Primordial Black Holes - Recent Developments - SLAC
... on their formation and evaporation. PBHs could provide a unique probe of the early Universe, gravitational collapse, high energy physics and quantum gravity. Indeed their study may place interesting constraints on the physics relevant to these areas even if they never formed. In the “early Universe” ...
... on their formation and evaporation. PBHs could provide a unique probe of the early Universe, gravitational collapse, high energy physics and quantum gravity. Indeed their study may place interesting constraints on the physics relevant to these areas even if they never formed. In the “early Universe” ...
abstracts_2071
... Since the ancient Greeks, and likely before them, an ongoing debate has raged between rationalism and empiricism. At the risk of some oversimplification, the two camps split as follows: The rationalists, represented first by Plato and in the 17th century by Descartes, Spinoza, and Leibnitz, view the ...
... Since the ancient Greeks, and likely before them, an ongoing debate has raged between rationalism and empiricism. At the risk of some oversimplification, the two camps split as follows: The rationalists, represented first by Plato and in the 17th century by Descartes, Spinoza, and Leibnitz, view the ...
Direct comparison of experimental and theoretical results on the
... relative directions of the currents in the antenna loops, that is on the antenna spectrum. In this paper, experimental data obtained in conditions similar to those of previous experiments [16] are compared in detail with computations on the basis of the theoretical model reported in [8]. That model ...
... relative directions of the currents in the antenna loops, that is on the antenna spectrum. In this paper, experimental data obtained in conditions similar to those of previous experiments [16] are compared in detail with computations on the basis of the theoretical model reported in [8]. That model ...
Stellar Helium Burning in Other Universes: A
... partial derivatives are to be evaluated at the values realized within our universe. This expression represents the leading order correction and is limited to small changes in the binding energies. In this context, the total binding energy of 8 Be (or twice that of 4 He) is of order 56 MeV, whereas w ...
... partial derivatives are to be evaluated at the values realized within our universe. This expression represents the leading order correction and is limited to small changes in the binding energies. In this context, the total binding energy of 8 Be (or twice that of 4 He) is of order 56 MeV, whereas w ...
A New Assessment of Dark Matter in the Milky Way Galaxy
... Milky Way Galaxy, I produce a new estimate of the dark matter distribution, as well as the overall dark matter content, of our galaxy. Initially, I develop a model of the baryonic mass of the galaxy (i.e. luminous matter and interstellar clouds). This model incorporates three components: an exponent ...
... Milky Way Galaxy, I produce a new estimate of the dark matter distribution, as well as the overall dark matter content, of our galaxy. Initially, I develop a model of the baryonic mass of the galaxy (i.e. luminous matter and interstellar clouds). This model incorporates three components: an exponent ...
Quantum Theory Cannot Hurt You
... As a science writer I am constantly amazed by how much stranger science is than science fiction, how much more incredible the Universe is than anything we could possibly have invented. Despite this, however, very few of the extraordinary discoveries of the past century seem to have trickled through ...
... As a science writer I am constantly amazed by how much stranger science is than science fiction, how much more incredible the Universe is than anything we could possibly have invented. Despite this, however, very few of the extraordinary discoveries of the past century seem to have trickled through ...
The Universe at Your Fingertips • Astronomical Society of the Pacific
... mass equal to nearly 3 million suns. The cores of more massive and distant galaxies have 'supermassive' black holes containing the equivalent of 100 million to as much as 10 billion suns. Astronomers are not entirely sure how these supermassive black holes evolved so quickly to their present masses ...
... mass equal to nearly 3 million suns. The cores of more massive and distant galaxies have 'supermassive' black holes containing the equivalent of 100 million to as much as 10 billion suns. Astronomers are not entirely sure how these supermassive black holes evolved so quickly to their present masses ...
The local density of matter mapped by Hipparcos
... set of nearby stars. These data permit a reassessment of the amount of matter in the local Galactic disc because of two significant improvements. First, the kinematics and vertical density distribution of stars used to trace the disc potential can be determined with much higher accuracy, permitting ...
... set of nearby stars. These data permit a reassessment of the amount of matter in the local Galactic disc because of two significant improvements. First, the kinematics and vertical density distribution of stars used to trace the disc potential can be determined with much higher accuracy, permitting ...
Mathematics is the language of physics
... (iii) Solar day : It is the time taken by earth to complete one rotation about its axis with respect to sun. Since this time varies from day to day, average solar day is calculated by taking average of the duration of all the days in a year and this is called Average Solar day. ...
... (iii) Solar day : It is the time taken by earth to complete one rotation about its axis with respect to sun. Since this time varies from day to day, average solar day is calculated by taking average of the duration of all the days in a year and this is called Average Solar day. ...
A Map of the Universe
... is in the equatorial plane (δ = 0), (if δ 6= 0, structures (such as voids) will appear lengthened in the direction tangential to the line of sight by a factor of 1/ cos(δ)). This correction is important for study of the Alcock-Paczynski effect, which says that structures such as voids will not be sh ...
... is in the equatorial plane (δ = 0), (if δ 6= 0, structures (such as voids) will appear lengthened in the direction tangential to the line of sight by a factor of 1/ cos(δ)). This correction is important for study of the Alcock-Paczynski effect, which says that structures such as voids will not be sh ...
3. Cosmology and the Origin and Evolution of Galaxies
... 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 counterparts8. Radio interferometric data help refine the positions of the mm galaxies, which allows the optical and IR counterparts to be identified ...
... 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 counterparts8. Radio interferometric data help refine the positions of the mm galaxies, which allows the optical and IR counterparts to be identified ...
Particle Physics Matter, Energy, Space, Time
... energy as Universe stretches i.e, negative pressure • The cosmological constant L has the equation of state w=p/r=–1 • Generically called “Dark Energy” ...
... energy as Universe stretches i.e, negative pressure • The cosmological constant L has the equation of state w=p/r=–1 • Generically called “Dark Energy” ...
Cosmological Consequences of Topological Defects
... that any stable lattice of frustrated walls must obey and propose a class of models which, in the limit of large number N of coupled scalar fields, approaches the so-called ‘ideal’ model (in terms of its potential to lead to network frustration). By using the results of the largest and most accurate ...
... that any stable lattice of frustrated walls must obey and propose a class of models which, in the limit of large number N of coupled scalar fields, approaches the so-called ‘ideal’ model (in terms of its potential to lead to network frustration). By using the results of the largest and most accurate ...
Conductivity and the Current-Current Correlation Measure
... m(E1 , E2 ) for E1 6= E2 that we refer to as the off-diagonal case. This is important in view of the formula for the localization length (16), and in order to control the density in a neighborhood of the diagonal. Unfortunately, the approach developed in this note does not seem to allow us to contro ...
... m(E1 , E2 ) for E1 6= E2 that we refer to as the off-diagonal case. This is important in view of the formula for the localization length (16), and in order to control the density in a neighborhood of the diagonal. Unfortunately, the approach developed in this note does not seem to allow us to contro ...
gr-qc - UChicago High Energy Physics
... subject of research[2]. However, at the present time, it is not possible to realize a consistent quantum gravity theory which leads to the unification of gravitation with the other forces. One of the problems relies in the impossibility of constructing a gauge-invariant and nonperturbative formalism ...
... subject of research[2]. However, at the present time, it is not possible to realize a consistent quantum gravity theory which leads to the unification of gravitation with the other forces. One of the problems relies in the impossibility of constructing a gauge-invariant and nonperturbative formalism ...
cp violation and the origins of matter
... mass-energy associated with stars, galaxies, etc. The larger value comes from various measurements of large scale structure, especially measurements of the potential associated with gravitating (but not necessarily visible) mass-energy. The discrepancy between these numbers suggests that the majorit ...
... mass-energy associated with stars, galaxies, etc. The larger value comes from various measurements of large scale structure, especially measurements of the potential associated with gravitating (but not necessarily visible) mass-energy. The discrepancy between these numbers suggests that the majorit ...
Problems
... We will estimate the electrical field between an ionized donor atom and a negatively charged vacancy, and its effect upon diffusion. Assume a Si crystal at 1000 °C. The donor atom and vacancy will interact by Coulomb forces. We will calculate the corresponding electrical field for different separati ...
... We will estimate the electrical field between an ionized donor atom and a negatively charged vacancy, and its effect upon diffusion. Assume a Si crystal at 1000 °C. The donor atom and vacancy will interact by Coulomb forces. We will calculate the corresponding electrical field for different separati ...
Charge density research: from inorganic and molecular
... These maps represent the redistribution of electron density due to interatomic interactions using as reference state the Independent Atom Model (IAM). An example of the static deformation charge density of a nitronyl ring, consisting of two nitroxide NO . functions, in the free radical NitPy [15] is ...
... These maps represent the redistribution of electron density due to interatomic interactions using as reference state the Independent Atom Model (IAM). An example of the static deformation charge density of a nitronyl ring, consisting of two nitroxide NO . functions, in the free radical NitPy [15] is ...
The Physics of Collective Consciousness - Philsci
... fumble and shove, gradually moving the food toward the Hill, but as though by blind chance. It is only when you watch the dense mass of thousands of ants, crowded together around the Hill, blackening the ground, that you begin to see the whole beast, and now you observe it thinking., planning, calcu ...
... fumble and shove, gradually moving the food toward the Hill, but as though by blind chance. It is only when you watch the dense mass of thousands of ants, crowded together around the Hill, blackening the ground, that you begin to see the whole beast, and now you observe it thinking., planning, calcu ...
The Celestial Sphere CHAPTER 1
... motion was a good approximation. Furthermore, since a geocentric model maintains circular motion, it was very difficult to make any observational distinction between geocentric and heliocentric universes. (Parallax effects are far too small to be noticeable with the naked eye.) ...
... motion was a good approximation. Furthermore, since a geocentric model maintains circular motion, it was very difficult to make any observational distinction between geocentric and heliocentric universes. (Parallax effects are far too small to be noticeable with the naked eye.) ...
Thomson, Edward Andrew (2011) Schrodinger wave
... for the two codes is exactly the same hence a plot for timestep 0 (D = 1) has been omitted from this figure. . . . . . . . . . . . . . . . . . . . . . 103 ...
... for the two codes is exactly the same hence a plot for timestep 0 (D = 1) has been omitted from this figure. . . . . . . . . . . . . . . . . . . . . . 103 ...
Summary - X-ray Astronomy Group at ISAS
... I will not give specific numbers (e.g. energy resolution, spatial resolution, sensitivity) this has been well covered in the talks on specific missions I personally believe that we have the technology to make major steps forward As Suzaku has shown even ‘small’ improvements can have major science im ...
... I will not give specific numbers (e.g. energy resolution, spatial resolution, sensitivity) this has been well covered in the talks on specific missions I personally believe that we have the technology to make major steps forward As Suzaku has shown even ‘small’ improvements can have major science im ...
Effects of plasma non-homogeneity on the physical properties of
... hot and cold electron temperatures and the respective densities are shown in Fig. 4. The electron densities increase towards the center of the discharge Ž xs 0 mm., with more than an exponential increase for the hot electron density. The ratios n crn h and TcrT h range from 500 to 10 and from 20 to ...
... hot and cold electron temperatures and the respective densities are shown in Fig. 4. The electron densities increase towards the center of the discharge Ž xs 0 mm., with more than an exponential increase for the hot electron density. The ratios n crn h and TcrT h range from 500 to 10 and from 20 to ...
Generation of scale invariant magnetic fields in
... to the construction of various mechanisms for the generation of magnetic fields in the early universe. A lot of effort in this direction has focused on the production of magnetic fields during the inflationary phase [25–39]. It has long been known that the conformal invariance of the electromagnetic ...
... to the construction of various mechanisms for the generation of magnetic fields in the early universe. A lot of effort in this direction has focused on the production of magnetic fields during the inflationary phase [25–39]. It has long been known that the conformal invariance of the electromagnetic ...
TOWARDS AN UNDERSTANDING OF DARK MATTER: PRECISE
... areas of the sky. This is a bit of a paradox, as such distant regions of the universe should never have been in physical contact with one another; thus there is no reason for them to appear similar. The widely accepted resolution of this paradox comes from inflation theory (Guth 1981), which explain ...
... areas of the sky. This is a bit of a paradox, as such distant regions of the universe should never have been in physical contact with one another; thus there is no reason for them to appear similar. The widely accepted resolution of this paradox comes from inflation theory (Guth 1981), which explain ...
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.