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Author |
Caroca, R.; Kondrashuk, I.; Merino, N.; Nadal, F. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Bianchi spaces and their three-dimensional isometries as S-expansions of two-dimensional isometries |
Type |
Journal Article |
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Year |
2013 |
Publication |
Journal of Physics A |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
J. Phys. A |
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Volume |
46 |
Issue |
22 |
Pages |
225201 - 24pp |
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Abstract |
In this paper we show that certain three-dimensional isometry algebras, specifically those of type I, II, III and V (according to Bianchi's classification), can be obtained as expansions of the isometries in two dimensions. In particular, we use the so-called S-expansionmethod, which makes use of the finite Abelian semigroups, because it is the most general procedure known until now. Also, it is explicitly shown why it is impossible to obtain the algebras of type IV, VI-IX as expansions from the isometry algebras in two dimensions. All the results are checked with computer programs. This procedure shows that the problem of how to relate, by an expansion, two Lie algebras of different dimensions can be entirely solved. In particular, the procedure can be generalized to higher dimensions, which could be useful for diverse physical applications, as we discuss in our conclusions. |
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Address |
Univ Catolica Santisima, Dept Matemat & Fis Aplicadas, Concepcion, Chile, Email: nelson.merino@ucv.cl |
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Iop Publishing Ltd |
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English |
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ISSN |
1751-8113 |
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WOS:000319044900004 |
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no |
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yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1457 |
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Author |
Andrianopoli, L.; Merino, N.; Nadal, F.; Trigiante, M. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
General properties of the expansion methods of Lie algebras |
Type |
Journal Article |
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Year |
2013 |
Publication |
Journal of Physics A |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
J. Phys. A |
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Volume |
46 |
Issue |
36 |
Pages |
365204 - 33pp |
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Abstract |
The study of the relation between Lie algebras and groups, and especially the derivation of new algebras from them, is a problem of great interest in mathematics and physics, because finding a new Lie group from an already known one also means that a new physical theory can be obtained from a known one. One of the procedures that allow us to do so is called expansion of Lie algebras, and has been recently used in different physical applications-particularly in gauge theories of gravity. Here we report on further developments of this method, required to understand in a deeper way their consequences in physical theories. We have found theorems related to the preservation of some properties of the algebras under expansions that can be used as criteria and, more specifically, as necessary conditions to know if two arbitrary Lie algebras can be related by some expansion mechanism. Formal aspects, such as the Cartan decomposition of the expanded algebras, are also discussed. Finally, an instructive example that allows us to check explicitly all our theoretical results is also provided. |
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Address |
[Andrianopoli, L.; Nadal, F.; Trigiante, M.] Politecn Torino, Dipartimento Sci Applicata & Tecnol DISAT, I-10129 Turin, Italy, Email: nelson.merino@ucv.cl |
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Iop Publishing Ltd |
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1751-8113 |
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WOS:000323421800008 |
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no |
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yes |
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yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1560 |
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Author |
Davesne, D.; Pastore, A.; Navarro, J. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Skyrme effective pseudopotential up to the next-to-next-to-leading order |
Type |
Journal Article |
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Year |
2013 |
Publication |
Journal of Physics G |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
J. Phys. G |
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Volume |
40 |
Issue |
9 |
Pages |
095104 - 8pp |
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Abstract |
The explicit form of the next-to-next-to-leading order ((NLO)-L-2) of the Skyrme effective pseudopotential compatible with all required symmetries and especially with gauge invariance is presented in a Cartesian basis. It is shown in particular that for such a pseudopotential there is no spin-orbit contribution and that the D-wave term suggested in the original Skyrme formulation does not satisfy the invariance properties. The six new (NLO)-L-2 terms contribute to both the equation of state and the Landau parameters. These contributions to symmetric nuclear matter are given explicitly and discussed. |
