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مبادئ الحكم في الصين القديمة
يتناول كتاب (مبادئ الحكم في الصين القديمة) والذي قامه بتأليفه (وي تشينغ) في حوالي (211) صفحة من القطع المتوسط موضوع (تاريخ الصين قديم) مستعرضا المحتويات التالية : قبل أكثر من ألف وربعمائة عام، أصدر الإمبراطور تاي تسونغ إمبراطور أسرة تانغ الملكية (618-907) مرسوما بأن يجمع أربعة من أشهر علماء الصين وسياسييها وأمهرهم وقتها المعارف التاريخية حول مبادئ الحكم الإمبراطوري من الكتب الكلاسيكية القديمة الستة، والمجموعات التاريخية الأربع، والمئات من مؤلفات المدارس الفكرية الصينية، وأن يرتبوها ويستخرجوا منها الدروس الاكثر اهمية حول تهذيب النفس وإصلاحها، وإدارة العائلة، والحكم الجيد للبلاد، وسبل جلب السلام للعالم. وكانت النتيجة مجموعة عنوانها \"تشيونشو تشيياو\" التي أقتبست بعناية من أربعة عشر ألف كتاب، وتسع وثمانين ألف مخطوطة من الكتابات القديمة، بإجمالي خمسمائة ألف فقرة مكتوبة، تغطي خمسة وشتين صنفا من الكتب. وقد ساعد هذا الكتاب الإمبراطور تاي سونغ والكثير من الأباطرة من بعده في أمور الحكم، ويعود الفضل في تحقيق الرخاء والسلام في المراحل اللاحقة بالصين القديمة بنسبة كبيرة إلى هذا الكتاب.
BOOK
Notes on flat-space limit of AdS/CFT
A
bstract
Different frameworks exist to describe the flat-space limit of AdS/CFT, include momentum space, Mellin space, coordinate space, and partial-wave expansion. We explain the origin of momentum space as the smearing kernel in Poincare AdS, while the origin of latter three is the smearing kernel in global AdS. In Mellin space, we find a Mellin formula that unifies massless and massive flat-space limit, which can be transformed to coordinate space and partial-wave expansion. Furthermore, we also manage to transform momentum space to smearing kernel in global AdS, connecting all existed frameworks. Finally, we go beyond scalar and verify that
VV
O
maps to photon-photon-massive amplitudes.
Journal Article
Offshoring Pollution while Offshoring Production?
Research summary: We examine the role of firm strategy in the global effort to combat pollution. We find that U.S. plants release less toxic emissions when their parent firm imports more from low‐wage countries (LWCs). Consistent with the Pollution Haven Hypothesis, goods imported by U.S. firms from LWCs are in more pollution‐intensive industries. U.S. plants shift production to less pollution‐intensive industries, produce less waste, and spend less on pollution abatement when their parent imports more from LWCs. The negative impact of LWC imports on emissions is stronger for U.S. plants located in counties with greater institutional pressure for environmental performance, but weaker for more‐capable U.S. plants and firms. These results highlight the role of local institutions and firm capability in explaining firms' offshoring and environmental strategies. Managerial summary: Using confidential trade, production, and pollution data of more than 8,000 firms and 18,000 plants from the U.S. Census Bureau for years 1992–2009, we find that U.S. plants release less toxic emissions when their parent firm imports more from low‐wage countries (LWCs). In addition, goods imported by U.S. firms from LWCs are in more pollution‐intensive industries. U.S. plants shift production to less pollution‐intensive industries, produce less waste, and spend less on pollution abatement when their parent imports more from LWCs. However, not all U.S. firms choose to “offshore pollution.” U.S. plants located in counties with greater institutional pressure for environmental performance offshore more, but more‐capable U.S. plants and firms offshore less. Copyright © 2017 John Wiley & Sons, Ltd.
Journal Article
Heavy-light bootstrap from Lorentzian inversion formula
A
bstract
We study heavy-light four-point function by employing Lorentzian inversion formula, where the conformal dimension of heavy operator is as large as central charge
C
T
→ ∞
. We implement the Lorentzian inversion formula back and forth to reveal the universality of the lowest-twist multi-stress-tensor
T
k
as well as large spin double-twist operators
O
H
O
L
n
′
,
J
′
. In this way, we also propose an algorithm to bootstrap the heavy- light four-point function by extracting relevant OPE coefficients and anomalous dimensions. By following the algorithm, we exhibit the explicit results in
d
= 4 up to the triple-stress- tensor. Moreover, general dimensional heavy-light bootstrap up to the double-stress-tensor is also discussed, and we present an infinite series representation of the lowest-twist double- stress-tensor OPE coefficient. Exact expressions of lowest-twist double-stress-tensor OPE coefficients in
d
= 6
,
8
,
10 are also obtained as further examples.
