Evidence of the accelerated expansion of the Universe from weak
... new constituent named dark energy, which counteracts the attractive force of gravity on the largest scales and contributes ∼70% to the total energy budget today. There have been various attempts to explain dark energy, ranging from Einstein’s cosmological constant, via a dynamic fluid named quintess ...
... new constituent named dark energy, which counteracts the attractive force of gravity on the largest scales and contributes ∼70% to the total energy budget today. There have been various attempts to explain dark energy, ranging from Einstein’s cosmological constant, via a dynamic fluid named quintess ...
arXiv:astro-ph/9701131v1 18 Jan 1997
... evolution of planets, stars, stellar populations, galaxies, and the universe itself over time scales which greatly exceed the current age of the universe. Our discussion starts with new stellar evolution calculations which follow the future evolution of the low mass (M type) stars that dominate the ...
... evolution of planets, stars, stellar populations, galaxies, and the universe itself over time scales which greatly exceed the current age of the universe. Our discussion starts with new stellar evolution calculations which follow the future evolution of the low mass (M type) stars that dominate the ...
Simulations of the galaxy population constrained by observations
... required to change. Re-accretion must be less efficient than originally assumed at early times, and more efficient at late times. We use the MCMC scheme to identify a simple modification of the treatment of this process which can explain the data simultaneously at all redshifts. We then test this pr ...
... required to change. Re-accretion must be less efficient than originally assumed at early times, and more efficient at late times. We use the MCMC scheme to identify a simple modification of the treatment of this process which can explain the data simultaneously at all redshifts. We then test this pr ...
course objectives - Metropolitan Community College
... COURSE DESCRIPTION: This course is an introductory course in astronomy that covers the tools of astronomy, the night sky, the solar system, stars and star systems, galaxies, and cosmology. This is a lecture-only course. The lab course that complements this course is SCIE 1310. ...
... COURSE DESCRIPTION: This course is an introductory course in astronomy that covers the tools of astronomy, the night sky, the solar system, stars and star systems, galaxies, and cosmology. This is a lecture-only course. The lab course that complements this course is SCIE 1310. ...
D-particles
... D-particles defects are point-like with masses Ms/gs Ms = sting mass scale (free, in general Ms ≠ MPlnack) gs = string scale (assumed weak, gs < 1 ) Recoil implies distortion of surrounding space-time, analogy with open strings in Background electric fields : Recoil velocity ui plays role of Electri ...
... D-particles defects are point-like with masses Ms/gs Ms = sting mass scale (free, in general Ms ≠ MPlnack) gs = string scale (assumed weak, gs < 1 ) Recoil implies distortion of surrounding space-time, analogy with open strings in Background electric fields : Recoil velocity ui plays role of Electri ...
Constraining the Contribution of Galaxies and Active Galactic Nuclei
... with energies above 54.4eV are required for doubly ionizing helium, AGNs are the most promising ionizing sources at the epoch when helium in the IGM is fully ionized, i.e. z ∼ 3 (Becker et al. 2011; Worseck et al. 2014). However, it was traditionally believed that the contribution of AGNs to reioniz ...
... with energies above 54.4eV are required for doubly ionizing helium, AGNs are the most promising ionizing sources at the epoch when helium in the IGM is fully ionized, i.e. z ∼ 3 (Becker et al. 2011; Worseck et al. 2014). However, it was traditionally believed that the contribution of AGNs to reioniz ...
Slide 1
... • LOTS we COULD say about QM, but since we could spend years on this we’ll focus only on the most important points you need Physics We Need Big Bang, Black Holes, No Math Topic 3: Quantum Mechanics and Atoms ...
... • LOTS we COULD say about QM, but since we could spend years on this we’ll focus only on the most important points you need Physics We Need Big Bang, Black Holes, No Math Topic 3: Quantum Mechanics and Atoms ...
(DOC, Unknown) - Natural Philosophy Alliance
... [email protected] Abstract For the first time in the human & scientific history the concepts of absolute space, emergent & relative time and aether or ether of classical physics (dark energy of modern physics now named as Luminiferous Energy) have been conceived simultaneously. The mystery of the ...
... [email protected] Abstract For the first time in the human & scientific history the concepts of absolute space, emergent & relative time and aether or ether of classical physics (dark energy of modern physics now named as Luminiferous Energy) have been conceived simultaneously. The mystery of the ...
Lecture notes 18: Galaxies and galaxy clusters
... sky may also be distant disklike systems similar to our own but seperate. Kant called these objects island universes. Charles Messier (1730–1817) compiled a list of 103 nebulae, many of these Messier Objects are indeed known today to be island universes or seperate galaxies, such as M31 in Andromeda ...
... sky may also be distant disklike systems similar to our own but seperate. Kant called these objects island universes. Charles Messier (1730–1817) compiled a list of 103 nebulae, many of these Messier Objects are indeed known today to be island universes or seperate galaxies, such as M31 in Andromeda ...
