
electric charge - National Physical Laboratory
... • We call forces ‘magnetic’ when both particles are moving with respect to us. • They are still electrical in origin. • This was first explained by Albert Einstein in his Theory of Relativity ...
... • We call forces ‘magnetic’ when both particles are moving with respect to us. • They are still electrical in origin. • This was first explained by Albert Einstein in his Theory of Relativity ...
Topics in Early Universe Cosmology
... • Chapter 2 is based on [20] which was written in collaboration with Robert Brandenberger. I performed most of the analytical computations and wrote a large fraction of the body of the text. I derived analytically the energy densities, the equation of state parameters, the equations of motions and s ...
... • Chapter 2 is based on [20] which was written in collaboration with Robert Brandenberger. I performed most of the analytical computations and wrote a large fraction of the body of the text. I derived analytically the energy densities, the equation of state parameters, the equations of motions and s ...
WFIRST-2.4: What Every Astronomer Should Know
... would be able to survey hundreds of nearby stars, enabling the characterization of dozens of known cool Jupiter-mass companions, the discovery and characterization of a similar number of cool Jupiter and Neptune companions, and the detection and characterization of debris disks in systems containin ...
... would be able to survey hundreds of nearby stars, enabling the characterization of dozens of known cool Jupiter-mass companions, the discovery and characterization of a similar number of cool Jupiter and Neptune companions, and the detection and characterization of debris disks in systems containin ...
Understanding the Astrophysics of Galaxy Evolution: the role of
... which they lie. With broad-band imaging data alone, one must resort to photometric redshifts. The standard method is to fit the photometry to a set of template spectra, drawn from population synthesis models or using the observed SEDs of low-redshift galaxies. The problem lies in the appropriate cho ...
... which they lie. With broad-band imaging data alone, one must resort to photometric redshifts. The standard method is to fit the photometry to a set of template spectra, drawn from population synthesis models or using the observed SEDs of low-redshift galaxies. The problem lies in the appropriate cho ...
Gone in a flash: supernovae in the survey era
... have been observed, recorded and studied by humans for nearly 2000 years, since the first descriptions of “guest stars” appeared in the records of Chinese astronomers. These relatively nearby galactic supernovae, appearing brighter in the sky than Venus – perhaps bright ...
... have been observed, recorded and studied by humans for nearly 2000 years, since the first descriptions of “guest stars” appeared in the records of Chinese astronomers. These relatively nearby galactic supernovae, appearing brighter in the sky than Venus – perhaps bright ...
Energy Is Conserved in the Classical Theory of General Relativity
... It turns out that there is a more general version of Noether’s theorem that can be used even when the action includes terms with second derivatives. This provides a more modern approach to the derivation of an energy current that has a dependency on the time translation vector field. Since it does n ...
... It turns out that there is a more general version of Noether’s theorem that can be used even when the action includes terms with second derivatives. This provides a more modern approach to the derivation of an energy current that has a dependency on the time translation vector field. Since it does n ...
Chapter 1 - Pearson Education
... produced in stars that shined long ago. These elements formed Earth through the recycling role played by our galaxy. As we'll discuss shortly, telescopic observations of distant galaxies show that the entire universe is expanding. That is, average distances between galaxies are increasing with time. ...
... produced in stars that shined long ago. These elements formed Earth through the recycling role played by our galaxy. As we'll discuss shortly, telescopic observations of distant galaxies show that the entire universe is expanding. That is, average distances between galaxies are increasing with time. ...
general relativity and gravitational waves
... a curved space: parallel lines can intersect. Another illustration of how curvature manifests itself is perhaps more effective. It is outlined in Fig. 2. We start in point P with a tangent vector that points in the horizontal direction. We take a small step in the direction of Q and after each step ...
... a curved space: parallel lines can intersect. Another illustration of how curvature manifests itself is perhaps more effective. It is outlined in Fig. 2. We start in point P with a tangent vector that points in the horizontal direction. We take a small step in the direction of Q and after each step ...
Primordial Planet Formation - University of California San Diego
... ordinary dark matter. Hydrogen is a gas that condenses to liquid and then forms solid ice at low temperatures. It has large latent heats of evaporation and fusion, so a thermostat temperature range between the triple point temperature and critical temperature is the signature of a cloud of gas ...
