayo, coordinated by IFCA. Broader topics and treated at an introductory level. We only list here those related with cosmology. Click on the talk title for abstract and further details.

06/02/2026, Black hole echoes and boundary effective field theory (Subodh Patil, Leiden University) 12:00, 06/02/2026 - Sala de Claustros
Abstract: The idea that black holes may not have purely infalling boundary conditions at the horizon has a range of theoretical and phenomenological motivations. The inevitable result is that any post-merger ringdown will exhibit echoes. Given the fact that boundary conditions in any field theory can be implemented via a so-called boundary effective action, we first offer a pedagogical review of the reformulation of the problem in terms of a stretched horizon effective field theory. Doing so allows us to specify what is strictly observable, and relate so-called reflection coefficients directly to the scales associated with various boundary operators. This allows us to quantify the deformation of GR required near the horizon to produce such echoes (and whether one finds this plausible). We also find an unavoidable feature: an induced mode dependence for the reflection coefficients that traces to the non-locality of the boundary action generated under RG flow. In order to demystify the physics of non-local boundary effective actions, we show that the same thing happens in electrostatics (!) which also allows us to distill features specific to horizons. We conclude with a discussion of how our findings can inform future searches, and how a putative no-go theorem for the black hole echoes is evaded. N.B. The work presented in this talk was done in collaboration with a number of master's students at Leiden, and a number of interesting topics for master's research projects will be summarized at the end of this talk.
13/02/2026, Cosmology and Supernovae through Cosmic Lenses (Sherry Suyu, TUM) 11:00, 13/02/2026 - Sala de Claustros
Abstract: Strongly lensed supernovae (SNe) are emerging as a new probe of cosmology and SNe. When a SN is strongly lensed by a foreground galaxy, multiple images of the SN will appear around the foreground galaxy at different times. Current and upcoming surveys including Euclid and the Rubin Observatory Legacy Survey of Space and Time will capture hundreds of strongly lensed SNe, expanding the existing sample by two orders of magnitude. These events offer excellent opportunities to: (1) measure the Hubble constant via lensing time delays, shedding light on the Hubble tension, and (2) obtain unprecedented constraints on SN progenitors through early-phase spectra. I will give an overview of the first discoveries of lensed SNe and their cosmological implications.
17/04/2026, TBD (Miguel Pérez Torres, IAA) 11:00, 17/04/2026 - Sala de Claustros
Abstract: TBC

Outreach Events

Everyone at the Cosmology group at IFCA is very committed to outreach and share our work and research with every audience. Here you can see the activities organized by and participated directly by our members.

We also participate in the activities organized by IFCA. The IFCA outreach unit is very active, organizing several activities like:

Other activities and news at IFCA are advertised in the social media of IFCA.

Conferences

Recent and upcoming conferences and workshops organized by members of the cosmology group.

Click here to see a list of past conferences and workshops organized by members of the group

XI Meeting on Fundamental Cosmology

18-20 November 2025, Santander Conference webpage




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