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Journal articles on the topic 'Friedmann'

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Published: 4 June 2021
Last updated: 5 February 2022

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1

Morowitz, Harold J. "Pieta.George Klein , Theodore Friedmann , Ingrid Friedmann." Quarterly Review of Biology 68, no. 4 (December 1993): 568–69. http://dx.doi.org/10.1086/418312.

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2

Ballantyne, J. "Imrich Friedmann." BMJ 325, no. 7364 (September 14, 2002): 601. http://dx.doi.org/10.1136/bmj.325.7364.601.

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3

McKay, Chris. "Imre Friedmann." Astrobiology 7, no. 5 (October 2007): iii. http://dx.doi.org/10.1089/ast.2007.0611.

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4

Schulz, Hartmut. "Friedmann models." Nature 376, no. 6536 (July 1995): 112. http://dx.doi.org/10.1038/376112c0.

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5

Oren, Aharon. "E. Imre Friedmann 1921-2007." Algological Studies 130 (October 1, 2009): 13–16. http://dx.doi.org/10.1127/1864-1318/2009/0130-0013.

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6

Beenakker, Carlo. "Online Friedmann resource." Physics Today 66, no. 3 (March 2013): 9. http://dx.doi.org/10.1063/pt.3.1899.

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7

Csomós, György. "John Friedmann (1926–2017)." Tér és Társadalom 31, no. 3 (August 23, 2017): 187–90. http://dx.doi.org/10.17649/tet.31.3.2905.

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8

Rothstein, Stephen I., Ralph W. Schreiber, and Thomas R. Howell. "In Memoriam: Herbert Friedmann." Auk 105, no. 2 (April 1988): 365–68. http://dx.doi.org/10.2307/4087502.

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9

Simon, David. "John Friedmann, 1926–2017." International Development Planning Review 39, no. 3 (June 2017): v—vii. http://dx.doi.org/10.3828/idpr.2017.14.

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10

Gergely, László Á., and Zoltán Keresztes. "Irradiated asymmetric Friedmann branes." Journal of Cosmology and Astroparticle Physics 2006, no. 01 (January 24, 2006): 022. http://dx.doi.org/10.1088/1475-7516/2006/01/022.

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11

Arnold, Wolfgang. "Imrich Friedmann (1907–2002)." Journal of Laryngology & Otology 116, no. 12 (December 2002): 1057. http://dx.doi.org/10.1258/002221502761698865.

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12

Ambjørn, J., and Y. Watabiki. "A modified Friedmann equation." Modern Physics Letters A 32, no. 40 (December 28, 2017): 1750224. http://dx.doi.org/10.1142/s0217732317502248.

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We recently formulated a model of the universe based on an underlying W3-symmetry. It allows the creation of the universe from nothing and the creation of baby universes and wormholes for spacetimes of dimension 2, 3, 4, 6 and 10. Here we show that the classical large time and large space limit of these universes is one of exponential fast expansion without the need of a cosmological constant. Under a number of simplifying assumptions, our model predicts that w = −1.2 in the case of four-dimensional spacetime. The possibility of obtaining a w-value less than −1 is linked to the ability of our model to create baby universes and wormholes.
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13

Chiquito, Elisângela De Almeida. "Entrevista com John Friedmann." Risco: Revista de Pesquisa em Arquitetura e Urbanismo (Online) 14, no. 2 (December 23, 2016): 82. http://dx.doi.org/10.11606/issn.1984-4506.v14i2p82-89.

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14

Kunzmann, Klaus R. "Memories of John Friedmann." Planning Theory & Practice 19, no. 1 (January 2018): 13–17. http://dx.doi.org/10.1080/14649357.2018.1413752.

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15

Campbell, Heather, Andy Inch, and Crystal Legacy. "Tribute to John Friedmann." Planning Theory & Practice 19, no. 1 (January 2018): 9. http://dx.doi.org/10.1080/14649357.2018.1416965.

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16

Siong, Ch'ng Han, and Shahidan Radiman. "The modified Friedmann equations." Advanced Studies in Theoretical Physics 9 (2015): 121–38. http://dx.doi.org/10.12988/astp.2015.412158.

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17

Neusner, Jacob. "Response to Daniel Friedmann." Review of Rabbinic Judaism 7, no. 1-2 (2004): 187–88. http://dx.doi.org/10.1163/1570070041960857.

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18

Teuber, J., and P. G. Hjorth. "Inertia in Friedmann cosmologies." Il Nuovo Cimento B 97, no. 2 (February 1987): 131–40. http://dx.doi.org/10.1007/bf02888816.

