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799
Massive neutrinos and cosmology
"... Cosmology can provide information on the absolute scale of neutrino masses, complementary to the results of tritium beta decay and neutrinoless double beta decay experiments. We show how the analysis of data from the anisotropies of the cosmic microwave background radiation and from the distribution ..."
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Cosmology can provide information on the absolute scale of neutrino masses, complementary to the results of tritium beta decay and neutrinoless double beta decay experiments. We show how the analysis of data from the anisotropies of the cosmic microwave background radiation and from the distribution of cosmological largescale structure, combined with other experimental results, provides an upper bound on the sum of neutrino masses. We also discuss the sensitivity of future cosmological data to neutrino masses. 1
BoseEinstein condensates with tunable atomatom interactions: the first experiments with 85Rb BECs
, 2001
"... final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline. ..."
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final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline.
Split supersymmetry
 Nucl. Phys. B 699
, 2004
"... The naturalness criterion applied to the cosmological constant implies a newphysics threshold at 10 −3 eV. Either the naturalness criterion fails, or this threshold does not influence particle dynamics at higher energies. It has been suggested that the Higgs naturalness problem may follow the same ..."
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The naturalness criterion applied to the cosmological constant implies a newphysics threshold at 10 −3 eV. Either the naturalness criterion fails, or this threshold does not influence particle dynamics at higher energies. It has been suggested that the Higgs naturalness problem may follow the same fate. We investigate this possibility and, abandoning the hierarchy problem, we use unification and dark matter as the only guiding principles. The model recently proposed by ArkaniHamed and Dimopoulos emerges as a very interesting option. We study it in detail, analysing its structure, and For decades the naturalness (or hierarchy) problem of the Higgs mass term has been the guiding principle to construct theories beyond the Standard Model (SM). The criterion of naturalness has the exciting implication that the SM should stop to be valid at a scale around the TeV, and new dynamics should occur at energies reachable by present or nearfuture
Presentations
 of Library Instruction Programs.” Library Assessment Conference
, 2006
"... SYMPOSIUM ‘Historic Towns Working Together’ ..."
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Matterenhanced threeflavor oscillations and the solar neutrino problem, Phys
 Rev. D
, 1996
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The number density of a charged relic
, 807
"... We investigate scenarios in which a charged, longlived scalar particle decouples from the primordial plasma in the Early Universe. We compute the number density at time of freezeout considering both the cases of abelian and nonabelian interactions and including the effect of Sommerfeld enhancemen ..."
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We investigate scenarios in which a charged, longlived scalar particle decouples from the primordial plasma in the Early Universe. We compute the number density at time of freezeout considering both the cases of abelian and nonabelian interactions and including the effect of Sommerfeld enhancement at low initial velocity. We also discuss as extreme case the maximal cross section that fulfils the unitarity bound. We then compare these number densities to the exotic nuclei searches for stable relics and to the BBN bounds on unstable relics and draw conclusions for the cases of a stau or stop NLSP in supersymmetric models with a gravitino or axino LSP. Contents 1
Direct determination of neutrino mass parameters at future colliders. arXiv:0712.3912 [hepph
, 2007
"... If the observed light neutrino masses are induced by their Yukawa couplings to singlet righthanded neutrinos, natural smallness of those renders direct collider tests of the electroweak scale neutrino mass mechanisms almost impossible both in the case of Dirac and Majorana (seesaw of type I) neutrin ..."
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If the observed light neutrino masses are induced by their Yukawa couplings to singlet righthanded neutrinos, natural smallness of those renders direct collider tests of the electroweak scale neutrino mass mechanisms almost impossible both in the case of Dirac and Majorana (seesaw of type I) neutrinos. However, in the triplet Higgs seesaw scenario the smallness of light neutrino masses may come from the smallness of B − L breaking parameters, allowing sizable Yukawa couplings even for a TeV scale triplet. We show that, in this scenario, measuring the branching fractions of doubly charged Higgs to different samecharged lepton flavours at LHC and/or ILC experiments will allow one to measure the neutrino mass parameters which neutrino oscillation experiments are insensitive to, including the neutrino mass hierarchy, lightest neutrino mass and Majorana phases. In recent past neutrino oscillation experiments have shown convincingly that at least two light neutrinos have nonzero masses and their mixing is characterized by two large mixing angles [1]. Those facts constitute indisputable evidence of new physics beyond the standard model
Flavor production in Pb(160A GeV) on Pb collisions: Effect of color ropes and hadronic rescattering”, Phys
 Rev. C
, 1995
"... Collective interactions in the preequilibrium quark matter and hadronic resonance gas stage of ultrarelativistic nucleusnucleus collisions are studied in the framework of the the transport theoretical approach RQMD. The paper reviews string fusion into color ropes and hadronic rescattering which se ..."
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Collective interactions in the preequilibrium quark matter and hadronic resonance gas stage of ultrarelativistic nucleusnucleus collisions are studied in the framework of the the transport theoretical approach RQMD. The paper reviews string fusion into color ropes and hadronic rescattering which serve as models for these interactions. Hadron production in central Pb(160AGeV) on Pb collisions has been calculated. The changes of the final flavor composition are more pronounced than in previous RQMD studies of light ion induced reactions at 200AGeV. The ratio of created quark pairs s¯s/(uū+d ¯ d) is enhanced by a factor of 2.4 in comparison to pp results. Color rope formation increases the initially produced antibaryons to 3 times the value in the ‘NN mode’, but only one quarter of the produced antibaryons survives because of subsequent strong absorption. The differences in the final particle composition for Pb on Pb collisions compared to S induced reactions are attributed to the hadronic resonance gas stage which is baryonricher and lasts longer.
QCD bound states and their response to extremes of temperature and density
"... We describe the application of DysonSchwinger equations to the calculation of hadron observables. The studies at zero temperature (T) and quark chemical potential (µ) provide a springboard for the extension to finite(T, µ). Our exemplars highlight that much of hadronic physics can be understood as ..."
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We describe the application of DysonSchwinger equations to the calculation of hadron observables. The studies at zero temperature (T) and quark chemical potential (µ) provide a springboard for the extension to finite(T, µ). Our exemplars highlight that much of hadronic physics can be understood as simply a manifestation of the nonperturbative, momentumdependent dressing of the elementary Schwinger functions in QCD. 1 DSE Essentials The DysonSchwinger equations (DSEs) provide a Poincaré invariant, continuum approach to solving quantum field theories. They are an infinite tower of coupled integral equations, with the equation for a particular npoint function involving at least one m> npoint function. A tractable problem is only obtained if one truncates the system, and historically this has provided an impediment to the application of DSEs: a priori it can be difficult to judge whether a particular truncation scheme will yield qualitatively or quantitatively reliable results for the quantity sought. As integral equations, the analysis