Monthly Notes of the Alternative Cosmology Group
– June 2010
Readers may
note changes to the layout and format of the
notes this month. Our appreciation goes to Ian
Tresman who wrote that it was confusing in some
respects, and suggested some improvements.
Hopefully, what follows is more reader-friendly.
Please let me know.
I.
Visit to Greece
ACG founding member Eric Lerner will be visiting
Greece in July, from the 7th to the
27th, and would welcome the
opportunity to meet up with ACG members while he
is there. If you think you might be in a
position to take up Eric’s invitation, please
contact him directly by email at
elerner@igc.org.
II.
Big Bang Theory
1.
Title:
Big Bang? A Critical Review
Authors:
Ashwini Kumar Lal
viXra:
1005.0051
Quote: “This paper
examines a few of the various factors which
undermine the theory of the big Bang, including
the organization of galactic superstructures,
the Cosmic Microwave Background, distant
galaxies, gravitational waves, redshifts, and
the age of local galaxies.”
2.
Title:
Impact on cosmology of the celestial anisotropy
of the short gamma-ray bursts
Authors:
Attila Meszaros,
Lajos G. Balazs,
Zsolt Bagoly,
Peter Veres
arXiv:1005.1558
Quote: “Recently the
anisotropy of the short gamma-ray bursts
detected by BATSE was announced (Vavrek et al.
2008). The impact of this discovery on cosmology
is discussed. It is shown that the anisotropy
found may cause the breakdown of the
cosmological principle.”
3.
Title:
Revisit of Cosmic Age problem
Authors:
Shuang Wang,
Xiao-Dong Li,
Miao Li
Quote: “By
evaluating the age of the universe in the Lambda
CDM model with the observational constraints
from the SNIa, the BAO, the CMB, and the
independent H_0 measurements, we find that the
existence of 5 globular clusters and 1 high-z
quasar are in tension (over 2 sigma confidence
level) with the current cosmological
observations. So if the age estimates of these
objects are correct, the cosmic age puzzle still
remains in the standard cosmology.”
III.
Evolution with redshift
1.
Title: A fundamental relation
between mass, SFR and metallicity in local and
high redshift galaxies
Authors:
F. Mannucci,
G. Cresci,
R. Maiolino,
A. Marconi,
A. Gnerucci
arXiv:1005.0006
Quote: “At low
stellar mass, metallicity decreases sharply with
increasing SFR, while at high stellar mass,
metallicity does not depend on SFR. High
redshift galaxies, up to z~2.5 are found to
follow the same FMR defined by local SDSS
galaxies, with no indication of evolution. The
evolution of the mass-metallicity relation
observed up to z=2.5 is due to the fact that
galaxies with progressively higher SFRs, and
therefore lower metallicities, are selected at
increasing redshifts, sampling different parts
of the same FMR.”
2.
Title:
An explanation for the cosmological redshift
Authors: Dean Mamas
arXiv:
Phys. Essays
23,
326 (2010)
http://link.aip.org/link/?PHESEM/23/326/1
1.
Title:
A Brief and Elementary Note on Redshift
Authors:
José Francisco
García Juliá
viXra:1005.0097
Quote: “A
reasonable explanation of both redshifts:
cosmological (without expansion of the universe)
and intrinsic, is given using a single tired
light mechanism. In the first case, the redshift
is produced because the light interacts with
microwaves. In the second, the interaction is
with radio waves. And all this is compatible
with a static universe with a space temperature
of 2.7 oK.”
2.
Title:
Another Explanation of the Redshifts of the
Pair Quasar-Galaxy NGC 7319
Authors:
José Francisco
García Juliá
viXra:1005.0010
Quote: “The excess
of redshift of the quasar might be produced in
its interior by the transference of heat from
the light waves to the radio waves.”
3.
Title:
New formulae for the Hubble Constant in a
Euclidean Static Universe
Authors:
Zaninetti
Lorenzo
arXiv:1005.0263
Quote:
“It is shown that the Hubble constant can
be derived from the standard luminosity function
of galaxies as well as from a new luminosity
function as deduced from the mass-luminosity
relationship for galaxies. An analytical
expression for the Hubble constant can be found
from the maximum number of galaxies (in a given
solid angle and flux) as a function of the
redshift. A second analytical definition of the
Hubble constant can be found from the redshift
averaged over a given solid angle and flux. The
analysis of two luminosity functions for
galaxies brings to four the new definitions of
the Hubble constant. The equation that regulates
the Malmquist bias for galaxies is derived and
as a consequence it is possible to extract a
complete sample.”
4.
Title:
An explanation for the cosmological redshift
Authors: Dean Mamas
arXiv:
Phys. Essays
23,
326 (2010)
http://link.aip.org/link/?PHESEM/23/326/1
V.
CMBR anomalies
1.