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19

Cai, Rong-Gen, and Sang Pyo Kim. "First Law of Thermodynamics and Friedmann Equations of Friedmann–Robertson–Walker Universe." Journal of High Energy Physics 2005, no. 02 (February 16, 2005): 050. http://dx.doi.org/10.1088/1126-6708/2005/02/050.

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20

Nemiroff, Robert J., and Bijunath Patla. "Adventures in Friedmann cosmology: A detailed expansion of the cosmological Friedmann equations." American Journal of Physics 76, no. 3 (March 2008): 265–76. http://dx.doi.org/10.1119/1.2830536.

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21

Moradpour, H., Rafael C. Nunes, Everton M. C. Abreu, and Jorge Ananias Neto. "A note on the relations between thermodynamics, energy definitions and Friedmann equations." Modern Physics Letters A 32, no. 13 (April 25, 2017): 1750078. http://dx.doi.org/10.1142/s021773231750078x.

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We investigate the relation between the Friedmann and thermodynamic pressure equations, through solving the Friedmann and thermodynamic pressure equations simultaneously. Our investigation shows that a perfect fluid, as a suitable solution for the Friedmann equations leading to the standard modeling of the universe expansion history, cannot simultaneously satisfy the thermodynamic pressure equation and those of Friedmann. Moreover, we consider various energy definitions, such as the Komar mass, and solve the Friedmann and thermodynamic pressure equations simultaneously to get some models for dark energy fluids. The cosmological consequences of obtained solutions are also addressed. Our results indicate that some of obtained solutions may unify the dominated fluid in both the primary inflationary and current accelerating eras into one model. In addition, by taking into account a cosmic fluid of a known equation of state (EoS), and combining it with the Friedmann and thermodynamic pressure equations, we obtain the corresponding energy of these cosmic fluids and face their limitations. Finally, we point out the cosmological features of this cosmic fluid and also study its observational constraints.
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22

Ch’ng, Han Siong, Geri Gopir, and Shahidan Radiman. "The spatially flat Friedmann equation for early rainbow universe." Modern Physics Letters A 30, no. 31 (September 14, 2015): 1550165. http://dx.doi.org/10.1142/s0217732315501655.

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We derive the spatially flat rainbow-Friedmann equation from de Broglie–Bohm interpretation in canonical quantum cosmology. Our result shows that the spatially flat rainbow-Friedmann equations of early and late-time universe are having different forms. The spatially flat rainbow-Friedmann equation of early universe which is obtained in this paper is quite different from the one which was initially derived by Magueijo and Smolin [Class. Quantum Grav. 21, 1725 (2004)]. However, the spatially flat rainbow-Friedmann equation for late-time universe obtained in this paper is found to be the same as the one derived by Magueijo and Smolin (for the case [Formula: see text] and Newton’s gravitational constant [Formula: see text]. The new spatially flat rainbow-Friedmann equation obtained in this paper could provide an alternative way in understanding the evolution of the early rainbow universe.
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23

Friedmann, Michael L. "Errata to Maegaard and Friedmann." Journal of Music Theory 30, no. 1 (1986): 168. http://dx.doi.org/10.2307/843418.

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24

Southwell-Lee, Meiling. "China's Urban Transition. John Friedmann." China Journal 55 (January 2006): 156–57. http://dx.doi.org/10.2307/20066133.

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25

da Silva, P. Michel L. T., A. de Souza Dutra, and J. M. Hoff da Silva. "Friedmann–Lemaître–Robertson–Walker braneworlds." Physics Letters B 774 (November 2017): 482–88. http://dx.doi.org/10.1016/j.physletb.2017.06.072.

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26

Lemos, Nivaldo A. "Radiation‐dominated quantum Friedmann models." Journal of Mathematical Physics 37, no. 3 (March 1996): 1449–60. http://dx.doi.org/10.1063/1.531443.

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27

Ferrando, Joan Josep, Juan Antonio Morales, and Miquel Portilla. "Potential perturbation to Friedmann universes." Physical Review D 50, no. 4 (August 15, 1994): 2567–71. http://dx.doi.org/10.1103/physrevd.50.2567.

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28

Bayin, S. S. "Symmetry changes in Friedmann cosmologies." Astrophysical Journal 301 (February 1986): 517. http://dx.doi.org/10.1086/163920.

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29

Kurianovich, E. A. "Exact solutions of Friedmann equation." Journal of Mathematical Physics 57, no. 12 (December 2016): 122503. http://dx.doi.org/10.1063/1.4972836.

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30

Hinterleitner, F. "A quantized closed Friedmann model." Classical and Quantum Gravity 18, no. 4 (February 6, 2001): 739–51. http://dx.doi.org/10.1088/0264-9381/18/4/312.

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31

Chan, R., J. P. S. Lemos, N. O. Santos, and J. A. de F. Pacheco. "Friedmann-like collapsing radiating sphere." Astrophysical Journal 342 (July 1989): 976. http://dx.doi.org/10.1086/167654.

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32

Child Hill, Richard, and June Woo Kim. "Reply to Friedmann and Sassen." Urban Studies 38, no. 13 (December 2001): 2541–42. http://dx.doi.org/10.1080/00420980120094669.

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33

Calzetta, E., and C. El Hasi. "Chaotic Friedmann-Robertson-Walker cosmology." Classical and Quantum Gravity 10, no. 9 (September 1, 1993): 1825–41. http://dx.doi.org/10.1088/0264-9381/10/9/022.

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34

Mallett, Ronald L. "Dirac quantization of Friedmann cosmologies." Classical and Quantum Gravity 12, no. 1 (January 1, 1995): L1—L4. http://dx.doi.org/10.1088/0264-9381/12/1/001.

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35

Pavon, D., J. Bafaluy, and David Jou. "Causal Friedmann-Robertson-Walker cosmology." Classical and Quantum Gravity 8, no. 2 (February 1, 1991): 347–60. http://dx.doi.org/10.1088/0264-9381/8/2/014.

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36

Karpov, O. B. "The coincidence of friedmann integrals." Astronomy Letters 29, no. 6 (June 2003): 361–62. http://dx.doi.org/10.1134/1.1579781.

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37

Johri, V. B., and R. Sudharsan. "Friedmann universes with bulk viscosity." Physics Letters A 132, no. 6-7 (October 1988): 316–20. http://dx.doi.org/10.1016/0375-9601(88)90860-2.

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38

Kibaroğlu, Salih, and Mustafa Senay. "Friedmann equations for deformed entropic gravity." International Journal of Modern Physics D 29, no. 06 (April 2020): 2050042. http://dx.doi.org/10.1142/s021827182050042x.

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In this study, we investigate the effects of the one- and two-parameters deformed systems on the Friedmann equations of the Friedmann–Robertson–Walker (FRW) universe by using the entropic gravity approach in the framework of the early universe era. We give simplified forms for the deformed Unruh temperature and Einstein field equations for three different deformed systems. Based on these compact equations, we derive the Friedmann equations with the effective gravitational and cosmological terms.
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39

Rosen, Ilana. "Friedmann, Robbie. 2014. 28 Letters – the Short Life of Renée (Baba) Friedmann on Not So Calm Waters. San Francisco, London: Blurb.com. An English, Hungarian and Hebrew Edition. 440 pp." Hungarian Cultural Studies 9 (October 11, 2016): 300–303. http://dx.doi.org/10.5195/ahea.2016.239.

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40

Michelman, Frank I. "Israel’s “Constitutional Revolution”: A Thought from Political Liberalism." Theoretical Inquiries in Law 19, no. 2 (August 14, 2018): 745–65. http://dx.doi.org/10.1515/til-2018-0034.

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Abstract In his book The Purse and the Sword: The Trials of Israel’s Legal Revolution, Daniel Friedmann brings under critical inspection what he names as a legal revolution in Israel. Friedmann gives us, under that name, an account of a shift of certain major and sensitive state powers from elected leaders and legislators to politically insulated officials and judges. The Supreme Court’s construction of two Basic Law enactments of the twelfth Knesset into a justiciable, substantive “formal constitution” for Israel figures in Friedmann’s book as one component of the revolution, along with other judicial developments, including purposive interpretation of constitutional and other laws, an intensified form of common-law review of administrative actions for unreasonableness, and expansionary revisions to standing and justiciability. In all these developments, Aharon Barak took a leading part as judge and as scholar. I here consider to what extent these developments may be understood as responsive to promptings from a “political-liberal” conception of a justificational burden and need for substantive constitutional law. I reflect here on the possible pull of this conception in a political-cultural setting of a persisting widespread attachment to an idea of Israel as a member of the family of liberal constitutional states, and hence on Barak’s understanding of the role and responsibility of the Supreme Court. I speculate briefly about how far that pull may extend also to Professor Friedmann in his role of critic of the judicial handiwork of Barak and the Court on which he served.
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41

Smith, Robert W. "Book Review: Friedmann as Hero: Alexander A. Friedmann: The Man Who Made the Universe Expand." Journal for the History of Astronomy 25, no. 2 (May 1994): 145–47. http://dx.doi.org/10.1177/002182869402500208.

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42

Faraoni, Valerio. "A Symmetry of the Einstein–Friedmann Equations for Spatially Flat, Perfect Fluid, Universes." Symmetry 12, no. 1 (January 10, 2020): 147. http://dx.doi.org/10.3390/sym12010147.

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We report a symmetry property of the Einstein–Friedmann equations for spatially flat Friedmann–Lemaître–Robertson–Walker universes filled with a perfect fluid with any constant equation of state. The symmetry transformations form a one-parameter Abelian group.
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43

WANG, BIN, ELCIO ABDALLA, and RU-KENG SU. "FRIEDMANN EQUATION AND CARDY FORMULA CORRESPONDENCE IN BRANE UNIVERSES." Modern Physics Letters A 17, no. 01 (January 10, 2002): 23–29. http://dx.doi.org/10.1142/s0217732302006114.

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We study the brane with arbitrary tension σ on the edge of various black holes with AdS asymptotics. We investigate Friedmann equations governing the motion of the brane universes and match the Friedmann equation to Cardy entropy formula.
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44

Zhang, Wei, and Xiao-Mei Kuang. "The Quantum Effect on Friedmann Equation in FRW Universe." Advances in High Energy Physics 2018 (2018): 1–5. http://dx.doi.org/10.1155/2018/6758078.

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We study the modified Friedmann equation in the Friedmann-Robertson-Walker universe with quantum effect. Our modified results mainly stem from the new entropy-area relation and the novel idea of Padmanabhan, who considers the cosmic space to be emerging as the cosmic time progresses, so that the expansion rate of the universe is determined by the difference of degrees of freedom between the holographic surface and the bulk inside. We also discuss the possibility of having bounce cosmological solution from the modified Friedmann equation in spatially flat geometry.
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45

Bagdonas, Alexandre, João Zanetic, and Ivã Gurgel. "O maior erro de Einstein? Debatendo o papel dos erros na ciência através de um jogo didático sobre cosmologia." Caderno Brasileiro de Ensino de Física 35, no. 1 (April 25, 2018): 97–117. http://dx.doi.org/10.5007/2175-7941.2018v35n1p97.

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A constante cosmológica de Einstein, introduzida por ele como uma estratégia para manter seu modelo de universo estático, tem sido divulgada como um dos maiores erros de sua carreira. Em 1922, Einstein avaliou o artigo enviado por Friedmann para um periódico alemão, mostrando que existe uma solução das equações de campo da relatividade geral em que o tamanho do universo aumenta com o tempo. Einstein considerou que Friedmann teria cometido um erro nos cálculos, mas após discutir a questão com um colega de Friedmann, reconheceu seu engano, declarando que a proposta do universo em expansão seria matematicamente possível. Contudo, acreditava que essa ideia dificilmente teria algum sentido físico. Este episódio histórico foi adaptado para o contexto do ensino de Física do ensino médio através da criação de um jogo didático. Neste artigo, analisamos argumentos envolvendo a oposição entre Einstein e Friedmann e as concepções dos alunos sobre o papel dos erros na ciência. Houve um equilíbrio entre o número de alunos que apoiou Einstein ou Friedmann. Muitos dos fãs de Einstein tinham uma admiração ingênua, acreditando que alguém tão inteligente como ele não poderia cometer erros. Por outro lado, os fãs de Friedmann valorizaram sua atitude crítica, desafiando a autoridade de um cientista renomado. Os alunos discutiram se o fato de que Einstein tenha admitido seu próprio erro deveria ou não ser valorizado. Com isso, notamos argumentos interessantes dos alunos sobre o papel dos erros na ciência, que motivaram a problematização do mito dos grandes gênios que nunca erram e cuja autoridade não deve ser questionada.
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46

Bormotova, I. M., and E. M. Kopteva. "Friedmann Cosmological Models with Various Equations of State of Matter." Ukrainian Journal of Physics 61, no. 9 (September 2016): 843–49. http://dx.doi.org/10.15407/ujpe61.09.0843.

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47

Wang Can-Can. "Quantum entanglement and cosmological Friedmann equations." Acta Physica Sinica 67, no. 17 (2018): 179501. http://dx.doi.org/10.7498/aps.67.20180813.

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48

Corbea-Hoisie, Andrei. "Offener Brief. Zu dem KapitelIsrael Friedmann." Études Germaniques 275, no. 3 (2014): 471. http://dx.doi.org/10.3917/eger.275.0471.

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49

Mijajlović, Ž., N. Pejović, S. Šegan, and G. Damljanović. "On asymptotic solutions of Friedmann equations." Applied Mathematics and Computation 219, no. 3 (October 2012): 1273–86. http://dx.doi.org/10.1016/j.amc.2012.07.035.

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50

Sheykhi, Ahmad. "Modified Friedmann equations from Tsallis entropy." Physics Letters B 785 (October 2018): 118–26. http://dx.doi.org/10.1016/j.physletb.2018.08.036.

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