The high density QCD phase transition in compact stars
... • The dynamics of the formation of quark matter in compact stars might provide clear signatures in the neutrino signal (measurable in SuperK & IceCube). Possible mechanism for supernova explosions !!! ...
... • The dynamics of the formation of quark matter in compact stars might provide clear signatures in the neutrino signal (measurable in SuperK & IceCube). Possible mechanism for supernova explosions !!! ...
Sample Exam for Final (with correct answers)
... (e) We know the times of giant explosions in these galaxies, then measure the time the light signals arrive at Earth. 23. The physical significance of the Hubble Constant is that it (a) corresponds to the time since the universe began to expand. ∗ (b) gives the total mass of the universe. (c) repres ...
... (e) We know the times of giant explosions in these galaxies, then measure the time the light signals arrive at Earth. 23. The physical significance of the Hubble Constant is that it (a) corresponds to the time since the universe began to expand. ∗ (b) gives the total mass of the universe. (c) repres ...
Integrative Studies 410 Our Place in the Universe
... 1 million Ly (modern value: 2.2 mill. Ly) • Conclusion: it is 20 times more distant than the milky way’s radius Extragalacticity! Shapley’s theory falsified! ...
... 1 million Ly (modern value: 2.2 mill. Ly) • Conclusion: it is 20 times more distant than the milky way’s radius Extragalacticity! Shapley’s theory falsified! ...
Cosmological Aspects of Nucleosynthesis
... More than 3 neutrino-families would have contributed to the mass density of ultrarelativistic particles. This would have speeded up the expansion in the radiationdominated universe. Neutrino would decouple at higher temperature and Helium ...
... More than 3 neutrino-families would have contributed to the mass density of ultrarelativistic particles. This would have speeded up the expansion in the radiationdominated universe. Neutrino would decouple at higher temperature and Helium ...
Earlier examination problems
... atomic binding energies, T ≈ 5 eV. Assume also that the universe before this decoupling was radiation-dominated. What is the age of the universe based on these measurements and assumptions, and what was its age at the time of decoupling? 38. With the assumptions made in the previous problem, show th ...
... atomic binding energies, T ≈ 5 eV. Assume also that the universe before this decoupling was radiation-dominated. What is the age of the universe based on these measurements and assumptions, and what was its age at the time of decoupling? 38. With the assumptions made in the previous problem, show th ...
the nuclear, plasma, and radiation universe
... values of energy are involved. This force of nature expresses itself the process of radioactivity, where isotopes of different elements, either naturally occurring, or artificially created transform into other isotopes. It is the dream of the ancient alchemists come true. Radioisotopes can have dele ...
... values of energy are involved. This force of nature expresses itself the process of radioactivity, where isotopes of different elements, either naturally occurring, or artificially created transform into other isotopes. It is the dream of the ancient alchemists come true. Radioisotopes can have dele ...
Mach`s Principle and the Concept of Mass
... based on his bucket argument. In his book Philosophiae Naturalis Principia Mathematica [6] (Latin for “Mathematical Principles of Natural Philosophy”) Newton tried to demonstrate that one can always decide if one is rotating with respect to absolute space by measuring the apparent forces that arise ...
... based on his bucket argument. In his book Philosophiae Naturalis Principia Mathematica [6] (Latin for “Mathematical Principles of Natural Philosophy”) Newton tried to demonstrate that one can always decide if one is rotating with respect to absolute space by measuring the apparent forces that arise ...
PoS(AASKA14)174 - Proceeding of science
... The realisation that stars like our Sun have a finite lifetime emerged in the early 1900s. This was followed by the comforting conjecture that the Universe was essentially in a “steady state” with a constant rate of stars ageing and being replaced. What instead became apparent in the late 1990’s is ...
... The realisation that stars like our Sun have a finite lifetime emerged in the early 1900s. This was followed by the comforting conjecture that the Universe was essentially in a “steady state” with a constant rate of stars ageing and being replaced. What instead became apparent in the late 1990’s is ...
**** 1 - Asiaa
... constant with time, we can adopt the Local bulgeblack hole mass relation to high-z Universe. 2. At z > 10, quasar density is expected to decrease significantly, and GRBs are good candidate radio ...
... constant with time, we can adopt the Local bulgeblack hole mass relation to high-z Universe. 2. At z > 10, quasar density is expected to decrease significantly, and GRBs are good candidate radio ...
Cosmic Hide and Seek: the Search for the Missing Mass
... gravity. We still see the effects of that force when we see red-shifted galaxies. Clumping. One of the problems with the Big Bang theory is its failure to explain how stars and galaxies could form in a young universe that was evenly distributed in all directions. What started the clumping? In a smoo ...
... gravity. We still see the effects of that force when we see red-shifted galaxies. Clumping. One of the problems with the Big Bang theory is its failure to explain how stars and galaxies could form in a young universe that was evenly distributed in all directions. What started the clumping? In a smoo ...
PDF sample - Northern Central Hospital
... the first time, the reality of the previously hidden atomic world was beginning to make itself manifest. It is difficult today to fully appreciate how recent is the notion that atoms are real physical entities, and not mere mathematical or philosophical constructs. Even in 1906, scientists did not ...
... the first time, the reality of the previously hidden atomic world was beginning to make itself manifest. It is difficult today to fully appreciate how recent is the notion that atoms are real physical entities, and not mere mathematical or philosophical constructs. Even in 1906, scientists did not ...
Universe, Dark Energy and Dark Matter
... distribution but also to the law of increase of their velocities as they move away from us. How can it be explained? It may be suggested that man takes the central position in the Universe and all the galaxies are running away from us. Other scientists state that the Universe is uniform by structure ...
