Ritanjan Das
A5053942246- Social and Economic Development in India
- Political Economy and Marxism
- Indian Economic and Social Development
- Southeast Asian Sociopolitical Studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Urban and Rural Development Challenges
- Economic Theory and Policy
- Anthropological Studies and Insights
- Gamma-ray bursts and supernovae
- Agriculture, Land Use, Rural Development
- Cosmology and Gravitation Theories
- Urban Planning and Governance
- Politics and Society in Latin America
- Political and Economic history of UK and US
- Bangladesh Politics, Society, and Development
- Social Policy and Reform Studies
- South Asian Studies and Conflicts
- Labor Movements and Unions
- Hydropower, Displacement, Environmental Impact
- Gaussian Processes and Bayesian Inference
- Post-Soviet Geopolitical Dynamics
- CCD and CMOS Imaging Sensors
- Paranormal Experiences and Beliefs
- Elite Sociology and Global Capitalism
Leiden University
2023-2024
University of Portsmouth
2006-2023
University of Michigan
2016-2019
Fermi National Accelerator Laboratory
2014-2016
Kavli Institute for Particle Astrophysics and Cosmology
2016
Cerro Tololo Inter-American Observatory
2014
London School of Economics and Political Science
2009
York University
2009
We present cosmological results from a combined analysis of galaxy clustering and weak gravitational lensing, using 1321 deg$^2$ $griz$ imaging data the first year Dark Energy Survey (DES Y1). combine three two-point functions: (i) cosmic shear correlation function 26 million source galaxies in four redshift bins, (ii) angular autocorrelation 650,000 luminous red five (iii) galaxy-shear cross-correlation positions shears. To demonstrate robustness these results, we use independent pairs...
Abstract We describe the first public data release of Dark Energy Survey, DES DR1, consisting reduced single-epoch images, co-added source catalogs, and associated products services assembled over 3 yr science operations. DR1 is based on optical/near-infrared imaging from 345 distinct nights (2013 August to 2016 February) by Camera mounted 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile. wide-area survey covering ∼5000 deg 2 southern Galactic cap five broad...
We present the first constraints on cosmology from Dark Energy Survey (DES), using weak lensing measurements preliminary Science Verification (SV) data. use 139 square degrees of SV data, which is less than 3% full DES survey area. Using cosmic shear 2-point over three redshift bins we find ${\ensuremath{\sigma}}_{8}({\mathrm{\ensuremath{\Omega}}}_{\mathrm{m}}/0.3{)}^{0.5}=0.81\ifmmode\pm\else\textpm\fi{}0.06$ (68% confidence), after marginalizing 7 systematics parameters and 3 other...
We present weak lensing shear catalogues for 139 square degrees of data taken during the Science Verification (SV) time new Dark Energy Camera (DECam) being used Survey (DES). describe our object selection, point spread function estimation and measurement procedures using two independent pipelines, im3shape ngmix, which produce 2.12 million 3.44 galaxies, respectively. detail a set null tests measurements find that they pass requirements systematic errors at level necessary science...
The Dark Energy Survey (DES) is a next generation optical survey aimed at understanding the accelerating expansion of universe using four complementary methods: weak gravitational lensing, galaxy cluster counts, baryon acoustic oscillations, and Type Ia supernovae. To perform 5000 sq-degree wide field 30 supernova surveys, DES Collaboration built Camera (DECam), 3 square-degree, 570-Megapixel CCD camera that was installed prime focus Blanco 4-meter telescope Cerro Tololo Inter-American...
Using the science verification data of Dark Energy Survey (DES) for a new sample 106 X-Ray selected clusters and groups, we study stellar mass growth Bright Central Galaxies (BCGs) since redshift 1.2. Compared with expectation in semi-analytical model applied to Millennium Simulation, observed BCGs become under-massive/under-luminous decreasing redshift. We incorporate uncertainties associated cluster mass, redshift, BCG measurements into analysis redshift-dependent BCG-cluster relation,...
