Quintessence
... How to distinguish Q from Λ ? A) Measurement Ωh(z) H(z) i) Ωh(z) at the time of structure formation , CMB - emission or nucleosynthesis ii) equation of state wh(today) > -1 B) Time variation of fundamental “constants” C) Apparent violation of equivalence principle D) Possible coupling between Dark ...
... How to distinguish Q from Λ ? A) Measurement Ωh(z) H(z) i) Ωh(z) at the time of structure formation , CMB - emission or nucleosynthesis ii) equation of state wh(today) > -1 B) Time variation of fundamental “constants” C) Apparent violation of equivalence principle D) Possible coupling between Dark ...
The Galaxies
... Universe in just the last few years, and many decades-old problems have been solved by Hubble and WMAP. ► However, many fundamental questions such as the nature of dark mater and dark energy remain unanswered. It is likely that significant progress will be made in our lifetime, so keep an eye out fo ...
... Universe in just the last few years, and many decades-old problems have been solved by Hubble and WMAP. ► However, many fundamental questions such as the nature of dark mater and dark energy remain unanswered. It is likely that significant progress will be made in our lifetime, so keep an eye out fo ...
ElementaryQualifierOct2003
... (a) Do any ten (10) of the twelve (12) problems of the following pages. (b) Indicate on this page (below right) which 10 problems you wish to have graded. (c) If you need more space for any given problem, write on the back of that problem’s page. (d) Mark your name code on all pages. (e) Be sure to ...
... (a) Do any ten (10) of the twelve (12) problems of the following pages. (b) Indicate on this page (below right) which 10 problems you wish to have graded. (c) If you need more space for any given problem, write on the back of that problem’s page. (d) Mark your name code on all pages. (e) Be sure to ...
2002 astronomy magazine index
... See also SETI and galactic habitable zone (GHZ), 8:44–51 eyepieces (telescope), 965-inch, 12:67 ...
... See also SETI and galactic habitable zone (GHZ), 8:44–51 eyepieces (telescope), 965-inch, 12:67 ...
3rd EXAM VERSION A key - Department of Physics and Astronomy
... A. only between objects separated by a vacuum; as a result, our bodies do not expand but the Earth-Moon system does. B. primarily in the huge voids between clusters of galaxies: "small" objects like galaxies or the Earth do not expand. C. only over distances about the size of a galaxy or larger; con ...
... A. only between objects separated by a vacuum; as a result, our bodies do not expand but the Earth-Moon system does. B. primarily in the huge voids between clusters of galaxies: "small" objects like galaxies or the Earth do not expand. C. only over distances about the size of a galaxy or larger; con ...
Hubble`s Expansion of the Universe
... As we go further out into the Universe, eventually we are no longer able to use Cepheid variables as a distance indicator as they become too faint. At this point, we use another object known as type Ia supernovae. A supernova marks the end of a star’s life in an extremely energetic explosion. When a ...
... As we go further out into the Universe, eventually we are no longer able to use Cepheid variables as a distance indicator as they become too faint. At this point, we use another object known as type Ia supernovae. A supernova marks the end of a star’s life in an extremely energetic explosion. When a ...
Cosmology
... 1916 Einstein: General Relativity (basic framework for cosmology) 1917 Einstein: cosmology constant (Λ) – biggest blunder 1910 Slipher (Lowell Observatory): redshift / blueshift of nebulae 1913 Andromeda: blueshift – 300 km/s 1913 – 1916 22 nebulae: redshift – 1000 km/s ...
... 1916 Einstein: General Relativity (basic framework for cosmology) 1917 Einstein: cosmology constant (Λ) – biggest blunder 1910 Slipher (Lowell Observatory): redshift / blueshift of nebulae 1913 Andromeda: blueshift – 300 km/s 1913 – 1916 22 nebulae: redshift – 1000 km/s ...
The Fall 2005 Qualifying Exam, Part 1
... You are given a microphone hooked up to a frequency analyzer and asked to measure the sound velocity in a steel bar of length L = 0.5m by measuring the frequency of sound waves generated when the bar is struck by a steel mallet. (a) Assuming that the bar is supported by a rigid clamp at the center o ...
... You are given a microphone hooked up to a frequency analyzer and asked to measure the sound velocity in a steel bar of length L = 0.5m by measuring the frequency of sound waves generated when the bar is struck by a steel mallet. (a) Assuming that the bar is supported by a rigid clamp at the center o ...
