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Cosmological constant problem - Wikipedi

In cosmology, the cosmological constant problem or vacuum catastrophe is the disagreement between the observed values of vacuum energy density (the small value of the cosmological constant) and theoretical large value of zero-point energy suggested by quantum field theory.. Depending on the Planck energy cutoff and other factors, the discrepancy is as high as 120 orders of magnitude, a state. In cosmology, the cosmological constant (usually denoted by the Greek capital letter lambda: Λ) is the value of the energy density of the vacuum of space. It was originally introduced by Albert Einstein in 1917 as an addition to his theory of general relativity to hold back gravity and achieve a static universe, which was the accepted view at the time. Einstein abandoned the concept after.

Il modello cosmologico standard ΛCDM - Parte I: cos'è e

Cosmological constant — Wikipedia Republished // WIKI

History. The cosmological constant first appeared in a 1917 paper by Einstein entitled Cosmological Considerations in the General Theory of Relativity (Einstein 1917), in which he motivates its introduction into the field theory of general relativity by the need to stabilize the universe against the attractive effect of gravity: The term is necessary only for the purpose of making possible. Cosmology (from the Greek κόσμος, kosmos world and -λογία, -logia study of) is a branch of astronomy concerned with the studies of the origin and evolution of the universe, from the Big Bang to today and on into the future.It is the scientific study of the origin, evolution, and eventual fate of the universe. Physical cosmology is the scientific study of the universe's origin.

Hubble's law, also known as the Hubble-Lemaître law, is the observation in physical cosmology that galaxies are moving away from the Earth at speeds proportional to their distance. In other words, the farther they are the faster they are moving away from Earth. The velocity of the galaxies has been determined by their redshift, a shift of the light they emit to the red end of the spectrum For example, the cosmological constant may be a fundamental constant, but attempts have also been made to calculate it from other constants, and according to the author of one such calculation, the small value of the cosmological constant is telling us that a remarkably precise and totally unexpected relation exists among all the parameters of the Standard Model of particle physics, the bare.

Cosmological constant - Memory Alpha, the Star Trek Wiki

cosmological constant (plural cosmological constants) A term added by Albert Einstein to his equations of general relativity in order to account for a supposed static universe, since used to describe vacuum energy as a form of dark energy. Usage notes The cosmological constant is one of the contributors to the energy density of the universe. In any universe that it is in, a cosmological constant will retain the same energy density regardless of the expansion of the universe. It can be considered to be a field of constant energy density spanning all of space. It is the simplest type of dark energy

Wikis. Explore Wikis; Community Central; Start a Wiki; Open Science Wiki. Search. Sign In; Don't have an account? Register; Start a Wiki. Open Science Wiki. 198 Pages. Add new page. Wikia Content. Most visited articles. Vital Force Theory; Cosmological Constant. The cosmological constant (usually denoted by the Greek capital letter lambda: Λ) is a value occurring in Einstein's theory of general relativity.The units of Λ are 1/second 2.The constant is proportional to the energy density of the vacuum ρ: . where π is pi, G is the gravitational constant and c is the speed of light in vacuum.The term can be positive, negative, or zero and can be.

Cosmological constant (英語) - スカラーペディア百科事典「宇宙定数」の項目。 参考文献. 佐藤勝彦 アインシュタインの宇宙 最新宇宙学と謎の「宇宙項」(角川学芸出版 2009年 Die kosmologische Konstante (gewöhnlich abgekürzt durch das große griechische Lambda) ist eine physikalische Konstante in Albert Einsteins Gleichungen der allgemeinen Relativitätstheorie, welche die Gravitationskraft als geometrische Krümmung der Raumzeit beschreibt. In SI-Einheiten hat die Dimension 1/L 2 (Einheit: m −2).Ihr Wert kann a priori positiv, negativ oder null sein

