Imperial College London

DrRobertoTrotta

Faculty of Natural SciencesDepartment of Physics

Reader in Astrophysics, CLCC Director
 
 
 
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Contact

 

+44 (0)20 7594 7793r.trotta Website CV

 
 
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Assistant

 

Mrs Sheila Ekudo +44 (0)20 7594 2086

 
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Location

 

1009Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

85 results found

Hill R, Shariff H, Trotta R, Ali-Khan S, Jiao X, Liu Y, Moon SK, Parker W, Paulus M, Dyk DAV, Lucy LBet al., 2018, Projected distances to host galaxy reduce SNIa dispersion, Monthly Notices of the Royal Astronomical Society, Vol: 481, Pages: 2766-2777, ISSN: 0035-8711

We use multi-band imagery data from the Sloan Digital Sky Survey (SDSS) to measure projected distances of 302 supernova type Ia (SNIa) from the centre of their host galaxies, normalized to the galaxy's brightness scale length, with a Bayesian approach. We test the hypothesis that SNIas further away from the centre of their host galaxy are less subject to dust contamination (as the dust column density in their environment is maller) and/or come from a more homogeneous environment. Using the Mann-Whitney U test, we find a statistically significant difference in the observed colour correction distribution between SNIas that are near and those that are far from the centre of their host. The local p-value is 3 x 10^{-3}, which is significant at the 5 per cent level after look-elsewhere effect correction. We estimate the residual scatter of thetwo subgroups to be 0.073 +/- 0.018 for the far SNIas, compared to 0.114 +/-0.009 for the near SNIas -- an improvement of 30 per cent, albeit with a low statistical significance of 2sigma. This confirms the importance of host galaxy properties in correctly interpreting SNIa observations for cosmological inference.

JOURNAL ARTICLE

Clark HA, Scott P, Trotta R, Lewis GFet al., 2018, Dark matter substructure cannot explain properties of the Fermi Galactic Centre excess, Journal of Cosmology and Astroparticle Physics, Vol: 2018, ISSN: 1475-7516

An excess of gamma rays has been identified at the centre of the Milky Way, and annihilation of dark matter has been posited as a potential source. This hypothesis faces significant challenges: difficulty characterizing astrophysical backgrounds, the need for a non-trivial adiabatic contraction of the inner part of the Milky Way's dark matter halo, and recent observations of photon clustering, which suggest that the majority of the excess is due to unresolved point sources. Here we point out that the apparent point-like nature of the emission rules out the dark matter interpretation of the excess entirely. Attempting to model the emission with dark matter point sources either worsens the problem with the inner slope, requires an unrealistically large minihalo fraction toward the Galactic Centre, or overproduces the observed emission at higher latitudes.

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Amendola L, Appleby S, Avgoustidis A, Bacon D, Baker T, Baldi M, Bartolo N, Blanchard A, Bonvin C, Borgani S, Branchini E, Burrage C, Camera S, Carbone C, Casarini L, Cropper M, de Rham C, Dietrich JP, Di Porto C, Durrer R, Ealet A, Ferreira PG, Finelli F, Garcia-Bellido J, Giannantonio T, Guzzo L, Heavens A, Heisenberg L, Heymans C, Hoekstra H, Hollenstein L, Holmes R, Hwang Z, Jahnke K, Kitching TD, Koivisto T, Kunz M, La Vacca G, Linder E, March M, Marra V, Martins C, Majerotto E, Markovic D, Marsh D, Marulli F, Massey R, Mellier Y, Montanari F, Mota DF, Nunes NJ, Percival W, Pettorino V, Porciani C, Quercellini C, Read J, Rinaldi M, Sapone D, Sawicki I, Scaramella R, Skordis C, Simpson F, Taylor A, Thomas S, Trotta R, Verde L, Vernizzi F, Vollmer A, Wang Y, Weller J, Zlosnik Tet al., 2018, Cosmology and fundamental physics with the Euclid satellite, LIVING REVIEWS IN RELATIVITY, Vol: 21, Pages: 1-345, ISSN: 1433-8351

