Atypical k-essence cosmologies
We analyze the implications of having a divergent speed of sound in k-essence cosmological models. We first study a known theory of that kind, for which the Lagrangian density depends linearly on the time derivative of the k-field. We show that when k-essence is the only source consistency requires...
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| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
2005
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
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| LEADER | 05848caa a22008297a 4500 | ||
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| 001 | PAPER-4266 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203348.0 | ||
| 008 | 140217s2005 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-16844364940 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a PRVDA | ||
| 100 | 1 | |a Chimento, L.P. | |
| 245 | 1 | 0 | |a Atypical k-essence cosmologies |
| 260 | |c 2005 | ||
| 270 | 1 | 0 | |m Chimento, L.P.; Dpto. de Física, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina; email: chimento@df.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a We analyze the implications of having a divergent speed of sound in k-essence cosmological models. We first study a known theory of that kind, for which the Lagrangian density depends linearly on the time derivative of the k-field. We show that when k-essence is the only source consistency requires that the potential of the k-field be of the inverse square form. Then, we review the known result that the corresponding power-law solutions can be mapped to power-law solutions of theories with no divergence in the speed of sound. After that, we argue that the requirement of a divergent sound speed at some point fixes uniquely the form of the Lagrangian to be exactly the one considered earlier and prove the asymptotic stability of the most interesting solutions belonging to the divergent theory. Then, we discuss the implications of having not just k-essence but also matter. This is interesting because introducing another component breaks the rigidity of the theory, and the form of the potential ceases to be unique as happened in the pure k-essence case. Finally, we show the finiteness of the effective sound speed under an appropiate definition. © 2005 The American Physical Society. |l eng | |
| 593 | |a Dpto. de Física, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina | ||
| 593 | |a Fis. Teorikoa eta Zientziaren H. S., Zientzia eta Teknol. Fakultatea, Euskal Herriko Unibertsitatea, 644 Posta Kutxatila, 48080 Bilbao, Spain | ||
| 690 | 1 | 0 | |a ARTICLE |
| 690 | 1 | 0 | |a COSMOLOGICAL PHENOMENA |
| 690 | 1 | 0 | |a COSMOS |
| 690 | 1 | 0 | |a DENSITY |
| 690 | 1 | 0 | |a LANGRANGIAN MODEL |
| 690 | 1 | 0 | |a MATHEMATICAL MODEL |
| 690 | 1 | 0 | |a POWER LAW SOLUTION |
| 690 | 1 | 0 | |a PROBLEM SOLVING |
| 690 | 1 | 0 | |a RIGIDITY |
| 690 | 1 | 0 | |a SOUND |
| 690 | 1 | 0 | |a VELOCITY |
| 700 | 1 | |a Lazkoz, R. | |
| 773 | 0 | |d 2005 |g v. 71 |h pp. 023505-1-023505-7 |k n. 2 |p Phys Rev D Part Fields Gravit Cosmol |x 15507998 |t Physical Review D - Particles, Fields, Gravitation and Cosmology | |
| 856 | 4 | 1 | |u http://www.scopus.com/inward/record.url?eid=2-s2.0-16844364940&partnerID=40&md5=f88d3fb5b742655935f4096956aef8fa |y Registro en Scopus |
| 856 | 4 | 0 | |u https://doi.org/10.1103/PhysRevD.71.023505 |y DOI |
| 856 | 4 | 0 | |u https://hdl.handle.net/20.500.12110/paper_15507998_v71_n2_p023505_Chimento |y Handle |
| 856 | 4 | 0 | |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v71_n2_p023505_Chimento |y Registro en la Biblioteca Digital |
| 961 | |a paper_15507998_v71_n2_p023505_Chimento |b paper |c PE | ||
| 962 | |a info:eu-repo/semantics/article |a info:ar-repo/semantics/artículo |b info:eu-repo/semantics/publishedVersion | ||
| 963 | |a VARI | ||
| 999 | |c 65219 | ||