The Universe Fine-Tuned for Life
... it is doubtful whether carbon-based life would arise in such a universe. If the magnitude of strong interaction were greater by only two percent, two protons could combine to form a nucleus made of just two protons. This process, which is governed by strong interaction, would be much more rapid than ...
... it is doubtful whether carbon-based life would arise in such a universe. If the magnitude of strong interaction were greater by only two percent, two protons could combine to form a nucleus made of just two protons. This process, which is governed by strong interaction, would be much more rapid than ...
Chapter 1 Our Place in the Universe
... distance between galaxies is increasing with time. This means that galaxies ( or at least matter) must have been close together in the past. If we go back far enough, all the matter was concentrated in a small radius from which the expansion began. That is called the Big Bang. From the rate of expan ...
... distance between galaxies is increasing with time. This means that galaxies ( or at least matter) must have been close together in the past. If we go back far enough, all the matter was concentrated in a small radius from which the expansion began. That is called the Big Bang. From the rate of expan ...
Lecture 1, PPT version
... In-class “Minute Papers” • Last 5 minutes of class (12:15pm to 12:20pm) write a few sentences on one of the following: something you found particularly interesting in the day’s lecture, something you found particularly confusing in the day’s lecture, questions you have about topics that were covere ...
... In-class “Minute Papers” • Last 5 minutes of class (12:15pm to 12:20pm) write a few sentences on one of the following: something you found particularly interesting in the day’s lecture, something you found particularly confusing in the day’s lecture, questions you have about topics that were covere ...
Chapter 9 / Adobe Acrobat Document
... to those aboard the shuttle—seven astronauts died during the Challenger launch disaster and another seven astronauts died when Columbia broke up on re-entry. 28. Hubble and Humason’s distance-redshift relationship: the universe’s expansion has been confirmed by observations at very large distances a ...
... to those aboard the shuttle—seven astronauts died during the Challenger launch disaster and another seven astronauts died when Columbia broke up on re-entry. 28. Hubble and Humason’s distance-redshift relationship: the universe’s expansion has been confirmed by observations at very large distances a ...
P1a_Revision_lesson
... expected. This shows that these galaxies are moving ____ from us very quickly. This effect is seen to a greater extent in galaxies that are _______ away from us. This indicates that the further away the galaxy is, the ______ it is moving. This evidence seems to suggest that everything in the univers ...
... expected. This shows that these galaxies are moving ____ from us very quickly. This effect is seen to a greater extent in galaxies that are _______ away from us. This indicates that the further away the galaxy is, the ______ it is moving. This evidence seems to suggest that everything in the univers ...
dm - The Institute of Mathematical Sciences
... Thus the central part of the Bullet Cluster is almost entirely made up of ordinary matter. But evidence from gravitational lensing suggests that most of the matter resides outside the central region. In the picture, the central region with a dark outline is the visible region as seen by the Xray obs ...
... Thus the central part of the Bullet Cluster is almost entirely made up of ordinary matter. But evidence from gravitational lensing suggests that most of the matter resides outside the central region. In the picture, the central region with a dark outline is the visible region as seen by the Xray obs ...
Cosmology and Particle Physics
... be there now, Andromeda would be dierent. Similarly, light from the most distant galaxy left it 14 billion years ago. We have an incredible view of the past when looking great distances. We can try to see if the universe was dierent thenif distant galaxies are more tightly packed or have younger- ...
... be there now, Andromeda would be dierent. Similarly, light from the most distant galaxy left it 14 billion years ago. We have an incredible view of the past when looking great distances. We can try to see if the universe was dierent thenif distant galaxies are more tightly packed or have younger- ...
Class 28 (Jun 2) - Physics at Oregon State University
... distance from center. • Density of dark matter is highest in center of galaxy but falls off gradually and even exists ...
... distance from center. • Density of dark matter is highest in center of galaxy but falls off gradually and even exists ...
Why is the darkness of the night sky evidence for the Big Bang?
... flows in and essentially a white hole part in another universe where matter flows out. ...
... flows in and essentially a white hole part in another universe where matter flows out. ...
1. (Similar to Problem 2.1) Three equal charges, q, are situated at
... 3. (Similar to Example 2.3) A long cylinder (Fig. 2.21) carries a charge density that is proportional to the distance from the axis ρ = k , for some constant k. Find the electric field inside this cylinder. 4. (Similar to Problem 2.12) Use Gauss’ law to find the electric field inside a uniformly cha ...
