Tracing Dark Energy History with Gamma-Ray Bursts
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Tracing Dark Energy History with Gamma-Ray Bursts. / Muccino, M.; Izzo, L.; Luongo, O.; Boshkayev, K.; Amati, L.; Della Valle, M.; Pisani, G. B.; Zaninoni, E.
In: Astrophysical Journal, Vol. 908, No. 2, 181, 02.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Tracing Dark Energy History with Gamma-Ray Bursts
AU - Muccino, M.
AU - Izzo, L.
AU - Luongo, O.
AU - Boshkayev, K.
AU - Amati, L.
AU - Della Valle, M.
AU - Pisani, G. B.
AU - Zaninoni, E.
PY - 2021/2
Y1 - 2021/2
N2 - Observations of gamma-ray bursts up to z similar to 9 are best suited to study the possible evolution of the universe equation of state at intermediate redshifts. We apply the Combo relation to a sample of 174 gamma-ray bursts to investigate possible evidence of evolving dark energy parameter w(z). We first build a gamma-ray burst Hubble's diagram and then we estimate the set (omega(m), omega(?)) in the framework of flat and non-flat ?CDM paradigm. We then get bounds over the wCDM model, where w is thought to evolve with redshift, adopting two priors over the Hubble constant in tension at 4.4 sigma, i.e., H-0 = (67.4 0.5) km s(-1) Mpc(-1) and H-0 = (74.03 1.42) km s(-1) Mpc(-1). We show our new sample provides tighter constraints on omega(m) since at z = 1.2 the case w <-1 cannot be fully excluded, indicating that dark energy's influence is not negligible at larger z. We confirm the Combo relation as a powerful tool to investigate cosmological evolution of dark energy. Future space missions will significantly enrich the gamma-ray burst database even at smaller redshifts, improving de facto the results discussed in this paper.
AB - Observations of gamma-ray bursts up to z similar to 9 are best suited to study the possible evolution of the universe equation of state at intermediate redshifts. We apply the Combo relation to a sample of 174 gamma-ray bursts to investigate possible evidence of evolving dark energy parameter w(z). We first build a gamma-ray burst Hubble's diagram and then we estimate the set (omega(m), omega(?)) in the framework of flat and non-flat ?CDM paradigm. We then get bounds over the wCDM model, where w is thought to evolve with redshift, adopting two priors over the Hubble constant in tension at 4.4 sigma, i.e., H-0 = (67.4 0.5) km s(-1) Mpc(-1) and H-0 = (74.03 1.42) km s(-1) Mpc(-1). We show our new sample provides tighter constraints on omega(m) since at z = 1.2 the case w <-1 cannot be fully excluded, indicating that dark energy's influence is not negligible at larger z. We confirm the Combo relation as a powerful tool to investigate cosmological evolution of dark energy. Future space missions will significantly enrich the gamma-ray burst database even at smaller redshifts, improving de facto the results discussed in this paper.
KW - Standard candles
KW - Dark energy
KW - Gamma-ray bursts
U2 - 10.3847/1538-4357/abd254
DO - 10.3847/1538-4357/abd254
M3 - Journal article
VL - 908
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 181
ER -
ID: 260403085