Articoli di riviste: "Expansion of universe"

1

Wetterich, C. "Universe without expansion". Physics of the Dark Universe 2, n. 4 (dicembre 2013): 184–87. http://dx.doi.org/10.1016/j.dark.2013.10.002.

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2

Steer, Ian. "Who discovered Universe expansion?" Nature 490, n. 7419 (ottobre 2012): 176. http://dx.doi.org/10.1038/490176c.

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3

Ne'eman, Yuval. "Inflationary Cosmogony, Copernican Relevelling and Extended Reality". Symposium - International Astronomical Union 168 (1996): 559–62. http://dx.doi.org/10.1017/s0074180900110691.

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“Eternal” Inflation has relevelled the creation of universes, making it a “routine” physical occurence. The mechanism of the Big Bang, from the conditions triggering it, to the eventual creation of the entire matter content of the resulting universe, involves no singular physical processes. However, causal horizons, due to General Relativity, separate the newborn universe from the parent universe in which it was seeded as a localized vacuum energy. The new universe's expansion only occurs “after” infinite time, i.e. “never”, in the parents frame. This forces a reassessment of “reality”. The two universes are connected by the world line of the initial localized vacuum energy, originating in the parent universe. Assuming that the parent universe itself was generated in a similar fashion, etc., an infinite sequence of previous universes is thus connected by one world-line, like a string of beads.

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4

Gimsa, Dr Andreas. "The Expansion of the Universe". International Journal of Scientific Research and Management 8, n. 07 (18 luglio 2020): 25–31. http://dx.doi.org/10.18535/ijsrm/v8i07.aa01.

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The expansion of the universe is explained, calculated and graphically displayed. The 3K background radiation is examined and interpreted as reflected and distributed stellar radiation. The role of entropy in cosmology is discussed. In our expanding universe it must remain constant. Physical quantities previously assumed to be constant are worked out to be variable. It is explained why the measured redshift is not due to an accelerated growth of the universe.

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Morikawa, Masahiro. "Universe with oscillating expansion rate". Astrophysical Journal 369 (marzo 1991): 20. http://dx.doi.org/10.1086/169734.

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6

von Brzeski, Georg, e Vadim von Brzeski. "Misconceptions of Universe Expansion, Accelerated Universe Expansion, and Their Sources. Virtual Reality of Inflationary Cosmology". Journal of Modern Physics 09, n. 06 (2018): 1326–59. http://dx.doi.org/10.4236/jmp.2018.96081.

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7

Phillips, David, Priscilla Heard e Christopher W. Tyler. "Expanding Universe Illusion". i-Perception 10, n. 3 (maggio 2019): 204166951985384. http://dx.doi.org/10.1177/2041669519853848.

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We present a new induced movement illusion from global expansion or contraction in a triangular region filled with rising or falling textures. Objective global expansion or contraction induces lateral movement in the oblique edges of the triangle. The effects may be due to common and relative movements operating within a single texture.

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Bhoja Poojary, Bhushan. "Rotating Space Fabric of Universe Responsible for Expansion of Universe". American Journal of Astronomy and Astrophysics 4, n. 4 (2016): 38. http://dx.doi.org/10.11648/j.ajaa.20160404.11.

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9

Page, Don N. "No superluminal expansion of the universe". Classical and Quantum Gravity 26, n. 12 (27 maggio 2009): 127001. http://dx.doi.org/10.1088/0264-9381/26/12/127001.

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10

Freedman, Wendy. "The expansion rate of the universe". Astronomy and Geophysics 43, n. 1 (febbraio 2002): 1.10–1.13. http://dx.doi.org/10.1046/j.1468-4004.2002.43110.x.

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11

Qing Jong, Lee. "The Relative Expansion of the Universe". American Journal of Astronomy and Astrophysics 3, n. 3 (2015): 37. http://dx.doi.org/10.11648/j.ajaa.20150303.11.