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Trotta R, 2018, The Hands-On Universe: Making Sense of the Universe with All Your Senses, CAPJOURNAL, Pages: 20-25, ISSN: 1996-5621

For the past four years, the Hands-On Universe public engagement programme has explored unconventional, interactive and multi-sensorial ways of communicating complex ideas in cosmology and astrophysics to a wide variety of audiences. The programme lead, Roberto Trotta, has reached thousands of people through food-based workshops, art and science collaborations and a book written using only the 1000 most common words in the English language. In this article, Roberto reflects in first person on what has worked well in the programme, and what has not.

JOURNAL ARTICLE

Revsbech EA, Trotta R, van Dyk DA, 2018, STACCATO: a novel solution to supernova photometric classification with biased training sets, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 473, Pages: 3969-3986, ISSN: 0035-8711

JOURNAL ARTICLE

Oreshenko M, Lavie B, Grimm SL, Tsai S-M, Malik M, Demory B-O, Mordasini C, Alibert Y, Benz W, Quanz SP, Trotta R, Heng Ket al., 2017, Retrieval analysis of the emission spectrum of WASP-12b: sensitivity of outcomes to prior assumptions and implications for formation history, Astrophysical Journal Letters, Vol: 847, ISSN: 2041-8205

We analyze the emission spectrum of the hot Jupiter WASP-12b using our HELIOS-R retrieval code and HELIOS-K opacity calculator. When interpreting Hubble and Spitzer data, the retrieval outcomes are found to be prior-dominated. When the prior distributions of the molecular abundances are assumed to be log-uniform, the volume mixing ratio of HCN is found to be implausibly high. A VULCAN chemical kinetics model of WASP-12b suggests that chemical equilibrium is a reasonable assumption even when atmospheric mixing is implausibly rigorous. Guided by (exo)planet formation theory, we set Gaussian priors on the elemental abundances of carbon, oxygen, and nitrogen with the Gaussian peaks being centered on the measured C/H, O/H, and N/H values of the star. By enforcing chemical equilibrium, we find substellar O/H and stellar to slightly superstellar C/H for the dayside atmosphere of WASP-12b. The superstellar carbon-to-oxygen ratio is just above unity, regardless of whether clouds are included in the retrieval analysis, consistent with Madhusudhan et al. Furthermore, whether a temperature inversion exists in the atmosphere depends on one's assumption for the Gaussian width of the priors. Our retrieved posterior distributions are consistent with the formation of WASP-12b in a solar-composition protoplanetary disk, beyond the water iceline, via gravitational instability or pebble accretion (without core erosion) and migration inward to its present orbital location via a disk-free mechanism, and are inconsistent with both in situ formation and core accretion with disk migration, as predicted by Madhusudhan et al. We predict that the interpretation of James Webb Space Telescope WASP-12b data will not be prior-dominated.

JOURNAL ARTICLE

Shariff H, Dhawan S, Jiao X, Leibundgut B, Trotta R, van Dyk DAet al., 2016, Standardizing Type Ia supernovae optical brightness using near-infrared rebrightening time, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 463, Pages: 4311-4316, ISSN: 0035-8711

