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where I'd like to be ...

Prof Subir Sarkar

Professor Emeritus

Research theme

  • Particle astrophysics & cosmology
  • Fundamental particles and interactions

Sub department

  • Rudolf Peierls Centre for Theoretical Physics

Research groups

  • Particle theory
  • FASER2
Subir.Sarkar@physics.ox.ac.uk
Telephone: 01865 (2)73962
Rudolf Peierls Centre for Theoretical Physics, room 60.12
Old homepage
Brief CV
  • About
  • Research
  • Teaching
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  • Outreach
  • Awards/News
  • IceCube@Oxford
  • Publications

IceCube

Physics World 2013 Breakthrough of the Year
IceCube at Oxford

I am a member since 2004 of the IceCube collaboration which discovered cosmic high energy neutrinos and identified some of their astrophysical sources.

IceCube @ Oxford

Searching for neutrino transients below 1 TeV with IceCube

Sissa Medialab Srl (2021) 1131

Authors:

Michael J Larson, Rasha Abbasi, Markus Ackermann, Jenni Adams, Juanan Aguilar, M Ahlers, Maryon Ahrens, Cyril Martin Alispach, Antonio Augusto Alves Junior, Najia Moureen Binte Amin, Rui An, Karen Andeen, Tyler Anderson, Gisela Anton, Carlos Arguelles, Yosuke Ashida, Spencer Axani, Xinhua Bai, Aswathi Balagopal V., Anastasia Maria Barbano, SW Barwick, Benjamin Bastian, Vedant Basu, Sebastian Baur, RC Bay, JJ Beatty, K-H Becker, Julia Becker Tjus, Chiara Bellenghi, Segev BenZvi, D Berley, Elisa Bernardini, DZ Besson, Gary Binder, Daniel Bindig, E Blaufuss, Summer Blot, Matthias Boddenberg, Federico Bontempo, Jurgen Borowka, S Boser, Olga Botner, Jakob Boettcher, Etienne Bourbeau, Federica Bradascio, J Braun, Stephanie Bron, Jannes Brostean-Kaiser, Sally-Ann Browne, Alexander Burgman, Ryan T Burley, Raffaela Busse, Michael Campana, Erin Carnie-Bronca, Chujie Chen, Dmitry Chirkin, Koun Choi, Bryanlee Clark, Kenneth Clark, Lew Classen, Alan Coleman, Gabriel Collin, JM Conrad, Paul Coppin, Pablo Correa, DF Cowen, R Cross, Christian Dappen, Pranav Dave, Catherine DE CLERCQ, James DeLaunay, Hans Dembinski, Kunal Deoskar, Sam De Ridder, Abhishek Desai, Paolo Desiati, Krijn de Vries, Gwenhaël de Wasseige, Meike De With, Tyce DeYoung, Sukeerthi Dharani, Alejandro Diaz, Juan Carlos Diaz-Velez, Markus Dittmer, Hrvoje Dujmovic, Matt Dunkman, Michael DuVernois, Emily Dvorak, Thomas Ehrhardt, Philipp Eller, Ralph Engel, Hannah Erpenbeck, John Evans, PA Evenson, Kwok Lung Fan, AR Fazely, Sebastian Fiedlschuster, Aaron Fienberg, Kirill Filimonov, Chad Finley, Leander Fischer, Derek B Fox, Anna Franckowiak, Elizabeth Friedman, Alexander Fritz, Philipp Furst, TK Gaisser, Jay Gallagher, Erik Ganster, Alfonso Garcia, Simone Garrappa, L Gerhardt, Ava Ghadimi, Christian Glaser, Theo Glauch, Thorsten Glusenkamp, A Goldschmidt, Javier Gonzalez, Sreetama Goswami, Darren Grant, Timothée Grégoire, Spencer Griswold, Mehmet Gunduz, Christoph Günther, Christian Haack, Allan Hallgren, R Halliday, L Halve, F Halzen, Martin Ha Minh, Kael Hanson, John Hardin, Alexander A Harnisch, Andreas Haungs, Simon Hauser, Dustin Hebecker, K Helbing, Felix Henningsen, Emma C Hettinger, Stephanie Hickford, Joshua Hignight, Colton Hill, GC Hill, Kara Hoffman, Ruth Hoffmann, Tobias Hoinka, Benjamin Hokanson-Fasig, K Hoshina, Feifei Huang, Matthias Huber, Thomas Huber, Klas Hultqvist, Mirco Hunnefeld, Raamis Hussain, Seongjin In, Nadège Iovine, Aya Ishihara, Matti Jansson, George Japaridze, Minjin Jeong, Ben Jones, Donghwa Kang, Woosik Kang, Xinyue Kang, Alexander Kappes, David