The Importance of Slow-roll Corrections During Multi-field Inflation

We re-examine the importance of slow-roll corrections during the evolution of cosmological perturbations in models of multi-field inflation. We find that in many instances the presence of light degrees of freedom leads to situations in which next to leading order slow-roll corrections become significant. Examples where we expect such corrections to be crucial include models in which modes exit the Hubble radius while the inflationary trajectory undergoes an abrupt turn in field space, or during a phase transition. We illustrate this with two examples -- hybrid inflation and double quadratic inflation. Utilizing both analytic estimates and full numerical results, we find that corrections can be as large as 20%. Our results have implications for many existing models in the literature, as these corrections must be included to obtain accurate observational predictions -- particularly given the level of accuracy expected from CMB experiments such as PlanckComment: v1: 21 pages, 3 figures, 1 appendix. v2: clarifications to {\S}{\S}2.1, 3.1 and 4, {\S}5.3 added, references added, results unchanged. Matches published version in JCA

On low-energy predictions of unification models inspired by F-theory

The aim of this paper is to discuss phenomenological consequences of a particular unification model (Z_3 model) inspired by F-theory. The most distinctive feature of this model is a variety of (cosmologically feasible) options for the NLSP and NNLSP, beyond the usually considered benchmark scenarios.Comment: LaTeX, 11 pages, 12 figure

Experimental research on helical coil biomass boiler with oil as a heating fluid

The aim of the paper is to present the results of experimental research conducted on helical coil biomass boiler with oil as a heating fluid, which is a central unit of co generative micro powerplant designed and tested at the Institute of Fluid-Flow Machinery in Gdańsk. Experimental data has been used to work out characteristics of the device in terms of power, efficiency and oil parameters for moderate/high excess air numbers and fuel flow rates. Furthermore, during the research the authors came across various obstacles, which can be easily eliminated in the future prototypes by applying presented changes in construction

Thermal oil biomass boiler dynamics as a part of the micro-CHP ORC plant

The aim of the paper is to present the results of experimental research conducted on two helical coil biomass boilers with oil heatingagent, which are acentral unitsof co generative micro powerplant designed and built in IFFM in Gdańsk. Experimental data served as a source for defining the interdependencies governing the dynamics of the micro-CHP as a whole. Furthermore, during the research the authors came across a few possible modifications to the construction that may yet improve the device

Design and distribution of air nozzles in the biomass boiler assembly

Due to energy crisis as well as increasing pollution of the enviroment, renewable energy sources usage increases all over the world. These facts encouraged authors to start research over developing a uniform biomass boiler calculation model. Paper presents the design of biomass boiler assembly created for the organic Rankine cycle unit since these systems could achieve strong position in energy industry. To achieve optimal performance of boiler assembly, two additional devices have been designed: the economizer and air preheater. Such installation allows to reach the assembly efficiency of 82%. The research over the air nozzles placement in the combustion chamber in order to ensure the best firebox efficiency is also presented. Modeling is based on computational fluid dynamics simulations of pyrolysis on the moving grate. Released gases are being transported to the combustion chamber, mixed with air from the nozzles and combusted. Furthermore, the model assumes different distribution and composition of gases across the moving grate

Supersymmetric mass spectra for gravitino dark matter with a high reheating temperature

Supersymmetric theories with gravitino dark matter generally do not allow the high reheating temperature required by thermal leptogenesis without running afoul of relic abundance or big bang nucleosynthesis constraints. We report on a search for parameter space that satisfies these requirements with neutralino as the next-to-lightest superpartner. The main implication is the near degeneracy of the gluino with the other neutralinos in the spectrum. The leading discovery channel at the LHC for this scenario is through monojet plus missing energy events