|
Cosmology Seminar & Cosmology Club Organizers: Włodzimierz Piechocki,
Eryk Infeld, Agnieszka Pollo,
Lech Szymanowski |
We meet on Wednesday at
THE
COMING MEETING:
COSMOLOGY SEMINAR
Department of Theoretical Physics
Institute for Nuclear Studies
February 10 (Wednesday),
INS pavilion, lecture room 22, Hoza 69
Krzysztof Bolejko
Nicolaus
Copernicus Astronomical Center,
Bartycka,
Warszawa
Lecture
Testing homogeneity of the Universe with luminosity and age data
Abstract
|
It is generally assumed
that the Universe is homogeneous at large scales and that it can be described
using Friedmann models. So far this assumption has
served well and led to a good understanding of many features of our Universe.
However, we should not forget that homogeneity is indeed an assumption that
should eventually be checked against observations. Because of our fixed
position in the Universe, there are two distinct aspects to
homogeneity-isotropy about our position, and uniformity with distance from
us. Isotropy is relatively easy to check, but radial homogeneity has many
intrinsic complications. The assumption of homogeneity is so pervasive, and
underlies so much theoretical and observational work, that there is a real
danger of a circular argument. Consequently, any proof of homogeneity must ensure
it does not rely on results obtained using an assumption of homogeneity. Checking
that the distribution of matter is homogeneous, while still using the Friedmann model, is at best a consistency check and not a
proof. A genuine proof must therefore allow both the geometry and the matter
to be inhomogeneous. During my talk I will present how the assumption of
homogeneity can tested using luminosity and age data. The constraints from
the available data will also be discussed. |
|
Date |
Speaker |
Title |
|
20.01.2010 |
Jerzy
Kowalski-Glikman |
The fate of Lorentz symmetry at Planck scale |
|
16.12.2009 |
Karol Życzkowski |
Quantum entanglement and average correlations between random subsystems |
|
09.12.2009 |
Ewa
L. Łokas |
Masses of
dwarf galaxies in the Local Group |
|
25.11.2009 |
Bożena
Czerny |
Active Galactic Nuclei: are
they important? |
|
18.11.2009 |
Paweł Haensel |
Equations of state of dense
matter: Neutron stars and supernovae |
|
21.10.2009 |
Jakub Mielczarek |
Astrophysical constraints for
the quantum gravity effects |
|
23.06.2009 |
Andrzej Borowiec |
Extended
gravity and cosmology a la Palatini |
|
09.06.2009 |
Włodzimierz Kluźniak |
Transparency
of the Universe to TeV photons |
|
19.05.2009 |
Krzysztof Katarzyński |
Correlation
between X-ray and TeV emission of blazars |
|
05.05.2009 |
Marek Kutschera |
Realistic
Cosmology |
|
28.04.2009 |
Michał Jaroszyński |
Gravitational
lensing and dark energy |
|
21.04.2009 |
Krzysztof Meissner |
Some unsolved
problems in particle physics and cosmology |
|
07.04.2009 |
Bogusław Broda |
Dark Energy
from Quantum Vacuum Fluctuations |
|
10.03.2009 |
Marek Biesiada |
On some extragalactic tests of Lorentz
Invariance Violating theories |
|
03.03.2009 |
Leszek Roszkowski |
Dark matter in supersymmetric models – a statistical approach |
|
17.02.2009 |
Leszek Sokołowski |
Metric nonlinear gravity theories and their applications to
cosmology |
|
03.02.2009 |
Tomasz Bulik |
Astrophysical limits on the dependence of the speed of light on the wavelength |
|
20.01.2009 |
Michał
Heller |
Noncommutative
Friedman World Model |
|
06.01.2009 |
Krzysztof Bolejko |
Inhomogeneous
Cosmological Models as
Alternatives to Dark Energy |
|
09.12.2008 |
Iwo Białynicki-Birula |
Born-Infeld Electrodynamics |
|
25.11.2008 |
Andrzej Królak |
Prospects of
detection of gravitational waves |
|
18.11.2008 |
Marcin Sokołowski |
Broadband
observations of the naked-eye GRB080319B |
|
28.10.2008 |
Michal Ostrowski |
High energy
gamma ray astronomy - H.E.S.S. experiment |
|
14.10.2008 |
Agnieszka Janiuk |
Gamma ray
bursts from collapsing massive stars |
|
30.09.2008 |
Jerzy
Kowalski-Glikman |
Quantum Gravity
and Doubly Special Relativity |
|
19.08.2008 |
Stanisław Zoła |
Two supermassive black holes in OJ287 |
|
08.07.2008 |
Tadeusz Wibig |
End to the
cosmic ray spectrum? |
|
10.06.2008 |
Zygmunt Lalak |
Supersymmetric
Inflation |
|
29.04.2008 |
Jakub Mielczarek |
Gravitational
waves creation during the Big Bounce |
|
08.04.2008 |
Stanisław Bajtlik |
Shape of the
Universe and the Dark Energy Problem |
Autor strony: Przemysław Małkiewicz