Kappesser, Timo Karg, Martina Karl, A Karle, U Katz, M Kauer, Moritz Kellermann, JL Kelley, Ali Kheirandish, Ken'ichi Kin, Thomas Kintscher, Joanna Kiryluk, Spencer Klein, Ramesh Koirala, Hermann Kolanoski, Tomas Kontrimas, Lutz Kopke, Claudio Kopper, Sandro Kopper, DJ Koskinen, Paras Koundal, Michael Kovacevich, Marek Kowalski, Tetiana Kozynets, Emma Kun, Naoko Kurahashi Neilson, Neha Navnitkumar Lad, Cristina Lagunas Gualda, Justin Lanfranchi, Frederik Hermann Lauber, Jeffrey Lazar, Jiwoong Lee, Kayla Leonard, Agnieszka Leszczynska, Yijia Li, Massimiliano Lincetto, Qinrui Liu, Maria Liubarska, Elisa Lohfink, Cristian Jesus Lozano Mariscal, Lu Lu, Francesco Lucarelli, Andrew Ludwig, William Luszczak, Yang Lyu, Wing Yan Ma, James Madsen, Kendall Mahn, Yuya Makino, Sarah Mancina, Ioana Codrina Maris, Reina H Maruyama, K Mase, Thomas McElroy, Frank McNally, James Vincent Mead, K Meagher, Andres Medina, Maximilian Meier, Stephan Andrew Meighen-Berger, Jessie Micallef, Daniela Mockler, Teresa Montaruli, Roger Moore, R Morse, Marjon Moulai, Richard Naab, Ryo Nagai, Uwe Naumann, Jannis Necker, Le Viet Nguyen, Hans Niederhausen, Mehr Nisa, Sarah Nowicki, Dave Nygren, Anna Obertacke Pollmann, Marie Oehler, A Olivas, Erin O'Sullivan, Hershal Pandya, Daria Pankova, Nahee Park, Grant Parker, Ek Narayan Paudel, Larissa Paul, Carlos Perez de los Heros, Lilly Peters, Josh Peterson, Saskia Philippen, Damian Pieloth, Sarah Pieper, Martin Pittermann, A Pizzuto, M Plum, Yuiry Popovych, Alessio Porcelli, Maria Prado Rodriguez, P Buford Price, Brandom Pries, Gerald Przybylski, Christoph Raab, Amirreza Raissi, Mohamed Rameez, K Rawlins, Immacolata Carmen Rea, Abdul Rehman, Patrick Reichherzer, René Reimann, Giovanni Renzi, Elisa Resconi, Simeon Reusch, Wolfgang Rhode, Mike Richman, Benedikt Riedel, Ella Roberts, Sally Robertson, Gerrit Roellinghoff, Martin Rongen, Carsten Rott, Tim Ruhe, Dirk Ryckbosch, Devyn Rysewyk Cantu, Ibrahim Safa, Julian Saffer, Sebastian Sanchez Herrera, Alexander Sandrock, Joakim Sandroos, Marcos Santander, Subir Sarkar, Sourav Sarkar, Konstancja Satalecka, Maximilian Karl Scharf, Merlin Schaufel, Harald Schieler, Sebastian Schindler, P Schlunder, Torsten Schmidt, Austin Schneider, Judith Schneider, Frank Schröder, Lisa Johanna Schumacher, Georg Schwefer, Steve Sclafani, D Seckel, Surujhdeo Seunarine, Ankur Sharma, S Shefali, Manuel Silva, Barbara Skrzypek, Ben Smithers, Robert Snihur, Jan Soedingrekso, Dennis Soldin, Christian Spannfellner, Glenn Spiczak, Christian Spiering, Juliana Stachurska, Michael Stamatikos, Todor Stanev, Robert Stein, Joeran Stettner, A Steuer, T Stezelberger, Timo Sturwald, Thomas Stuttard, GW Sullivan, I Taboada, Frederik Tenholt, Samvel Ter-Antonyan, S Tilav, Franziska Tischbein, Kirsten Tollefson, Lenka Tomankova, Christoph Tönnis, Simona Toscano, Delia Tosi, Alexander Trettin, Maria Tselengidou, Chunfai Tung, Andrea Turcati, Roxanne Turcotte, Colin Turley, Jean Pierre Twagirayezu, Bunheng Ty, Martin Unland Elorrieta, Nora Valtonen-Mattila, Justin Vandenbroucke, Nick van Eijndhoven, David Vannerom, Jakob van Santen, Stef Verpoest, Matthias Vraeghe, C Walck, Timothyblake Watson, Chris Weaver, Philip Weigel, Andreas Weindl, Matthew Weiss, Jan Weldert, Chris Wendt, Johannes Werthebach, Mark Weyrauch, Nathan Whitehorn, CH Wiebusch, Dawn Williams, Martin Wolf, Kurt Woschnagg, Gerrit Wrede, Johan Wulff, Xianwu Xu, Yiqian Xu, Juan Pablo Yanez, S Yoshida, Shiqi Yu, Tianlu Yuan, Zelong Zhang
More details from the publisher
Details from ArXiV

Certification of incompatible measurements using quantum steering

ArXiv 2107.02937 (2021)

Authors:

Shubhayan Sarkar, Debashis Saha, Remigiusz Augusiak
Details from ArXiV

Do supernovae indicate an accelerating universe?

The European Physical Journal Special Topics Springer Science and Business Media LLC (2021)

Authors:

Roya Mohayaee, Mohamed Rameez, Subir Sarkar

Abstract:

AbstractIn the late 1990’s, observations of two directionally-skewed samples of, in total, 93 Type Ia supernovae were analysed in the framework of the Friedmann–Lemaître–Robertson–Walker (FLRW) cosmology. Assuming these to be ‘standard(isable) candles’ it was inferred that the Hubble expansion rate is accelerating as if driven by a positive Cosmological Constant $$\varLambda $$ Λ in Einstein’s theory of gravity. This is still the only direct evidence for the ‘dark energy’ that is the dominant component of today’s standard $$\varLambda $$ Λ CDM cosmological model. Other data such as baryon acoustic oscillations (BAO) in the large-scale distribution of galaxies, temperature fluctuations in the cosmic microwave background (CMB), measurement of stellar ages, the rate of growth of structure, etc are all ‘concordant’ with this model but do not provide independent evidence for accelerated expansion. The recent discussions about whether the inferred acceleration is real rests on analysis of a larger sample of 740 SNe Ia which shows that these are not quite standard candles, and more importantly highlights the ‘corrections’ that are applied to analyse the data in the FLRW framework. The latter holds in the reference frame in which the CMB is isotropic, whereas observations are carried out in our heliocentric frame in which the CMB has a large dipole anisotropy. This is assumed to be of kinematic origin i.e. due to our non-Hubble motion driven by local inhomogeneity in the matter distribution which has grown under gravity from primordial density perturbations traced by the CMB fluctuations. The $$\varLambda $$ Λ CDM model predicts how this peculiar velocity should fall off as the averaging scale is raised and the universe becomes sensibly homogeneous. However observations of the local ‘bulk flow’ are inconsistent with this expectation and convergence to the CMB frame is not seen. Moreover, the kinematic interpretation implies a corresponding dipole in the sky distribution of high redshift quasars, which is rejected by observations at $$4.9\sigma $$ 4.9 σ . Hence the peculiar velocity corrections employed in supernova cosmology are inconsistent and discontinuous within the data. The acceleration of the Hubble expansion rate is in fact anisotropic at $$3.9\sigma $$ 3.9 σ and aligned with the bulk flow. Thus dark energy could be an artefact of analysing data assuming that we are idealised observers in an FLRW universe, when in fact the real universe is inhomogeneous and anisotropic out to distances large enough to impact on cosmological analyses.
More details from the publisher
Details from ORA
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Details from ArXiV

