A new formula for the rotation velocity – and density distribution of a
... observed now, means that the mass (visible + invisible) increase with distance from the center according to Keplers equations above. Many astronomers believe that much invisible dark matter is situated outside the visible part of the galaxy Ostriker et al. (4) and Einasto et al. (5). They found that ...
... observed now, means that the mass (visible + invisible) increase with distance from the center according to Keplers equations above. Many astronomers believe that much invisible dark matter is situated outside the visible part of the galaxy Ostriker et al. (4) and Einasto et al. (5). They found that ...
Studying the Universe Studying the Universe
... electromagnetic radiation. Most of the electromagnetic spectrum is invisible to our eyes. Earth’s atmosphere blocks most electromagnetic radiation. Think of the atmosphere as a screen that lets in only certain wavelengths of radiation. The atmosphere lets in some ultraviolet and infrared wavelengths ...
... electromagnetic radiation. Most of the electromagnetic spectrum is invisible to our eyes. Earth’s atmosphere blocks most electromagnetic radiation. Think of the atmosphere as a screen that lets in only certain wavelengths of radiation. The atmosphere lets in some ultraviolet and infrared wavelengths ...
Fine structure constant and square root of Planck momentum
... of nature. Such quantities as the velocity of light, c, Newton’s constant of gravitation, G, and the mass of the electron, ~ = 2.π.Q2 .l p me, are assumed to be the same at all places and times in the universe. They form the scaffolding around which the theories of physics are erected, and they defi ...
... of nature. Such quantities as the velocity of light, c, Newton’s constant of gravitation, G, and the mass of the electron, ~ = 2.π.Q2 .l p me, are assumed to be the same at all places and times in the universe. They form the scaffolding around which the theories of physics are erected, and they defi ...
Sample Midterm 1 - inst.eecs.berkeley.edu
... Consider the above silicon diode. Assume that N+ and P+ regions are so heavily doped that Ec = Ef in the N+ region and EF = EV in the P+ region. The doping in the P-type region is 1017 cm-3. Assume that the P layer is thin enough that it is completely depleted. All calculations are done at T = 300K. ...
... Consider the above silicon diode. Assume that N+ and P+ regions are so heavily doped that Ec = Ef in the N+ region and EF = EV in the P+ region. The doping in the P-type region is 1017 cm-3. Assume that the P layer is thin enough that it is completely depleted. All calculations are done at T = 300K. ...
Overview and historical perspective on Cosmology
... Anthropic Principle • Anti-Copernican principle • Of all possible universes, if ours weren’t like this, we wouldn’t be here to notice • We are in a special time and place in this universe: Earth is good, the Sun’s still here, we had time for life to evolve, we didn’t die off • “If things had been d ...
... Anthropic Principle • Anti-Copernican principle • Of all possible universes, if ours weren’t like this, we wouldn’t be here to notice • We are in a special time and place in this universe: Earth is good, the Sun’s still here, we had time for life to evolve, we didn’t die off • “If things had been d ...
Contents - Classroom Complete Press
... a) Label the diagrams using the following words: star, solar system, galaxy. ...
... a) Label the diagrams using the following words: star, solar system, galaxy. ...
My Favorite Universe
... rotation has the effect of Àattening the system. This general Àattening is also seen in galaxies. In the Milky Way, for example, some stars reveal the skeleton of the sphere that originally existed, but the galaxy has Àattened out. Earth, too, is slightly bigger at the equator than at the poles, bec ...
... rotation has the effect of Àattening the system. This general Àattening is also seen in galaxies. In the Milky Way, for example, some stars reveal the skeleton of the sphere that originally existed, but the galaxy has Àattened out. Earth, too, is slightly bigger at the equator than at the poles, bec ...
Determining Krypton Concentration is Xenon
... many people are trying to find dark matter. However the question is how come we are not able to see or easily detect this matter, and what is it ?. This is where theorizing comes into play. There are many theories as to what dark matter properties should be . One theory which Xenon 100 is based off ...
... many people are trying to find dark matter. However the question is how come we are not able to see or easily detect this matter, and what is it ?. This is where theorizing comes into play. There are many theories as to what dark matter properties should be . One theory which Xenon 100 is based off ...