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Address |
[Davesne, D.] Univ Lyon, F-69622 Lyon, France, Email: davesne@ipnl.in2p3.fr |
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Iop Publishing Ltd |
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ISSN |
0954-3899 |
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Notes |
WOS:000323135200010 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1558 |
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Author |
XENON100 Collaboration (Aprile, E. et al); Orrigo, S.E.A. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
The neutron background of the XENON100 dark matter search experiment |
Type |
Journal Article |
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Year |
2013 |
Publication |
Journal of Physics G |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
J. Phys. G |
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Volume |
40 |
Issue |
11 |
Pages |
115201 - 17pp |
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Abstract |
TheXENON100 experiment, installed underground at the LaboratoriNazionali del Gran Sasso, aims to directly detect dark matter in the form of weakly interacting massive particles (WIMPs) via their elastic scattering off xenon nuclei. This paper presents a study on the nuclear recoil background of the experiment, taking into account neutron backgrounds from (alpha, n) reactions and spontaneous fission due to natural radioactivity in the detector and shield materials, as well as muon-induced neutrons. Based on MonteCarlo simulations and using measured radioactive contaminations of all detector components, we predict the nuclear recoil backgrounds for the WIMP search results published by theXENON100 experiment in 2011 and 2012, 0.11(-0.04)(+0.08) events and 0.17(-0.07)(+0.12) events, respectively, and conclude that they do not limit the sensitivity of the experiment. |
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Address |
[Aprile, E.; Budnik, R.; Choi, B.; Contreras, H.; Giboni, K-L; Goetzke, L. W.; Lim, K. E.; Fernandez, A. J. Melgarejo; Messina, M.; Plante, G.; Rizzo, A.] Columbia Univ, Dept Phys, New York, NY 10027 USA, Email: alexkish@physik.uzh.ch |
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Iop Publishing Ltd |
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English |
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ISSN |
0954-3899 |
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Notes |
WOS:000325766300004 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1684 |
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Author |
Verdu-Andres, S.; Amaldi, U.; Faus-Golfe, A. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
CABOTO, a high-gradient linac for hadrontherapy |
Type |
Journal Article |
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Year |
2013 |
Publication |
Journal of Radiation Research |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
J. Radiat. Res. |
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Volume |
54 |
Issue |
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Pages |
155-161 |
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Keywords |
hadrontherapy; high-gradient linac; cyclinac; carbon ion therapy; multipainting |
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Abstract |
The field of hadrontherapy has grown rapidly in recent years. At present the therapeutic beam is provided by a cyclotron or a synchrotron, but neither cyclotrons nor synchrotrons present the best performances for hadrontherapy. The new generation of accelerators for hadrontherapy should allow fast active energy modulation and have a high repetition rate, so that moving organs can be appropriately treated in a reasonable time. In addition, a reduction of the dimensions and cost of the accelerators for hadrontherapy would make the acquisition and operation of a hadrontherapy facility more affordable, which would translate into great benefits for the potential hadrontherapy patients. The 'cyclinac', an accelerator concept that combines a cyclotron with a high-frequency linear accelerator (linac), is a fast-cycling machine specifically conceived to allow for fast active energy modulation. The present paper focuses on CABOTO (CArbon BOoster for Therapy in Oncology), a compact, efficient high-frequency linac that can accelerate C6+ ions and H-2 molecules from 150-410 MeV/u in similar to 24 m. The paper presents the latest design of CABOTO and discusses its performances. |
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Address |
[Verdu-Andres, Silvia; Amaldi, Ugo] Fdn Tera, I-28100 Novara, Italy, Email: sverdu@bnl.gov |
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Publisher |
Oxford Univ Press |
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English |
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ISSN |
0449-3060 |
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Notes |
WOS:000321463900021 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1506 |
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Permanent link to this record |
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Author |
Roman, F.L.; Abler, D.; Kanellopoulos, V.; Amoros, G.; Davies, J.; Dosanjh, M.; Jena, R.; Kirkby, N.; Peach, K.; Salt, J. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Hadron therapy information sharing prototype |
Type |
Journal Article |
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Year |
2013 |
Publication |
