Conveners
Gravity and Supergravity
- Huajia Wang
Gravity and Supergravity
- Yang Zhou
Gravity and Supergravity
- Yang Zhou
Gravity and Supergravity
- Minxin Huang
Gravity and Supergravity
- Song He (ITP, CAS)
Gravity and Supergravity
- Runqiu Yang (Institute of Theoretical Physics, Chinese Academy of Science)
Gravity and Supergravity
- Jiaju Zhang
Gravity and Supergravity
- Yi Pang
Gravity and Supergravity
- Wanzhe Feng
Gravity and Supergravity
- Pujian Mao
Gravity and Supergravity
- Xing Huang (University of Wisconsin-Milwaukee)
Gravity and Supergravity
- Xing Huang (University of Wisconsin-Milwaukee)
Gravity and Supergravity
- Jie Yang
I describe the Sequestered Inflation as presented in the recent works with M. Gunaydin, A. Linde, Y. Yamada and T. Wrase in 2008.01494, 2108.08491, 2108.08492. We construct supergravity models allowing to sequester the phenomenology of inflation from the Planckian energy scale physics. The procedure consists of two steps: At Step I we study supergravity models associated with string theory or...
We describe the computation of the scattering amplitudes of massive spin-2 Kaluza-Klein excitations in a gravitational theory with a single compact extra dimension, whether flat or warped. These scattering amplitudes are characterized by intricate cancellations between different contributions: although individual contributions may grow as fast as O(s^5), the full results grow only as O(s). We...
In this talk I review recent work on constructing a Penrose limit for the warped type IIB $AdS_6\times S^2\times \Sigma_2$ solutions and determining the spectrum of the Green-Schwarz string in the background.
In this talk I will start with a brief introduction of N=4 supergravity and the known results about the anomalies and divergences of N=4 supergravity in the literature. From there I will motivate the necessity for studying N=4 supergravity from the superconformal approach and discuss a systematic way to construct N=4 conformal supergravity. Then I will discuss how to use the superconformal...
The landscape of supergravity theories arising from string compactifications is highly constrained by the internal geometry. In this talk, I will argue that, rather than being a limitation of string model building, these geometric constraints reflect physical consistency conditions that delineate the landscape from the swampland. I will focus on constructions of 8d and 6d supergravity theories...
I will discuss recent progress in finding and classifying de Sitter vacua in supergravity. I will also comment on the evidence that models with de Sitter vacua with massless gravitini in the swampland.
I will describe the construction of a curious 4-derivative extension of 6D, N=(1,0) supergravity coupled to hypermultiplets whose scalar fields parametrize a quaternionic projective space. Surprisingly, we find that the inclusion of the Riemann-squared term is not allowed. Dimensional reduction of Bergshoeff-de Roo heterotic supergravity with Riemann-squared terms, on the other hand, suggests...
I will present a novel solution to the long-standing issue of obtaining de Sitter spacetimes from a pure Supergravity theory. Our model is based on the first superspace formulation of unimodular gravity, in conjunction with a (super)-Stueckelberg construction. I will then present a comparison between our model and other proposals in the literature, based on constrained superfields. Even...
Different aspects of explicit dS proposals in string theory have recently come under intense scrutiny. One key ingredient is D7-brane gaugino condensation, which can be straightforwardly treated using effective 4d supergravity. However, it is also desirable to derive the relevant scalar potential directly from a 10d Lagrangian which captures the interactions among the various localized sources...
I review new tools for the computation of Kaluza-Klein mass spectra associated with compactifications around various background geometries relevant for string theory. This includes geometries with little to no remaining symmetries, hardly accessible to standard methods. The new tools build on exceptional field theory, the duality covariant formulation of supergravity. Applications include the...
I will describe the four-derivative corrections to four-dimensional N=2 minimal gauged supergravity and show that they are controlled by two constants. Interestingly, the solutions of the equations of motion in the two-derivative theory are not modified by the higher-derivative corrections. I will use this to arrive at a general formula for the regularized on-shell action for any...
