Instability of Chaplygin gas trajectories in unified dark matter models
Phys.Rev. D70 (2004) 121304 In the past few years, the Chaplygin gas (CG) has been considered as an appealing candidate for unifying dark matter and dark energy into a single substance. This picture had to face several problems when trying to fit its predictions with cosmological observations. We po...
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| creator | Perrotta, F Matarrese, S Torki, M |
| description | Phys.Rev. D70 (2004) 121304 In the past few years, the Chaplygin gas (CG) has been considered as an
appealing candidate for unifying dark matter and dark energy into a single
substance. This picture had to face several problems when trying to fit its
predictions with cosmological observations. We point out another potential
problem of this model, showing that, when the CG is described through a
classical scalar field, the corresponding trajectories are strongly unstable.
This implies that an extreme fine tuning must apply to the initial values of
the field in order to end up today with values allowed by observational data. |
| doi_str_mv | 10.48550/arxiv.astro-ph/0409740 |
| format | Article |
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appealing candidate for unifying dark matter and dark energy into a single
substance. This picture had to face several problems when trying to fit its
predictions with cosmological observations. We point out another potential
problem of this model, showing that, when the CG is described through a
classical scalar field, the corresponding trajectories are strongly unstable.
This implies that an extreme fine tuning must apply to the initial values of
the field in order to end up today with values allowed by observational data.</description><identifier>DOI: 10.48550/arxiv.astro-ph/0409740</identifier><language>eng</language><subject>Physics - Astrophysics of Galaxies ; Physics - Cosmology and Nongalactic Astrophysics ; Physics - Earth and Planetary Astrophysics ; Physics - High Energy Astrophysical Phenomena ; Physics - High Energy Physics - Phenomenology ; Physics - Instrumentation and Methods for Astrophysics ; Physics - Solar and Stellar Astrophysics</subject><creationdate>2004-09</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,780,885</link.rule.ids><linktorsrc>$$Uhttps://arxiv.org/abs/astro-ph/0409740$$EView_record_in_Cornell_University$$FView_record_in_$$GCornell_University$$Hfree_for_read</linktorsrc><backlink>$$Uhttps://doi.org/10.48550/arXiv.astro-ph/0409740$$DView paper in arXiv$$Hfree_for_read</backlink><backlink>$$Uhttps://doi.org/10.1103/PhysRevD.70.121304$$DView published paper (Access to full text may be restricted)$$Hfree_for_read</backlink></links><search><creatorcontrib>Perrotta, F</creatorcontrib><creatorcontrib>Matarrese, S</creatorcontrib><creatorcontrib>Torki, M</creatorcontrib><title>Instability of Chaplygin gas trajectories in unified dark matter models</title><description>Phys.Rev. D70 (2004) 121304 In the past few years, the Chaplygin gas (CG) has been considered as an
appealing candidate for unifying dark matter and dark energy into a single
substance. This picture had to face several problems when trying to fit its
predictions with cosmological observations. We point out another potential
problem of this model, showing that, when the CG is described through a
classical scalar field, the corresponding trajectories are strongly unstable.
This implies that an extreme fine tuning must apply to the initial values of
the field in order to end up today with values allowed by observational data.</description><subject>Physics - Astrophysics of Galaxies</subject><subject>Physics - Cosmology and Nongalactic Astrophysics</subject><subject>Physics - Earth and Planetary Astrophysics</subject><subject>Physics - High Energy Astrophysical Phenomena</subject><subject>Physics - High Energy Physics - Phenomenology</subject><subject>Physics - Instrumentation and Methods for Astrophysics</subject><subject>Physics - Solar and Stellar Astrophysics</subject><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><sourceid>GOX</sourceid><recordid>eNqNjr0OgjAURrs4GPUZvIsjUGOJOhP_dvfmKgWuFtrcViNvryE8gNNJvpzkO0Is1zJVuzyXGfKH3imGyC7xTSaV3G-VnIrTpQsRb2Qp9uAqKBr0tq-pgxoDRMaHuUfHZAL8tldHFZkSSuQntBijYWhdaWyYi0mFNpjFyJlYHQ_X4pwMx9oztci9HgK0b_QYsPnX-wIieEJ8</recordid><startdate>20040929</startdate><enddate>20040929</enddate><creator>Perrotta, F</creator><creator>Matarrese, S</creator><creator>Torki, M</creator><scope>GOX</scope></search><sort><creationdate>20040929</creationdate><title>Instability of Chaplygin gas trajectories in unified dark matter models</title><author>Perrotta, F ; Matarrese, S ; Torki, M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-arxiv_primary_astro_ph_04097403</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2004</creationdate><topic>Physics - Astrophysics of Galaxies</topic><topic>Physics - Cosmology and Nongalactic Astrophysics</topic><topic>Physics - Earth and Planetary Astrophysics</topic><topic>Physics - High Energy Astrophysical Phenomena</topic><topic>Physics - High Energy Physics - Phenomenology</topic><topic>Physics - Instrumentation and Methods for Astrophysics</topic><topic>Physics - Solar and Stellar Astrophysics</topic><toplevel>online_resources</toplevel><creatorcontrib>Perrotta, F</creatorcontrib><creatorcontrib>Matarrese, S</creatorcontrib><creatorcontrib>Torki, M</creatorcontrib><collection>arXiv.org</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Perrotta, F</au><au>Matarrese, S</au><au>Torki, M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Instability of Chaplygin gas trajectories in unified dark matter models</atitle><date>2004-09-29</date><risdate>2004</risdate><abstract>Phys.Rev. D70 (2004) 121304 In the past few years, the Chaplygin gas (CG) has been considered as an
appealing candidate for unifying dark matter and dark energy into a single
substance. This picture had to face several problems when trying to fit its
predictions with cosmological observations. We point out another potential
problem of this model, showing that, when the CG is described through a
classical scalar field, the corresponding trajectories are strongly unstable.
This implies that an extreme fine tuning must apply to the initial values of
the field in order to end up today with values allowed by observational data.</abstract><doi>10.48550/arxiv.astro-ph/0409740</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - High Energy Physics - Phenomenology Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics |
| title | Instability of Chaplygin gas trajectories in unified dark matter models |
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