P. J. E. Peebles
- Published in print:
- 2020
- Published Online:
- January 2021
- ISBN:
- 9780691196022
- eISBN:
- 9780691201665
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691196022.003.0005
- Subject:
- Physics, Particle Physics / Astrophysics / Cosmology
This chapter explores how the very evident departures from Albert Einstein's homogeneity—stars in galaxies in groups and clusters of galaxies—might have formed in an expanding universe. In the ...
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This chapter explores how the very evident departures from Albert Einstein's homogeneity—stars in galaxies in groups and clusters of galaxies—might have formed in an expanding universe. In the established cosmology, cosmic structure formed by the gravitational instability of the relativistic expanding universe. The early confusion about the physical meaning of this instability is an important part of the history. The chapter reviews these considerations, along with assessments of early scenarios of how cosmic structure might have formed. A theory of how the galaxies formed in the big bang cosmology has to provide a physically consistent picture of how cosmic structure evolved from the very different conditions in the early stages of expansion. That consideration is absent in the 1948 steady-state cosmology, so thinking about structure formation had to be different.Less
This chapter explores how the very evident departures from Albert Einstein's homogeneity—stars in galaxies in groups and clusters of galaxies—might have formed in an expanding universe. In the established cosmology, cosmic structure formed by the gravitational instability of the relativistic expanding universe. The early confusion about the physical meaning of this instability is an important part of the history. The chapter reviews these considerations, along with assessments of early scenarios of how cosmic structure might have formed. A theory of how the galaxies formed in the big bang cosmology has to provide a physically consistent picture of how cosmic structure evolved from the very different conditions in the early stages of expansion. That consideration is absent in the 1948 steady-state cosmology, so thinking about structure formation had to be different.
Penelope J. Corfield
- Published in print:
- 2007
- Published Online:
- October 2013
- ISBN:
- 9780300115581
- eISBN:
- 9780300137941
- Item type:
- chapter
- Publisher:
- Yale University Press
- DOI:
- 10.12987/yale/9780300115581.003.0003
- Subject:
- History, History of Ideas
This chapter analyzes micro-change, one of the central dimensions of history. It explains that micro-change can be defined as evolution or gradualism and that a significant element of regular, ...
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This chapter analyzes micro-change, one of the central dimensions of history. It explains that micro-change can be defined as evolution or gradualism and that a significant element of regular, gradual micro-change is everywhere detectable in the steady progression of measured time. It also suggests that gradual change is integral to the temporal process and is linked to all cosmic energy structures. This chapter also contends that micro-change shows its insidious power at macro-level in the visible cosmos and can be analyzed at micro-level in the invisible quantum state of subatomic particles.Less
This chapter analyzes micro-change, one of the central dimensions of history. It explains that micro-change can be defined as evolution or gradualism and that a significant element of regular, gradual micro-change is everywhere detectable in the steady progression of measured time. It also suggests that gradual change is integral to the temporal process and is linked to all cosmic energy structures. This chapter also contends that micro-change shows its insidious power at macro-level in the visible cosmos and can be analyzed at micro-level in the invisible quantum state of subatomic particles.