Do supernovae indicate an accelerating universe?

(2021)

Authors:

Roya Mohayaee, Mohamed Rameez, Subir Sarkar
More details from the publisher

IceCube-Gen2: the window to the extreme Universe

IOP Publishing 48:6 (2021) 060501

Authors:

MG Aartsen, R Abbasi, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, C Alispach, P Allison, NM Amin, K Andeen, T Anderson, I Ansseau, G Anton, C Argüelles, TC Arlen, J Auffenberg, S Axani, H Bagherpour, X Bai, A Balagopal, A Barbano, I Bartos, B Bastian, V Basu, V Baum, S Baur, R Bay, JJ Beatty, K-H Becker, J Becker Tjus, S BenZvi, D Berley, E Bernardini, DZ Besson, G Binder, D Bindig, E Blaufuss, S Blot, C Bohm, M Bohmer, S Böser, O Botner, J Böttcher, E Bourbeau, J Bourbeau, F Bradascio, J Braun, S Bron, J Brostean-Kaiser, A Burgman, RT Burley, J Buscher, RS Busse, M Bustamante, MA Campana, EG Carnie-Bronca, T Carver, C Chen, P Chen, E Cheung, D Chirkin, S Choi, BA Clark, K Clark, L Classen, A Coleman, GH Collin, A Connolly, JM Conrad, P Coppin, P Correa, DF Cowen, R Cross, P Dave, C Deaconu, C De Clercq, JJ DeLaunay, S De Kockere, H Dembinski, K Deoskar, S De Ridder, A Desai, P Desiati, KD de Vries, G de Wasseige, M de With, T DeYoung, S Dharani, A Diaz, JC Díaz-Vélez, H Dujmovic, M Dunkman, MA DuVernois, E Dvorak, T Ehrhardt, P Eller, R Engel, JJ Evans, PA Evenson, S Fahey, K Farrag, AR Fazely, J Felde, AT Fienberg, K Filimonov, C Finley, L Fischer, D Fox, A Franckowiak, E Friedman, A Fritz, TK Gaisser, J Gallagher, E Ganster, D Garcia-Fernandez, S Garrappa, A Gartner, L Gerhard, R Gernhaeuser, A Ghadimi, C Glaser, T Glauch, T Glüsenkamp, A Goldschmidt, JG Gonzalez, S Goswami, D Grant, T Grégoire, Z Griffith, S Griswold, M Gündüz, C Haack, A Hallgren, R Halliday, L Halve, F Halzen, JC Hanson, K Hanson, J Hardin, J Haugen, A Haungs, S Hauser, D Hebecker, D Heinen, P Heix, K Helbing, R Hellauer, F Henningsen, S Hickford, J Hignight, C Hill, GC Hill, KD Hoffman, B Hoffmann, R Hoffmann, T Hoinka, B Hokanson-Fasig, K Holzapfel, K Hoshina, F Huang, M Huber, T Huber, T Huege, K Hughes, K Hultqvist, M Hünnefeld, R Hussain, S In, N Iovine, A Ishihara, M Jansson, GS Japaridze, M Jeong, BJP Jones, F Jonske, R Joppe, O Kalekin, D Kang, W Kang, X Kang, A Kappes, D Kappesser, T Karg, M Karl, A Karle, T Katori, U Katz, M Kauer, A Keivani, M Kellermann, JL Kelley, A Kheirandish, J Kim, K Kin, T Kintscher, J Kiryluk, T Kittler, M Kleifges, SR Klein, R Koirala, H Kolanoski, L Köpke, C Kopper, S Kopper, DJ Koskinen, P Koundal, M Kovacevich, M Kowalski, CB Krauss, K Krings, G