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Equation. The cosmological constant Λ appears in Einstein's modified field equation in the form. where R and g pertain to the structure of spacetime, T pertains to matter and energy (thought of as affecting that structure), and G and c are conversion factors which arise from using traditional units of measurement. When Λ is zero, this reduces to the original field equation of general relativity A cosmological constant term added to the standard model Big Bang theory leads to a model that appears to be consistent with the observed large-scale distribution of galaxies and clusters, with WMAP's measurements of cosmic microwave background fluctuations, and with the observed properties of X-ray clusters The cosmological constant will also cause a precession of the perihelion of a planet. Cardona and Tejeiro (1998, ApJ, 493, 52) claimed that this effect could set limits on the vacuum density only ten or so times higher than the critical density, but their calculation appears to be off by a factor of 3 trillion In cosmology, the cosmological constant (usually denoted by the Greek capital letter lambda: Λ) is the value of the energy density of the vacuum of space.It was originally introduced by Albert Einstein in 1917 as an addition to his theory of general relativity to hold back gravity and achieve a static universe, which was the accepted view at the time This page is based on the copyrighted Wikipedia article Cosmological_constant_problem ; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License. You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA. Cookie-policy; To contact us: mail to admin@qwerty.wiki

The cosmological constant problem encompassing the weakly or non-gravitating vacuum energy, the late-time accelerated cosmic expansion, and the coincident current energy densities of the cosmological constant and matter remains a difficult puzzle to cosmology The cosmological constant' of Einstein's general relativity equations is linearly related to the zero-point mass density. Einstein originally posited a nonzero value for the cosmological constant, but after the expansion of the universe was discovered, he lamented that this was his greatest blunder and set the constant to zero [ Davies2007 , pg. 58] This page is based on the copyrighted Wikipedia article Cosmological_constant ; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License. You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA. Cookie-policy; To contact us: mail to admin@qwerty.wiki En relatividad general, la constante cosmológica (denotada usualmente por Lambda, ) es una constante propuesta por Albert Einstein en 1917 [1] como una modificación de su ecuación original del campo gravitatorio para conseguir una solución que diera un universo estático. Einstein rechazó esta idea en 1931 una vez que el corrimiento al rojo de las galaxias observado por Edwin Hubble. Physical cosmology Universe · Big Ban

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Cosmological constant - Religions Wiki

  1. Cosmological constant, term reluctantly added by Albert Einstein to his equations of general relativity in order to obtain a solution to the equations that described a static universe, as he believed it to be at the time.The constant has the effect of a repulsive force that acts against the gravitational attraction of matter in the universe. When Einstein heard of the evidence that the.
  2. La constante cosmologique est un paramètre ajouté par Einstein en février 1917 à ses équations de la relativité générale (1915), dans le but de rendre sa théorie compatible avec l'idée qu'il avait alors d'un Univers statique.. La constante cosmologique est notée [1], [2].Elle a la dimension d'une courbure de l'espace, en m −2.Depuis les années 1990, les développements de la.
  3. Definition. Let be a manifold equipped with an Einstein metric.Then the cosmological constant of is defined as the constant of proportionality for which: . where denotes the Ricci curvature tensor.. Equivalently the cosmological constant for an Einstein metric can be defined as the Ricci curvature associated with any one-dimensional subspace of the tangent space
  4. plural of cosmological constant Definition from Wiktionary, the free dictionar