Andrew Sonnenschein: The level of poetry…
... AS: That’s true. As I said, after the Big Bang the Universe was essentially homogeneous, smooth on almost all scales, like a gas, without structures, while now there are a lot of structures, points of concentrations of mass such as stars and planets, which leads to the question: how has the Universe ...
... AS: That’s true. As I said, after the Big Bang the Universe was essentially homogeneous, smooth on almost all scales, like a gas, without structures, while now there are a lot of structures, points of concentrations of mass such as stars and planets, which leads to the question: how has the Universe ...
S382 / S383 Are you ready for S382 or S383?
... (b) Calculate the numerical value of A and express your answer in scientific notation to an appropriate number of significant figures. Question 2.5 The age t, spin period P and rate of change of spin period Ṗ of a pulsar are related by the equation t = P/2Ṗ . Take logarithms of this equation and dete ...
... (b) Calculate the numerical value of A and express your answer in scientific notation to an appropriate number of significant figures. Question 2.5 The age t, spin period P and rate of change of spin period Ṗ of a pulsar are related by the equation t = P/2Ṗ . Take logarithms of this equation and dete ...
The New Minimal Standard Model
... on purely empirical arguments once inflation is accepted as the source of the density fluctuations. It is remarkable that the MSM Lagrangian Eq. (1), supplemented by the most general renormalizable Lagrangian in Eqs. (2, 3, 4, 5, 6) for two right-handed neutrinos Nα , one Z2 odd real scalar S, and a ...
... on purely empirical arguments once inflation is accepted as the source of the density fluctuations. It is remarkable that the MSM Lagrangian Eq. (1), supplemented by the most general renormalizable Lagrangian in Eqs. (2, 3, 4, 5, 6) for two right-handed neutrinos Nα , one Z2 odd real scalar S, and a ...
Other galaxies, the expansion of the universe
... hydrogen alpha line at 656.3 nm. At what wavelength would we observe this line a spectrum of this galaxy? A. 2.7% of 656.3 nm B. 2.7% less than 656.3 nm C. 2.7% more than 656.3 nm D. It depends on the Hubble constant. ...
... hydrogen alpha line at 656.3 nm. At what wavelength would we observe this line a spectrum of this galaxy? A. 2.7% of 656.3 nm B. 2.7% less than 656.3 nm C. 2.7% more than 656.3 nm D. It depends on the Hubble constant. ...
TA`s solution set
... taken 4 or 5 hours, but you wouldn’t know that from the speed you had at the end. In the same way, the universe could have expanded much more slowly early on. This would give stars plenty of time to form. Other explanations are OK too. If you abandoned the Big Bang theory, you could explain what we ...
... taken 4 or 5 hours, but you wouldn’t know that from the speed you had at the end. In the same way, the universe could have expanded much more slowly early on. This would give stars plenty of time to form. Other explanations are OK too. If you abandoned the Big Bang theory, you could explain what we ...
Mysterious transient objects - NCRA
... •When the neutron star in initial formation stages gains very high magnetic field •It becomes a magnetar with 1015 Gauss magnetic field •Global rearrangement in its magnetic structures give SGRs •Only Galactic sources with energies ~1041-46 ergs ...
... •When the neutron star in initial formation stages gains very high magnetic field •It becomes a magnetar with 1015 Gauss magnetic field •Global rearrangement in its magnetic structures give SGRs •Only Galactic sources with energies ~1041-46 ergs ...
ppt
... quasi-equatorial disk from which the planets were formed and the outer 2.5% of the Sun’s mass (above the tachocline) was added to and not mixed in, so its composition appears to match. This ‘contamination’ of the outer Sun explains why the Sun and more than 60% of exoplanetharbouring stars have high ...
... quasi-equatorial disk from which the planets were formed and the outer 2.5% of the Sun’s mass (above the tachocline) was added to and not mixed in, so its composition appears to match. This ‘contamination’ of the outer Sun explains why the Sun and more than 60% of exoplanetharbouring stars have high ...
Slide - University of Cambridge
... and 3 is consistent with emitted current coming mainly from orbitals with phase factor exp ±if, as expected for the Fermi level of a simple ...
