15454678
A REVIEW OF DISTRIBUTIONS ON THE STRING LANDSCAPE
We review some basic flux vacua counting techniques and results, focusing on the distributions of properties over different regions of the landscape of string vacua and assessing the phenomenological implications. The topics we discuss include: an overview of how moduli are stabilized and how vacua are counted; the applicability of effective field theory; the uses of and differences between probabilistic and statistical analysis (and the relation to the anthropic principle); the distribution of various parameters on the landscape, including cosmological constant, gauge group rank, and supersymmetry-breaking scale; "friendly landscapes;" open string moduli; the (in)finiteness of the number of phenomenologically viable vacua; etc. At all points, we attempt to connect this study to the phenomenology of vacua which are experimentally viable.
17960822
Raiders of the lost AdS
We demonstrate that under certain conditions a theory of conformal quantum mechanics will exhibit the symmetries of two half-Virasoro algebras. We further demonstrate the conditions under which these algebras combine to form a single-Virasoro algebra, and comment on the connection between this result and the AdS2/CFT1 correspondence.
118386561
Local scale-dependent non-gaussian curvature perturbations at cubic order
We calculate non-Gaussianities in the bispectrum and trispectrum arising from the cubic term in the local expansion of the scalar curvature perturbation. We compute to three-loop order and for general momenta. A procedure for evaluating the leading behavior of the resulting loop-integrals is developed and discussed. Finally, we survey unique non-linear signals which could arise from the cubic term in the squeezed limit. In particular, it is shown that loop corrections can cause fNLsq. to change sign as the momentum scale is varied. There also exists a momentum limit where τNL < 0 can be realized.
24171176
Dark-matter decay as a complementary probe of multicomponent dark sectors.
In single-component theories of dark matter, the 2→2 amplitudes for dark-matter production, annihilation, and scattering can be related to each other through various crossing symmetries. The detection techniques based on these processes are thus complementary. However, multicomponent theories exhibit an additional direction for dark-matter complementarity: the possibility of dark-matter decay from heavier to lighter components. We discuss how this new detection channel may be correlated with the others, and demonstrate that the enhanced complementarity which emerges can be an important ingredient in probing and constraining the parameter spaces of such models.
118483875
Gamma rays from bino-like dark matter in the MSSM
We consider regions of the parameter space of the Minimal Supersymmetric Standard Model (MSSM) with bino-like neutralino dark matter in which a large fraction of the total dark matter annihilation cross section in the present era arises from annihilation to final states with monoenergetic photons. The region of interest is characterized by light sleptons and heavy squarks. We find that it is possible for the branching fraction to final states with monoenergetic photons to be comparable to that for continuum photons, but in those cases the total cross section will be so small that it is unlikely to be observable. For models where dark matter annihilation may be observable in the present era, the branching fraction to final states with monoenergetic photons is O(1-10%).
119200596
From DAMA/LIBRA To Super-Kamiokande
We consider the prospects for probing low-mass dark matter with the Super-Kamiokande experiment. We show that upcoming analyses including fully-contained events with sensitivity to dark matter masses from 5 to 10 GeV can test the dark matter interpretation of the DAMA/LIBRA signal. We consider prospects of this analysis for two light dark matter candidates: neutralinos and WIMPless dark matter.
120729664
A Class of Well Behaved Charged Analogues of Schwarzchild’s Interior Solution
A class of well behaved charged analogues of Schwarzchild’s interior solution has been obtained using a particular electric intensity. The solutions of this class are utilized to depict a superdense star model with surface density 2×1014 g cm−3. The solution obtained is new and the pressure (p), density (c2ρ), velocity of sound $(\sqrt{( dp / c^{2}d\rho )} )$ and (p/(c2ρ)) are monotonically decreasing towards the pressure free interface. Moreover the adiabatic constant is found to be more than (4/3) which is necessary for stability under radial perturbation. Also the electric intensity increases monotonically towards the surface. The well behaved model has the maximum mass M=1.740793MΘ, Radius 12.130308 km. The redshift at the center and on the surface is given by z0=0.384261 and za=0.292489. Out of the models of superdense star obtained couple of models represent Vela Pulsar for (i) α2=1.03, b=0.33, $\frac{a^{2}}{R^{2}} = 0.15$, Radius=10.8566 km, M=1.18331MΘ, I=0.642601×1045, (ii) α2=1.1, b=0.3, $\frac{a^{2}}{R^{2}} = 0.16$, Radius=11.197533 km, M=1.311438MΘ, I=0.774508×1045. All the solutions mentioned above are reducible to Schwarzchild interior solution in the absence of charge.