In recent work, Hollands, Kov\'acs and Reall have built on previous work of Wall to provide a definition dynamical black hole entropy for gravitational effective field theories (EFTs). This satisfies second law mechanics quadratic order in perturbations around stationary hole. We determine the explicit form this EFT 4d vacuum gravity including terms action with up 6 derivatives. An open questio...

Physical principles such as unitarity, causality, and locality can constrain the space of consistent effective field theories (EFTs) by imposing two-sided bounds on allowed values Wilson coefficients. In this paper, we consider that arise from requirement low-energy causality alone, without appealing to any assumptions about UV physics. We focus shift-symmetric theories, propagation around both...

We consider 2d QFTs as relevant deformations of CFTs in the thermodynamic limit. Using causality and KPZ universality, we place a lower bound on timescale characterizing onset hydrodynamics. The is determined parametrically terms temperature scale associated with deformation. This typically much stronger than \frac{1}{T} ...

Abstract is a package for the handling of standard model effective field theory (SMEFT) and low-energy (LEFT) with operators up to dimension six, both at algebraic numerical level. contains visually accessible operationally convenient repository all parameters SMEFT LEFT. This also provides information concerning symmetry categories number degrees freedom, routines that allow implement this on ...

Given a theory containing both heavy and light fields (the UV theory), standard procedure is to integrate out the field obtain an effective (EFT) for fields. Typically, EFT equations of motion consist expansion involving higher derivatives fields, whose truncation at any finite order may not be well-posed. In this paper, we address question how make sense whether they provide good approximation...

A bstract Weakly coupled regions of 4d EFTs to gravity are particularly suitable describe the backreaction BPS fundamental axionic strings, dubbed EFT in a local patch spacetime around their core. We study extension these solutions global ones, which implies probing strong coupling and provides an estimate string tension therein. conjecture that for charge generators such is always possible yie...

A bstract We study two-to-two scattering amplitudes of a scalar particle mass m . For simplicity, we assume the presence ? 2 symmetry and that is odd. consider two classes amplitudes: fully nonperturbative ones effective field theory (EFT) with cut-off scale M Using primal numerical method which allows us to impose full non-linear unitarity, construct novel bounds on various observables in ? d ...

A bstract We compute six-point string amplitudes for the scattering of one closed Ramond-Ramond state, two tachyons and gauge fields in worldvolume D-brane-anti-D-brane systems Type II superstring theories. From resulting S-matrix elements, we read off precise form couplings, including their exact numerical coefficients, corresponding highly symmetric effective field eheory (EFT) Lagrangian D-b...

We formulate Positivity Bounds for scattering amplitudes including exchange of massless particles. generalize the standard construction through dispersion relations to include presence a branch cut along real axis in complex plane Maldestam variable $s$. In general, validity these bounds require cancellation divergences forward limit amplitude, proportional $t^{-1}$ and $\log(t)$. show that thi...