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12

Tamm, Martin. "Accelerating Expansion in a Closed Universe". Journal of Modern Physics 06, n. 03 (2015): 239–51. http://dx.doi.org/10.4236/jmp.2015.63029.

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13

Updike, John. "The Accelerating Expansion of the Universe". Physics Today 58, n. 4 (aprile 2005): 39. http://dx.doi.org/10.1063/1.1955477.

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14

Klimenko, A. V., V. A. Klimenko e A. M. Fridman. "The uniform expansion of the Universe". Astronomy Reports 54, n. 10 (ottobre 2010): 871–89. http://dx.doi.org/10.1134/s106377291010001x.

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15

Dolja, Valerian V., e Mart Krupovic. "Accelerating expansion of the viral universe". Current Opinion in Virology 3, n. 5 (ottobre 2013): 542–45. http://dx.doi.org/10.1016/j.coviro.2013.08.002.

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16

Hsu, Jong-Ping, Leonardo Hsu e Daniel Katz. "Big Jets model with CPT invariance and dynamics of expansion with quantum Yang–Mills gravity". Modern Physics Letters A 33, n. 20 (28 giugno 2018): 1850116. http://dx.doi.org/10.1142/s021773231850116x.

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Based on particle physics, the fundamental CPT invariance suggests a Big Jets model for the beginning of the universe, in which two oppositely directed jets evolved into a gigantic “matter half-universe” and a gigantic “antimatter half-universe” after annihilation and decay processes. In the geometric-optics limit, quantum Yang–Mills gravity with [Formula: see text] translational gauge symmetry in flat spacetime leads to an effective metric tensor in the Hamilton–Jacobi equation for macroscopic objects. This effective metric tensor does not exist in the wave equations of quantum particles. For cosmological expansion, we assume that an “effective metric tensor” for spacetime geometry based on Yang–Mills gravity corresponds to the usual FLRW form. Dynamical equations of expansion for the matter half-universe are obtained and solved. The time-dependent scale factors and the estimated age of the universes, [Formula: see text] yr, based on Yang–Mills gravity are consistent with experiments. CPT invariance implies that the same evolution process and dynamics of cosmic expansion also hold for the distant “antimatter half-universe”.

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17

Pan, Haipeng, e Dongbin Jin. "Design and Application of Variable Universe Fuzzy Controller Based on Cat Swarm Optimization". Mathematical Problems in Engineering 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/4632064.

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A novel variable universe fuzzy controller based on cat swarm optimization (CSO-VUFC) is proposed to regulate the temperature of the reactor system, which is characterized by nonlinearity, large time delay, and uncertainty. In CSO-VUFC, firstly, corresponding contraction-expansion factors with the function form were, respectively, introduced for the input and output fuzzy universes of the controller. Then, cat swarm optimization was used to optimize the relevant parameter values in the contraction-expansion factor function to achieve the intelligence optimization of the contraction-expansion factors, based on the system performance test function as an evaluation index; the contradiction between the universe adjustment and control accuracy of the fuzzy controller will be effectively solved to achieve the online self-adjustment of the universe. The simulation results indicate that the variable universe adaptive fuzzy control method based on the cat swarm optimization has the features of high precision adjustment, short transient time, and hard real-time.

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18

CARMELI, MOSHE. "FUNDAMENTAL APPROACH TO THE COSMOLOGICAL CONSTANT ISSUE". International Journal of Modern Physics A 17, n. 29 (20 novembre 2002): 4219–28. http://dx.doi.org/10.1142/s0217751x02013253.

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We use a Riemannian four-dimensional presentation for gravitation in which the coordinates are distances and velocity rather than the traditional space and time. We solve the field equations and show that there are three possibilities for the Universe to expand. The theory describes the Universe as having a three-phase evolution with a decelerating expansion, followed by a constant and an accelerating expansion, and it predicts that the Universe is now in the latter phase. It is shown, assuming Ωm = 0.245, that the time at which the Universe goes over from a decelerating to an accelerating expansion, occurs at 8.5 Gyr ago, at which time the cosmic radiation temperature was 146K. Recent observations show that the Universe's growth is accelerating. Our theory confirms these recent experimental results. The theory predicts also that now there is a positive pressure in the Universe. Although the theory has no cosmological constant, we extract from it its equivalence and show that Λ = 1.934 × 10-35 s-2. This value of Λ is in excellent agreement with measurements. It is also shown that the three-dimensional space of the Universe is Euclidean, as the Boomerang experiment shows.