JOURNAL ARTICLE

Aalbers J, Agostini F, Alfonsi M, Amaro FD, Amsler C, Aprile E, Arazi L, Arneodo F, Barrow P, Baudis L, Benabderrahmane ML, Berger T, Beskers B, Breskin A, Breur PA, Brown A, Brown E, Bruenner S, Bruno G, Budnik R, Butikofer L, Calven J, Cardoso JMR, Cichon D, Coderre D, Colijn AP, Conrad J, Cussonneau JP, Decowski MP, Diglio S, Drexlin G, Duchovni E, Erdal E, Eurin G, Ferella A, Fieguth A, Fulgione W, Rosso AG, Di Gangi P, Di Giovanni A, Galloway M, Garbini M, Geis C, Glueck F, Grandi L, Greene Z, Grignon C, Hasterok C, Hannen V, Hogenbirk E, Howlett J, Hilk D, Hils C, James A, Kaminsky B, Kazama S, Kilminster B, Kish A, Krauss LM, Landsman H, Lang RF, Lin Q, Linde FL, Lindemann S, Lindner M, Lopes JAM, Undagoitia TM, Masbou J, Massoli FV, Mayani D, Messina M, Micheneau K, Molinario A, Mora KD, Morteau E, Murra M, Naganoma J, Newstead JL, Ni K, Oberlack U, Pakarha P, Pelssers B, de Perio P, Persiani R, Piastra F, Piro MC, Plante G, Rauch L, Reichard S, Rizzo A, Rupp N, Dos Santos JMF, Sartorelli G, Scheibelhut M, Schindler S, Schumann M, Schreiner J, Lavina LS, Selvi M, Shagin P, Silva MC, Simgen H, Sissol P, von Sivers M, Thers D, Thum J, Tiseni A, Trotta R, Tunnell CD, Valerius K, Vargas MA, Wang H, Wei Y, Weinheimer C, Wester T, Wulf J, Zhang Y, Zhu T, Zuber Ket al., 2016, DARWIN: towards the ultimate dark matter detector, Journal of Cosmology and Astroparticle Physics, Vol: 2016, ISSN: 1475-7516

DARk matter WImp search with liquid xenoN (DARWIN) will be an experiment for the direct detection of dark matter using a multi-ton liquid xenon time projection chamber at its core. Its primary goal will be to explore the experimentally accessible parameter space for Weakly Interacting Massive Particles (WIMPs) in a wide mass-range, until neutrino interactions with the target become an irreducible background. The prompt scintillation light and the charge signals induced by particle interactions in the xenon will be observed by VUV sensitive, ultra-low background photosensors. Besides its excellent sensitivity to WIMPs above a mass of 5 GeV/c2, such a detector with its large mass, low-energy threshold and ultra-low background level will also be sensitive to other rare interactions. It will search for solar axions, galactic axion-like particles and the neutrinoless double-beta decay of 136Xe, as well as measure the low-energy solar neutrino flux with < 1% precision, observe coherent neutrino-nucleus interactions, and detect galactic supernovae. We present the concept of the DARWIN detector and discuss its physics reach, the main sources of backgrounds and the ongoing detector design and R&D efforts.

