Inflation Basics
... If E<<1015 GeV (e.g., if inflation from PQSB), then polarization far too small to ever be detected. But, if E~1015-16 GeV (i.e., if inflation has something to do with GUTs), then polarization signal is conceivably detectable by Planck ...
... If E<<1015 GeV (e.g., if inflation from PQSB), then polarization far too small to ever be detected. But, if E~1015-16 GeV (i.e., if inflation has something to do with GUTs), then polarization signal is conceivably detectable by Planck ...
Chapter 27
... shown surprising results about the large-scale structure of the universe. • Other groups of astronomers have joined their efforts to map the universe. March 21, 2006 ...
... shown surprising results about the large-scale structure of the universe. • Other groups of astronomers have joined their efforts to map the universe. March 21, 2006 ...
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... Where Do They Come From? • The thin disk: stars formed out of the thin gas disk, it gets gradually puffed up (thicker) due to dynamical effects • The thick disk: it could be a thin disk that was dynamically heated by minor mergers with other galaxies • The bulge: the original, self-enriched stel ...
... Where Do They Come From? • The thin disk: stars formed out of the thin gas disk, it gets gradually puffed up (thicker) due to dynamical effects • The thick disk: it could be a thin disk that was dynamically heated by minor mergers with other galaxies • The bulge: the original, self-enriched stel ...
Star Clusters and Stellar Dynamics
... • There will be a few strong encounters, and lots of weak ones. Their effects can be estimated through Coulomlike scattering ...
... • There will be a few strong encounters, and lots of weak ones. Their effects can be estimated through Coulomlike scattering ...
Dark and baryonic matter in the MareNostrum Universe
... Gravitationally bound halos of different mass form has been formed during the cosmological evolution. These halos consist of dark matter and gas. Due to the hydrodynamical interaction of the gas in general the ration of gas to dark matter within the halos is different from the mean ratio of 0.15 ass ...
... Gravitationally bound halos of different mass form has been formed during the cosmological evolution. These halos consist of dark matter and gas. Due to the hydrodynamical interaction of the gas in general the ration of gas to dark matter within the halos is different from the mean ratio of 0.15 ass ...
Astronomy 100—Exam 3
... 10. One can obtain the rotation speed of a spiral galaxy by measuring A. the relative motions of other galaxies inside them. B. the Doppler shifts of stars and gas on each side of its center. C. the length and curvature of their spiral arms. D. the time it takes individual stars to orbits the center ...
... 10. One can obtain the rotation speed of a spiral galaxy by measuring A. the relative motions of other galaxies inside them. B. the Doppler shifts of stars and gas on each side of its center. C. the length and curvature of their spiral arms. D. the time it takes individual stars to orbits the center ...
Recent Developments in Cosmology
... speed everywhere in the Universe: = (t). According to Quantum Mechanics, the amplitude (or rolling speed) of the field fluctuates: it differs from place to place by a small amount, = (x,t). These field fluctuations imply spatial fluctuations in the energy density of the Universe. During, rehea ...
... speed everywhere in the Universe: = (t). According to Quantum Mechanics, the amplitude (or rolling speed) of the field fluctuates: it differs from place to place by a small amount, = (x,t). These field fluctuations imply spatial fluctuations in the energy density of the Universe. During, rehea ...
Which of the following is not a characteristic of the stars of the disk
... Please indicate the best answer to the following questions on the answer sheet provided. 1. Which of the following is not a characteristic of the stars of the disk component of our galaxy? a. circular orbits, b. randomly inclined orbits, c. higher metal abundance d. young stars, 2. The mass of a sin ...
... Please indicate the best answer to the following questions on the answer sheet provided. 1. Which of the following is not a characteristic of the stars of the disk component of our galaxy? a. circular orbits, b. randomly inclined orbits, c. higher metal abundance d. young stars, 2. The mass of a sin ...
Weak gravitational lensing
While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak lensing regime, in which the deflection is impossible to detect in a single background source. However, even in these cases, the presence of the foreground mass can be detected, by way of a systematic alignment of background sources around the lensing mass. Weak gravitational lensing is thus an intrinsically statistical measurement, but it provides a way to measure the masses of astronomical objects without requiring assumptions about their composition or dynamical state.