Prof Subir Sarkar: Publications

IceCube

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

Racetrack inflation and assisted moduli stabilisation

Nuclear Physics B 766:1-3 (2007) 1-20

Authors:

Z Lalak, GG Ross, S Sarkar

Abstract:

We present a model of inflation based on a racetrack model without flux stabilization. The initial conditions are set automatically through topological inflation. This ensures that the dilaton is not swept to weak coupling through either thermal effects or fast roll. Including the effect of non-dilaton fields we find that moduli provide natural candidates for the inflaton. The resulting potential generates slow-roll inflation without the need to fine-tune parameters. The energy scale of inflation must be near the GUT scale and the scalar density perturbation generated has a spectrum consistent with WMAP data. © 2006.

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High-energy neutrinos from astrophysical accelerators of cosmic ray nuclei

(2007)

Authors:

Luis A Anchordoqui, Dan Hooper, Subir Sarkar, Andrew M Taylor

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An upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory

Astroparticle Physics 27:2-3 (2007) 155-168

Authors:

J Abraham, M Aglietta, C Aguirre, D Allard, I Allekotte, P Allison, C Alvarez, J Alvarez-Muñiz, M Ambrosio, L Anchordoqui, JC Anjos, C Aramo, K Arisaka, E Armengaud, F Arneodo, F Arqueros, T Asch, H Asorey, BS Atulugama, J Aublin, M Ave, G Avila, J Bacelar, T Bäcker, D Badagnani, AF Barbosa, HMJ Barbosa, M Barkhausen, D Barnhill, SLC Barroso, P Bauleo, J Beatty, T Beau, BR Becker, KH Becker, JA Bellido, S BenZvi, C Berat, T Bergmann, P Bernardini, X Bertou, PL Biermann, P Billoir, O Blanch-Bigas, F Blanco, P Blasi, C Bleve, H Blümer, P Boghrat, M Boháčová, C Bonifazi, R Bonino, M Boratav, J Brack, JM Brunet, P Buchholz, NG Busca, KS Caballero-Mora, B Cai, DV Camin, JN Capdevielle, R Caruso, A Castellina, G Cataldi, L Cazón, R Cester, J Chauvin, A Chiavassa, JA Chinellato, A Chou, J Chye, D Claes, PDJ Clark, RW Clay, SB Clay, B Connolly, A Cordier, U Cotti, S Coutu, CE Covault, J Cronin, S Dagoret-Campagne, T Dang Quang, P Darriulat, K Daumiller, BR Dawson, RM de Almeida, LA de Carvalho, C De Donato, SJ de Jong, WJM de Mello, JRT de Mello Neto, I De Mitri, MAL de Oliveira, V de Souza, L del Peral, O Deligny, A Della Selva, C Delle Fratte, H Dembinski

Abstract:

An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than 10¹⁹ eV, based on observations of the depth of shower maximum performed with the hybrid detector of the Pierre Auger Observatory. This is the first such limit on photons obtained by observing the fluorescence light profile of air showers. This upper limit confirms and improves on previous results from the Haverah Park and AGASA surface arrays. Additional data recorded with the Auger surface detectors for a subset of the event sample support the conclusion that a photon origin of the observed events is not favored. © 2006 Elsevier B.V. All rights reserved.

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Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

Astroparticle Physics 27:4 (2007) 244-253

Authors:

J Abraham, M Aglietta, C Aguirre, D Allard, I Allekotte, P Allison, C Alvarez, J Alvarez-Muñiz, M Ambrosio, L Anchordoqui, JC Anjos, C Aramo, K Arisaka, E Armengaud, F Arneodo, F Arqueros, T Asch, H Asorey, BS Atulugama, J Aublin, M Ave, G Avila, J Bacelar, T Bäcker, D Badagnani, AF Barbosa, HMJ Barbosa, M Barkhausen, D Barnhill, SLC Barroso, P Bauleo, J Beatty, T Beau, BR Becker, KH Becker, JA Bellido, S BenZvi, C Berat, T Bergmann, P Bernardini, X Bertou, PL Biermann, P Billoir, O Blanch-Bigas, F Blanco, P Blasi, C Bleve, H Blümer, P Boghrat, M Boháčová, C Bonifazi, R Bonino, M Boratav, J Brack, JM Brunet, P Buchholz, NG Busca, KS Caballero-Mora, B Cai, DV Camin, JN Capdevielle, R Caruso, A Castellina, G Cataldi, L Cazón, R Cester, J Chauvin, A Chiavassa, JA Chinellato, A Chou, J Chye, D Claes, PDJ Clark, RW Clay, SB Clay, B Connolly, A Cordier, U Cotti, S Coutu, CE Covault, J Cronin, S Dagoret-Campagne, TD Quang, P Darriulat, K Daumiller, BR Dawson, RM de Almeida, LA de Carvalho, C De Donato, SJ de Jong, WJM de Mello, JRT de Mello Neto, I De Mitri, MAL de Oliveira, V de Souza, L del Peral, O Deligny, AD Selva, CD Fratte, H Dembinski