... ordinary dark matter. Hydrogen is a gas that condenses to liquid and then forms solid ice at low temperatures. It has large latent heats of evaporation and fusion, so a thermostat temperature range between the triple point temperature and critical temperature is the signature of a cloud of gas ...
Geol. 655 Isotope Geochemistry
... The abundances of naturally occurring nuclides is now reasonably, though perhaps not perfectly, known. We also have what appears to be a reasonably successful theory of nucleosynthesis. Physicists, like all scientists, are attracted to simple theories. Not surprisingly then, the first ideas about nu ...
... The abundances of naturally occurring nuclides is now reasonably, though perhaps not perfectly, known. We also have what appears to be a reasonably successful theory of nucleosynthesis. Physicists, like all scientists, are attracted to simple theories. Not surprisingly then, the first ideas about nu ...
Galaxies
... galaxies, NGC4038 and NGC4039, are called “The Antennae”, because their long tails resemble the antennae of an insect. In our project, we write a computer program to simulate similar collisions. When two galaxies collide, in fact, the stars within them will just glide past one another without any p ...
... galaxies, NGC4038 and NGC4039, are called “The Antennae”, because their long tails resemble the antennae of an insect. In our project, we write a computer program to simulate similar collisions. When two galaxies collide, in fact, the stars within them will just glide past one another without any p ...
Word
... galaxies, NGC4038 and NGC4039, are called “The Antennae”, because their long tails resemble the antennae of an insect. In our project, we write a computer program to simulate similar collisions. When two galaxies collide, in fact, the stars within them will just glide past one another without any p ...
... galaxies, NGC4038 and NGC4039, are called “The Antennae”, because their long tails resemble the antennae of an insect. In our project, we write a computer program to simulate similar collisions. When two galaxies collide, in fact, the stars within them will just glide past one another without any p ...
Hubble Space Telescope Image
... distant galaxies, which lie five to 10 times farther than Abell 2218. This distant population existed when the universe was just a quarter of its current age. ...
... distant galaxies, which lie five to 10 times farther than Abell 2218. This distant population existed when the universe was just a quarter of its current age. ...
Universe 8e Lecture Chapter 24 Galaxies
... The Dark-Matter Problem: The luminous mass of a cluster of galaxies is not large enough to account for the observed motions of the galaxies; a large amount of unobserved mass must also be present. This situation is called the dark-matter problem. Hot intergalactic gases in rich clusters account for ...
... The Dark-Matter Problem: The luminous mass of a cluster of galaxies is not large enough to account for the observed motions of the galaxies; a large amount of unobserved mass must also be present. This situation is called the dark-matter problem. Hot intergalactic gases in rich clusters account for ...
lecture outlines
... 2. The life and times of Nicholas Copernicus 3. The Gregorian Calendar reform 4. The Copernican System: a description- circles and heliocentricism 5. The Copernican System: an explanation- the 3 motions of the heavens 6. The Copernican System: an evaluation- stellar parallax, planetary predictions, ...
... 2. The life and times of Nicholas Copernicus 3. The Gregorian Calendar reform 4. The Copernican System: a description- circles and heliocentricism 5. The Copernican System: an explanation- the 3 motions of the heavens 6. The Copernican System: an evaluation- stellar parallax, planetary predictions, ...
Spectroscopic confirmation of a galaxy at redshift z=8.6
... Figure 1 | Two representations of the spectrum of UDFy-38135539 showing its significance. a, The spectrum shows a faint emission line detected at 6s significance at a wavelength of 11,615.6 Å, corresponding to a redshift of z 5 8.5549 6 0.0020 for Lya. The integrated spectrum was extracted from a s ...
... Figure 1 | Two representations of the spectrum of UDFy-38135539 showing its significance. a, The spectrum shows a faint emission line detected at 6s significance at a wavelength of 11,615.6 Å, corresponding to a redshift of z 5 8.5549 6 0.0020 for Lya. The integrated spectrum was extracted from a s ...
electric charge - National Physical Laboratory
... • We call forces ‘magnetic’ when both particles are moving with respect to us. • They are still electrical in origin. • This was first explained by Albert Einstein in his Theory of Relativity ...
... • We call forces ‘magnetic’ when both particles are moving with respect to us. • They are still electrical in origin. • This was first explained by Albert Einstein in his Theory of Relativity ...
