Abstract
Starburst and Starforming galaxies are astrophysical sources characterised by an intense star-forming activity. They are reservoirs of cosmic rays and host a high density target gas in the ...central region called Starburst Nucleus (SBN). In this contribution, we present the results of two model studies regarding the high-energy neutrino production. For the first one, we perform a diffuse analysis. In particular, we consider a blending of spectral indexes and obtain a multi-component description of extragalactic background light (EGB), high energy starting events (HESE) and high-energy cascade IceCube data. Remarkably, we find that, differently from recent prototype scenarios, the spectral index blending allows starburst galaxies to account for up to 40% of the HESE events at 95.4% CL and favors a maximal energy of the accelerated cosmic rays at teens of PeV. For the second one, we present a point-like analysis regarding nearby SFGs. We apply the calorimetric approach to the known SBGs within 100 Mpc, considering, were possible, a source-by-source description of the star formation rate. These results are then compared with what IceCube has observed at TeV energies as well as with what can be expected from the incoming KM3NeT and IceCube gen 2.
Chances for SUSY-GUT in the LHC Epoch Berezhiani, Zurab; Chianese, Marco; Miele, Gennaro ...
The journal of high energy physics,
08/2015, Volume:
2015, Issue:
8
Journal Article
Peer reviewed
Open access
A
bstract
The magic couple of SUSY and GUT still appears the most elegant and predictive physics concept beyond the Standard Model. Since up to now LHC found no evidence for supersymmetric particles ...it becomes of particular relevance to determine an upper bound of the energy scale they have to show up. In particular, we have analyzed a generic SUSY-GUT model assuming one step unification like in SU(5), and adopting
naturalness
principles, we have obtained general bounds on the mass spectrum of SUSY particles. We claim that if a SUSY gauge coupling unification takes place, the lightest gluino or Higgsino cannot have a mass larger than ∼ 20 TeV. Such a limit is of interest for planning new accelerator machines.
This is a collection of review articles and more specialized papers on the main issues of early universe physics. Both theoretical and experimental fields of research are dealt with.
This is a collection of review articles and more specialized papers on the main issues of early universe physics. Both theoretical and experimental fields of research are dealt with.Contents:Direct ...Search for Wimps (R Bernabei et al.)Ultra High Energy Cosmic Rays (P Blasi)Structure and Evolution of Cluster Galaxies (G Busarello et al.)Status of Ligo Interferometers (E D'Ambrosio)The Cosmic Renaissance: Reionization Era as the New Cosmological Frontier (S G Djorgovski)High-Energy Neutrino Astronomy (F Halzen)Microlensing Towards the LMC (P Jetzer)Present and Future Neutrino Oscillation Experiments (T Kajita)Axion Dark Matter (E Massó)Dark Matter and Supersymmetry (S Scopel)Curvature Quintessence (S Capozziello et al.)Van Der Waals Quintessence (S Capozziello et al.)Effects of BBN on Population III Stars (F Iocco)An Updated Nuclear Reaction Network for BBN (P D Serpico)Active Star-Forming Galaxies in Pairs in the 2DF (G Sorrentino et al.)and other papersReadership: Particle physicists interested in the early universe, as well as astrophysicists and cosmologists.
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In this paper, we develop an iterative approach to span the whole set of exotic matter models able to drive a traversable wormhole. The method, based on a Taylor expansion of metric and ...stress-energy tensor components in a neighbourhood of the wormhole throat, reduces the Einstein equation to an infinite set of algebraic conditions, which can be satisfied order by order. The approach easily allows the implementation of further conditions linking the stress-energy tensor components among each other, like symmetry conditions or equations of state. The method is then applied to some relevant examples of exotic matter characterised by a constant energy density and that also show an isotropic behaviour in the stress-energy tensor or obeying to a quintessence-like equation of state.
CpG dinucleotide-rich genomic DNA regions, known as CpG islands (CGIs), can be methylated at their cytosine residues as an epigenetic mark that is stably inherited during cell mitosis. Differentially ...methylated regions (DMRs) are genomic regions showing different degrees of DNA methylation in multiple samples. In this study, we focused our attention on CGIs showing different DNA methylation between two culture replicas of the same cell line.
We used methylation data of 35 cell lines from the Encyclopedia of DNA Elements (ENCODE) consortium to identify CpG islands that were differentially methylated between replicas of the same cell line and denoted them Inter Replicas Differentially Methylated CpG islands (IRDM-CGIs). We identified a group of IRDM-CGIs that was consistently shared by different cell lines, and denoted it common IRDM-CGIs. X chromosome CGIs were overrepresented among common IRDM-CGIs. Autosomal IRDM-CGIs were preferentially located in gene bodies and intergenic regions had a lower G + C content, a smaller mean length, and a reduced CpG percentage. Functional analysis of the genes associated with autosomal IRDM-CGIs showed that many of them are involved in DNA binding and development.
Our results show that several specific functional and structural features characterize common IRDM-CGIs. They may represent a specific subset of CGIs that are more prone to being differentially methylated for their intrinsic characteristics.
The Large Magellanic Cloud (LMC), at only 50 kpc away from us and known to be dark matter dominated, is clearly an interesting place where to search for dark matter annihilation signals. In this ...paper, we estimate the synchrotron emission due to weakly interacting massive particle (WIMP) annihilation in the halo of the LMC at two radio frequencies, 1.4 and 4.8 GHz, and compare it to the observed emission, in order to impose constraints in the WIMP mass versus annihilation cross-section plane. We use available Faraday rotation data from background sources to estimate the magnitude of the magnetic field in different regions of the LMC's disc, where we calculate the radio signal due to dark matter annihilation. We account for the e
+
e
− energy losses due to synchrotron, inverse Compton scattering and bremsstrahlung, using the observed hydrogen and dust temperature distribution on the LMC to estimate their efficiency. The extensive use of observations, allied with conservative choices adopted in all the steps of the calculation, allows us to obtain very realistic constraints.
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