Practical cosmology and cosmology physics

In summary, this conference discusses the current state of cosmological physics and how to improve it. They discuss concepts such as energy conservation, the Hubble-deVaucouleurs paradox, and dark matter and energy. They also mention a recent challenge from the condensed matter community.
  • #1
wolram
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arXiv:0809.1084 [pdf]
Title: Practical cosmology and cosmological physics
Authors: Yu. Baryshev (1), I. Taganov (2), P. Teerikorpi (3) ((1)Astron. Inst. St.-Petersburg Univ., (2)Russ. Geograph. Soc., (3)Tuorla Obs. Turku Univ.)
Comments: 16 pages, summary of the conference "Problems of Practical Cosmology", June 2008, St.-Petersburg, Russia, full texts of all reports see this http URL
Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc)

We present a summary of the International conference "Problems of practical cosmology", held at Russian Geographical Society, 23-27 June 2008, St.-Petersburg, Russia, where original reports were offered for discussion of new developments in modern cosmological physics, including the large scale structure of the Universe, the evolution of galaxies, cosmological effects in the local stellar systems, gravity physics for cosmology, cosmological models, and crucial observational tests of rival world models. The term "Practical Cosmology" was introduced by Allan Sandage in 1995 when he formulated "23 astronomical problems for the next three decades" at the conference on "Key Problems in Astronomy and Astrophysics" held at Canary Islands. Now when the first decade has passed, we can summarise the present situation in cosmological physics emphasizing interesting hot problems that have arisen during the last decade. Full texts of all reports are available at the website of the conference.

http://eprintweb.org/S/article/astro-ph/0809.1084 [Broken]
 
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  • #3
jal said:
I have done a quick look at some of their papers.
They are certainly not afraid to discuss and evaluate different approaches/ideas.
I have picked out one out of the bunch.
http://ppc08.astro.spbu.ru/fin_program.html
Problems of Practical Cosmology
June 23-27 2008
http://ppc08.astro.spbu.ru/materials/thesis/53.doc
Questioning the Observational Evidence for the Cosmological Standard Model
A. Unzicker

Sun glasses and headphone time.
 
  • #4
Hi Wolram,
Thanks for the reference.

I recommend reading Y.V. Baryshev's paper in Session V, "Expanding Space: the root of conceptual problems of the cosmological physics." It provides a nice, succinct overview of a few important conceptual issues with the Friedmann standard model: violation of energy conservation in expanding space, the nature of cosmological redshift, and the Hubble-deVaucouleurs paradox.

Jon
 
  • #5
wolram
Sun glasses and headphone time.
Don't be so hard on the learning process ...
Cosmology is an extrapolation of experimental evidence.
New evidence ...
Energy Budget distribution
1. Looking at how the energy budget of the universe used to be calculated.
2. Trying to see if those same assumptions would still work with the discovery of dark energy and dark matter.

However, as we speak, the condensed matter community is sending out another challenge.
Can those assumption still be valid if you started out from a de-confined perfect liquid of quark gluon with no mass, no gravity, no electrons no photons, no EMF.
I guess that we would first have to figure out how these attributes became emergent.
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1. What is the difference between practical cosmology and cosmology physics?

Practical cosmology is the study of the universe and its origins through observations and experiments, while cosmology physics is the theoretical study of the laws and principles that govern the universe. Practical cosmology relies on data and observations, while cosmology physics uses mathematical models and theories to understand the universe.

2. How do scientists measure the expansion of the universe?

Scientists use a variety of methods to measure the expansion of the universe, including analyzing the light from distant galaxies, observing the cosmic microwave background, and studying the movement of objects in the universe. These measurements help us understand the rate at which the universe is expanding and how it has changed over time.

3. What is dark matter and why is it important in cosmology?

Dark matter is a mysterious substance that makes up about 27% of the universe and does not interact with light, making it invisible to telescopes. Scientists believe that dark matter plays a crucial role in the structure and evolution of the universe, as it provides the gravitational pull necessary for galaxies to form and hold together.

4. How does the Big Bang theory explain the origins of the universe?

The Big Bang theory is the most widely accepted explanation for the origins of the universe. It states that the universe began as a singularity, a point of infinite density and temperature, and has been expanding and cooling ever since. As the universe expanded, particles and energy were created, eventually forming the galaxies, stars, and planets we see today.

5. What is the role of dark energy in cosmology?

Dark energy is a theoretical force that is thought to be responsible for the accelerating expansion of the universe. It is believed to make up about 68% of the universe and its exact nature is still a mystery. Understanding dark energy is crucial for explaining the future fate of the universe and its overall structure and evolution.

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