15 citations · 42 across the 17 of their papers we have counts for
17 papers
SCRIPT in the Cosmic Dawn: Distinguishing Redshift-Evolving Galaxy Populations with 21-cm Fluctuations
Janakee Raste, Tirthankar Roy Choudhury
Recent James Webb Space Telescope (JWST) observations suggest an unexpectedly high abundance of luminous galaxies at , challenging traditional models of star formatio…
Square Kilometer Array Synergies for the Epoch of Reionization and Cosmic Dawn
Anirban Chakraborty, Tirthankar R. Choudhury, Kanan K. Datta +15
Synergies with other instruments will be essential in making, verifying, and interpreting a detection of the cosmic 21-cm signal from the Epoch of Reionization (EoR) and Cosmic Daw…
Reconciling large-scale Lyman- correlations with the SCRIPT Semi-numerical Model
Saptarshi Sarkar, Tirthankar Roy Choudhury
Recent analyses of high-redshift Lyman- forest observations have revealed strong correlations on scales exceeding 200 cMpc at redshift z = 6. Reproducing these large-scale corre…
Nearest Neighbour-Based Statistics for 21cm-Galaxy Cross-Correlations in the Epoch of Reionization
Anirban Chakraborty, Kwanit Gangopadhyay, Arka Banerjee +1
21cm radiation from neutral hydrogen serves as a direct probe of the Epoch of Reionization. However, both its detection and physical interpretation are severely hindered by contami…
Gravitational Wave Informed Inference of 21-cm Global Signal Parameters
Avinash Tiwari, Sajad A. Bhat, Tirthankar Roy Choudhury +3
Understanding how and when the first stars and galaxies formed remains one of the central challenges in modern cosmology. These structures emerged during the transition from the Da…
Accelerating reionization constraints: An ANN-emulator framework for the SCRIPT Semi-numerical Model
Saptarshi Sarkar, Tirthankar Roy Choudhury
Constraining the Epoch of Reionization (EoR) with physically motivated simulations is hampered by the high cost of conventional parameter inference. We present an efficient emulato…
Can an Anti-de Sitter Vacuum in the Dark Energy Sector Explain JWST High-Redshift Galaxy and Reionization Observations?
Anirban Chakraborty, Tirthankar Roy Choudhury, Anjan Ananda Sen +1
The unexpectedly large abundance of UV-bright galaxies at discovered by the James Webb Space Telescope poses a significant challenge to the standard CDM cosmology. This w…
Capturing Small-Scale Reionization Physics: A Sub-Grid Model for Photon Sinks with SCRIPT
Tirthankar Roy Choudhury, Anirban Chakraborty
The epoch of reionization represents a major phase transition in cosmic history, during which the first luminous sources ionized the intergalactic medium (IGM). However, the small-…
Probing Reionization-Era Galaxies with JWST UV Luminosity Functions and Large-Scale Clustering
Anirban Chakraborty, Tirthankar Roy Choudhury
JWST has transformed our understanding of early galaxy formation, providing an unprecedented view of the first billion years of cosmic history. In this work, we build upon our prev…
Reionization and its sources
Anirban Chakraborty, Tirthankar Roy Choudhury
Reionization represents an important phase in the history of our Universe when ultraviolet radiation from the first luminous sources, primarily stars and accreting black holes, ion…
Efficient hybrid technique for generating sub-grid haloes in reionization simulations
Ankur Barsode, Tirthankar Roy Choudhury
Simulating the distribution of cosmological neutral hydrogen (HI) during the epoch of reionization requires a high dynamic range and is hence computationally expensive. The size of…
Modelling the star-formation activity and ionizing properties of high-redshift galaxies
Anirban Chakraborty, Tirthankar Roy Choudhury
Early results from the JWST observations have reported a surprisingly high number of UV-bright galaxies at , which appears to challenge the theoretical predictions from…
Simulating the epoch of Helium Reionization in photon-conserving semi-numerical code SCRIPT
Akanksha Kapahtia, Tirthankar Roy Choudhury
The reionization of the second electron of helium (HeII) leaves important imprints on the thermal and ionization state of the intergalactic medium (IGM). Observational evidence sug…
A GPR-Based Emulator for Semi-numerical Reionization Code SCRIPT: Parameter Inference from 21 cm Data
T. Roy Choudhury, A. Paranjape, B. Maity
Semi-numerical models of reionization typically involve a large number of unknown parameters whose values are constrained by comparing with observations. Increasingly often, explor…
Probing the Physics of Reionization Using kSZ Power Spectrum from Current and Upcoming CMB Surveys
Divesh Jain, Tirthankar Roy Choudhury, Srinivasan Raghunathan +1
The patchiness in the reionization process alters the statistics of Cosmic Microwave Background (CMB), with the kinematic Sunyaev-Zeldovich (kSZ) effect in the CMB temperature powe…
Studying neutral hydrogen structures during the epoch of reionization using fractal dimensions
Bidisha Bandyopadhyay, T. Roy Choudhury, T. R. Seshadri
Fractal dimensions can be used to characterize the clustering and lacunarities in density distributions. We use generalized fractal dimensions to study the neutral hydrogen distrib…
Analytical Models of the Intergalactic Medium and Reionization
T. Roy Choudhury
Reionization is a process whereby hydrogen (and helium) in the Universe is ionized by the radiation from first luminous sources. Theoretically, the importance of the reionization l…