Tracing Dark Energy History with Gamma-Ray Bursts
نویسندگان
چکیده
Observations of gamma-ray bursts up to $z\sim 9$ are best suited study the possible evolution Universe equation state at intermediate redshifts. We apply Combo-relation a sample 174 gamma ray investigate evidence evolving dark energy parameter $w(z)$. first build burst Hubble's diagram and then we estimate set ($\Omega_m$, $\Omega_{\Lambda}$) in framework flat non-flat $\Lambda$CDM paradigm. get bounds over $w$CDM model, where $w$ is thought evolve with redshift, adopting two priors Hubble constant tension $4.4$-$\sigma$, i.e. $H_0=(67.4\pm0.5)$ km/s/Mpc $H_0=(74.03\pm1.42)$ km/s/Mpc. show our new provides tighter constraints on $\Omega_m$ since $z\leq1.2$ see that $w(z)$ agrees within 1$\sigma$ standard value $w=-1$. The situation opposite larger $z$, better fix seems deviate from $w=-1$ $2$-$\sigma$ $4$-$\sigma$ level, depending redshift bins. In particular, through piecewise formulation seven intervals. From fitting procedure $z\geq 1.2$ case $w<-1$ cannot be fully excluded, indicating energy's influence not negligible $z$. confirm Combo relation as powerful tool cosmological energy. Future space missions will significantly enrich database even smaller redshifts, improving de facto results discussed this paper.
منابع مشابه
Constraining dark energy with gamma - ray bursts
We use the cosmology-independent gamma-ray burst (GRB) distances of Wang (2008) to constrain dark energy cosmological model parameters. Current GRB data alone can not tightly constrain cosmological parameters and allow for a wide range of dark energy models. When used jointly with current Type Ia supernovae data and baryon acoustic peak measurements, the GRB data favor slightly lower values of ...
متن کاملConstraining Ωm and Dark Energy with Gamma-ray Bursts
An Eγ,jet ∝ E ′ p 1.5 relationship with a small scatter for current γ-ray burst (GRB) data was recently reported, where Eγ,jet is the beaming-corrected γ-ray energy and E ′ p is the νFν peak energy in the local observer frame. By considering this relationship for a sample of 12 GRBs with known redshift, peak energy, and break time of afterglow light curves, we constrain the mass density of the ...
متن کاملProbing dark gamma‐ray bursts with neutrinos
Highly relativistic jets are a key element of current gamma-ray burst (GRB) models, where the jet kinetic energy is converted to radiation energy at optically thin shocks. Mildly relativistic jets with smaller Lorentz factors are typically optically thick to gamma rays, and do not produce the spectacular GRB phenomenon. Jets which stall inside the progenitor similarly do not produce a GRB. Howe...
متن کاملSwift Identification of Dark Gamma-ray Bursts
We present an optical flux vs. X-ray flux diagram for all known gamma-ray bursts (GRBs) for which an X-ray afterglow has been detected. We propose an operational definition of dark bursts as those bursts that are optically subluminous with respect to the fireball model, i.e., which have an optical-to-X-ray spectral index βOX < 0.5. Out of a sample of 52 GRBs we identify 5 dark bursts. The defin...
متن کاملHigh-energy neutrinos from gamma ray bursts.
We treat high-energy neutrino production in gamma ray bursts (GRBs). Detailed calculations of photomeson neutrino production are presented for the collapsar model, where internal nonthermal synchrotron radiation is the primary target photon field, and the supranova model, where external pulsar-wind synchrotron radiation provides important additional target photons. Detection of greater, similar...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2021
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/abd254