Journal of Radiation Research |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
J. Radiat. Res. |
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Volume |
54 |
Issue |
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Pages |
56-60 |
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Keywords |
hadron therapy; proton therapy; data federation; web portal; eHealth; cancer informatics |
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Abstract |
The European PARTNER project developed a prototypical system for sharing hadron therapy data. This system allows doctors and patients to record and report treatment-related events during and after hadron therapy. It presents doctors and statisticians with an integrated view of adverse events across institutions, using open-source components for data federation, semantics, and analysis. There is a particular emphasis upon semantic consistency, achieved through intelligent, annotated form designs. The system as presented is ready for use in a clinical setting, and amenable to further customization. The essential contribution of the work reported here lies in the novel data integration and reporting methods, as well as the approach to software sustainability achieved through the use of community-supported open-source components. |
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Address |
[Roman, Faustin Laurentiu; Abler, Daniel; Kanellopoulos, Vassiliki; Dosanjh, Manjit] CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland, Email: faustin.roman@medaustron.at |
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Oxford Univ Press |
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English |
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0449-3060 |
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Notes |
WOS:000321463900008 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1519 |
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Permanent link to this record |
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Author |
Villaescusa-Navarro, F.; Vogelsberger, M.; Viel, M.; Loeb, A. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Neutrino signatures on the high-transmission regions of the Lyman alpha forest |
Type |
Journal Article |
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Year |
2013 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
Mon. Not. Roy. Astron. Soc. |
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Volume |
431 |
Issue |
4 |
Pages |
3670-3677 |
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Keywords |
neutrinos; intergalactic medium; quasars: absorption lines; cosmology: theory; large-scale structure of Universe |
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Abstract |
We quantify the impact of massive neutrinos on the statistics of low-density regions in the intergalactic medium as probed by the Lyman alpha forest at redshifts z = 2.2-4. Based on mock but realistic quasar (QSO) spectra extracted from hydrodynamic simulations with cold dark matter, baryons and neutrinos, we find that the probability distribution of weak Lyman alpha absorption features, as sampled by Lyman alpha flux regions at high transmissivity, is strongly affected by the presence of massive neutrinos. We show that systematic errors affecting the Lyman alpha forest reduce but do not erase the neutrino signal. Using the Fisher matrix formalism, we conclude that the sum of the neutrino masses can be measured, using the method proposed in this paper, with a precision smaller than 0.4 eV using a catalogue of 200 high-resolution (signal-to-noise ratio similar to 100) QSO spectra. This number reduces to 0.27 eV by making use of reasonable priors in the other parameters that also affect the statistics of the high-transitivity regions of the Lyman alpha forest. The constraints obtained with this method can be combined with independent bounds from the cosmic microwave background, large-scale structures and measurements of the matter power spectrum from the Lyman alpha forest to produce tighter upper limits on the sum of the masses of the neutrinos. |
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Address |
Univ Valencia, IFIC, CSIC, E-46071 Valencia, Spain, Email: viel@oats.inaf.it |
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Publisher |
Oxford Univ Press |
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English |
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ISSN |
0035-8711 |
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Notes |
WOS:000319479000057 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1458 |
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Permanent link to this record |
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Author |
Manera, M.; Scoccimarro, R.; Percival, W.J.; Samushia, L.; McBride, C.K.; Ross, A.J.; Sheth, R.K.; White, M.; Reid, B.A.; Sanchez, A.G.; de Putter, R.; Xu, X.Y.; Berlind, A.A.; Brinkmann, J.; Maraston, C.; Nichol, B.; Montesano, F.; Padmanabhan, N.; Skibba, R.A.; Tojeiro, R.; Weaver, B.A. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: a large sample of mock galaxy catalogues |
Type |
Journal Article |
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Year |
2013 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
Mon. Not. Roy. Astron. Soc. |
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Volume |
428 |
Issue |
2 |
Pages |
1036-1054 |
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Keywords |
galaxies: haloes; large-scale structure of Universe |
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Abstract |