Abstract:

Data from the Pierre Auger Observatory are analyzed to search for anisotropies near the direction of the Galactic Centre at EeV energies. The exposure of the surface array in this part of the sky is already significantly larger than that of the fore-runner experiments. Our results do not support previous findings of localized excesses in the AGASA and SUGAR data. We set an upper bound on a point-like flux of cosmic rays arriving from the Galactic Centre which excludes several scenarios predicting sources of EeV neutrons from Sagittarius A. Also the events detected simultaneously by the surface and fluorescence detectors (the 'hybrid' data set), which have better pointing accuracy but are less numerous than those of the surface array alone, do not show any significant localized excess from this direction. © 2006 Elsevier B.V. All rights reserved.

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Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

ASTROPARTICLE PHYSICS 27:4 (2007) 244-253

Authors:

J Abraham, M Aglietta, C Aguirre, D Allard, I Allekotte, P Allison, C Alvarez, J Alvarez-Muniz, M Ambrosio, L Anchordoqui, JC Anjos, C Aramo, K Arisaka, E Armengaud, F Arneodo, F Arqueros, T Asch, H Asorey, BS Atulugama, J Aublin, M Ave, G Avila, J Bacelar, T Baecker, D Badagnani, AF Barbosa, HMJ Barbosa, M Barkhausen, D Barnhill, SLC Barroso, P Bauleo, J Beatty, T Beau, BR Becker, KH Becker, JA Bellido, S BenZvi, C Berat, T Bergmann, P Bernardini, X Bertou, PL Biermann, P Billoir, O Blanch-Bigas, F Blanco, P Blasi, C Bleve, H Bluemer, P Boghrat, M Bohacova, C Bonifazi, R Bonino, M Boratav, J Brack, JM Brunet, P Buchholz, NG Busca, KS Caballero-Mora, B Cai, DV Camin, JN Capdevielle, R Caruso, A Castellina, G Cataldi, L Cazon, R Cester, J Chauvin, A Chiavassa, JA Chinellato, A Chou, J Chye, D Claes, PDJ Clark, RW Clay, SB Clay, B Connolly, A Cordier, U Cotti, S Coutu, CE Covault, J Cronin, S Dagoret-Campagne, T Dang Quang, P Darriulat, K Daumiller, BR Dawson, RM de Almeida, LA de Carvalho, C De Donato, SJ de Jong, WJM de Mello Junior, JRT de Mello Neto, I De Mitri, MAL de Oliveira, V de Souza, L del Peral, O Deligny, A Della Selva, C Delle Fratte, H Dembinski, C Di Giulio, JC Diaz, C Dobrigkeit, JC D'Olivo, D Dornic, A Dorofeev, MT Dova, D D'Urso, MA DuVernois, R Engel, L Epele, M Erdmann, CO Escobar, A Etchegoyen, A Ewers, P Facal San Luis, H Falcke, AC Fauth, D Fazio, N Fazzini, A Fernandez, F Ferrer, S Ferry, B Fick, A Filevich, A Filipcic, I Fleck, E Fokitis, R Fonte, D Fuhrmann, W Fulgione, B Garcia, D Garcia-Pinto, L Garrard, X Garrido, H Geenen, G Gelmini, H Gemmeke, A Geranios, PL Ghia, M Giller, J Gitto, H Glass, F Gobbi, MS Gold, F Gomez Albarracin, M Gomez Berisso, R Gomez Herrero, M Goncalves do Amaral, JP Gongora, D Gonzalez, JG Gonzalez, M Gonzalez, D Gora, A Gorgi, P Gouffon, V Grassi, A Grillo, C Grunfeld, C Grupen, F Guarino, GP Guedes, J Gutierrez, JD Hague, JC Hamilton, MN Harakeh, D Hararl, S Harmsma, S Hartmann, JL Harton, A Haungs, MD Healy, T Hebbeker, D Heck, C Hojvat, P Homola, J Hoerandel, A Horneffer, M Horvat, M Hrabovsky, T Huege, M Iarlori, A Insolia, M Kaducak, O Kalashev, KH Kampert, B Keilhauer, E Kemp, HO Klages, M Kleifges, J Kleinfeller, R Knapik, J Knapp, D-H Koang, Y Kolotaev, A Kopmann, O Kroemer, S Kuhlman, J Kuijpers, N Kunka, A Kusenko, C Lachaud, BL Lago, D Lebrun, P LeBrun, J Lee, A Letessier-Selvon, M Leuthold, I Lhenry-Yvon, G Longo, R Lopez, A Lopez Aguera, A Lucero, S Maldera, M Malek, S