radio loudness. - Rencontres de Moriond
... - multiwavelength studies with previously unseen accuracy allow better understanding of jet kinematics, its structure, radiation mechanisms and environments - unified picture of relativistic outflows: quasars, microquasars [Chaty's talk] and gamma-ray bursts (Mirabel 2003; Ghisellini 2003) [De Rujul ...
... - multiwavelength studies with previously unseen accuracy allow better understanding of jet kinematics, its structure, radiation mechanisms and environments - unified picture of relativistic outflows: quasars, microquasars [Chaty's talk] and gamma-ray bursts (Mirabel 2003; Ghisellini 2003) [De Rujul ...
Connecting Stars, Galaxies and the Universe
... of detached eclipsing binaries (DEBs) will be particularly useful. For DEBs within 1.5 kpc or so, SIM-Lite can measure distances to better than ½%, which makes it possible to determine their ages with similar accuracies as can be accomplished with cosmological methods1. This “d½%sample” would be the ...
... of detached eclipsing binaries (DEBs) will be particularly useful. For DEBs within 1.5 kpc or so, SIM-Lite can measure distances to better than ½%, which makes it possible to determine their ages with similar accuracies as can be accomplished with cosmological methods1. This “d½%sample” would be the ...
Invited Talks at Major Meetings Andreas Albrecht Updated 8/31
... 29. The cosmic defect story Review talk at the 1998 Moriond meeting: Fundamental Parameters in Cosmology, Les Arcs January 1998 30. New paradigms in active structure formation CAPCC 98, CERN, June 1998 31. Cosmology with a time varying speed of light Cosmo-98, Asilomar 1998 32. Cosmology with a tim ...
... 29. The cosmic defect story Review talk at the 1998 Moriond meeting: Fundamental Parameters in Cosmology, Les Arcs January 1998 30. New paradigms in active structure formation CAPCC 98, CERN, June 1998 31. Cosmology with a time varying speed of light Cosmo-98, Asilomar 1998 32. Cosmology with a tim ...
1/2 - Indico
... first few seconds of the history of the universe the radiation had a temperature of ~1010 oK. The present day temperature of 2.76 oK has come about because in the expansion of the universe the radiation has constantly cooled from its initially extremely hot state. Radiation & matter dominated era : ...
... first few seconds of the history of the universe the radiation had a temperature of ~1010 oK. The present day temperature of 2.76 oK has come about because in the expansion of the universe the radiation has constantly cooled from its initially extremely hot state. Radiation & matter dominated era : ...
Slide 1
... • One of our favorite reasons is to look at the atomic hydrogen clouds in the Milky Way. • The clouds lay very far out from the galactic center (further out than our sun) and are rotating faster than they should be if they were just feeling the gravity of the mass we can “see” Big Bang, Black Early ...
... • One of our favorite reasons is to look at the atomic hydrogen clouds in the Milky Way. • The clouds lay very far out from the galactic center (further out than our sun) and are rotating faster than they should be if they were just feeling the gravity of the mass we can “see” Big Bang, Black Early ...
Why Our Universe is Comprehensible
... The basic theoretical inputs for predicting what goes on in the box are the Hamiltonian H governing evolution and quantum state |Ψi, written here in the Heisenberg picture for convenience, and assumed pure for simplicity. Input theory is then (H, |Ψi). The basic output of the theory are the probabil ...
... The basic theoretical inputs for predicting what goes on in the box are the Hamiltonian H governing evolution and quantum state |Ψi, written here in the Heisenberg picture for convenience, and assumed pure for simplicity. Input theory is then (H, |Ψi). The basic output of the theory are the probabil ...
(NATS) 1585 3 - York University – Faculty of Science
... • Describe how the Doppler effect for light is used to determine how fast a distant object is approaching us or receding from us. • Demonstrate (by drawing arrows on 3 galaxies lined up in a row) how all galaxies move away from each other as the universe expands. • Describe why we cannot directly se ...
... • Describe how the Doppler effect for light is used to determine how fast a distant object is approaching us or receding from us. • Demonstrate (by drawing arrows on 3 galaxies lined up in a row) how all galaxies move away from each other as the universe expands. • Describe why we cannot directly se ...
The Hubble Space Telescope
... telling us a great deal about the chemical evolution of the Universe. Even more exciting are the discoveries that were totally unanticipated and that have opened new avenues to our knowledge of the cosmos, such as the discovery of the acceleration of the Universe, which implies the existence of the ...
... telling us a great deal about the chemical evolution of the Universe. Even more exciting are the discoveries that were totally unanticipated and that have opened new avenues to our knowledge of the cosmos, such as the discovery of the acceleration of the Universe, which implies the existence of the ...