The Dark Energy Survey (DES) is an operating optical survey aimed at understanding the accelerating expansion of universe using four complementary methods: weak gravitational lensing, galaxy cluster counts, baryon acoustic oscillations, and Type Ia supernovae. To perform 5000 sq-degree wide field 30 supernova surveys, DES Collaboration built Camera (DECam), a 3 square-degree, 570-Megapixel CCD camera that was installed prime focus Blanco 4-meter telescope Cerro Tololo Inter-American...
This article contributes to the growing literature on political dynasticism in contemporary South Asia and shifts focus from much-debated national level dynasties usually ignored operating at subnational regional levels. Analytically, it investigates 'moment' of succession, conceptualised as period when new heirs are actively enrolled a dynastic formation. Such moments succession can be perilous for formations, potentially disrupting its routine functioning style. And yet, these allow clear...
This article examines the political narratives around a two-decade -old process of land acquisition and development in "global city" Rajarhat, former rural settlement Indian state West Bengal. These are built against backdrop neoliberal acting as corporate facilitator, particularly matters land, concomitant dispossession. The multifaceted politics Rajarhat took shape during erstwhile communist regime Bengal, dichotomy self-identified Left engaged forceful violent thus forming an interesting...
Revisiting the citizenship regimes of Myanmar and India through a comparative lens, this article argues that specter "potential foreigner" is decisive in adjudication both countries. Citizenship conceptualized not only on basis who citizen, but perennial suspicion towards those may be. We frame argument context increasingly restrictive atmospheres countries, epitomized by violence Rohingya Amendment Act India. This paper employs an historical perspective, tracing evolution since partitions...
This article provides a historical perspective on rather unique chapter in the era of economic reforms India—the case state West Bengal. In 1991, Government India began to pursue policy liberalization, causing serious political challenges for Communist Party India-Marxist (CPIM)-led Left Front coalition Historically, CPIM had strongly opposed reforms, but was compelled undertake ‘transition’ owing stagnating economy state. The transition, and motivations behind it, topic debated...
Using $\sim 100$ X-ray selected clusters in the Dark Energy Survey Science Verification data, we constrain luminosity function (LF) of cluster red sequence galaxies as a redshift. This is first homogeneous optical/X-ray sample large enough to evolution simultaneously redshift ($0.1
India's rapid economic growth has frequently been marred by struggles over land acquisition and displacement. This paper re-examines one such case. In 2006, protests erupted in Singur (a small cluster of villages West Bengal) against government initiatives to acquire for a private industrial project. The gathered enough momentum stall the project, went on have decisive impact electoral fortunes government, thus attaining cult status country's development-displacement narratives. presents...
With the victory of capitalism and end Cold War, almost all countries in global south, including those still calling themselves “communist,” have become “transition” countries, competing to attract foreign direct investment reform according strictures capitalism. Particularly interesting cases are states that explicitly legitimize their rule terms communist ideals, general alliance peasants workers toward an egalitarian society, whose ideological pillars historically include a pro-poor re-...
As large-scale international collaborations become the standard for astronomy research, a wealth of opportunities have emerged to create innovative education and public outreach (EPO) programming. In past two decades, large focused EPO strategies around published data products. Newer begun explore other avenues engagement before after are made available. We present case study online program The Dark Energy Survey, currently one largest actively taking data. DES is unique at this scale in...
This paper presents a theoretical reassessment of contentious chapter in India's economic liberalisation – the case West Bengal, state ruled by pro-labour 'Left Front' coalition, led Communist Party India-Marxist (CPIM) from 1997 to 2011. The onset neoliberalism India had naturally created serious political dilemma for CPIM, but it eventually transitioned private-industrialisation agenda, thus prompting questions ideological deviation. While political-economy CPIM/Left Front and its...
Analogous to the Euro-American context, Indian cities are usually conceptualised as socio-spatial forms where communities at peripheries of 'development' constitute 'urban margins'. However, such conceptualisations rarely interrogate varied aspects marginality within those spaces. Drawing from an ethnography with dispossessed peasantry (in villages') and migrant labour slums/jhuggis) in Noida, a north-Indian city, we unpack three marginality. First, process marginalisation; second, two...