Holographic Complexity of Einstein-Maxwell-Dilaton Gravity

We study the holographic complexity of Einstein-Maxwell-Dilaton gravity using the recently proposed "complexity = volume" and "complexity = action" dualities. The model we consider has a ground state that is represented in the bulk via a so-called hyperscaling violating geometry. We calculate the action growth of the Wheeler-DeWitt patch of the corresponding black hole solution at non-zero temperature and find that, in the presence of violations of hyperscaling, there is a parametric enhancement of the action growth rate. We partially match this behavior to simple tensor network models which can capture aspects of hyperscaling violation. We also exhibit the switchback effect in complexity growth using shockwave geometries and comment on a subtlety of our action calculations when the metric is discontinuous at a null surface.Comment: 30 pages; v2: Fixed a technical error. Corrected result no longer has a logarithmic divergence in the action growth rate associated with the singularity. Conjectured complexity growth rate now also matches better with tensor network model

Incentive Contracting versus Ownership Reforms: Evidence from China's Township and Village Enterprises

We use a unique data set to study the implications of introducing managerial incentives and, in addition to incentives, better defined ownership for a firm's financial performance. The data set traces the ten-year history of 80 Chinese rural enterprises, known as township and village enterprises. During this period, these originally (mostly) community owned, local government controlled socialist collective firms were first allowed to introduce managerial incentive contracts and then to change to ownership forms of more clearly defined income and control rights. The study finds that introducing managerial incentives had a positive but statistically insignificant effect on these firms' performance measured by accounting return on assets or return on equity. It also finds that the performance is significantly better under ownership forms of better-defined rights than under community ownership even when the latter is supplemented with managerial incentive contracts. The findings shed lights on some important theoretical and policy issues.http://deepblue.lib.umich.edu/bitstream/2027.42/39749/3/wp365.pd

PURCHASE OF DEVELOPMENT RIGHTS (PDR) PROGRAMS: HAVE WE PAID TOO MUCH?

While many states such as Vermont have adopted the Purchase of Development Rights (PDR) programs to protect farmland, few studies have examined how the prices of such development rights are determined and whether the prices are close to the market value. Using data from the state of Vermont, this study first examines the effects of development restrictions on the market price of rural and semi-rural properties and then addresses the question of whether the prices paid for development rights are close to the market value. Our results based on an hedonic model suggest that development restrictions do reduce the market value of rural and semi-rural properties in Northern Vermont but the prices paid by Vermont's PDR programs are significantly higher than the estimated market value.Agricultural and Food Policy, Land Economics/Use,

Efficiently Exploring Ordering Problems through Conflict-directed Search

In planning and scheduling, solving problems with both state and temporal constraints is hard since these constraints may be highly coupled. Judicious orderings of events enable solvers to efficiently make decisions over sequences of actions to satisfy complex hybrid specifications. The ordering problem is thus fundamental to planning. Promising recent works have explored the ordering problem as search, incorporating a special tree structure for efficiency. However, such approaches only reason over partial order specifications. Having observed that an ordering is inconsistent with respect to underlying constraints, prior works do not exploit the tree structure to efficiently generate orderings that resolve the inconsistency. In this paper, we present Conflict-directed Incremental Total Ordering (CDITO), a conflict-directed search method to incrementally and systematically generate event total orders given ordering relations and conflicts returned by sub-solvers. Due to its ability to reason over conflicts, CDITO is much more efficient than Incremental Total Ordering. We demonstrate this by benchmarking on temporal network configuration problems that involve routing network flows and allocating bandwidth resources over time.Comment: Accepted at ICAPS2019. 9 pages, 4 figures, 2 tables

Flavored Dark Matter and R-Parity Violation

Minimal Flavor Violation offers an alternative symmetry rationale to R-parity conservation for the suppression of proton decay in supersymmetric extensions of the Standard Model. The naturalness of such theories is generically under less tension from LHC searches than R-parity conserving models. The flavor symmetry can also guarantee the stability of dark matter if it carries flavor quantum numbers. We outline general features of supersymmetric flavored dark matter (SFDM) models within the framework of MFV SUSY. A simple model of top flavored dark matter is presented. If the dark matter is a thermal relic, then nearly the entire parameter space of the model is testable by upcoming direct detection and LHC searches.Comment: 11 pages, 4 figure