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19

Masreliez, C. Johan. "Does Cosmological Scale Expansion Explain the Universe?" Physics Essays 19, n. 1 (1 marzo 2006): 91–122. http://dx.doi.org/10.4006/1.3025787.

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20

Kumar, Umesh. "Fiction Supporting Decelerated Expansion of the Universe". IOSR Journal of Applied Physics 2, n. 1 (2012): 41–42. http://dx.doi.org/10.9790/4861-0214142.

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21

Sorg, M. "Spin precession and expansion of the Universe". Il Nuovo Cimento B Series 11 109, n. 5 (maggio 1994): 465–78. http://dx.doi.org/10.1007/bf02728387.

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22

der Burgt, Maarten J. Van. "Accelerated Expansion of a Matter-Antimatter Universe". International Journal of Applied Physics 8, n. 1 (25 febbraio 2021): 5–13. http://dx.doi.org/10.14445/23500301/ijap-v8i1p102.

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23

Fahr, Hans J., e Michael Heyl. "A universe with a constant expansion rate". Physics & Astronomy International Journal 4, n. 4 (12 agosto 2020): 156–63. http://dx.doi.org/10.15406/paij.2020.04.00215.

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24

Christodoulou, Dimitris M., e Demosthenes Kazanas. "Universal expansion with spatially varying G". Monthly Notices of the Royal Astronomical Society: Letters 487, n. 1 (23 maggio 2019): L53—L57. http://dx.doi.org/10.1093/mnrasl/slz074.

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ABSTRACT We calculate the expansion of the Universe under the assumptions that G varies in space and the radial size r of the Universe is very large (we call this the MOND regime of varying-G gravity). The inferred asymptotic behaviour turns out to be different from that found by McCrea & Milne in 1934 and our equations bear no resemblance to those of the relativistic case. In this cosmology, the scale factor R(t) increases linearly with time t, the radial velocity is driven by inertia, and gravity is incapable of hindering the expansion. Yet, Hubble’s law is borne out without any additional assumptions. When we include a repulsive acceleration ade due to dark energy, the resulting universal expansion is then driven totally by this new term and the solutions for ade → 0 do not reduce to those of the ade ≡ 0 case. This is a realization of a new Thom catastrophe: The inclusion of the new term alters the conservation of energy and the dark energy solutions are not reducible to those in the case without dark energy.

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25

Marosi, Laszlo A. "The Photon-Baryon Governed Universe". Physics Research International 2012 (25 febbraio 2012): 1–5. http://dx.doi.org/10.1155/2012/640605.

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In a previous paper we postulated that the repulsive force responsible for the universal expansion is associated with the excitation of the empty space (quantum vacuum) and the excitation energy is represented by the energy of the cosmic microwave background (CMB). In this paper, we show that the concept of the repulsive space expanding photon field (i) can successfully be applied to explain the local velocity anomaly of the Milky Way Galaxy as shown by Faber and Burstein (1998) and Tully (1998), (ii) offers a convincing explanation of the still disputed question of the cosmological expansion on local and intergalactic scales discussed by Cooperstock et al. (1998), and (iii) explains the redshift (RS) of the CMB in accordance with the law of energy conservation without the need for dark matter (DM) and dark energy (DE). Probably the most remarkable result of this model (abbreviated as photon/baryon: PB model in the following discussion) is that the individual voids building up the soup-bubble- (SB-) like galaxy distribution are the governing dynamical components of the universal expansion. Further consequence implies that the universe is considerably older than the interpretation of the Hubble constant as expansion velocity suggests.