... distribution but also to the law of increase of their velocities as they move away from us. How can it be explained? It may be suggested that man takes the central position in the Universe and all the galaxies are running away from us. Other scientists state that the Universe is uniform by structure ...
Review (PPT) - Uplift Summit Intl
... In most stars these forces are balanced over long periods but in Cepheid variables they seem to take turns, a bit like a mass bouncing up and down on a spring. The period of these stars varies between twelve hours and a hundred days. Because they are so luminous it means that very distant Cepheids c ...
... In most stars these forces are balanced over long periods but in Cepheid variables they seem to take turns, a bit like a mass bouncing up and down on a spring. The period of these stars varies between twelve hours and a hundred days. Because they are so luminous it means that very distant Cepheids c ...
Ch. 25 - UTK Department of Physics and Astronomy
... This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permit ...
... This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permit ...
The Hubble Law
... An important property of Cepheids was discovered by astronomer Henrietta Leavitt a century ago. She spent many years cataloguing Cepheid variables, especially their brightness and period of brightness change. As Miss Leavitt wrote in 1908, ‘It is worthy of notice . . . that the brighter variables ha ...
... An important property of Cepheids was discovered by astronomer Henrietta Leavitt a century ago. She spent many years cataloguing Cepheid variables, especially their brightness and period of brightness change. As Miss Leavitt wrote in 1908, ‘It is worthy of notice . . . that the brighter variables ha ...
What are your ideas about The Universe? - Harvard
... 4.5 billion years old. But the Hubble “deep-field” galaxies are among the most ancient and distant objects we can see in the sky. The light from them has taken about 10 billion years to reach us. So they were born long before the Sun. On the other hand, the Hubble deep field galaxies are young! Beca ...
... 4.5 billion years old. But the Hubble “deep-field” galaxies are among the most ancient and distant objects we can see in the sky. The light from them has taken about 10 billion years to reach us. So they were born long before the Sun. On the other hand, the Hubble deep field galaxies are young! Beca ...
The Interstellar Medium - University of St Andrews
... At very early times, photons are typically energetic enough that they interact strongly with matter so the whole universe sits at a temperature dictated by the radiation. The energy state of matter changes as a function of its temperature and so a number of key events in the history of the universe ...
... At very early times, photons are typically energetic enough that they interact strongly with matter so the whole universe sits at a temperature dictated by the radiation. The energy state of matter changes as a function of its temperature and so a number of key events in the history of the universe ...
Galaxies and the Universe bb
... • _____ extending from nucleus • About 30% of all galaxies • Large diameter of 20,000 to 125,000 light years • Contains both _______ and ___ stars ...
... • _____ extending from nucleus • About 30% of all galaxies • Large diameter of 20,000 to 125,000 light years • Contains both _______ and ___ stars ...
Big Bang Theory - Clark Planetarium
... • With most electrons now bound in atoms, photons can travel large distances without being scattered by free electrons. Photons now travel in all directions, resulting in what is called the cosmic background radiation. ...
... • With most electrons now bound in atoms, photons can travel large distances without being scattered by free electrons. Photons now travel in all directions, resulting in what is called the cosmic background radiation. ...
A Field Theory approach to important Cosmological Issues including
... Density of the Field Configurations We demonstrated that the Energy Density moves radially inwards as collapse occurs Finally, we integrated the energy density and looked at the masses of collapsed objects formed. The result we obtained was that the masses of collapsed objects are given by ...
... Density of the Field Configurations We demonstrated that the Energy Density moves radially inwards as collapse occurs Finally, we integrated the energy density and looked at the masses of collapsed objects formed. The result we obtained was that the masses of collapsed objects are given by ...
DSSU, the Non-Expanding Universe: Structure, Redshift, Distance
... between successive crests of a wave. A redshift can occur in all kinds of radiation, from the very shortest gamma rays and X-rays, through to the increasingly longer ultraviolet rays, visible light, infrared rays, and finally to the short and long radio waves. If the original wavelength is known fro ...
... between successive crests of a wave. A redshift can occur in all kinds of radiation, from the very shortest gamma rays and X-rays, through to the increasingly longer ultraviolet rays, visible light, infrared rays, and finally to the short and long radio waves. If the original wavelength is known fro ...
Home Work Set # 4, Physics 217, Due: October 3, 2001
... In this problem we will explore a fourth way of calculating the electrostatic potential energy of the uniformly charged sphere of problem 6. Assemble the sphere layer by layer, each time bringing in an infinitesimal charge dq from far away and smearing it uniformly over the surface, thereby increasi ...
... In this problem we will explore a fourth way of calculating the electrostatic potential energy of the uniformly charged sphere of problem 6. Assemble the sphere layer by layer, each time bringing in an infinitesimal charge dq from far away and smearing it uniformly over the surface, thereby increasi ...
Chapter 16 Galaxies and Dark Matter
... This “Lyman-alpha forest” is the result of quasar light passing through hundreds of gas clouds, each with a different redshift, on its way to us. ...
... This “Lyman-alpha forest” is the result of quasar light passing through hundreds of gas clouds, each with a different redshift, on its way to us. ...
Exam #: Printed Name: Signature: PHYSICS DEPARTMENT
... A particle of mass m moves from (space, time) coordinate (0,0) to (X, T ). For simplicity, assume both X and T are positive. Calculate the action of its path in the case of (a) A free particle, for which L = 12 mẋ2 . (b) A particle in a potential V (x) = mx where is very small: give the result o ...
... A particle of mass m moves from (space, time) coordinate (0,0) to (X, T ). For simplicity, assume both X and T are positive. Calculate the action of its path in the case of (a) A free particle, for which L = 12 mẋ2 . (b) A particle in a potential V (x) = mx where is very small: give the result o ...
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.