3. Cosmology and the Origin and Evolution of Galaxies
... (SEDs) of mm galaxies at rest-frame mid-IR to radio wavelengths can provide photometric-redshifts with sufficient accuracy7. There has also been some success in the measurement of optical and IR spectroscopic redshifts for a fraction of the bright mm galaxies (S850µm > 5 mJy) with reliable radio coun ...
... (SEDs) of mm galaxies at rest-frame mid-IR to radio wavelengths can provide photometric-redshifts with sufficient accuracy7. There has also been some success in the measurement of optical and IR spectroscopic redshifts for a fraction of the bright mm galaxies (S850µm > 5 mJy) with reliable radio coun ...
presentation (PPT format)
... Given their period you can get their luminosity (Period-Luminosity relationship) (you also have to determine if it’s a Type I or Type II Cepheid metal poor or rich; different period-luminosity relationships ...
... Given their period you can get their luminosity (Period-Luminosity relationship) (you also have to determine if it’s a Type I or Type II Cepheid metal poor or rich; different period-luminosity relationships ...
talk.wyse - Johns Hopkins University
... Milky Way evolve through merging and assimilation of smaller systems. Highest resolution N-body simulations (gravity only) show persistent small-scale substructure, with many more darkmatter subhaloes surviving to the present-day than we see as satellite galaxies around the Milky Way or Andromeda Ga ...
... Milky Way evolve through merging and assimilation of smaller systems. Highest resolution N-body simulations (gravity only) show persistent small-scale substructure, with many more darkmatter subhaloes surviving to the present-day than we see as satellite galaxies around the Milky Way or Andromeda Ga ...
ISP 205: Visions of the Universe
... More detailed study of the Milky Way’s rotation reveals one of the greatest mysteries in astronomy… Most of Milky Way’s light comes from disk and bulge … ...
... More detailed study of the Milky Way’s rotation reveals one of the greatest mysteries in astronomy… Most of Milky Way’s light comes from disk and bulge … ...
2013. CCAT. All Rights Reserved.
... is a tiny fraction of the total bolometric energy, so substantial (and uncertain) dust corrections are required. CCAT cameras will identify broadly high-redshift dusty galaxies using flux ratios, but flux ratios do not provide an accurate redshift (unlike in the UV / optical in which there is a brea ...
... is a tiny fraction of the total bolometric energy, so substantial (and uncertain) dust corrections are required. CCAT cameras will identify broadly high-redshift dusty galaxies using flux ratios, but flux ratios do not provide an accurate redshift (unlike in the UV / optical in which there is a brea ...
Lecture 12: Galaxies View of the Galaxy from within Comparison to
... • Plotting the sky brightness in galactic coordinates, we see that the stars form a band across the sky, suggesting that we are embedded within a stellar disk. • Interstellar dust absorbs light in the plane of the galactic disk. ...
... • Plotting the sky brightness in galactic coordinates, we see that the stars form a band across the sky, suggesting that we are embedded within a stellar disk. • Interstellar dust absorbs light in the plane of the galactic disk. ...
Physical cosmology
Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate. For most of human history, it was a branch of metaphysics and religion. Cosmology as a science originated with the Copernican principle, which implies that celestial bodies obey identical physical laws to those on Earth, and Newtonian mechanics, which first allowed us to understand those physical laws.Physical cosmology, as it is now understood, began with the development in 1915 of Albert Einstein's general theory of relativity, followed by major observational discoveries in the 1920s: first, Edwin Hubble discovered that the universe contains a huge number of external galaxies beyond our own Milky Way; then, work by Vesto Slipher and others showed that the universe is expanding. These advances made it possible to speculate about the origin of the universe, and allowed the establishment of the Big Bang Theory, by Georges Lemaitre, as the leading cosmological model. A few researchers still advocate a handful of alternative cosmologies; however, most cosmologists agree that the Big Bang theory explains the observations better.Dramatic advances in observational cosmology since the 1990s, including the cosmic microwave background, distant supernovae and galaxy redshift surveys, have led to the development of a standard model of cosmology. This model requires the universe to contain large amounts of dark matter and dark energy whose nature is currently not well understood, but the model gives detailed predictions that are in excellent agreement with many diverse observations.Cosmology draws heavily on the work of many disparate areas of research in theoretical and applied physics. Areas relevant to cosmology include particle physics experiments and theory, theoretical and observational astrophysics, general relativity, quantum mechanics, and plasma physics.