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26

Samanta, G. C., e R. Myrzakulov. "Cosmological models constructed by van der Waals fluid approximation and volumetric expansion". International Journal of Geometric Methods in Modern Physics 14, n. 12 (24 novembre 2017): 1750183. http://dx.doi.org/10.1142/s0219887817501833.

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The universe modeled with van der Waals fluid approximation, where the van der Waals fluid equation of state contains a single parameter [Formula: see text]. Analytical solutions to the Einstein’s field equations are obtained by assuming the mean scale factor of the metric follows volumetric exponential and power-law expansions. The model describes a rapid expansion where the acceleration grows in an exponential way and the van der Waals fluid behaves like an inflation for an initial epoch of the universe. Also, the model describes that when time goes away the acceleration is positive, but it decreases to zero and the van der Waals fluid approximation behaves like a present accelerated phase of the universe. Finally, it is observed that the model contains a type-III future singularity for volumetric power-law expansion.

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27

Singh, Kangujam Priyokumar, e Mahbubur Rahman Mollah. "Could the Lyra manifold be the hidden source of the dark energy?" International Journal of Geometric Methods in Modern Physics 14, n. 04 (8 marzo 2017): 1750063. http://dx.doi.org/10.1142/s0219887817500633.

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In the course of investigation of our present universe by considering the five-dimensional locally rotationally symmetric (LRS) Bianchi type-I universe with time-dependent deceleration parameters in Lyra manifold, it is excitingly found that the geometry itself of Lyra manifold behaves and consistent with present observational findings for accelerating universe. The behavior of the universes and their contribution to the process of evolution are examined. While studying their physical, dynamical and kinematical properties for different cases, it is found that this model is a new and viable form of model universe containing dark energy. It will be very helpful in explaining the present accelerated expansion behavior of the universe.

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28

Grøn, Øyvind. "The Discovery of the Expansion of the Universe". Galaxies 6, n. 4 (3 dicembre 2018): 132. http://dx.doi.org/10.3390/galaxies6040132.

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Alexander Friedmann, Carl Wilhelm Wirtz, Vesto Slipher, Knut E. Lundmark, Willem de Sitter, Georges H. Lemaître, and Edwin Hubble all contributed to the discovery of the expansion of the universe. If only two persons are to be ranked as the most important ones for the general acceptance of the expansion of the universe, the historical evidence points at Lemaître and Hubble, and the proper answer to the question, “Who discovered the expansion of the universe?”, is Georges H. Lemaître.

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29

Tsupko, Oleg Yu, e Gennady S. Bisnovatyi-Kogan. "First analytical calculation of black hole shadow in McVittie metric". International Journal of Modern Physics D 29, n. 09 (luglio 2020): 2050062. http://dx.doi.org/10.1142/s0218271820500625.

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Cosmic expansion influences the angular size of black hole shadow. The most general way to describe a black hole embedded into an expanding universe is to use the McVittie metric. So far, the exact analytical solution for the shadow size in the McVittie metric, valid for arbitrary law of expansion and arbitrary position of the observer, has not been found. In this paper, we present the first analytical solution for angular size of black hole shadow in McVittie metric as seen by observer comoving with the cosmic expansion. We use a method of matched asymptotic expansions to find approximate solution valid within the entire range of possible positions of observer. As two particular examples, we consider black hole in de Sitter and matter-dominated universe.

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30

Chan, Man Ho. "The Energy Conservation in Our Universe and the Pressureless Dark Energy". Journal of Gravity 2015 (15 luglio 2015): 1–4. http://dx.doi.org/10.1155/2015/384673.

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Recent observations confirm that a certain amount of unknown dark energy exists in our universe so that the current expansion of our universe is accelerating. It is commonly believed that the pressure of the dark energy is negative and the density of the dark energy is almost a constant throughout the universe expansion. In this paper, we show that the law of energy conservation in our universe has to be modified because more vacuum energy is gained due to the universe expansion. As a result, the pressure of dark energy would be zero if the total energy of our universe is increasing. This pressureless dark energy model basically agrees with the current observational results.

