Nonfiction 6

Download Cosmological Constant [lg artticle] by S. Carroll PDF

Posted On March 3, 2017 at 11:46 pm by / Comments Off on Download Cosmological Constant [lg artticle] by S. Carroll PDF

By S. Carroll

Show description

Read Online or Download Cosmological Constant [lg artticle] PDF

Best nonfiction_6 books

Logic, Meaning, and Conversation: Semantical Underdeterminacy, Implicature, and Their Interface

This clean examine the philosophy of language makes a speciality of the interface among a idea of literal that means and pragmatics--a philosophical exam of the connection among which means and language use and its contexts. right here, Atlas develops the distinction among verbal ambiguity and verbal generality, works out an in depth idea of conversational inference utilizing the paintings of Paul Grice on Implicature as a kick off point, and provides an account in their interface as an instance of the connection among Chomsky's Internalist Semantics and Language functionality.

Extra resources for Cosmological Constant [lg artticle]

Sample text

Since a universe with ΩΛ0 /ΩM0 ∼ 1 will have many more galaxies than one with ΩΛ0 /ΩM0 ∼ 100, it is quite conceivable that most observers will measure something close to the former value. The probability measure for observing a value of ρΛ can be decomposed as dP(ρΛ ) = ν(ρΛ )P∗(ρΛ )dρΛ , (61) where P∗ (ρΛ )dρΛ is the a priori probability measure (whatever that might mean) for ρΛ , and ν(ρΛ ) is the average number of galaxies which form at the specified value of ρΛ . Martel, Shapiro and Weinberg [185] have presented a calculation of ν(ρΛ ) using a spherical-collapse model.

Lett. B254, 347 (1991). [32] L. Kofman, N. Gnedin and N. Bahcall, Astrophys. J. 413, 1 (1993). [33] L. M. Krauss and M. S. Turner, Gen. Rel. Grav. 27, 1137 (1995) [astro-ph/9504003]. [34] J. P. Ostriker and P. J. Steinhardt, Nature 377, 600 (1995). [35] M. S. Turner, “The case for Lambda-CDM,” astro-ph/9703161. [36] D. A. Tammann, Ann. Rev. Astron. Astophys. 30, 359 (1992). A. Tammann, in Astrophysical Uses of the Space Telescope, ed. D. Machetto, F. Pacini, M. Tarenghi, p. 329 (Geneva: ESO, 1979).

7). 04, so the majority of the matter content must be in an unknown non-baryonic form. Nobody would have guessed that we live in such a universe. Figure (11) is a plot of ΩΛ as a function of the scale factor a for this cosmology. At early times, the cosmological constant would have been negligible, while at later times the density of matter will be essentially zero and the universe will be empty. We happen to live in that brief era, cosmologically speaking, when both matter and vacuum are of comparable magnitude.

Download PDF sample

Rated 4.56 of 5 – based on 18 votes