Can the initial singularity be detected by cosmological tests?

2005
journal article
article
22
dc.abstract.enIn this paper, we raised the question of whether initial cosmological singularity can be proven by cosmological tests. The classical general relativity theory predicts the existence of singularity in the past if only some energy conditions are satisfied. On the other hand, the latest quantum gravity applications to cosmology suggest the possibility of avoiding the singularity and replacing it with a bounce. Bounce is the moment in the evolution of the Universe when the Universe’s size is minimum. Therefore the existence of observationally detected bounce in the Universe’s past could indicate the validity of the loop quantum gravity hypothesis and nonexistence of initial singularity which is present in the classical \LambdaCDM. We investigated the bouncing model described by the generalized Friedmann-Robertson-Walker equation in the context of the observations of the currently accelerating universe. The distant type Ia supernovae data are used to constrain the bouncing evolutional scenario where the square of the Hubble function $H^2$ is given by the formula $H^2 = H_0^2 [ \Omega_{m,0} (1 + z)^m - \Omega_{n,0} (1 - z)^n]$, where $\Omega_{m,0}, \Omega_{n,0} > 0$ are density parameters and n > m > 0. In this paper are shown that, on the basis of the SNIa data, standard bouncing models can be ruled out at the $4\sigma$ confidence level. After adding the cosmological constant to the standard bouncing model (the extended bouncing model), we obtained as the best fit that the parameter $\Omega_{n,0}$ is equal to zero which means that the SNIa data do not support the bouncing term in the model. The bouncing term is statistically insignificant on the present epoch. We also demonstrated that BBN offers the possibility of obtaining stringent constraints of the extra term $\Omega_{n,0}$. The other observational test methods like CMB and the age of oldest objects in the Universe are also used. We use as well the Akaike informative criterion to select a model which best fits data and we concluded that the bouncing term should be ruled out by Occam’s razor, which makes the big-bang scenario more favorable than the bouncing scenario.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.affiliationWydział Zarządzania i Komunikacji Społecznej : Instytut Spraw Publicznychpl
dc.contributor.authorSzydłowski, Marek - 132281 pl
dc.contributor.authorGodłowski, Włodzimierzpl
dc.contributor.authorKrawiec, Adam - 100491 pl
dc.contributor.authorGolbiak, Jacekpl
dc.date.accessioned2020-05-18T20:22:48Z
dc.date.available2020-05-18T20:22:48Z
dc.date.issued2005pl
dc.description.number6pl
dc.description.volume72pl
dc.identifier.articleid063504pl
dc.identifier.doi10.1103/PhysRevD.72.063504pl
dc.identifier.eissn1550-2368pl
dc.identifier.issn1550-7998pl
dc.identifier.projectROD UJ / Opl
dc.identifier.urihttps://ruj.uj.edu.pl/xmlui/handle/item/156073
dc.languageengpl
dc.language.containerengpl
dc.rightsDodaję tylko opis bibliograficzny*
dc.rights.licencebez licencji
dc.rights.uri*
dc.subtypeArticlepl
dc.titleCan the initial singularity be detected by cosmological tests?pl
dc.title.journalPhysical Review. D, Particles, Fields, Gravitation, and Cosmologypl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
In this paper, we raised the question of whether initial cosmological singularity can be proven by cosmological tests. The classical general relativity theory predicts the existence of singularity in the past if only some energy conditions are satisfied. On the other hand, the latest quantum gravity applications to cosmology suggest the possibility of avoiding the singularity and replacing it with a bounce. Bounce is the moment in the evolution of the Universe when the Universe’s size is minimum. Therefore the existence of observationally detected bounce in the Universe’s past could indicate the validity of the loop quantum gravity hypothesis and nonexistence of initial singularity which is present in the classical \LambdaCDM. We investigated the bouncing model described by the generalized Friedmann-Robertson-Walker equation in the context of the observations of the currently accelerating universe. The distant type Ia supernovae data are used to constrain the bouncing evolutional scenario where the square of the Hubble function $H^2$ is given by the formula $H^2 = H_0^2 [ \Omega_{m,0} (1 + z)^m - \Omega_{n,0} (1 - z)^n]$, where $\Omega_{m,0}, \Omega_{n,0} > 0$ are density parameters and n > m > 0. In this paper are shown that, on the basis of the SNIa data, standard bouncing models can be ruled out at the $4\sigma$ confidence level. After adding the cosmological constant to the standard bouncing model (the extended bouncing model), we obtained as the best fit that the parameter $\Omega_{n,0}$ is equal to zero which means that the SNIa data do not support the bouncing term in the model. The bouncing term is statistically insignificant on the present epoch. We also demonstrated that BBN offers the possibility of obtaining stringent constraints of the extra term $\Omega_{n,0}$. The other observational test methods like CMB and the age of oldest objects in the Universe are also used. We use as well the Akaike informative criterion to select a model which best fits data and we concluded that the bouncing term should be ruled out by Occam’s razor, which makes the big-bang scenario more favorable than the bouncing scenario.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.affiliationpl
Wydział Zarządzania i Komunikacji Społecznej : Instytut Spraw Publicznych
dc.contributor.authorpl
Szydłowski, Marek - 132281
dc.contributor.authorpl
Godłowski, Włodzimierz
dc.contributor.authorpl
Krawiec, Adam - 100491
dc.contributor.authorpl
Golbiak, Jacek
dc.date.accessioned
2020-05-18T20:22:48Z
dc.date.available
2020-05-18T20:22:48Z
dc.date.issuedpl
2005
dc.description.numberpl
6
dc.description.volumepl
72
dc.identifier.articleidpl
063504
dc.identifier.doipl
10.1103/PhysRevD.72.063504
dc.identifier.eissnpl
1550-2368
dc.identifier.issnpl
1550-7998
dc.identifier.projectpl
ROD UJ / O
dc.identifier.uri
https://ruj.uj.edu.pl/xmlui/handle/item/156073
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Dodaję tylko opis bibliograficzny
dc.rights.licence
bez licencji
dc.rights.uri*
dc.subtypepl
Article
dc.titlepl
Can the initial singularity be detected by cosmological tests?
dc.title.journalpl
Physical Review. D, Particles, Fields, Gravitation, and Cosmology
dc.typepl
JournalArticle
dspace.entity.type
Publication

* The migration of download and view statistics prior to the date of April 8, 2024 is in progress.

Views
10
Views per month
Views per city
Ashburn
4
Dublin
2
Wroclaw
2
Sofia
1

No access

No Thumbnail Available