115305797
One loop contribution to symmetry breaking around a wormhole
18946277
Influence On The Physical Universe By Wormhole Generated Extra Dimensional space
We use the Gu-Huang model for a special case when the universe is seven dimensional. In the core of extra dimension we place a modified Gidding-Strominger wormhole. This wormhole is separated by a thin wall from the extra dimensional space. The wormhole content is assumed to satisfy the adiabatic gas law. The wormhole pressure penetrates into the extra dimension. We then solve the Einstein equation assuming that the real universe and the extra dimension contains only inextendable fluid with negligible local pressure. We show the physical universe expands because the time dependent Hubble parameter is positive. Under certain condition the deacceleration parameter, $q_0$, is also positive. But the most significant outcome of our investigation is the fact that $q_0$ fluctuates. If we can detect by observation that the acceleration fluctuates, our model will be an alternative explanation without the help of dark energy. We could however link dark energy with work done by wormhole pressure.
15360093
A wormhole-generated physical universe with refined approximation
We improved the approximation of the model of the wormhole generated physical universe constructed by Choudhury and Pendharkar. We show here that the negative pressure of the unphysical wormhole can generate the right physical condition to explain the correct sign of the deacceleration parameter $q_0$. The negative sign ofsign of $q_0$ implies an accelerating universe.
121785099
U and V sectors in the Bronzan‐Lee model
The Lehmann‐Symanzik‐Zimmermann (LSZ) formalism is used in the Bronzan‐Lee model to investigate the scattering processes in the lowest sectors. In this model, there are three heavy recoilless particles U, V, and N interacting with a θ particle. The processes allowed are U⇄Vθ and V⇄Nθ. In U and V sectors of this model all τ functions have been calculated, and relevant scattering and production amplitudes are evaluated. The mass, wavefunction, and vertex function renormalization constants have been found and they agree with the results previously obtained by Bronzan and later also by Liossatos.
117848193
Symmetry behavior of a higher-power self-interacting scalar field at finite temperature
We have generalized the finite-temperature treatment of the scalar field of Dolan and Jackiw up to the one-loop approximation by adding an extra term which is proportional to the sixth power of the field. The inclusion of such a term makes the theory nonrenormalizable. However, we have carried out, parallel to the renormalizable theory, a subtraction method which we call ''restricted renormalization'' in order to study the effect of the inclusion of this term. The critical temperature in the theory does not depend on the coupling constant kappa associated with the phi/sup 4/ term in the interaction. Also, the theory even at the phi/sup 4/ level depends on an integral parameter n, if we consider the critical-temperature equation as a complex equation. We are then forced to introduce different fields depending on the parameter n. However, not all n-values are allowed. Up to the approximation considered, the n-values have to be greater than 1.
116150107
Symmetry breaking by a special massless scalar field
59057471
Many faces of low mass neutralino dark matter in the unconstrained MSSM, LHC data and new signals
A bstractIf all strongly interacting sparticles (the squarks and the gluinos) in an un- constrained minimal supersymmetric standard model (MSSM) are heavier than the corre- sponding mass lower limits in the minimal supergravity (mSUGRA) model, obtained by the current LHC experiments, then the existing data allow a variety of electroweak (EW) sectors with light sparticles yielding dark matter (DM) relic density allowed by the WMAP data. Some of the sparticles may lie just above the existing lower bounds from LEP and lead to many novel DM producing mechanisms not common in mSUGRA. This is illustrated by revisiting the above squark-gluino mass limits obtained by the ATLAS Collaboration, with an unconstrained EW sector with masses not correlated with the strong sector. Using their selection criteria and the corresponding cross section limits, we find at the generator level using Pythia, that the changes in the mass limits, if any, are by at most 10-12 % in most scenarios. In some cases, however, the relaxation of the gluino mass limits are larger (≈ 20 %). If a subset of the strongly interacting sparticles in an unconstrained MSSM are within the reach of the LHC, then signals sensitive to the EW sector may be obtained. This is illustrated by simulating the bljT , l = e and μ, and bτ jT signals in i) the light stop scenario and ii) the light stop-gluino scenario with various light EW sectors allowedby the WMAP data. Some of the more general models may be realized with non-universal scalar and gaugino masses.
119115306
Neutralino dark matter confronted by the LHC constraints on electroweak SUSY signals
A bstractThe supersymmetric particles (sparticles) belonging exclusively to the electroweak sector of the minimal supersymmetric standard model (MSSM) may hold the key to the observed dark matter relic density in the universe even if all strongly interacting sparticles are very heavy. The importance of the light EW sparticles in DM physics and in producing spectacular collider signals is emphasized. It is shown that even the preliminary data on the direct searches of these sparticles at the LHC, significantly constrain the parameter space of the MSSM compatible with the observed relic density and provide useful hints about the future search prospects. If in addition to the electroweak sparticles the gluinos are also within the reach of the LHC experiments, then the gluino mass limits in the light slepton scenario obtained via the canonical jets + / channel may be relaxed by as much as 25 % compared to the existing limits. But the corresponding same sign dilepton (SSD) + jets + / signal will yield enhanced limits competitive with the strongest limits currently available. This is illustrated with the help of benchmark scenarios at the generator level using PYTHIA. If the gluinos are just beyond the current reach of the LHC, then the generic n-lepton + m-jets + missing energy signal may discriminate between different DM producing mechanisms by comparing the signals corresponding to different values of n. This is illustrated by simulating the signals for n = 0 and n = 2 (the SSD signal).
53697035
The electroweak sector of the pMSSM in the light of LHC - 8 TeV and other data
A bstractUsing the chargino-neutralino and slepton search results from the LHC in conjunction with the WMAP/PLANCK and (g − 2)μ data, we constrain several generic pMSSM models with decoupled strongly interacting sparticles, heavier Higgs bosons and characterized by different hierarchies among the EW sparticles. We find that some of them are already under pressure and this number increases if bounds from direct detection experiments like LUX are taken into account, keeping in mind the associated uncertainties. The XENON1T experiment is likely to scrutinize the remaining models closely. Analysing models with heavy squarks, a light gluino along with widely different EW sectors, we show that the limits on mg˜$$ {m}_{\tilde{g}} $$ are not likely to be below 1.1 TeV, if a multichannel analysis of the LHC data is performed. Using this light gluino scenario we further illustrate that in future LHC experiments the models with different EW sectors can be distinguished from each other by the relative sizes of the n-leptons + m-jets + T signals for different choices of n.