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31

Fay, Stéphane. "ΛCDM periodic cosmology". Monthly Notices of the Royal Astronomical Society 494, n. 2 (8 aprile 2020): 2183–90. http://dx.doi.org/10.1093/mnras/staa940.

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ABSTRACT We examine the possibility that Universe expansion be made of some Λ-cold dark matter (ΛCDM) expansions repeating periodically, separated by some inflation- and radiation-dominated phases. This so-called ΛCDM periodic cosmology is motivated by the possibility that inflation and the present phase of accelerated expansion be due to the same dark energy. Then, in a phase space showing the variation of matter density parameter Ωm with respect to this of the radiation Ωr, the curve Ωm(Ωr) looks like a closed trajectory that Universe could run through forever. In this case, the end of the expansion acceleration of the ΛCDM phase is the beginning of a new inflation phase. We show that such a scenario implies the coupling of matter and/or radiation to dark energy. We consider the simplest of these ΛCDM periodic models i.e. a vacuum energy coupled to radiation. From matter domination phase to today, it behaves like a ΛCDM model, then followed by an inflation phase. But a sudden and fast decay of the dark energy into radiation periodically ends the expansion acceleration. This leads to a radiation-dominated Universe preceding a new ΛCDM type expansion. The model is constrained with Markov Chain Monte Carlo simulations using supernovae, Hubble expansion, Baryon Acoustic Oscillations (BAO), and cosmic microwave background data and fits the data as well as the ΛCDM one.

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32

Faraoni, V. "Possible fates for the accelerating Universe". Canadian Journal of Physics 84, n. 6-7 (15 gennaio 2006): 583–89. http://dx.doi.org/10.1139/p06-025.

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The accelerating Universe may end in eternal de Sitter expansion, in a Big Rip, or in super-exponential expansion. We discuss a gauge-independent stability analysis of de Sitter space in scalartensor and in modified gravity, the late-time dynamics of a phantom Universe with general potential, and the recent proposal of evading the Big Rip through wormhole tunneling.PACS Nos.: 98.80.k, 04.50.+h, 04.20.q

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33

Ward, Jessie Davis. "A Study of Systemology and Astronomic Atomic Structures". JOURNAL OF ADVANCES IN PHYSICS 13, n. 1 (28 febbraio 2017): 4507–21. http://dx.doi.org/10.24297/jap.v13i1.5583.

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34

Hova, Hoavo. "Vacuum expansion in arbitrary–gauge Lyra geometry". Canadian Journal of Physics 92, n. 4 (aprile 2014): 311–15. http://dx.doi.org/10.1139/cjp-2012-0279.

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We propose a cosmological model containing a cosmological term in arbitrary gauge in Lyra’s geometry. In the absence of matter fields (such as radiation or baryonic), a constant cosmological term does not lead to the de Sitter universe as it is seen in Riemannian geometry, while a time-varying cosmological term can drive the universe into an accelerated expansion.

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35

Vigoureux, B., J. M. Vigoureux e P. Vigoureux. "Connectingcto the Expansion of the Universe: Cosmological Consequences". Physics Essays 14, n. 4 (dicembre 2001): 314–19. http://dx.doi.org/10.4006/1.3025499.

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36

Liu, Zhi-Guo, e Yun-Song Piao. "A Galileon design of slow expansion: Emergent universe". Physics Letters B 718, n. 3 (gennaio 2013): 734–39. http://dx.doi.org/10.1016/j.physletb.2012.11.068.

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37

Beltrán Almeida, J. P., e J. G. Pereira. "Holographic dark energy and the universe expansion acceleration". Physics Letters B 636, n. 2 (maggio 2006): 75–79. http://dx.doi.org/10.1016/j.physletb.2006.02.069.

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38

Bonasera, Aldo. "On the Expansion and Fate of the Universe". Journal of Modern Physics 03, n. 11 (2012): 1722–26. http://dx.doi.org/10.4236/jmp.2012.311212.

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39

Balakin, Alexander B. "Curvature Coupling and Accelerated Expansion of the Universe". General Relativity and Gravitation 36, n. 7 (luglio 2004): 1513–25. http://dx.doi.org/10.1023/b:gerg.0000032144.79593.51.

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40

Cohen, M. H., P. D. Barthel, T. J. Pearson e J. A. Zensus. "Expanding Quasars and the Expansion of the Universe". Symposium - International Astronomical Union 129 (1988): 23–24. http://dx.doi.org/10.1017/s0074180900133820.

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The μ–z diagram (Figure 1) plots the observed internal proper motion μ versus redshift z for 32 extragalactic radio sources associated with active galactic nuclei. The observed points fall below an upper bound which decreases with redshift; there is a statistically significant anticorrelation between redshift and internal proper motion.

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41

Bonnor, W. B. "Local Dynamics and the Expansion of the Universe". General Relativity and Gravitation 32, n. 6 (giugno 2000): 1005–7. http://dx.doi.org/10.1023/a:1001961325184.

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42

Freedman, Wendy L. "The Expansion Rate and Size of the Universe". Scientific American 267, n. 5 (novembre 1992): 54–60. http://dx.doi.org/10.1038/scientificamerican1192-54.

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43

Alnes, Håvard, Morad Amarzguioui e Øyvind Grøn. "Can a dust dominated universe have accelerated expansion?" Journal of Cosmology and Astroparticle Physics 2007, n. 01 (10 gennaio 2007): 007. http://dx.doi.org/10.1088/1475-7516/2007/01/007.

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44

Nagao, Shigeto. "Light speed and the expansion of the universe". Journal of Physics: Conference Series 306 (8 luglio 2011): 012073. http://dx.doi.org/10.1088/1742-6596/306/1/012073.

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45

Sato, H. "Blast Wave Shell Expansion in Flat Universe Model". Progress of Theoretical Physics 90, n. 4 (1 settembre 1993): 841–50. http://dx.doi.org/10.1143/ptp/90.4.841.

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46

Dil, Emre. "Space Creation Mechanism during the Expansion of Universe". Advances in Astronomy 2016 (2016): 1–5. http://dx.doi.org/10.1155/2016/4695065.

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We propose a novel mechanism related to the expansion of universe. Recently Verlinde’s proposal has been applied to the deformed bosons being a candidate for the dark energy constituents, since the negative pressure of the deformed bosons. The expansion of universe is dependent on the dark energy and implies a creation of space; we admit that the space creation mechanism is related to the deformed bosons and so is the dark energy. In order to relate the dark energy and the mechanism for creation of space, we consider Verlinde’s proposal including the Holographic principle for emergence of space, which was recently applied to the deformed bosons. To check the validity of our mechanism, we calculate the ratio of the size of universe before and after the expansion and compare the results with the observational data. We find that the results are consistent with each other and infer that the proposed mechanism works correctly.

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47

Pruzhinskaya, M. V., E. S. Gorbovskoy e V. M. Lipunov. "“Pure” supernovae and accelerated expansion of the Universe". Astronomy Letters 37, n. 10 (ottobre 2011): 663–69. http://dx.doi.org/10.1134/s1063773711090076.

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48

Nambu, Yasusada, e Atsushi Taruya. "Application of gradient expansion to an inflationary universe". Classical and Quantum Gravity 13, n. 4 (1 aprile 1996): 705–13. http://dx.doi.org/10.1088/0264-9381/13/4/010.

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49

Astier, Pierre. "The expansion of the universe observed with supernovae". Reports on Progress in Physics 75, n. 11 (16 ottobre 2012): 116901. http://dx.doi.org/10.1088/0034-4885/75/11/116901.

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50

Cohen, Marshall H., Peter D. Barthel, Timothy J. Pearson e J. Anton Zensus. "Expanding quasars and the expansion of the universe". Astrophysical Journal 329 (giugno 1988): 1. http://dx.doi.org/10.1086/166352.

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Articoli di riviste sul tema "Expansion of universe"

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