JOURNAL ARTICLE

Aaboud M, Aad G, Abbott B, Abdallah J, Abdinov O, Abeloos B, Aben R, AbouZeid OS, Abraham NL, Abramowicz H, Abreu H, Abreu R, Abulaiti Y, Acharya BS, Adachi S, Adamczyk L, Adams DL, Adelman J, Adomeit S, Adye T, Affolder AA, Agatonovic-Jovin T, Aguilar-Saavedra JA, Ahlen SP, Ahmadov F, Aielli G, Akerstedt H, Akesson TPA, Akimov AV, Alberghi GL, Albert J, Albrand S, Alconada Verzini MJ, Aleksa M, Aleksandrov IN, Alexa C, Alexander G, Alexopoulos T, Alhroob M, Ali B, Aliev M, Alimonti G, Alison J, Alkire SP, Allbrooke BMM, Allen BW, Allport PP, Aloisio A, Alonso A, Alonso F, Alpigiani C, Alshehri AA, Alstaty M, Gonzalez BA, Alvarez Piqueras D, Alviggi MG, Amadio BT, Amako K, Amaral Coutinho Y, Amelung C, Amidei D, Dos Santos SPA, Amorim A, Amoroso S, Amundsen G, Anastopoulos C, Ancu LS, Andari N, Andeen T, Anders CF, Anders G, Anders JK, Anderson KJ, Andreazza A, Andrei V, Angelidakis S, Angelozzi I, Angerami A, Anghinolfi F, Anisenkov AV, Anjos N, Annovi A, Antel C, Antonelli M, Antonov A, Anulli F, Aoki M, Bella LA, Arabidze G, Arai Y, Araque JP, Arce ATH, Arduh FA, Arguin J-F, Argyropoulos S, Arik M, Armbruster AJ, Armitage LJ, Arnaez O, Arnold H, Arratia M, Arslan O, Artamonov A, Artoni G, Artz S, Asai S, Asbah N, Ashkenazi A, Asman B, Asquith L, Assamagan K, Astalos R, Atkinson M, Atlay NB, Augsten K, Avolio G, Axen B, Ayoub MK, Azuelos G, Baak MA, Baas AE, Baca MJ, Bachacou H, Bachas K, Backes M, Backhaus M, Bagiacchi P, Bagnaia P, Bai Y, Baines JT, Baker OK, Baldin EM, Balek P, Balestri T, Balli F, Balunas WK, Banas E, Banerjee S, Bannoura AAE, Barak L, Barberio EL, Barberis D, Barbero M, Barillari T, Barisits M-S, Barklow T, Barlow N, Barnes SL, Barnett BM, Barnett RM, Barnovska-Blenessy Z, Baroncelli A, Barone G, Barr AJ, Barranco Navarro L, Barreiro F, da Costa JBG, Bartoldus R, Barton AE, Bartos P, Basalaev A, Bassalat A, Bates RL, Batista SJ, Batley JR, Battaglia M, Bauce M, Bauer F, Bawa HS, Beacham JB, Beattie MD, Beau T, Beauchemin PH, Bechtle P, Beck Het al., 2016, Dark matter interpretations of ATLAS searches for the electroweak production of supersymmetric particles in root s=8 TeV proton-proton collisions, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

JOURNAL ARTICLE

Liem S, Bertone G, Calore F, Ruiz de Austri R, Tait TMP, Trotta R, Weniger Cet al., 2016, Effective field theory of dark matter: a global analysis, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

JOURNAL ARTICLE

Shariff H, Jiao X, Trotta R, van Dyk DAet al., 2016, BAHAMAS: NEW ANALYSIS OF TYPE Ia SUPERNOVAE REVEALS INCONSISTENCIES WITH STANDARD COSMOLOGY, ASTROPHYSICAL JOURNAL, Vol: 827, ISSN: 0004-637X

JOURNAL ARTICLE

Johannesson G, de Austri RR, Vincent AC, Moskalenko IV, Orlando E, Porter TA, Strong AW, Trotta R, Feroz F, Graff P, Hobson MPet al., 2016, BAYESIAN ANALYSIS OF COSMIC RAY PROPAGATION: EVIDENCE AGAINST HOMOGENEOUS DIFFUSION, ASTROPHYSICAL JOURNAL, Vol: 824, ISSN: 0004-637X

JOURNAL ARTICLE

Bertone G, Calore F, Caron S, Ruiz R, Kim JS, Trotta R, Weniger Cet al., 2016, Global analysis of the pMSSM in light of the Fermi GeV excess: prospects for the LHC Run-II and astroparticle experiments, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516

JOURNAL ARTICLE

Strege C, Bertone G, Besjes GJ, Caron S, Ruiz de Austri R, Strubig A, Trotta Ret al., 2014, Profile likelihood maps of a 15-dimensional MSSM, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479

JOURNAL ARTICLE

Martin J, Ringeval C, Trotta R, Vennin Vet al., 2014, Compatibility of Planck and BICEP2 results in light of inflation, PHYSICAL REVIEW D, Vol: 90, ISSN: 2470-0010

JOURNAL ARTICLE

Martin J, Ringeval C, Trotta R, Vennin Vet al., 2014, The best inflationary models after Planck, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516

JOURNAL ARTICLE

Strege C, Bertone G, Feroz F, Fornasa M, Ruiz de Austri R, Trotta Ret al., 2013, Global fits of the cMSSM and NUHM including the LHC Higgs discovery and new XENON100 constraints, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516

