GB3 - Cosmology from GRBs |
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Speaker |
Izzo, Luca |
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Coauthors |
M. Muccino, E. Zaninoni, L. Amati, M. Della Valle |
| Talk Title |
A new measurement of $\Omega_m$ from Gamma--ray Bursts |
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Abstract |
We present and discuss the existence of a tight relation for GRBs, named "Combo-relation", based on characteristic parameters of GRB prompt and afterglow phenomenology. The core of the proposed method consists in a light-curve fitting procedure, similar to the SNe Ia sample, and then recover the estimate of the initial luminosity of the shallow phase, which represents "the ruler" of the proposed relation. We use it to measure $\Omega_m$ and the evolution of the dark energy equation of state. We also discuss the use a new calibration method for the same relation, which reduces the dependence on SNe Ia systematics. |
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