... 3. (Similar to Example 2.3) A long cylinder (Fig. 2.21) carries a charge density that is proportional to the distance from the axis ρ = k , for some constant k. Find the electric field inside this cylinder. 4. (Similar to Problem 2.12) Use Gauss’ law to find the electric field inside a uniformly cha ...
The universe is faster, colder, and wackier than anything we can
... Sk yandTelescope.com March 2013 ...
... Sk yandTelescope.com March 2013 ...
Astronomy
... Describe the position and motion of our solar system in our galaxy and the overall scale, structure, and age of the universe. E5.1b Describe how the Big Bang theory accounts for the formation of the universe. E5.1c Explain how observations of the cosmic background radiation have helped determine the ...
... Describe the position and motion of our solar system in our galaxy and the overall scale, structure, and age of the universe. E5.1b Describe how the Big Bang theory accounts for the formation of the universe. E5.1c Explain how observations of the cosmic background radiation have helped determine the ...
Spring 2007 Qualifying Exam
... A refrigerator uses 10 W of electrical power when it is closed to keep the interior temperature stable. Use reasonable estimates for any relevant temperatures to find an upper bound on the rate at which heat is entering the refrigerator due to imperfect thermal insulation. Problem 9: A spacecraft is ...
... A refrigerator uses 10 W of electrical power when it is closed to keep the interior temperature stable. Use reasonable estimates for any relevant temperatures to find an upper bound on the rate at which heat is entering the refrigerator due to imperfect thermal insulation. Problem 9: A spacecraft is ...
Spiralicity and Motion on Cosmic Scale
... chamber to huge galaxies in the universe. Spiral galaxies are believed to form out of spinning gases and dark dust that made them to come together. The ultraviolet-light observations by the Hubble Space Telescope are unvealing a colourful picture of the universe providing information about the birth ...
... chamber to huge galaxies in the universe. Spiral galaxies are believed to form out of spinning gases and dark dust that made them to come together. The ultraviolet-light observations by the Hubble Space Telescope are unvealing a colourful picture of the universe providing information about the birth ...
Lecture 5
... Cloud (LMC) and Small Magellanic Cloud (SMC), two of the nearby satellite galaxies of our own Milky Way Galaxy. Since the LMC and SMC contain large number of Cepheids, they can be used to calibrate the distance scale. Cosmos5 ...
... Cloud (LMC) and Small Magellanic Cloud (SMC), two of the nearby satellite galaxies of our own Milky Way Galaxy. Since the LMC and SMC contain large number of Cepheids, they can be used to calibrate the distance scale. Cosmos5 ...
Slide 1
... Cloud (LMC) and Small Magellanic Cloud (SMC), two of the nearby satellite galaxies of our own Milky Way Galaxy. Since the LMC and SMC contain large number of Cepheids, they can be used to calibrate the distance scale. Cosmos5 ...
... Cloud (LMC) and Small Magellanic Cloud (SMC), two of the nearby satellite galaxies of our own Milky Way Galaxy. Since the LMC and SMC contain large number of Cepheids, they can be used to calibrate the distance scale. Cosmos5 ...
Flatness problem
The flatness problem (also known as the oldness problem) is a cosmological fine-tuning problem within the Big Bang model of the universe. Such problems arise from the observation that some of the initial conditions of the universe appear to be fine-tuned to very 'special' values, and that a small deviation from these values would have had massive effects on the nature of the universe at the current time.In the case of the flatness problem, the parameter which appears fine-tuned is the density of matter and energy in the universe. This value affects the curvature of space-time, with a very specific critical value being required for a flat universe. The current density of the universe is observed to be very close to this critical value. Since the total density departs rapidly from the critical value over cosmic time, the early universe must have had a density even closer to the critical density, departing from it by one part in 1062 or less. This leads cosmologists to question how the initial density came to be so closely fine-tuned to this 'special' value.The problem was first mentioned by Robert Dicke in 1969. The most commonly accepted solution among cosmologists is cosmic inflation, the idea that the universe went through a brief period of extremely rapid expansion in the first fraction of a second after the Big Bang; along with the monopole problem and the horizon problem, the flatness problem is one of the three primary motivations for inflationary theory.