ELFT HÍRADÓ

[Zsolt Szep <szepzs AT achilles.elte.hu>]

Tisztelt Kollegak,

Szeretnem figyelmukbe ajanlani a kovetkezo szeminariumot, az eloado alabbi
megjegyzeseivel.

"Figyelmeztetes: a Collegium Budapest kozonsegenek egy jo resze human
erdeklodesu/kepzettsegu, ezert ez inkabb ismeretterjeszto jellegu,
mint szakmailag mely vagy reszletes eloadas lesz, de ezzel egyutt
minden erdeklodot szerettel varok,"

Udvozlettel,
Szep Zsolt

COLLEGIUM  BUDAPEST
Institute for Advanced Study
Szenthromsg utca 2.
H-1014 Budapest
tel: +36 1 2248 301, fax: +36 1 2248 310, email: 
kcsepi AT colbud.hu
http://www.colbud.hu/programme/calendar/

Thursday, 11 December 2008, 11 a.m.   Seminar Room

                                Istvn Szapudi
        (Associate Professor of Astronomy at the Institute for Astronomy,
                        University of Hawaii, U. S. A.)

        "Dark Energy: the Biggest Puzzle of 21-st Century Physics"

Kivonatos ismertetes:

Dark energy cannot be observed directly, its presence can only be deduced
from its effect on the expansion and growth of the universe. Yet, its
existence has already been firmly established by several measurements, and
its contribution to the total energy density
of the universe at present is at the level of 3/4 of the total. The
otherwise extremely successful quantum field theories, which predict Dark
Energy as the energy of vacuum, overestimate its magnitude by 120 orders.
Dr. Szapudi argues that the existence of Dark Energy constitutes the 
biggest puzzle of twenty-first century physics. An interesting opportunity 
for its detection is provided by the integrated Sachse-Wolf (ISW) effect, 
a subtle change of the energy of photons of the Cosmic Microwave 
Background as they fly through the intervening structure ripped apart by 
Dark Energy. He will present their latest ISW analyses using correlations 
between the Cosmic Microwave Background observed by the Wilkinson 
Anisotropy Probe, and the intervening large scale structure traced by the 
Large Red Galaxies in the Sloan Digital Sky Survey.