The Acceleration of the Universe: Measurements of Cosmological Parameters from Type Ia Supernovae

Goobar, A.; Perlmutter, S.; Aldering, G.; Goldhaber, G.; Knop, R. A.; Nugent, P.; Castro, Paulo Francisco de; Deustua, Susana E.; Fabbro, S.; Groom, D. E.; Hook, I. M.; Kim, A. G.; Kim, M. Y.; Lee, J. C.; Nunes, Nelson J.; Pain, R.; Pennypacker, C.; Quimby, R.; Lidman, C.; Ellis, R. S.; M., Irwin,; McMahon, R. G.; Ruiz-Lapuente, P.; Walton, N. A.; Schaefer, Barbara A.; Boyle, B. J.; Filippenko, A. V.; Matheson, T.; Fruchter, A.; Panagia, N.; Newberg, Heidi Jo; Couch, Warrick J.

doi:10.1142/9789812810434_0005

Cited by 7 publications

(10 citation statements)

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“…The three data sets we have used in this analysis are the supernovae (SNIa) observations, Hubble parameter(H(z) observations and the baryon acoustic oscillation(BAO) data. Type Ia supernovae are standard candles and are useful in determining the expansion history of the universe [1][2][3][4][5][6][7][8][9]. The supernova's apparent brightness determines its distance from the observer and the time taken by photons to reach to the observer.…”

Section: Observationsmentioning

confidence: 99%

“…The acceleration of the cosmic expansion is one of the most important discoveries in present day cosmology [1][2][3][4][5][6][7][8][9]. This acceleration requires that nearly three-quarters of the energy of the universe is in a component with a negative pressure, namely dark energy.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we study dark energy modeled by a barotropic fluid, in the context of present observations. We consider three different scenarios, namely, a constant equation of state parameter of dark energy, and three different parameterizations of dark energy parameter with a variable w. In this paper, we use type Ia supernova (SNIa) data [1][2][3][4][5][6][7][8][9], Baryon Acoustic Oscillation(BAO) data [46][47][48][49][50][51][52] and Hubble parameter (H(z)) data [53][54][55][56][57][58][59][60][61][62]. Other potential observational constraints include those from Gamma Ray Bursts (GRB) data [63][64][65][66][67], angular size versus redshift data [68,69], Cosmic Microwave Background (CMB) data [70,71].…”

Section: Introductionmentioning

confidence: 99%

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Dark energy equation of state parameter and its evolution at low redshift

Tripathi

Sangwan

Jassal

2017

J. Cosmol. Astropart. Phys.

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In this paper, we constrain dark energy models using a compendium of observations at low redshifts. We consider the dark energy as a barotropic fluid, with the equation of state a constant as well the case where dark energy equation of state is a function of time. The observations considered here are Supernova Type Ia data, Baryon Acoustic Oscillation data and Hubble parameter measurements. We compare constraints obtained from these data and also do a combined analysis. The combined observational constraints put strong limits on variation of dark energy energy density with redshift. For varying dark energy models, the range of parameters preferred by the supernova type Ia data is in tension with the other low redshift distance measurements.

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Section: Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dark energy equation of state parameter and its evolution at low redshift

Tripathi

Sangwan

Jassal

2017

J. Cosmol. Astropart. Phys.

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“…and is the critical density as defined by its role in the (first) Friedmann equation in GR. The SN 1a data permit estimates of the deceleration parameter that are relatively independent of the cosmological model and consistently indicate a negative value of q 1 Ω = 0 , [35][36][37], at variance with the prediction above that for all time. 2 q ≥…”

Section: Negative Energy Vacuummentioning

confidence: 55%

“…Equations ( 32) and (34) (or (35)) correspond respectively to the first and second Friedmann equations of GR. We observe that Eq.…”

Section: Friedmann Equationsmentioning

confidence: 99%

Cosmological test of the Yilmaz theory of gravity

Ibison

2006

Class. Quantum Grav.

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Abstract.We test the Yilmaz theory of gravitation by working out the corresponding Friedmanntype equations generated by assuming the Friedmann-Robertson-Walker cosmological metrics. In the case that space is flat the theory is consistent only with either a completely empty universe, or with a negative energy vacuum that decays to produce a constant density of matter. In both cases the total energy remains zero at all times, and in the latter case the acceleration of the expansion is always negative. To obtain a more flexible and potentially more realistic cosmology the equation of state relating the pressure and energy density of the matter creation process must be different from the vacuum, as for example is the case in the steady-state models of Gold, Bondi, Hoyle and others. The theory does not support the Cosmological Principle for curved space 0 K ≠ cosmological metrics.

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Reconstructing the dark energy potential

Sangwan

Mukherjee

Jassal

2018

J. Cosmol. Astropart. Phys.

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Abstract. Dark energy equation of state can be effectively described by that of a barotropic fluid. The barotropic fluid model describes the background evolution and the functional form of the equation of state parameter is well constrained by the observations. Equally viable explanations of dark energy are via scalar field models, both canonical and non-canonical; these scalar field models being low energy descriptions of an underlying high energy theory. In this paper, we attempt to reconcile the two approaches to dark energy by way of reconstructing the evolution of the scalar field potential. For this analysis, we consider canonical quintessence scalar field and the phantom field for this reconstruction. We attempt to understand the analytical or semi-analytical forms of scalar field potentials corresponding to typical well behaved parameterisations of dark energy using the constraints from recent observations.

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The Acceleration of the Universe: Measurements of Cosmological Parameters from Type Ia Supernovae

Cited by 7 publications

References 0 publications

Dark energy equation of state parameter and its evolution at low redshift

Dark energy equation of state parameter and its evolution at low redshift

Cosmological test of the Yilmaz theory of gravity

Reconstructing the dark energy potential

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