... and 3 is consistent with emitted current coming mainly from orbitals with phase factor exp ±if, as expected for the Fermi level of a simple ...
Neutrinos in an Expanding Universe Paper (IOP)
... We have simulated the effects of galaxy formation on the neutrino spectra and densities with a computer program that was especially developed for this purpose. Our simulations show that the lowfield region around the center-of-mass of this galaxy cluster is gradually populated by neutrinos with a dec ...
... We have simulated the effects of galaxy formation on the neutrino spectra and densities with a computer program that was especially developed for this purpose. Our simulations show that the lowfield region around the center-of-mass of this galaxy cluster is gradually populated by neutrinos with a dec ...
Using the Relaxation Method to solve Poisson`s Equation
... The relaxation method is an iterative methods used for solving systems of equations. This means they generate a sequence of numbers that update the approximate solutions for a specific problem. It’s called the relaxation method because that is exactly what it does, it smooths out the fine-scale fact ...
... The relaxation method is an iterative methods used for solving systems of equations. This means they generate a sequence of numbers that update the approximate solutions for a specific problem. It’s called the relaxation method because that is exactly what it does, it smooths out the fine-scale fact ...
PHYSICS 1-3 - All Science Leads To God
... that all truth is subjective and therefore personal & relative, than this set, “all truth” includes their own claims of universal “subjective relativity” and the rest of humanity has no reason to give any heed to it. Their arguments concerning their universe being without objective truth says nothin ...
... that all truth is subjective and therefore personal & relative, than this set, “all truth” includes their own claims of universal “subjective relativity” and the rest of humanity has no reason to give any heed to it. Their arguments concerning their universe being without objective truth says nothin ...
The Velocity of Light - Gravitational Relativity
... be possible according to the second postulate of Albert Einstein’s 1905 theory of special relativity, the constant speed of light (186,000 miles per second), since matter cannot travel faster than the speed of light. Einstein’s enshrined speed of light also poses a serious problem for young universe ...
... be possible according to the second postulate of Albert Einstein’s 1905 theory of special relativity, the constant speed of light (186,000 miles per second), since matter cannot travel faster than the speed of light. Einstein’s enshrined speed of light also poses a serious problem for young universe ...
The Velocity of Light - Gravitational Relativity
... be possible according to the second postulate of Albert Einstein’s 1905 theory of special relativity, the constant speed of light (186,000 miles per second), since matter cannot travel faster than the speed of light. Einstein’s enshrined speed of light also poses a serious problem for young universe ...
... be possible according to the second postulate of Albert Einstein’s 1905 theory of special relativity, the constant speed of light (186,000 miles per second), since matter cannot travel faster than the speed of light. Einstein’s enshrined speed of light also poses a serious problem for young universe ...
Inflation Basics
... • Conservative “by-eye” comparison with observation of roughly equal leading and trailing stream constrains DM force law to be within ~10% of that for baryons ...
... • Conservative “by-eye” comparison with observation of roughly equal leading and trailing stream constrains DM force law to be within ~10% of that for baryons ...
History of the 2.7 K Temperature Prior to Penzias and Wilson
... stationary condition, that is, the present fixed stars cool continually and new ones are being formed” (Nernst 1928). In 1937 he developed this model and proposed a tired light explanation of the cosmological redshift, namely, the absorption of radiation by the luminiferous ether, decreasing the ene ...
... stationary condition, that is, the present fixed stars cool continually and new ones are being formed” (Nernst 1928). In 1937 he developed this model and proposed a tired light explanation of the cosmological redshift, namely, the absorption of radiation by the luminiferous ether, decreasing the ene ...
ppt
... The most reasonable conclusion then is that the Universe at early times T>38MeV possessed an asymmetry between baryons and antibaryons which prevented the annihilation catastrophe. At high temperatures T>1GeV, thermal quark-antiquark pairs were present in great numbers, nq ~ nq ~ ng , so that the b ...
... The most reasonable conclusion then is that the Universe at early times T>38MeV possessed an asymmetry between baryons and antibaryons which prevented the annihilation catastrophe. At high temperatures T>1GeV, thermal quark-antiquark pairs were present in great numbers, nq ~ nq ~ ng , so that the b ...
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.