2,073 research outputs found
Psychodynamic therapy: a poorly defined concept with questionable evidence
R34 MH086668 - NIMH NIH HHS; R01 AT007257 - NCCIH NIH HHS; R21 MH101567 - NIMH NIH HHS; R34 MH099311 - NIMH NIH HHS; R21 MH102646 - NIMH NIH HHS; K23 MH100259 - NIMH NIH HHS; R01 MH099021 - NIMH NIH HH
A Quantum Bound-State Description of Black Holes
A relativistic framework for the description of bound states consisting of a
large number of quantum constituents is presented, and applied to black-hole
interiors. At the parton level, the constituent distribution, number and energy
density inside black holes are calculated, and gauge corrections are discussed.
A simple scaling relation between the black hole mass and constituent number is
established.Comment: Sections on asymptotic framework for bound states and composite
operator renormalization added. Derivation of main results presented in
greater detail. References added. Submitted to Nuclear Physics
The multivariate Piecing-Together approach revisited
The univariate Piecing-Together approach (PT) fits a univariate generalized
Pareto distribution (GPD) to the upper tail of a given distribution function in
a continuous manner. A multivariate extension was established by Aulbach et al.
(2012a): The upper tail of a given copula C is cut off and replaced by a
multivariate GPD-copula in a continuous manner, yielding a new copula called a
PT-copula. Then each margin of this PT-copula is transformed by a given
univariate distribution function. This provides a multivariate distribution
function with prescribed margins, whose copula is a GPD-copula that coincides
in its central part with C. In addition to Aulbach et al. (2012a), we achieve
in the present paper an exact representation of the PT-copula's upper tail,
giving further insight into the multivariate PT approach. A variant based on
the empirical copula is also added. Furthermore our findings enable us to
establish a functional PT version as well.Comment: 12 pages, 1 figure. To appear in the Journal of Multivariate Analysi
Brane Induced Gravity: From a No-Go to a No-Ghost Theorem
Numerous claims in the literature suggest that gravity induced on a higher
co-dimensional surface violates unitarity in the weak coupling regime. However,
it remained unclear, why a conserved source localized on this surface and
giving rise to an induced gravity term at low energies would absorb and emit
the associated ghost, given a consistent source-free theory. In this article it
is shown that the appearance of the induced Einstein Hilbert term does not
threaten the unitarity of the theory. The physics arguments behind this
statement are presented in a semi-covariant language, but the detailed proof is
given using Dirac's constraint analysis. It is shown that the would-be ghost
highlighted in previous works is non-dynamical and therefore not associated
with a state in the Hilbert space. As a result of these investigations, brane
induced gravity goes without a ghost, opening an exciting window of opportunity
for consistent deformations of gravity at the largest observable distances.Comment: 13 pages, v2: matches version published in Physical Review
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