Title:
Probing non-Gaussianities on Large Scales in
WMAP5 and WMAP7 Data using Surrogates
Authors:
C. Raeth,
G. Rossmanith,
G. Morfill,
A. J. Banday,
K. M. Gorski
arXiv:1005.2481
Quote: “Using
scaling indices as test statistics we find
highly significant signatures for both non-Gaussianities
and asymmetries on large scales for the WMAP
data of the CMB. We find remarkably similar
results when analyzing different ILC-maps based
on the WMAP five and seven year data. Such
features being independent from the map-making
procedure would disfavor the fundamental
principle of isotropy as well as canonical
single-field slow-roll inflation - unless there
is some undiscovered systematic error in the
collection or reduction of the CMB data or yet
unknown foreground contributions.”
2.
Title:
Testing large-angle deviation from Gaussianity
in CMB maps
Authors:
A. Bernui,
M.J. Reboucas,
A.F.F. Teixeira
arXiv:1005.0883
Quote: “A detection
of the level of non-Gaussianity in the CMB data
is essential to discriminate among inflationary
models and also to test alternative primordial
scenarios. However, the extraction of primordial
non-Gaussianity is a difficult endeavor since
several effects of non-primordial nature can
produce non-Gaussianity.”
3.
Title:
Anomalous variance in the WMAP data caused by
Galactic Foreground residuals
Authors:
M. Cruz,
P. Vielva,
E.
Martínez-González,
R. B. Barreiro
arXiv:
arXiv:1005.1264
Quote: “These
residuals would affect the estimation of the
angular power spectrum from the WMAP data, which
is used to generate Gaussian simulations, giving
rise to an inconsistency between the estimated
and expected CMB variance. We also find that
removing the quadrupole from data and
simulations the significance drops. Moreover, we
show that a violation of Gaussianity and/or
isotropy could be a further cause of the low
variance. Galactic foreground residuals affect
in some extent the quadrupole and are highly
anisotropic, however we cannot discard the
presence of alternative causes such as for
instance systematic errors. This anomaly could
also affect the estimation of the cosmological
parameters.”
4.
Title:
Can one reconstruct masked CMB sky?
Authors:
R. Aurich,
S. Lustig
arXiv:1005.5069
Quote: “The CMB maps
obtained by observations always possess domains
which have to be masked due to severe
uncertainties with respect to the genuine CMB
signal. Cosmological analyses ideally use full
CMB maps in order to get e.g. the angular power
spectrum. There are attempts to reconstruct the
masked regions at least at low resolutions, i.e.
at large angular scales, before a further
analysis follows. In this paper, the quality of
the reconstruction is investigated for the ILC
(7yr) map as well as for 1000 CMB simulations of
the LambdaCDM concordance model. The latter
allows an error estimation for the
reconstruction algorithm which reveals some
drawbacks. The analysis points to errors of the
order of a significant fraction of the mean
temperature fluctuation of the CMB.”
5.
Title:
Giant Rings in the CMB Sky
Authors:
Ely D. Kovetz,
Assaf Ben-David,
Nissan Itzhaki
arXiv:1005.3923
VI.
Method
1.
Title:
Inhomogeneity and the foundations of concordance
cosmology
Authors:
Chris Clarkson
Roy Maartens
arXiv:1005.2165
Quote:
“The apparent accelerating expansion of the
Universe is forcing us to examine the
foundational aspects of the standard model of
cosmology -- in particular, the fact that dark
energy is a direct consequence of the
homogeneity assumption. We discuss the
foundations of the assumption of spatial
homogeneity, in the case when the Copernican
Principle is adopted. We present results that
show how (almost-) homogeneity follows from
(almost-) isotropy of various observables. The
analysis requires the fully nonlinear field
equations -- i.e., it is not possible to use
second- or higher-order perturbation theory,
since one cannot assume a homogeneous and
isotropic background. Then we consider what
happens if the Copernican Principle is abandoned
in our Hubble volume. The simplest models are
inhomogeneous but spherically symmetric
universes which do not require dark energy to
fit the distance modulus. Key problems in these
models are to compute the CMB anisotropies and
the features of large-scale structure. We review
how to construct perturbation theory on a
non-homogeneous cosmological background, and
discuss the complexities that arise in using
this to determine the growth of large-scale
structure.”
2.
Title:
Testing the Distance-Duality Relation with
Galaxy Clusters and Supernovae Ia
Authors:
R. F. L.
Holanda,
J. A. S. Lima,
M. B. Ribeiro
arXiv:1005.4458
Quote:
“In the best scenario (linear parametrization)
we obtain (...) for de Fillipis et al. sample (eliptical
geometry), a result only marginally compatible
with the DD relation. However, for Bonamente et
al. sample (spherical geometry) the constraint
is (…) which I clearly incompatible with the
duality-distance relation.”
VII.
Titles of the month
1.
Title: Testing the No-Hair
Theorem with Observations in the Electromagnetic
Spectrum: II. Black-Hole Images
Authors:
Tim Johannsen,
Dimitrios
Psaltis
arXiv:1005.1931
2.
Title:
Chameleon Cosmology Model Describing the Phantom
Divide Line Crossing
Authors:
F. Cannata,
A.Yu. Kamenshchik
arXiv:1005.1878 |
