Jelena Aleksic
(IFAE), Joern Lange
(IFAE Barcelona), John E Ward
(IFAE)
Description
For nearly a century, we’ve known that our Universe is expanding, and that the distance to a galaxy determines its average apparent recessional speed from us. But on top of that is an additional motion - a peculiar velocity - caused by the local gravitational field of the Universe. When we look at the motion of our own galaxy, we see it’s moving about twice as fast in one direction as the attractive masses would allow. The “Great Attractor” as a source of our motion represents a longstanding puzzle in cosmography. Underdense regions, however, where there’s less mass and gravity than average, can serve as an effective repeller, failing to attract other matter just as much as overdense regions can attract it. Thanks to a newly mapped cosmic void, we might finally understand how our galaxy is moving through the Universe. In this talk, I will introduce the so-called “Dipole Repeller” and discuss implications for cosmological inference at large scales.
Participants
Abelardo Moralejo
Andrea Toldrà
Bruno Bourguille
Chihaya Anzai
David Vázquez Furelos
Emanuele Cavallaro
Federico Sanchez
Gloria De la Rosa
Javier Rico
Joaquim Palacio Navarro
Joern Lange
Juli Mundet
LAURA CABAYOL GARCIA
Lluïsa-Maria Mir
M Martinez
Machiel Kolstein
Matteo Cavalli-Sforza
Matthias Jamin
Oscar Blanch Bigas
Pere Gonzalez
Pere Masjuan
Pilar Casado
Rafel Escribano
Raimon Casanova
Ramon Miquel
Sara Strauch
Thorsten Lux
13:00
→
13:05
Introduction and General Announcements5m
Speakers:
Joern Lange
(IFAE Barcelona), DrJohn E Ward
(IFAE), DrStefano Terzo
(IFAE)