ELFT HÍRADÓ

[vidakris AT konkoly.hu]

Szemináriumi meghívó / Invitation to a seminar
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CSFK CSI SZEMINÁRIUM / KONKOLY OBSERVATORY SEMINAR

Date: Jun 19 (Thursday) 14:00


Mar Perez (Instituto de Astrofísica de Canarias; Spain)

In the Absence of Matter: What Voids Reveal About the Cosmos

The discovery of the Universe’s accelerated expansion prompted a 
collaborative effort to uncover the source of this acceleration, either 
through the identification of a new form of energy (the so-called dark 
energy) or by considering potential deviations from the general relativity 
theory at larger scales. To better comprehend the driving force behind this 
acceleration, researchers have extensively studied standard cosmological 
probes, such as the Cosmic Microwave Background, Type Ia Supernovae, and 
Baryon Acoustic Oscillations, pushing the boundaries of precision cosmology. 
However, discrepancies between measurements obtained from different methods 
suggest the presence of unaccounted systematic effects or 
yet-to-be-understood physics. In order to validate existing results and 
address systematic effects we need new cosmological probes and cosmic voids 
emerge as one of the most promising new laboratories since their dynamics are 
less affected by nonlinearities, and theories of modif
 ied gravity predict in them more pronounced deviations from our current 
models. In this talk, I will first describe the history of cosmic voids 
studies, followed by forecasts for the Euclid and Roman space telescopes, 
including their cross-correlation with various observables, such as lensing 
effects and angular redshift fluctuations. This multifaceted approach aims to 
improve our understanding of the cosmological landscape and shed light on the 
nature of gravity in extremely under-dense cosmological regions.


https://konkoly.hu/k-szeminariumok

The seminar will be held live in the Detre hall with audience, but also 
streamed online via Zoom. If you are unable to attend the presentation in 
person, you can join us via this link
https://us06web.zoom.us/j/82806911982?pwd=SVZpT0syQ1J6dHBvSkF4N2dXNEQ0dz09
or the meeting ID: 828 0691 1982 and passcode: 206265



Everyone is welcome!

Krisztián Vida, Ramon Brasser
organizers
https://konkoly.hu/k-szeminariumok