But Einstein's cosmological constant is back and now in play again (Sawyer 33, Reiss 18). The 1998 Report. The team who uncovered the accelerating expansion studied Type Ia supernova and gathered values of high redshift (far away) versus low redshift (close by) in order to get a good value for the cosmological constant, or Λ COSMOLOGICAL CONSTANT - THE WEIGHT OF THE VACUUM T. Padmanabhan IUCAA, Pune University Campus, Ganeshkhind, Pune 411 007, India. email: nabhan@iucaa.ernet.in Abstract Recent cosmological observations suggest the existence of a positive cosmological constant Λ with the magnitude Λ(G~/c3) ≈ 10−123 The Cosmological Constant Lambda, a concept introduced by Einstein in 1917, has been with us ever since in different variants and incarnations, including the broader concept of Dark Energy. Current observations are consistent with a value of Lambda corresponding to about present-epoch 70% of the critical density of the Universe. This is causing the speeding up (acceleration) of the expansion. Finstrukturkonstanten är en dimensionslös storhet (betecknas α) som enligt moderna tolkningar anger den elektromagnetiska kraftens styrka. Eftersom denna kopplingskonstant alfa är mycket mindre än ett, är kvantelektrodynamik en relativt enkel kvantfältteori för denna fundamentala naturkraft.Men talet introducerades redan 1916 av Sommerfeld som ett hastighetsförhållande för att. cosmological horizon of radius r [3]. A cosmological horizon is the largest observable distance scale, and the presence of matter will only decrease the horizon radius [4,5]. But we observe scales that are large in Planck units (r˛1). Since r must be even larger, Eq. (1.2) implies that the cosmological constant is small

Cosmological constant - Encyclopedia of Mathematic

Value of the Cosmological Constant: Theory versus Experiment Moshe Carmeli and Tanya Kuzmenko Department of Physics, Ben Gurion University, Beer Sheva 84105, Israel Abstract. The numerical value of the cosmological constant is calculated using a recently suggested cosmological model and found to be = 2:036 10 −35s 2 The cosmological constant. You may have heard that the Universe's expansion is accelerating due to dark energy, and this requires yet one more parameter -- a cosmological constant -- to describe. The cosmological constant is usually assumed to be, well, a constant. If it isn't, it can be more generally referred to as 'dark energy. Because the cosmological constant is, by definition, constant throughout time and space, it's natural to associate it with the energy of the vacuum. Unfortunately, if one calculates the vacuum energy density from quantum zero-point fluctuations (i.e., when particles pop in and out of existence), the result is a factor of 10 120 higher than the value deduced from astronomical observations The cosmological constant problem is examined in the context of both astronomy and physics. Effects of a nonzero cosmological constant are discussed with reference to expansion dynamics, the age of the universe, distance measures, comoving density of objects, growth of linear perturbations, and gravitational lens probabilities. The observational status of the cosmological constant is reviewed.

The current acceleration of the universe can be modeled in terms of a cosmological constant. We show that the extremely small value of ΛL_P^2 ~ 3.4 x 10^{-122}, the holy grail of theoretical physics, can be understood in terms of a new, dimensionless, conserved number CosMIn (N), which counts the number of modes crossing the Hubble radius during the three phases of evolution of the universe. The cosmological constant is the simplest possible form of dark energy since it is constant in both space and time, and this leads to the current standard model of cosmology known as the Lambda. Unfortunately, knowing that the cosmological constant is the best mathematical explanation for how dark energy is stretching out our universe doesn't help much in understanding why it exists at all If the cosmological constant were e.g. 100 times the measured value (which is still a tiny value compared to the Planck density) everything would have be blown apart long before these structures would have had time to form [/caption] The cosmological constant, symbol Λ (Greek capital lambda), was 'invented' by Einstein, not long after he published his theory of general relativity (GR). It appears on the left.

This is a review of the physics and cosmology of the cosmological constant. Focusing on recent developments, I present a pedagogical overview of cosmology in the presence of a cosmological constant, observational constraints on its magnitude, and the physics of a small (and potentially nonzero) vacuum energy He called this idea, which was represented as an additional term in the mathematical equation representing his theory of gravity, the cosmological constant. In other words, Einstein supposed the universe to be static and unchanging, because that is the way it looked to astronomers in 1917 The cosmological argument is an attempt to prove the existence of God by the fact that things exist. It assumes that things must have a cause, and that the chain of causes can only end by a supernatural event. Other names for the argument are argument from universal causation, argument from first cause, causal argument and argument from existence

cosmological-constant. Ask Question Tag Info Usage guidance, also known as a tag wiki excerpt, is a short blurb that describes when and why a tag should be used on this site specifically. There is no tag wiki for this tag yet! Tag wikis help introduce newcomers to the tag Retrieved from https://www.preposterousuniverse.com/quantumspacetime/index.php?title=Cosmological_constant&oldid=5 Cosmological constant definition is - a constant term used in the relativistic equations for gravity to represent a repulsive force which may account in part for the rate of expansion of the universe This area of the site is for articles regarding the subject of the wiki. Add your own subcategories to this area, and endeavour to categorise all content somewhere under here. To add an article, image, or category to this category, append [[Category:Content]] to the end of its page

