Zobrazeno 1 - 10
of 122
pro vyhledávání: '"Giri, Sambit K."'
Autor:
Choudhury, Madhurima, Ghara, Raghunath, Zaroubi, Saleem, Ciardi, Benedetta, Koopmans, Leon V. E., Mellema, Garrelt, Shaw, Abinash Kumar, Acharya, Anshuman, Iliev, I. T., Ma, Qing-Bo, Giri, Sambit K.
The high redshift 21-cm signal promises to be a crucial probe of the state of the intergalactic medium (IGM). Understanding the connection between the observed 21-cm power spectrum and the physical quantities intricately associated with the IGM is cr
Externí odkaz:
http://arxiv.org/abs/2407.03523
The final stages of cosmic reionisation (EndEoR) are expected to be strongly regulated by the residual neutral hydrogen in the already ionised regions of the Universe. Its presence limits the mean distance that ionising photons can travel and hence,
Externí odkaz:
http://arxiv.org/abs/2405.04273
Autor:
Ghara, Raghunath, Shaw, Abinash Kumar, Zaroubi, Saleem, Ciardi, Benedetta, Mellema, Garrelt, Koopmans, Léon V. E., Acharya, Anshuman, Choudhury, Madhurima, Giri, Sambit K., Iliev, Ilian T., Ma, Qing-Bo, Mertens, Florent
Publikováno v:
A&A 687, A252 (2024)
The redshifted 21-cm signal from the epoch of reionization (EoR) directly probes the ionization and thermal states of the intergalactic medium during that period. In particular, the distribution of the ionized regions around the radiating sources dur
Externí odkaz:
http://arxiv.org/abs/2404.11686
Predicting the 21cm signal from the epoch of reionization and cosmic dawn is a complex and challenging task. Various simplifying assumptions have been applied over the last decades to make the modeling more affordable. In this paper, we investigate t
Externí odkaz:
http://arxiv.org/abs/2404.08042
Autor:
Giri, Sambit K., Bianco, Michele, Schaeffer, Timothée, Iliev, Ilian T., Mellema, Garrelt, Schneider, Aurel
During the epoch of reionization (EoR), the 21-cm signal allows direct observation of the neutral hydrogen (\hi{}) in the intergalactic medium (IGM). In the post-reionization era, this signal instead probes \hi{} in galaxies, which traces the dark ma
Externí odkaz:
http://arxiv.org/abs/2403.04838
We apply the inverse Gertsenshtein effect, i.e., the graviton-photon conversion in the presence of a magnetic field, to constrain high-frequency gravitational waves (HFGWs). Using existing astrophysical measurements, we compute upper limits on the GW
Externí odkaz:
http://arxiv.org/abs/2312.17636
Autor:
Hirling, Patrick, Bianco, Michele, Giri, Sambit K., Iliev, Ilian T., Mellema, Garrelt, Kneib, Jean-Paul
Detailed modeling of the evolution of neutral hydrogen in the intergalactic medium during the Epoch of Reionization, $5 \leq z \leq 20$, is critical in interpreting the cosmological signals from current and upcoming 21-cm experiments such as the Low-
Externí odkaz:
http://arxiv.org/abs/2311.01492
Publikováno v:
A&A 687, A161 (2024)
Although it is well known that the bulk of dark matter (DM) has to be cold, the existence of an additional sub-dominant, hot species remains a valid possibility. In this paper we investigate the potential of the cosmic shear power spectrum to constra
Externí odkaz:
http://arxiv.org/abs/2309.03865
Decaying dark matter (DDM) scenarios have recently regained attention due to their potential ability to resolve the well-known clustering (or $S_8$) tension between weak lensing (WL) and cosmic microwave background (CMB) measurements. In this paper,
Externí odkaz:
http://arxiv.org/abs/2307.03222
Publikováno v:
MNRAS, Volume 526, Issue 2, December 2023, Pages 2942 2959
In this study, we introduce BEoRN (Bubbles during the Epoch of Reionisation Numerical Simulator), a publicly available Python code that generates three-dimensional maps of the 21-cm signal from the cosmic dawn and the epoch of reionisation. Built upo
Externí odkaz:
http://arxiv.org/abs/2305.15466