Research Papers-Cosmology/Download/6307
... century the Earth hurried more than 1s in the year. After 1900 year, it was lagged less than 1s in the year. Since 1920 year she began again to hurry. ...
... century the Earth hurried more than 1s in the year. After 1900 year, it was lagged less than 1s in the year. Since 1920 year she began again to hurry. ...
Founders of Modern Astronomy
... The progress of science has been uneven in the sense that there are periods when it has progressed at a very high pace and there are periods when there was hardly any progress or it progressed slowly. This is true for every discipline of science. The different branches of science are not mutually ex ...
... The progress of science has been uneven in the sense that there are periods when it has progressed at a very high pace and there are periods when there was hardly any progress or it progressed slowly. This is true for every discipline of science. The different branches of science are not mutually ex ...
(Real) Time Machine Demonstration Manual
... The Big Bang model of the origin of the universe states that the universe originated in a very hot, very dense state 12-15 billion years ago and has been expanding and cooling ever since. In 1948, physicists George Gamow, Ralph Alpher, and Robert Herman predicted that there must be light throughout ...
... The Big Bang model of the origin of the universe states that the universe originated in a very hot, very dense state 12-15 billion years ago and has been expanding and cooling ever since. In 1948, physicists George Gamow, Ralph Alpher, and Robert Herman predicted that there must be light throughout ...
Galaxy formation in the Planck cosmology - II. Star
... over time. The latter follows only the history of the main component of the galaxy (along the ‘main branch’ of the merger tree) and has been investigated for the Millennium Simulation by Cohn & van de Voort (2015). The difference between the two reflects the merger history of galaxies. The term SFH ...
... over time. The latter follows only the history of the main component of the galaxy (along the ‘main branch’ of the merger tree) and has been investigated for the Millennium Simulation by Cohn & van de Voort (2015). The difference between the two reflects the merger history of galaxies. The term SFH ...
Using time to measure distance - AS-A2
... 11. In the 1920s. Vesto Slipher and Edwin Hubble gathered data that showed that distant galaxies are all moving away from us and that the speed at which they are moving away is directly proportional to their distance. How do cosmologists account for these observations? ...
... 11. In the 1920s. Vesto Slipher and Edwin Hubble gathered data that showed that distant galaxies are all moving away from us and that the speed at which they are moving away is directly proportional to their distance. How do cosmologists account for these observations? ...
An Expanded View of the Universe
... Fundamental physics: are the laws of nature universal? As far back in time and as far out in distance as we can observe, all the phenomena investigated so far seem to indicate that the laws of physics are universal and unchanging. Yet, uncomfortable gaps exist in our understanding: gravity and gener ...
... Fundamental physics: are the laws of nature universal? As far back in time and as far out in distance as we can observe, all the phenomena investigated so far seem to indicate that the laws of physics are universal and unchanging. Yet, uncomfortable gaps exist in our understanding: gravity and gener ...
2007 Joint Fall Meeting of the Texas Sections of the APS and AAPT
... case that one can anticipate where great breakthroughs in science will occur, and even harder to anticipate where these breakthroughs will find applications to benefit mankind. In this talk the speaker will trace the development of NMR as an example of a development for which the applications were n ...
... case that one can anticipate where great breakthroughs in science will occur, and even harder to anticipate where these breakthroughs will find applications to benefit mankind. In this talk the speaker will trace the development of NMR as an example of a development for which the applications were n ...
Practical cosmology with the Local Volume galaxies
... constellation. According to Tully et al. (2008) this phenomena (the Local Velocity Anomaly) is caused by motion of the Local Sheet as a whole from the large Local Void towards the neighboring Leo cloud. Fig.2 presents the distribution of nearby galaxies in Supergalactic coordinates. The vector exten ...
... constellation. According to Tully et al. (2008) this phenomena (the Local Velocity Anomaly) is caused by motion of the Local Sheet as a whole from the large Local Void towards the neighboring Leo cloud. Fig.2 presents the distribution of nearby galaxies in Supergalactic coordinates. The vector exten ...
Efficiently Extracting Energy from Cosmological
... More recently, there has been interest in the possibility of detecting cosmological neutrinos in beta-decay experiments such as KATRIN and MARE [19, 20]. In these cases the observational signature is a distortion in the energy spectra of the electrons emitted by unstable nuclei that arises because ...
... More recently, there has been interest in the possibility of detecting cosmological neutrinos in beta-decay experiments such as KATRIN and MARE [19, 20]. In these cases the observational signature is a distortion in the energy spectra of the electrons emitted by unstable nuclei that arises because ...
Backreaction and the Covariant Formalism of General Relativity
... modifying the gravity in order to allow acceleration means that we explain the observations with repulsive gravity. The use of the cosmological constant represents the simplest way to modify gravity, but there are other ways of doing it. Some examples are scalar-tensor models and brane-world models. ...