Maltezos, G Mancarella, ME Mancenido, D Mandat, P Mantsch, AG Mariazzi, IC Maris, D Martello, N Martinez, J Martinez, O Martínez, HJ Mathes, J Matthews, JAJ Matthews, G Matthiae, G Maurin, D Maurizio, PO Mazur, T McCauley, M McEwen, RR McNeil, G Medina, MC Medina, R Meyhandan, MI Micheletti, G Miele, W Miller, S Mollerach, M Monasor, D Monnier Ragaigne, F Montanet, B Morales, C Morello, E Moreno, C Morris, M Mostafa, MA Muller, R Mussa, G Navarra, L Nellen, C Newman-Holmes, D Newton, T Nguyen Thi, R Nichol, N Nierstenhoefer, D Nitz, H Nogima, D Nosek, L Nozka, J Oehlschlaeger, T Ohnuki, A Olinto, LFA Oliveira, VM Olmos-Gilbaja, M Ortiz, S Ostapchenko, L Otero, M Palatka, J Pallotta, G Parente, E Parizot, S Parlati, M Patel, T Paul, K Payet, M Pech, J Pekala, R Pelayo, IM Pepe, L Perrone, S Petrera, P Petrinca, Y Petrov, D Pham Ngoc, TN Pham Thi, R Piegaia, T Pierog, O Pisanti, TA Porter, J Pouryamout, L Prado Junior, P Privitera, M Prouza, EJ Quel, J Rautenberg, HC Reis, S Reucroft, B Revenu, J Ridky, A Risi, M Risse, C Riviere, V Rizi, S Robbins, M Roberts, C Robledo, G Rodriguez, D Rodriguez Frias, J Rodriguez Martino, J Rodriguez Rojo, G Ros, J Rosado, M Roth, C Roucelle, B Rouille-d'Orfeuil, E Roulet, AC Rovero, F Salamida, H Salazar, G Salina, F Sanchez, M Santander, EM Santos, S Sarkar, R Sato, V Scherini, H Schieler, T Schmidt, O Scholten, P Schovanek, F Schuessler, SJ Sciutto, M Scuderi, D Semikoz, G Sequeiros, RC Shellard, BB Siffert, G Sigl, P Skelton, W Slater, N Smetniansky De Grande, A Smialkowski, R Smida, BE Smith, GR Snow, P Sokolsk, P Sommers, J Sorokin, H Spinka, E Strazzeri, A Stutz, F Suarez, T Suomijarvi, AD Supanitsky, J Swain, Z Szadkowski, A Tamashiro, A Tamburro, O Tascau, R Ticona, C Timmermans, W Tkaczyk, CJ Todero Peixoto, A Tonachini, D Torresi, P Travnicek, A Tripathi, G Tristram, D Tscherniakhovski, M Tueros, V Tunnicliffe, R Ulrich, M Unger, M Urban, JF Valdes Galicia, I Valino, L Valore, AM van den Berg, V van Elewyck, RA Vazquez, D Veberic, A Veiga, A Velarde, T Venters, V Verzi, M Videla, L Villasenor, T Vo Van, S Vorobiov, L Voyvodic, H Wahlberg, O Wainberg, T Waldenmaier, P Walker, D Warner, AA Watson, S Westerhoff, C Wiebusch, G Wieczorek, L Wiencke, B Wilczynska, H Wilczynski, C Wileman, MG Winnick, J Xu, T Yamamoto, P Younk, E Zas, D Zavrtanik, M Zavrtanik, A Zech, A Zepeda, M Zha, M Ziolkowski

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Prof Subir Sarkar

Research theme

Sub department

IceCube

IceCube at Oxford

Racetrack inflation and assisted moduli stabilisation

Authors:

Abstract:

High-energy neutrinos from astrophysical accelerators of cosmic ray nuclei

Authors:

An upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory

Authors:

Abstract:

Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

Authors:

Abstract:

Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

Authors:

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Prof Subir Sarkar

Research theme

Sub department

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IceCube

IceCube at Oxford

Racetrack inflation and assisted moduli stabilisation

Authors:

Abstract:

High-energy neutrinos from astrophysical accelerators of cosmic ray nuclei

Authors:

An upper limit to the photon fraction in cosmic rays above 1019 eV from the Pierre Auger Observatory

Authors:

Abstract:

Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

Authors:

Abstract:

Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory

Authors: