Cosmology

This is an open group for those who are interested in the field of cosmology. | Review and cite COSMOLOGY protocol, troubleshooting and other methodology information | Contact experts in COSMOLOGY to get answers

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Questions related to Cosmology

Why don't we consider the time before the Big Bang?

The entire universe originated from a single point after the Big Bang. Then how can we explain the time before big bang?

01 February 2014 3,916 22 View

The flatness problem or, why do we think the observable universe is big?

Clearly the observable universe is big compared to the human let alone (sub) atomic scale. However we also know that the universe is very flat, which in the Friedman Robertson universe means that...

01 February 2014 6,780 100 View

Has it suddenly become fashionable to state that 'There are no Black Holes', further to Stephen Hawking's recent paper altering their definition?

For those who take that view - can you then please walk us through what happens in the wake of a massive supernova burst ? All the scenarios I see lead back to a black hole, and I'd be really...

01 February 2014 5,171 17 View

Can the Lambda-CDM cosmological model survive the discrepancy between galaxy cluster observations and CMB projections?

See http://www.nature.com/news/cosmic-mismatch-hints-at-the-existence-of-a-sterile-neutrino-1.14752. It states: "… The background radiation shows the small density variations in the early...

01 February 2014 9,523 30 View

Is the General Theory of Relativity equivalent to the Ginzburg-Landau theory of superconductivity?

There is a quite recent paper (2011) by Santiago-German which says that the Einstein's general theory of relativity is formally equivalent to the Ginzburg-Landau theory of superconductivity...

31 December 2013 1,295 51 View

Why we are interested in Astronomy and Astrophysics?Why we are interested in studying the Cosmos and solving the mysteries of our Universe?

"Knowing and understanding the stage on which our life is being played is crucial for any existence to have real meaning."

31 December 2013 10,041 11 View

Is the cosmic axis due to a large-scale magnetic field?

...

31 December 2013 2,945 15 View

Could a supermassive black hole singularity experience amplification of quantum fluctuations similar to AQFs that Linde claims cause a big bang?

Could a singularity in a supermassive black hole experience amplification of quantum fluctuations similar to quantum fluctuations that form ever larger cycles, causing a big bang as described by...

31 December 2013 2,061 16 View

Is Frank Tipler's Omega Point hypothesis supported by observation?

Caution: I am not sure about this topic, and I never read Tipler's papers and books except for one paper, but it seems that his ideas are quite interesting to ponder. An interesting page to begin...

11 December 2013 8,631 3 View

What do you think about rephrasing the dark energy problem?

In my opinion, the usual way to talk about the so-called dark energy problem can be misleading for non-specialists of the subject. In the blog entry http://bit.ly/1bR3QSn, following Bianchi and...

11 December 2013 5,926 49 View

Why are almost all the systems of heavenly bodies like a galaxies or stellar systems oriented almost along planes?

Our Solar system is along a plane. Our milky-way galaxy is also along a plane.

11 December 2013 5,428 14 View

Has the speed of light been accurately measured in space, and would it be the same as on earth?

I believe there is reason to expect that the measure of the speed of light on the International Space Station would be greater than it is measured at the surface of the earth. My expectation is...

10 November 2013 4,625 32 View

Relevance of Particle/Rule theories to the unification of physical laws?

Generic particle/interaction rule models may have relevance to the unification of physical law as described in this apparently unpublished paper by Julian Barbour and Lee Smolin:...

10 November 2013 5,237 15 View

Can someone suggest galaxies, for which both the total baryonic mass and the mass of its central supermassive black hole have been calculated?

Of the 72 central supermassive black holes on the McConnell and Ma table in their paper “Revisiting the Scaling Relations of Black Hole Masses and Host Galaxy Properties”, I have only found six...

10 November 2013 998 9 View

What are the cosmic dispirations?

When I described dispirations in a little paper long ago (Phil Mag 1970 22 949-952) I had biological and polymeric materials in my mind. They have since been found in crystalline polymers and...

10 November 2013 3,291 5 View

Is anyone interested in the full data release of the ALHAMBRA data?

The ALHAMBRA survey (http://alhambrasurvey.com/) has just published its 1st full data release. You can find the the data (catalogs with photo-z and synthetic F814W images) through the following...

10 November 2013 4,833 1 View

Where can I find data or analyses of the total matter at redshift z?

We have proposed that above some unknown scale R the matter density falls off rapidly. What are the observational constraints on the value of R? I gather the amount of matter at redshift z (or...

10 November 2013 9,610 6 View

Why are there different gases for different galaxies?

In different galaxies there appear different gas structures. What is the mechanism adapting certain gases in certain galaxies while excluding the other gases?

10 November 2013 8,934 1 View

Can the variation of coefficient of viscosity of the fluid of the Universe at early times provide any clue to find the nature of Dark Energy.

Universe is assumed to be filled with viscous fluid at its early stages. To explain accelerated expansion of the Universe apart from time varying G and lambda time varying coefficient of viscosity...

09 October 2013 7,544 1 View

Is time equivalent to a space dimension?

I made a dimensional analysis of Einstein field equation, and I found L=T (space dimension= time dimension). Do you have an explanation for that?

09 October 2013 9,679 64 View

In which period of the Solar System history did the Earth’s methane main volumes arise?

This question is of principal importance when discussing the problem of the living-matter origination mechanism.

09 October 2013 5,420 16 View

In f (R) theory of gravity we have to demand f′′(R) > 0 in order to avoid a tachyon-like instability. Why? What is the relation between them?

The applicability of the Legendre-Weyl transform for action of f(R) gravity implies the invertibility of the function f′(R), ie. (locally) f′′(R) != 0.in order to avoid a tachyon-like instability...

08 September 2013 8,794 1 View

How can we explain Tifft's quantization of galaxy redshift?

The reports by Tifft on quantization of galactic redshift are well-known to astronomers. Read for example http://www.vixra.org/abs/1309.0011. See also a recent review on redshift theories by...

08 September 2013 5,287 3 View

Is there a reasonable alternative to the theory of the expanding universe?

We know that our star, the Sun loses about 10^-14 of its mass per year as a result of electromagnetic radiation and particle emission. That reduction in mass should show up as a decreasing...

08 September 2013 3,868 73 View

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