Krückl, N Kulacz, N Kurahashi, C Lagunas Gualda, R Lahmann, JL Lanfranchi, MJ Larson, U Latif, F Lauber, JP Lazar, K Leonard, A Leszczyńska, Y Li, QR Liu, E Lohfink, J LoSecco, CJ Lozano Mariscal, L Lu, F Lucarelli, A Ludwig, J Lünemann, W Luszczak, Y Lyu, W Y, J Madsen, G Maggi, KBM Mahn, Y Makino, P Mallik, S Mancina, S Mandalia, IC Mariş, S Marka, Z Marka, R Maruyama, K Mase, R Maunu, F McNally, K Meagher, A Medina, M Meier, S Meighen-Berger, J Merz, ZS Meyers, J Micallef, D Mockler, G Momenté, T Montaruli, RW Moore, R Morse, M Moulai, P Muth, R Naab, R Nagai, J Nam, U Nauman, J Necker, G Neer, A Nelles, LV Nguyễn, H Niederhausen, MU Nisa, SC Nowicki, DR Nygren, E Oberla, A Obertacke Pollmann, M Oehler, A Olivas, E O’Sullivan, Y Pan, H Pandya, DV Pankova, L Papp, N Park, GK Parker, EN Paudel, P Peiffer, C Pérez de los Heros, TC Petersen, S Philippen, D Pieloth, S Pieper, JL Pinfold, A Pizzuto, I Plaisier, M Plum, Y Popovych, A Porcelli, M Prado Rodriguez, PB Price, GT Przybylski, C Raab, A Raissi, M Rameez, L Rauch, K Rawlins, IC Rea, A Rehman, R Reimann, M Renschler, G Renzi, E Resconi, S Reusch, W Rhode, M Richman, B Riedel, M Riegel, EJ Roberts, S Robertson, G Roellinghoff, M Rongen, C Rott, T Ruhe, D Ryckbosch, D Rysewyk Cantu, I Safa, SE Sanchez Herrera, A Sandrock, J Sandroos, P Sandstrom, M Santander, S Sarkar, S Sarkar, K Satalecka, M Scharf, M Schaufel, H Schieler, P Schlunder, T Schmidt, A Schneider, J Schneider, FG Schröder, L Schumacher, S Sclafani, D Seckel, S Seunarine, MH Shaevitz, A Sharma, S Shefali, M Silva, D Smith, B Smithers, R Snihur, J Soedingrekso, D Soldin, S Söldner-Rembold, M Song, D Southall, GM Spiczak, C Spiering, J Stachurska, M Stamatikos, T Stanev, R Stein, J Stettner, A Steuer, T Stezelberger, RG Stokstad, NL Strotjohann, T Stürwald, T Stuttard, GW Sullivan, I Taboada, A Taketa, HKM Tanaka, F Tenholt, S Ter-Antonyan, A Terliuk, S Tilav, K Tollefson, L Tomankova, C Tönnis, J Torres, S Toscano, D Tosi, A Trettin, M Tselengidou, CF Tung, A Turcati, R Turcotte, CF Turley, JP Twagirayezu, B Ty, E Unger, MA Unland Elorrieta, J Vandenbroucke, D van Eijk, N van Eijndhoven, D Vannerom, J van Santen, D Veberic, S Verpoest, A Vieregg, M Vraeghe, C Walck, TB Watson, C Weaver, A Weindl, L Weinstock, MJ Weiss, J Weldert, C Welling, C Wendt, J Werthebach, N Whitehorn, K Wiebe, CH Wiebusch, DR Williams, SA Wissel, M Wolf, TR Wood, K Woschnagg, G Wrede, S Wren, J Wulff, XW Xu, Y Xu, JP Yanez, S Yoshida, T Yuan, Z Zhang, S Zierke, M Zöcklein
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