... modifying the gravity in order to allow acceleration means that we explain the observations with repulsive gravity. The use of the cosmological constant represents the simplest way to modify gravity, but there are other ways of doing it. Some examples are scalar-tensor models and brane-world models. ...
Transverse and Longitudinal Correlation Functions in the
... mass of the Sun, are surrounded by a disc of material. This may indicate that these objects form the same way as did our Sun. The new findings confirm that the same appears to be true for their even smaller cousins, sometimes called planetary-mass objects or ‘planemos’. These objects have masses sim ...
... mass of the Sun, are surrounded by a disc of material. This may indicate that these objects form the same way as did our Sun. The new findings confirm that the same appears to be true for their even smaller cousins, sometimes called planetary-mass objects or ‘planemos’. These objects have masses sim ...
Chapter 25 - Haiku Learning
... this vast universe? Do stars move, or do they remain in one place? Does the universe extend infinitely in all directions, or does it have boundaries? This chapter will answer these questions by examining the universe and the most numerous objects in the night sky—the stars. As early as 5000 years ago ...
... this vast universe? Do stars move, or do they remain in one place? Does the universe extend infinitely in all directions, or does it have boundaries? This chapter will answer these questions by examining the universe and the most numerous objects in the night sky—the stars. As early as 5000 years ago ...
Next Generation Sunshine State Standards Chapter 24
... measurements is called stellar parallax, a measurement that is limited to determining the distances to only the closest stars. Recall from Chapter 21 that stellar parallax is the very slight back-and-forth shift of the apparent position of a nearby star due to the orbital motion of Earth around the ...
... measurements is called stellar parallax, a measurement that is limited to determining the distances to only the closest stars. Recall from Chapter 21 that stellar parallax is the very slight back-and-forth shift of the apparent position of a nearby star due to the orbital motion of Earth around the ...
Introduction to Cosmology and String Theory
... for the total energy density ρ and the total momentum p. We read off that ä > 0 requires ρ + 3p < 0. This implies that the strong energy dominance condition, ρ + 3p > 0, must be violated during inflation. One example which violates this condition is a positive cosmological constant for which p W –ρ ...
... for the total energy density ρ and the total momentum p. We read off that ä > 0 requires ρ + 3p < 0. This implies that the strong energy dominance condition, ρ + 3p > 0, must be violated during inflation. One example which violates this condition is a positive cosmological constant for which p W –ρ ...
1 Origin of the Elements. Isotopes and Atomic Weights
... nuclei (p C n), then helium (2p C 2n). The process of element building had begun. During this small niche of cosmic history, from about 10 500 s after the big bang, the entire universe is thought to have behaved as a colossal homogeneous fusion reactor converting hydrogen into helium. Previously no ...
... nuclei (p C n), then helium (2p C 2n). The process of element building had begun. During this small niche of cosmic history, from about 10 500 s after the big bang, the entire universe is thought to have behaved as a colossal homogeneous fusion reactor converting hydrogen into helium. Previously no ...
Cosmic Order out of Primordial Chaos Jones, Bernard JT
... It is then asserted that if the moment of inertia and tidal shear tensors were uncorrelated, we would have only the first term on the right hand side, 13 δi j : the angular momentum vector would be isotropically distributed relative to the tidal tensor. In fact, in the primordial density field and t ...
... It is then asserted that if the moment of inertia and tidal shear tensors were uncorrelated, we would have only the first term on the right hand side, 13 δi j : the angular momentum vector would be isotropically distributed relative to the tidal tensor. In fact, in the primordial density field and t ...
Non-standard cosmology
A non-standard cosmology is any physical cosmological model of the universe that has been, or still is, proposed as an alternative to the Big Bang model of standard physical cosmology. In the history of cosmology, various scientists and researchers have disputed parts or all of the Big Bang due to a rejection or addition of fundamental assumptions needed to develop a theoretical model of the universe. From the 1940s to the 1960s, the astrophysical community was equally divided between supporters of the Big Bang theory and supporters of a rival steady state universe. It was not until advances in observational cosmology in the late 1960s that the Big Bang would eventually become the dominant theory, and today there are few active researchers who dispute it.The term non-standard is applied to any cosmological theory that does not conform to the scientific consensus, but is not used in describing alternative models where no consensus has been reached, and is also used to describe theories that accept a ""big bang"" occurred but differ as to the detailed physics of the origin and evolution of the universe. Because the term depends on the prevailing consensus, the meaning of the term changes over time. For example, hot dark matter would not have been considered non-standard in 1990, but would be in 2010. Conversely, a non-zero cosmological constant resulting in an accelerating universe would have been considered non-standard in 1990, but is part of the standard cosmology in 2010.