1,725 research outputs found
Cancellation of divergences in SYM/Type IIB Supergravity correspondence
Using Schr\"odinger functional methods, we show that in the
SYM/Type IIB Supergravity correspondence the renormalisation of the boundary
Newton and gravitational constants arising from bulk fields cancels when we sum
over all the Kaluza-Klein modes of Supergravity. This accords with the expected
finiteness of SYM, and it is expected that other renormalisations
cancel in a similar way.Comment: 7 page
Order corrections to the conformal anomaly of the (2,0) theory in six dimensions
Using Supergravity on we calculate the bulk one-loop
contribution to the conformal anomaly of the (2,0) theory describing
coincident M5 branes. When this is added to the tree-level result, and an
additional subleading order contribution calculated by Tseytlin, it gives an
expression for the anomaly that interpolates correctly between the large
theory and the free (2,0) tensor theory corresponding to N=1. Thus we can argue
that we have identified the exact -dependence of the anomaly, which may have
a simple protected form valid away from the large limit.Comment: LaTeX, 9 page
AdS/CFT boundary conditions and multi-trace perturbations for fermions
Extending the results of a previous paper, we consider boundary conditions
for spinor fields and other fields of non-zero spin in the AdS/CFT
correspondence. We calculate the RG-flow induced by double trace perturbations
dual to bulk spinor fields. For spinors there is a half-unit shift in the
central charge in running from the UV to the IR, in accordance with the
c-theorem.Comment: 6 pages, more refs added, discussion clarifying sign of shif
AdS/CFT boundary conditions, multi-trace perturbations, and the c-theorem
We discuss possible choices for boundary conditions in the AdS/CFT
correspondence, and calculate the renormalisation group flow induced by a
double-trace perturbation. In running from the UV to the IR there is a unit
shift in the central charge. The discrepancy between our result and results
obtained by other authors is accounted for by the discovery that there is a
non-trivial flow for perturbations induced by bulk fields with masses
saturating the Breitenlohner-Freedman bound.Comment: LaTeX, 10 pages, refs added, original (correct!) result restore
Demographic Change, Social Security Systems, and Savings
In theory, improvements in healthy life expectancy should generate increases in the average age of retirement, with little effect on savings rates. In many countries, however, retirement incentives in social security programs prevent retirement ages from keeping pace with changes in life expectancy, leading to an increased need for life-cycle savings. Analyzing a cross-country panel of macroeconomic data, we find that increased longevity raises aggregate savings rates in countries with universal pension coverage and retirement incentives, though the effect disappears in countries with pay-as-you-go systems and high replacement rates
Demographic Change, Social Security Systems, and Savings
In theory, improvements in health life expectancy should generate increases in the average age of retirement, with little effect on savings rates. In many countries, however, retirement incentives in social security programs prevent retirement age from keeping pace with changes in life expectancy, leading to an increased need for life-cycle savings. Analyzing a cross-country panel of macroeconomic data, we find that increased longevity raises aggregate savings rates in countries with universal pension coverage and retirement incentives, though the effect disappears in countries with pay-as-you-go systems and high replacement rates.Savings, demographic change, population economics, social security systems
Demographic Change, Social Security Systems, and Savings
In theory, improvements in healthy life expectancy should generate increases in the average age of retirement, with little effect on savings rates. In many countries, however, retirement incentives in social security programs prevent retirement ages from keeping pace with changes in life expectancy, leading to an increased need for life-cycle savings. Analyzing a cross-country panel of macroeconomic data, we find that increased longevity raises aggregate savings rates in countries with universal pension coverage and retirement incentives, though the effect disappears in countries with pay-as-you-go systems and high replacement rates.
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