We discuss supergravity solutions that are holographically dual to supersymmetric CFTs that arise when various branes wrap a spindle. A spindle is a specific two dimensional orbifold: a two sphere with quantised conical deficits at each of the poles. We construct solutions describing the wrapped branes in gauged supergravity and then uplift them to D=10 and D=11 supergravity. Remarkably, in...
This talk reviews recent work done in collaboration with H. Jang on recently discovered new supergravity actions. Besides the standard ones, they contain new terms that become singular when auxiliary fields vanish. Constraints on the magnitude of such new terms are found by standard low-energy effective field theory consistency checks. After discussing those constraints I will present a...
In the first part of the talk I will review the relation between the anomalies in six dimensions and the Chern-Simons couplings in five. These determine in particular the central charges of string-like BPS objects that cannot be consistently decoupled from gravity, a.k.a. supergravity strings. In the second part of the talk I will review how requiring that the worldsheet theory of the...
Type IIB supergravity famously has a discrete duality group, which is an exact symmetry of the full type IIB string theory. This symmetry has potential quantum anomalies, which could render the theory inconsistent. In this talk I will describe how we computed these anomalies in recent work, and show they are nonvanishing, but remarkably, they can be cancelled by a subtle modification of the...
TBA
We study the minimal coupling of Chern-Simons gravity based on the Maxwell symmetry with massless spin-5/2 gauge fields, in three dimensions. It is shown the simplest hyper-Maxwell super-algebra and its corresponding Chern-Simons gravity, which contains a massless spin-2 fields which is coupled with a massless Majorana fermion spin-5/2. For certain combinations of osp(1/4) and sp(4)...
Supersymmetric black holes have zero temperature but their dependence on chemical potentials defines conventional thermodynamics. The phase diagram for supersymmetric AdS black holes is reminiscent of Schwarzschild-AdS, featuring a cusp, a minimal ``temperature”, and a Hawking-Page transition. This talk presents a complete phase diagram and discusses the confinement/deconfinement transition...
This talk describes how to go well beyond the perturbative correspondence between JT gravity and large N matrix models (discovered by Saad, Shenker and Stanford) to uncover detailed information about the individual microscopic states of the matrix model. This corresponds to data about the underlying microstates of the gravity system, which are crucial in the regime where the smooth spacetime...
When compact manifolds X and Y are both even dimensional, their Euler characteristics obey the Kunneth formula χ ( X × Y ) = χ ( X ) χ ( Y ) .In terms of the Betti numbers of b_p ( X ) , χ ( X ) =∑_p (-1 )^p b_p ( X ) , implying that χ(X) = 0 when X is odd dimensional. We seek a linear combination of Betti numbers, called ρ, that obeys an analogous formula ρ(X × Y ) = χ(X)ρ(Y ) when Y is odd...
Effectively generating a lower-dimensional theory of gravity or supergravity on a subsurface brane worldvolume within a noncompact transverse space requires certain special conditions for the transverse space structure. Three different scenarios emerge, depending crucially on the nature of boundary conditions that are imposed on solutions as one transversely approaches the brane worldvolume....
In this talk I will show that Newtonian gravity is not the unique non-relativistic gravity theory that can be defined by taking a limit of (matter coupled) general relativity. I will discuss several extensions of Newtonian gravity including non-relativistic gravity theories involving geometries with a higher co-dimensional foliation and with non-zero torsion. Using these extensions, I will...
In this talk I will review the dynamics of supergravity models in inflation, focusing especially on the amplification of the modes of the gravitino induced by the time-dependent background. In particular, I will show that in certain well-motivated models in supergravity, gravitinos are produced during inflation, and in their turn source scalar metric perturbations. This process modifies the...
Unconventional SUSY connects spacetime and internal symmetries, combining spin-1 gauge field and spin-1/2 matter particles in a single Lie superalgebra-valued connection. In this representation, states do not come in Bose-Fermi pairs, avoiding the doubling of particles and fields. If the local symmetry contains the Lorentz group, gravity is inevitably included, but there are no spin-3/2 or...
In this talk I will review the construction of new S-fold solutions of Type IIB string theory starting from vacua of a maximal four-dimensional supergravity with a suitable dyonic gauging.
The global properties of certain modui are analyzed.