Journal Article
Causality constraints on corrections to Einstein gravity
A
bstract
We study constraints from causality and unitarity on 2 → 2 graviton scattering in four-dimensional weakly-coupled effective field theories. Together, causality and unitarity imply dispersion relations that connect low-energy observables to high-energy data. Using such dispersion relations, we derive two-sided bounds on gravitational Wilson coefficients in terms of the mass
M
of new higher-spin states. Our bounds imply that gravitational interactions must shut off uniformly in the limit
G
→ 0, and prove the scaling with
M
expected from dimensional analysis (up to an infrared logarithm). We speculate that causality, together with the non-observation of gravitationally-coupled higher spin states at colliders, severely restricts modifications to Einstein gravity that could be probed by experiments in the near future.
Journal Article
Helicity basis for three-dimensional conformal field theory
A
bstract
Three-point correlators of spinning operators admit multiple tensor structures compatible with conformal symmetry. For conserved currents in three dimensions, we point out that helicity commutes with conformal transformations and we use this to construct three-point structures which diagonalize helicity. In this helicity basis, OPE data is found to be diagonal for mean-field correlators of conserved currents and stress tensor. Furthermore, we use Lorentzian inversion formula to obtain anomalous dimensions for conserved currents at bulk tree-level order in holographic theories, which we compare with corresponding flat-space gluon scattering amplitudes.
Journal Article
Gravity and a universal cutoff for field theory
A
bstract
We analyze the one-loop effects of massive fields on 2-to-2 scattering processes involving gravitons. It has been suggested that in the presence of gravity, any local effective field theory description must break down at the “species scale”. We first observe that unitarity and analyticity of the amplitude indeed imply a species-type bound
G
Λ
d
−2
N
≤
O
(1), where
N
counts parametrically light species and Λ is an energy scale above which new unknown ingredients must modify the graviton amplitude. To clarify what happens at this scale, we contrast the partial wave decomposition of calculated amplitudes with that of some ultraviolet scenarios: string theory and strongly interacting Planck-scale physics. Observing that the latter exhibit a markedly stronger high-spin content, we define nonperturbatively the
high-spin onset
scale Λ
o
, which coincides with the string scale and higher-dimensional Planck scale in respective examples. We argue that, generally, no local field description can exist at distances shorter than 1/Λ
o
.
Journal Article
Effective field theory bootstrap, large-N χPT and holographic QCD
A
bstract
We review the effective field theory (EFT) bootstrap by formulating it as an infinite-dimensional semidefinite program (SDP), built from the crossing symmetric sum rules and the S-matrix primal ansatz. We apply the program to study the large-
N
chiral perturbation theory (
χ
PT) and observe excellent convergence of EFT bounds between the dual (rule-out) and primal (rule-in) methods. This convergence aligns with the predictions of duality theory in SDP, enabling us to analyze the bound states and resonances in the ultra-violet (UV) spectrum. Furthermore, we incorporate the upper bound of unitarity to uniformly constrain the EFT space from the UV scale
M
using the primal method, thereby confirming the consistency of the large-
N
expansion. In the end, we translate the large-
N χ
PT bounds to constrain the higher derivative corrections of holographic QCD models.
Journal Article
The no boundary density matrix
A
bstract
We discuss a no-boundary proposal for a subregion of the universe. In the classical approximation, this density matrix involves finding a specific classical solution of the equations of motion with no boundary. Beyond the usual no boundary condition at early times, we also have another no boundary condition in the region we trace out. We can find the prescription by starting from the usual Hartle-Hawking proposal for the wavefunction on a full slice and tracing out the unobserved region in the classical approximation. We discuss some specific subregions and compute the corresponding solutions. These geometries lead to phenomenologically unacceptable probabilities, as expected.
We also discuss how the usual Coleman de Luccia bubble solutions can be interpreted as a possible no boundary contribution to the density matrix of the universe. These geometries lead to local (but not global) maxima of the probability that are phenomenologically acceptable.
Journal Article