The third in the International Holography Workshop series is being hosted by us

The latest version of the international workshop entitled All Lambdas Holography @ Prague (All Lambdas in Prague), first organized online in 2021 by CEICO, a young institute under the Institute of Physics of the Czech Academy of Sciences, was held at the Feza Gürsey Center of Boğaziçi University from September 16-19, 2025. https://all-lambda-holography.fzu.cz/

Holography is one of the modern methods used to understand gravity in curved spacetimes. However, this method is only valid for spacetimes containing symmetries that make scales negligible. The most prominent of these are the vacuum solutions to Einstein's equations with cosmic constants, represented by the Lambda symbol. These solutions are the Anti-de Sitter spacetimes with a negative cosmic constant, the Minkowski spacetimes with a zero cosmic constant, and the de Sitter spacetimes with a positive cosmic constant. The entire Lambda family comprises these three spacetimes. Where do these Lambda spacetimes appear in everyday life? They are encountered in various phenomena. The Anti-de Sitter, which corresponds to an acceleratingly collapsing geometry, is encountered when studying the horizons of certain types of black holes. The Minkowski solution represents flat spacetime and plays a role in understanding particle physics. The de Sitter, which describes an acceleratingly expanding universe, helps us in cosmology when considering the primordial universe and the present universe.

Holography is a method first proposed in studies involving the negative lambda individual Anti de Sitter within the family. Shortly afterward, it was realized that this method could also be used for Minkowski and de Sitter, but that it needed to be developed and interpreted from scratch, taking into account the unique properties of each Lambda for each spacetime. Mostly, researchers have focused on and studied a single Lambda signal.

Understanding how generalized holography can be as a method today, and where and how it can reach, is valuable in itself. To this end, creating opportunities for scientists meticulously studying different Lambdas to come together is crucial. With this motivation, when Gizem Şengör suggested at CEICO that they organize a workshop bringing together all Lambdas, using resources from the MSCA-IF project SymAcc, and other researchers at CEICO who are experts in these areas supported this idea, the ALL LAMBDAS HOLOGRAPHY workshops came to life. https://symacc.fzu.cz/

The most recent workshop was held at the Feza Gürsey Center for Mathematics and Theoretical Physics at Boğaziçi University from September 16-19, 2025, under the TÜBITAK BIDED 2232B project (project number 121C138), led by Gizem Şengör, with the participation of CEICO (Czech Republic), KIAS (South Korea), and organizers from Boğaziçi and İTÜ (Istanbul Technical University).

The aim of the workshop was to bring together researchers from different parts of the world, both young and experienced in these fields, and to motivate the exchange of knowledge between as many different Lambdas as possible. This time, renowned researchers from the United States, Brussels, France, India, the Netherlands, and the United Kingdom met with graduate students and postdoctoral researchers from various countries, primarily the Czech Republic, Morocco, Southern Cyprus, Croatia, the UK, Italy, and Turkey. Details of this and previous workshops in the series can be accessed via this link. https://all-lambda-holography.fzu.cz/