Word
... The Big Bang theory of the Universe states that the Universe was created in a massive explosion from a point when space, time and matter were created. This event is thought to have occurred about 14 billion years ago. As the Universe expanded and cooled, first nucleons, then nuclei, atoms, molecules ...
... The Big Bang theory of the Universe states that the Universe was created in a massive explosion from a point when space, time and matter were created. This event is thought to have occurred about 14 billion years ago. As the Universe expanded and cooled, first nucleons, then nuclei, atoms, molecules ...
doc - IAC
... Observatory (France) studies the telltale traces of the chemical elements in the spectra of, for example, planetary nebulae, which, apart from being among the most beautiful objects in the sky, are also of great use to astronomers. For this reason, Stasinska is one of the lecturers of the XVIII Wint ...
... Observatory (France) studies the telltale traces of the chemical elements in the spectra of, for example, planetary nebulae, which, apart from being among the most beautiful objects in the sky, are also of great use to astronomers. For this reason, Stasinska is one of the lecturers of the XVIII Wint ...
hanson.pdf
... of the universe — rather than radiation or matter Carroll, 1999a. The physical processes of the very young universe are believed to be accurately described by the “standard model” of elementary particle physics, with plasmas of quarks, gluons, leptons, and photons gradually cooling down to form hydr ...
... of the universe — rather than radiation or matter Carroll, 1999a. The physical processes of the very young universe are believed to be accurately described by the “standard model” of elementary particle physics, with plasmas of quarks, gluons, leptons, and photons gradually cooling down to form hydr ...
Matter and antimatter in the same universe?
... relativity), or pictures like the Stationary Universe which seems not able to t a k e into account some experimental observations (like the red-shift, the 2.7K background radiation and the quasar distribution peak at (7 + 9) billion light-y). We will thus proceed in the framework of the Big Bang the ...
... relativity), or pictures like the Stationary Universe which seems not able to t a k e into account some experimental observations (like the red-shift, the 2.7K background radiation and the quasar distribution peak at (7 + 9) billion light-y). We will thus proceed in the framework of the Big Bang the ...
Anthropic Arguments
... While this is an incredibly long period of time, it is possible that we are the first intelligent creatures to evolve in the universe. Most scientists believe that the evolution of life depends on carbon. Carbon atoms are the only ones that can link together in long chain molecules. This is importan ...
... While this is an incredibly long period of time, it is possible that we are the first intelligent creatures to evolve in the universe. Most scientists believe that the evolution of life depends on carbon. Carbon atoms are the only ones that can link together in long chain molecules. This is importan ...
ch 15 notes
... The Future of the Universe New observation lead astronomers to believe that the universe will likely expand forever . . . Astronomer, Vera Rubin, discovered that the matter we can see (stars, nebulas, etc.) only makes up about 10% of the mass in galaxies. Most of the matter in space is dark matter, ...
... The Future of the Universe New observation lead astronomers to believe that the universe will likely expand forever . . . Astronomer, Vera Rubin, discovered that the matter we can see (stars, nebulas, etc.) only makes up about 10% of the mass in galaxies. Most of the matter in space is dark matter, ...
Chapter 15 Stars, Galaxies, and Universe Galaxies
... The Future of the Universe New observation lead astronomers to believe that the universe will likely expand forever . . . Astronomer, Vera Rubin, discovered that the matter we can see (stars, nebulas, etc.) only makes up about 10% of the mass in galaxies. Most of the matter in space is dark matter, ...
... The Future of the Universe New observation lead astronomers to believe that the universe will likely expand forever . . . Astronomer, Vera Rubin, discovered that the matter we can see (stars, nebulas, etc.) only makes up about 10% of the mass in galaxies. Most of the matter in space is dark matter, ...
Galaxies
... • We tend to give credit to Hubble for the first observation that the Universe is expanding. • However Hubble wasn’t the first to show the linear relationship between velocity and distance (the Hubble Law) and did not connect this to an expanding Universe • George Lemaitre did this in 1926 (using ...
... • We tend to give credit to Hubble for the first observation that the Universe is expanding. • However Hubble wasn’t the first to show the linear relationship between velocity and distance (the Hubble Law) and did not connect this to an expanding Universe • George Lemaitre did this in 1926 (using ...
cosmoatomis m tic
... nothing more than the core of its galaxy. The most striking similarity between these two expressions of matter is the fact that—except for animals—atoms and galaxies are the only natural structures equipped with autonomous movement, that is, of their own life! Note: The brief statement above is redu ...
... nothing more than the core of its galaxy. The most striking similarity between these two expressions of matter is the fact that—except for animals—atoms and galaxies are the only natural structures equipped with autonomous movement, that is, of their own life! Note: The brief statement above is redu ...