We present a fast method for producing mock galaxy catalogues that can be used to compute the covariance of large-scale clustering measurements and test analysis techniques. Our method populates a second-order Lagrangian perturbation theory (2LPT) matter field, where we calibrate masses of dark matter haloes by detailed comparisons with N-body simulations. We demonstrate that the clustering of haloes is recovered at similar to 10 per cent accuracy. We populate haloes with mock galaxies using a halo occupation distribution (HOD) prescription, which has been calibrated to reproduce the clustering measurements on scales between 30 and 80 h(-1) Mpc. We compare the sample covariance matrix from our mocks with analytic estimates, and discuss differences. We have used this method to make catalogues corresponding to Data Release 9 of the Baryon Oscillation Spectroscopic Survey (BOSS), producing 600 mock catalogues of the 'CMASS' galaxy sample. These mocks have enabled detailed tests of methods and errors, and have formed an integral part of companion analyses of these galaxy data. |
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Address |
Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England, Email: marc.manera@port.ac.uk |
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Oxford Univ Press |
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English |
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0035-8711 |
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Notes |
WOS:000318229000007 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1471 |
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Author |
Vincent, A.C.; Scott, P.; Trampedach, R. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Light bosons in the photosphere and the solar abundance problem |
Type |
Journal Article |
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Year |
2013 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
Mon. Not. Roy. Astron. Soc. |
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Volume |
432 |
Issue |
4 |
Pages |
3332-3339 |
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Keywords |
elementary particles; line: formation; Sun: abundances; Sun: atmosphere; cosmology: theory |
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Abstract |
Spectroscopy is used to measure the elemental abundances in the outer layers of the Sun, whereas helioseismology probes the interior. It is well known that current spectroscopic determinations of the chemical composition are starkly at odds with the metallicity implied by helioseismology. We investigate whether the discrepancy may be due to conversion of photons to a new light boson in the solar photosphere. We examine the impact of particles with axion-like interactions with the photon on the inferred photospheric abundances, showing that resonant axion-photon conversion is not possible in the region of the solar atmosphere in which line formation occurs. Although non-resonant conversion in the line-forming regions can in principle impact derived abundances, constraints from axion-photon conversion experiments rule out the couplings necessary for these effects to be detectable. We show that this extends to hidden photons and chameleons (which would exhibit similar phenomenological behaviour), ruling out known theories of new light bosons as photospheric solutions to the solar abundance problem. |
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Address |
[Vincent, A. C.] Univ Valencia, IFIC, CSIC, E-46071 Valencia, Spain, Email: vincent@ific.uv.es |
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Oxford Univ Press |
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English |
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0035-8711 |
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Notes |
WOS:000321053500058 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1481 |
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Permanent link to this record |
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Author |
Zamiralov, V.S.; Ozpineci, A.; Erkol, G. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
QCD sum rules for the coupling constants of vector mesons to octet baryons |
Type |
Journal Article |
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Year |
2013 |
Publication |
Moscow University Physics Bulletin |
Abbreviated Journal ![sorted by Abbreviated Journal field, ascending order (up)](img/sort_asc.gif) |
Mosc. Univ. Phys. Bull. |
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Volume |
68 |
Issue |
3 |
Pages |
205-209 |
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Keywords |
quantum chromodynamics; sum rules; baryons; vector mesons; Borel interval |
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Abstract |
The QCD sum rules on the light cone proposed by Wang for the coupling constants of the rho meson are generalized to the vector mesons omega and phi and all octet baryons, the I >-hyperon included. A comparison with other results is given. |
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Address |
[Zamiralov, V. S.] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia, Email: zamir@depni.sinp.msu.ru |
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Publisher |
Allerton Press Inc |
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English |
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ISSN |
0027-1349 |
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Notes |
WOS:000322139000004 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1517 |
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Permanent link to this record |