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GRAVITY HEATS THE UNIVERSE.

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Title: GRAVITY HEATS THE UNIVERSE.
Authors: MOSS, ADAM1 adammoss@phas.ubc.ca, SCOTT, DOUGLAS1 dscott@astro.ubc.ca
Source: International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology. Dec2009, Vol. 18 Issue 14, p2201-2207. 7p. 3 Graphs.
Subjects: Metaphysical cosmology, Cosmic background radiation, Potential energy surfaces, Stopping power (Nuclear physics), Astrophysical collisions, Astronomy
Abstract: Structures in the Universe grew through gravitational instability from very smooth initial conditions. Energy conservation requires that the growing negative potential energy of these structures be balanced by an increase in kinetic energy. A fraction of this is converted into heat in the collisional gas of the intergalactic medium. Using a toy model of gravitational heating, we attempt to link the growth of structure in the Universe with the average temperature of this gas. We find that the gas is rapidly heated from collapsing structures at around z ~ 10, reaching a temperature > 106K today, depending on some assumptions of our simplified model. Before that there was a cold era from z ~ 100 to ~10 in which the matter temperature was below that of the cosmic microwave background. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: <searchLink fieldCode="DE" term="%22Metaphysical+cosmology%22">Metaphysical cosmology</searchLink><br /><searchLink fieldCode="DE" term="%22Cosmic+background+radiation%22">Cosmic background radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Potential+energy+surfaces%22">Potential energy surfaces</searchLink><br /><searchLink fieldCode="DE" term="%22Stopping+power+%28Nuclear+physics%29%22">Stopping power (Nuclear physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Astrophysical+collisions%22">Astrophysical collisions</searchLink><br /><searchLink fieldCode="DE" term="%22Astronomy%22">Astronomy</searchLink>
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  Data: Structures in the Universe grew through gravitational instability from very smooth initial conditions. Energy conservation requires that the growing negative potential energy of these structures be balanced by an increase in kinetic energy. A fraction of this is converted into heat in the collisional gas of the intergalactic medium. Using a toy model of gravitational heating, we attempt to link the growth of structure in the Universe with the average temperature of this gas. We find that the gas is rapidly heated from collapsing structures at around z ~ 10, reaching a temperature > 106K today, depending on some assumptions of our simplified model. Before that there was a cold era from z ~ 100 to ~10 in which the matter temperature was below that of the cosmic microwave background. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1142/S021827180901603X
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        Text: English
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      – SubjectFull: Metaphysical cosmology
        Type: general
      – SubjectFull: Cosmic background radiation
        Type: general
      – SubjectFull: Potential energy surfaces
        Type: general
      – SubjectFull: Stopping power (Nuclear physics)
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      – SubjectFull: Astrophysical collisions
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      – SubjectFull: Astronomy
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      – TitleFull: GRAVITY HEATS THE UNIVERSE.
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              Text: Dec2009
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              Y: 2009
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