JOURNAL ARTICLE

Pato M, Strigari LE, Trotta R, Bertone Get al., 2013, Taming astrophysical bias in direct dark matter searches, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516

JOURNAL ARTICLE

Amendola L, Appleby S, Bacon D, Baker T, Baldi M, Bartolo N, Blanchard A, Bonvin C, Borgani S, Branchini E, Burrage C, Camera S, Carbone C, Casarini L, Cropper M, de Rham C, Di Porto C, Ealet A, Ferreira PG, Finelli F, Garcia-Bellido J, Giannantonio T, Guzzo L, Heavens A, Heisenberg L, Heymans C, Hoekstra H, Hollenstein L, Holmes R, Horst O, Jahnke K, Kitching TD, Koivisto T, Kunz M, La Vacca G, March M, Majerotto E, Markovic K, Marsh D, Marulli F, Massey R, Mellier Y, Mota DF, Nunes NJ, Percival W, Pettorino V, Porciani C, Quercellini C, Read J, Rinaldi M, Sapone D, Scaramella R, Skordis C, Simpson F, Taylor A, Thomas S, Trotta R, Verde L, Vernizzi F, Vollmer A, Wang Y, Weller J, Zlosnik Tet al., 2013, Cosmology and Fundamental Physics with the Euclid Satellite, LIVING REVIEWS IN RELATIVITY, Vol: 16, ISSN: 1433-8351

JOURNAL ARTICLE

Gandy A, Trotta R, 2013, Special Issue on Astrostatistics, STATISTICAL ANALYSIS AND DATA MINING, Vol: 6, Pages: 1-+, ISSN: 1932-1864

JOURNAL ARTICLE

Strege C, Trotta R, Bertone G, Peter AHG, Scott Pet al., 2012, Fundamental statistical limitations of future dark matter direct detection experiments, PHYSICAL REVIEW D, Vol: 86, ISSN: 2470-0010

JOURNAL ARTICLE

Bertone G, Cerdeno DG, Fornasa M, Pieri L, Ruiz de Austri R, Trotta Ret al., 2012, Complementarity of indirect and accelerator dark matter searches, PHYSICAL REVIEW D, Vol: 85, ISSN: 1550-7998

JOURNAL ARTICLE

Arina C, Hamann J, Trotta R, Wong YYYet al., 2012, Evidence for dark matter modulation in CoGeNT?, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516

JOURNAL ARTICLE

Strege C, Bertone G, Cerdeno DG, Fornasa M, Ruiz de Austri R, Trotta Ret al., 2012, Updated global fits of the cMSSM including the latest LHC SUSY and Higgs searches and XENON100 data, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516

JOURNAL ARTICLE

Bertone G, Cerdeno DG, Fornasa M, Ruiz de Austri R, Strege C, Trotta Ret al., 2012, Global fits of the cMSSM including the first LHC and XENON100 data, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516

JOURNAL ARTICLE

Bertone G, Cumberbatch D, Ruiz de Austri R, Trotta Ret al., 2012, Dark Matter searches: the nightmare scenario, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516

JOURNAL ARTICLE

March MC, Trotta R, Berkes P, Starkman GD, Vaudrevange PMet al., 2011, Improved constraints on cosmological parameters from Type Ia supernova data, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 418, Pages: 2308-2329, ISSN: 0035-8711

JOURNAL ARTICLE

Eugenia Cabrera M, Alberto Casas J, Ruiz de Austri R, Trotta Ret al., 2011, Quantifying the tension between the Higgs mass and (g-2)(mu) in the constrained MSSM, PHYSICAL REVIEW D, Vol: 84, ISSN: 2470-0010

JOURNAL ARTICLE

March MC, Trotta R, Amendola L, Huterer Det al., 2011, Robustness to systematics for future dark energy probes, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 415, Pages: 143-152, ISSN: 0035-8711

JOURNAL ARTICLE

Trotta R, Kunz M, Liddle AR, 2011, Designing decisive detections, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 414, Pages: 2337-2344, ISSN: 0035-8711

JOURNAL ARTICLE

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