Cosmological constant - Scholarpedi

  1. The Cosmological Constant. Carroll SM(1). Author information: (1)Theoretical Physics and Astrophysics Physics Department, California Institute of Technology, 452-48 1200, E. California Blvd., Pasadena, CA 91125 USA ; Enrico Fermi Institute and Department of Physics, University of Chicago, 5640, S. Ellis Ave., Chicago, IL 60637 USA
  2. The cosmological constant problem Steven Weinberg Theory Group, Department ofPhysics, University of Texas, Austin, Texas 7871Z Astronomical observations indicate that the cosmological constant is many orders of magnitude smaller than estimated in modern theories of elementary particles. After a brief review of the history of this prob- lem, five different approaches to its solution are described
  3. cosmological (not comparable) Of or pertaining to cosmology, or to the overall structure of the universe; Derived terms . Derived terms. cosmological argument; cosmological city; cosmological constant; cosmological decade; cosmological horizon; cosmological natural selection; cosmological perturbation theory; cosmological principle.
  4. cosmological constant (koz-mŏ-loj -ă-kăl) A constant term that can be added to Einstein's field equations of general relativity theory.The cosmological constant was originally put forward by Albert Einstein in 1917 to ensure that the application of general relativity theory to the Universe results in a static Universe rather than an expanding or contracting Universe
  5. What is the cosmological constant? Ed Copeland and Mike Merrifield. More videos at http://www.sixtysymbols.com
  6. the cosmological constant as constituting a serious problem for modern physics. 2. The 'quantum' history of Λ The cosmological constant has been in and out of Einstein's equations (1) ever since Einstein introduced it in 1917 in order to counterbalance gravitation and thus secure a static universe [45, 35, 49]
  7. The cosmological parameter results explore a variety of cosmological models with combinations of Planck and other data. We provide results from MCMC exploration chains, as well as best fits, and sets of parameter tables. Definitions, conventions and reference are contained in Planck-2013-XVI. Production proces

The Cosmological Constant Problem (CCP) is widely considered a crisis in contemporary theoretical physics. Unfortunately, the search for its resolution is hampered by open disagreement about what is, strictly, the problem. This disagreement stems from the observation that the CCP is not a problem within any of our current theories, and nearly all of the details of those future theories. A non-zero value for the cosmological constant could be implied from measurements of the volume densities of distant galaxies, but such measurements give a negative result, showing an upper bound of. This implies that on the scale of the whole universe, vacuum fluctuation effects cancel out Get MagellanTV here: https://try.magellantv.com/arvinash and get an exclusive offer for our viewers: an extended, month-long trial, FREE. MagellanTV has the.

Video: Cosmology - Wikipedi

general relativity - Gravitationally bound systems andCOSMOS : THE FABRIC OF COSMOS : ( Part 1 of 4 )Cosmological Theories Through History - The Physics of the

The cosmological constant is not diluted as the universe expands, whereas the density of matter drops in inverse proportion to the volume. This means that there is only a fleeting moment of cosmological time during which the matter density will be of comparable magnitude to the vacuum energy density Cosmological Constant is on Facebook. Join Facebook to connect with Cosmological Constant and others you may know. Facebook gives people the power to share and makes the world more open and connected cosmological constant översättning i ordboken engelska - svenska vid Glosbe, online-lexikon, gratis. Bläddra milions ord och fraser på alla språk Define cosmological constant. cosmological constant synonyms, cosmological constant pronunciation, cosmological constant translation, English dictionary definition of cosmological constant. n. A constant introduced into the general theory of relativity,.

Gravitational waves have been directly detected and astronomical observations indicate that our Universe has a positive cosmological constant $\mathrm{\ensuremath{\Lambda}}$. Nevertheless, a theoretical gauge-invariant notion of gravitational waves arriving at infinity (escaping from the space-time) in the presence of a positive $\mathrm{\ensuremath{\Lambda}}$ has been elusive The cosmological constant (, or also indicated by λ) is the value of the energy density of the vacuum of space. It was originally introduced by Albert Einstein in 1917 as an addition to his theory of general relativity to achieve a static universe.The cosmological constant is the simplest possible form of dark energy, since it is constant in both space and time

Hubble's law - Wikipedi

Cosmological Constant. The cosmological constant, conventionally denoted by the Greek letter , is a parameter describing the energy density of the vacuum (empty space), and a potentially important contributor to the dynamical history of the universe.Unlike ordinary matter, which can clump together or disperse as it evolves, the energy density in a cosmological constant is a property of. cosmological constant (koz-mŏ-loj -ă-kăl) A constant term that can be added to Einstein's field equations of general relativity theory.The cosmological constant was originally put forward by Albert Einstein in 1917 to ensure that the application of general relativity theory to the Universe results in a static Universe rather than an expanding or contracting Universe The Cosmological Constant. Annual Review of Astronomy and Astrophysics Vol. 30:499-542 (Volume publication date Annual Review of Astronomy and Astrophysics The Hubble Constant Wendy L. Freedman and Barry F. Madore Annual Review of Astronomy and Astrophysics Type Ia Supernovae as Standard Candle Most people chose this as the best definition of cosmological-constant: A constant introduced int... See the dictionary meaning, pronunciation, and sentence examples Cosmology was the study of the cosmos—the structure, organization and composition of all that existed. What most people would call the known universe was labeled the Prime Material Plane.It held the world of Toril, the moon, the sun, and extended out into space to the stars. How far out into space was a question of cosmology, and the answer might depend on which cosmological model was used.

Fine-tuned universe - Wikipedi

  1. cosmological constant Jos eP.S.Lemos Department of Physics, Columbia University, New York, NY 10027, & Centro Multidisciplinar de Astrof sica - CENTRA, Departamento de F sica, Instituto Superior T ecnico, Av. Rovisco Pais 1, 1049-001 Lisbon e-mail: lemos@physics.columbia.edu Francisco S. N. Lob
  2. Bharat Vishnu Ratra (* 26.Januar 1960 in Mumbai) ist ein indisch-US-amerikanischer Astrophysiker und Kosmologe.. Ratra studierte Physik am Indian Institute of Technology mit dem Bachelor-Abschluss 1982 und wurde 1986 bei Michael Peskin und Leonard Susskind an der Stanford University promoviert. Als Post-Doktorand war er am Stanford Linear Accelerator Center, an der Princeton University, dem.
  3. However, the cosmological constant theory isn't ideal, either. The expected value of the constant, based on known physics, is a number more than 10 to the power of 60.
  4. A new perspective on the Cosmological Constant Problem (CCP) is proposed and discussed within the multiverse approach of Quantum Cosmology. It is assumed that each member of the ensemble of universes has a characteristic scale a that can be used as integration variable in the partition function. An averaged characteristic scale of the ensemble is estimated by using only members that satisfy.
  5. THE fundamental constants of physics, such as c the velocity of light, h Planck's constant, e the charge and m mass of the electron, and so on, provide for us a set of absolute units for measurement of distance, time, mass, etc. There are, however, more of these constants than are necessary for this purpose, with the result that certain dimensionless numbers can be constructed from them

cosmological constant - Wiktionar

cosmological constant: A constant introduced into the general theory of relativity, proportional to the energy density of the vacuum, and related to the rate of expansion or contraction of the universe. The vacuum energy represented by the cosmological constant is a form of dark energy (PhysOrg.com) -- Some scientists call the cosmological constant the worst prediction of physics. And when today's theories give an estimated value that is about 120 orders of magnitude larger. cosmological constant, observational constraints on its magnitude, and the physics of a small (and potentially nonzero) vacuum energy. NB: The author will not update this review anymore, however, some of its topics are subject of other reviews What is cosmological constant? Asked by Wiki User. Be the first to answer! 1 2 3. Answer. Who doesn't love being #1? Be the first to answer this question. Register to get answer. Related Questions

2. WHY A COSMOLOGICAL CONSTANT SEEMS INEVITABLE. In this section we discuss the form that the vacuum energy-momentum tensor must take, and why the predicted value of vac is unreasonably high (Weinberg 1989; for nontechnical introductions see Abbott 1988 and Freedman 1990). To a particle physicist, the word ``vacuum'' has a different meaning than to an astronomer The ability to manipulate cosmological forces. Sub-power ofUniversal Manipulation and Universal Force Manipulation. Variation of Force Manipulation 1 Also Called 2 Capabilities 3 Applications 4 Associations 5 Known Users 6 Known Objects 7 Gallery Cosmic Dynamism Cosmic Force Manipulation User can create, shape and manipulate cosmological forces, powers that form the universe, including spatial. Definition of cosmological constant in the Definitions.net dictionary. Meaning of cosmological constant. What does cosmological constant mean? Information and translations of cosmological constant in the most comprehensive dictionary definitions resource on the web Define cosmological constants. cosmological constants synonyms, cosmological constants pronunciation, cosmological constants translation, English dictionary definition of cosmological constants. n. A constant introduced into the general theory of relativity, proportional to the energy density of the vacuum, and related to the rate of expansion or.. Cosmological Constant & The End of the Universe - Sixty Symbols - Duration: 14:17. Sixty Symbols 279,745 views. 14:17. Synchronicity and The Number 137 - Duration: 7:43

Cosmological constant Verse and Dimensions Wikia Fando

cosmological constant. cosmological constant: translation. noun. A term added by to his equations of general relativity in order to account for a supposed static universe. Wikipedia foundation. laky COSMOLOGICAL CONSTANT 501 siderations should severely limit our expectations for current observational information concerning f~A. Table 1 lists five fiducial cosmological models, parametrized by f~M and ~A, which we will refer to in following sections as Models A through E The Cosmological Constant Problem 1. The numerical value of the cosmological constant The cosmological constant Λ was introduced by Albert Einstein into general relativity in 1917. Including the cosmological constant, Einstein's field equations are Rµν − 1 2 gµνR +ΛGµν = − 8πG c4 Tµν. (1 cosmological constant. cosmological constant: translation. Astron. a term introduced by Einstein into his field equations of general relativity to permit a stationary, nonexpanding universe: it has since been abandoned in most models of the universe cosmological constant. cosmological constant: translation. noun. an arbitrary constant in the equations of general relativity theor

cosmology - Is the universe flat? - Physics Stack ExchangeJ

cosmological constants Newton's inversive square law Ashtekar's variables Författare . Ola Boström. Institutionen för teoretisk fysik . Forskning Andra publikationer. Ämneskategorier. Fysik. ISBN. 991-324063. What will the universe do if a cosmological constant is positive? Asked by Wiki User. 3 4 5. Answer. Top Answer. Wiki User Answered . 2010-10-17 00:42:23 2010-10-17 00:42:23 The gravitational constant denoted by letter G, is an empirical physical constant involved in the calculation(s) of gravitational force between two bodies. It appearslaw of universal gravitation, and in Albert Einstein's theory of general relativity. It is also known as the universal gravitational constant, Newton's constant, and colloquially as Big G. It should not be confused with little g. Einstein's cosmological constant synonyms, Einstein's cosmological constant pronunciation, Einstein's cosmological constant translation, English dictionary definition of Einstein's cosmological constant. n. A constant introduced into the general theory of relativity, proportional to. The next video is starting stop. Loading... Watch Queu

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