Clusters of Galaxies
... probably retain all the enriched material created in them" "•Measurement of the elemental abundances and their evolution provide fundamental data for the origin of the elements " "•The distribution of the elements in the clusters reveals how the metals were removed from stellar systems into the IGM ...
... probably retain all the enriched material created in them" "•Measurement of the elemental abundances and their evolution provide fundamental data for the origin of the elements " "•The distribution of the elements in the clusters reveals how the metals were removed from stellar systems into the IGM ...
The Total Mass-Energy of the Universe
... they will say, was created in the Big Bang. So there was no before and we should not worry about the conservation issue. But does this not strike you as sophistry? Perhaps it is sound physics, but it leaves one feeling less than satisfied. The reason is that it removes the instant of creation from t ...
... they will say, was created in the Big Bang. So there was no before and we should not worry about the conservation issue. But does this not strike you as sophistry? Perhaps it is sound physics, but it leaves one feeling less than satisfied. The reason is that it removes the instant of creation from t ...
distance
... We see distant galaxies as young galaxies: looking back in time to learn what galaxies were like when they were young. ...
... We see distant galaxies as young galaxies: looking back in time to learn what galaxies were like when they were young. ...
black holes are created when stars collapse and die from burning its
... • the core is extremely cold at absolute zero, and the more distance spread outward, the more hot it gets, reaching temperatures ranging in the hundreds of billions at some points • the atmosphere of galaxies is just clusters of gases, mostly hydrogen and helium, that are trapped in the gravitationa ...
... • the core is extremely cold at absolute zero, and the more distance spread outward, the more hot it gets, reaching temperatures ranging in the hundreds of billions at some points • the atmosphere of galaxies is just clusters of gases, mostly hydrogen and helium, that are trapped in the gravitationa ...
Dark and baryonic matter in the MareNostrum Universe
... The standard model of cosmological structure formation is based on the idea of an early inflationary phase of the evolution of the Universe. According to the simplest models of inflation during this phase fluctuations with a scale free power spectrum have been created. On large scales this power spe ...
... The standard model of cosmological structure formation is based on the idea of an early inflationary phase of the evolution of the Universe. According to the simplest models of inflation during this phase fluctuations with a scale free power spectrum have been created. On large scales this power spe ...
Thursday, August 4, 2011
... One can obtain flat space as a subtle limit of AdS, and the flat-space S-matrix as a suitable limit of correlation functions in the dual quantum field theory. This gives us a precise formulation of quantum gravity in (asymptotically) AdS spaces, and flat space as a limit. Now, finally, let me get t ...
... One can obtain flat space as a subtle limit of AdS, and the flat-space S-matrix as a suitable limit of correlation functions in the dual quantum field theory. This gives us a precise formulation of quantum gravity in (asymptotically) AdS spaces, and flat space as a limit. Now, finally, let me get t ...
The First Stars in the Universe
... universe of 13.7 billion years). Researchers will need better telescopes to see more distant objects dating from still earlier times. Cosmologists, however, can make deductions about the early universe based on the cosmic microwave background radiation, which was emitted about 400,000 years after th ...
... universe of 13.7 billion years). Researchers will need better telescopes to see more distant objects dating from still earlier times. Cosmologists, however, can make deductions about the early universe based on the cosmic microwave background radiation, which was emitted about 400,000 years after th ...
Big Bang
The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. The model accounts for the fact that the universe expanded from a very high density and high temperature state, and offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background, large scale structure, and Hubble's Law. If the known laws of physics are extrapolated beyond where they are valid, there is a singularity. Modern measurements place this moment at approximately 13.8 billion years ago, which is thus considered the age of the universe. After the initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms. Giant clouds of these primordial elements later coalesced through gravity to form stars and galaxies.Since Georges Lemaître first noted, in 1927, that an expanding universe might be traced back in time to an originating single point, scientists have built on his idea of cosmic expansion. While the scientific community was once divided between supporters of two different expanding universe theories, the Big Bang and the Steady State theory, accumulated empirical evidence provides strong support for the former. In 1929, from analysis of galactic redshifts, Edwin Hubble concluded that galaxies are drifting apart, important observational evidence consistent with the hypothesis of an expanding universe. In 1965, the cosmic microwave background radiation was discovered, which was crucial evidence in favor of the Big Bang model, since that theory predicted the existence of background radiation throughout the universe before it was discovered. More recently, measurements of the redshifts of supernovae indicate that the expansion of the universe is accelerating, an observation attributed to dark energy's existence. The known physical laws of nature can be used to calculate the characteristics of the universe in detail back in time to an initial state of extreme density and temperature.