Simon CaronHuot 
McGill 
Causality constraints and gravity 
Effective field theories (EFT) are widely used to parameterize longdistance effects of unknown shortdistance dynamics or possible new heavy particles. It is known that EFT parameters are not entirely arbitrary, and must obey positivity constraints if causality and unitarity are satisfied at all scales. We systematically explore those constraints from the perspective of 2 to 2 scattering processes, and show that all EFT parameters in units of the mass threshold M are bounded below and above: causality requires a sharp form of dimensional analysis scaling. Gravity is special since its treelevel energy growth already requires a UV completion; I will describe some modelindependent constraints on the graviton’s selfinteractions.


Junsei Tokuda 
Kobe University 
Quantum gravity constraints on scalar potentials from positivity bounds 
We study positivity bounds on scalar field theories coupled to gravity by assuming several properties of scattering amplitudes. We find that scalar potentials cannot be arbitrarily flat unless some new physics enters well below the Planck scale. An upper bound on the scale of new physics is found to be determined by the selfenergy. Our result provides a quantitative swampland condition for scalar potentials.
Based on 2105.01436

Katsuki Aoki 
YITP, Kyoto University 
Is the Standard Model in the Swampland? 
We study compatibility of the Standard Model of particle physics and General Relativity by means of gravitational positivity bounds, which provide a necessary condition for a lowenergy gravitational theory to be UV completable within the weakly coupled regime of gravity. In particular, we identify the cutoff scale of the Standard Model coupled to gravity by studying consistency of lightbylight scattering. While the precise value depends on details of the Pomeron effects in QCD, the cutoff scale reads $10^{16}$GeV if the singlePomeron exchange picture works well up to this scale. We also demonstrate that the cutoff scale is lowered to $10^{13}$GeV if we consider the electroweak theory without the QCD sector.
Based on 2104.09682

Matsuo Sato 
Hirosaki University 
Backgrounds of All the Five Tendimensional Supergravities from String Geometry Theory 
String geometry theory is a candidate of the nonperturbative formulation of string theory. In case of a perturbative string theory, string backgrounds are treated as external fields. Whereas a nonperturbative string theory needs to be able to describe dynamics of the string backgrounds in order to determine a string vacuum. In this talk, we show that all the type IIA, IIB, SO(32) type I, and SO(32) and $E_8 \times E_8$ heterotic supergravity backgrounds are embedded in configurations of the fields of a single string geometry model. Especially, we show that the configurations satisfy the equations of motion of the string geometry model in $\alpha' \to 0$ if and only if the embedded string backgrounds satisfy the equations of motion of the corresponding five supergravities, respectively. This means that classical dynamics of the string backgrounds are described as a part of classical dynamics in string geometry theory. This fact supports the conjecture that string geometry theory is a nonperturbative formulation of string theory. Furthermore, we define an energy of the configurations in the string geometry model because they do not depend on the string geometry time. A string background can be determined by minimizing the energy.
Based on 2102.12779

Gustavo Arciniega 
Universidad Nacional Autónoma de México 
A unified geometric description of the Universe: from inflation to latetime acceleration without a cosmological constant 
We present a cosmological model arising from a gravitational theory with an infinite tower of higherorder curvature invariants that can reproduce the entire evolution of the Universe: from inflation to latetime acceleration, without invoking a scalar inflaton nor a cosmological constant. The theory is Einsteinianlike. The field equations for a FLRW metric are secondorder and can reproduce an acceleration that is in agreement with the SuperNovae data collection. Our results force us to reinterpret the nature of dark energy, becoming a mechanism that is inherited solely from the geometry of spacetime.


Silvia Nagy 
Queen Mary University of London 
The double copy for asymptotic symmetries 
I will describe the construction of a subset of the asymptotic symmetries in gravity from YangMills symmetries via the double copy correspondence. This is based on the study of certain residual symmetries of the selfdual sectors of YangMills and gravity, which additionally gives some interesting connections between perturbative and nonperturbative aspects of the double copy. Finally, we use the DC to describe some symmetries which (to our knowledge) have not yet been presented in the asymptotics literature.
Based on 2102.01680

Keisuke Izumi 
KMI & Dept. of Math., Nagoya U. 
Area bound for surfaces in general relativity 
On asymptoticallyflat maximal spacelike 3surfaces, the area of minimal 2surfaces is suppressed by that of Schwarzschild spacetime. Since, on timesymmetric 3surface, an apparent horizon becomes a minimal 2surface, this upper bound must show the maximum of entropy. The inequality expressing it is called Riemannian Penrose inequality. In this talk, the inequality is generalized for surfaces in generic gravitational field where the gravity is moderately strong or even weak. It must be helpful to understand the thermodynamics properties of gravitational theory not relied on black holes.
Based on 2101.03860

Oem Trivedi 
Ahmedabad University 
Swampland conjectures and single field inflation in modified cosmological scenarios 
Swampland Conjectures have attracted quite some interest in the Cosmological Community. They have been shown to have wide ranging implications , like Constraints on Inflationary Models, Primordial Black Holes, Dark Energy to name a few. Particularly, their implications on Single Field Inflationary Models in General Relativity Based Cosmology has gathered huge attention. Swampland Conjectures in their usual form have been shown to be incompatible with these kind of Single Field Models, or have been shown to induce severe Fine Tuning in these Inflationary Models for them to be consistent with the Conjectures. In this work, we show that a Large Class of Single Field Inflationary Models can in fact bypass the problems faced by Inflationary Paradigms in GR Based Cosmology. We use the Exact Solution Approach to Inflation for the same purpose and show how String Theoretic Motivations of the Swampland Conjectures can be in perfect symphony with various Single Field Inflationary Models in Modified Cosmological Scenarios.
Based on 2008.05474

Maurice van Putten 
Sejong University 
H0tension: a whisper of unstable de Sitter by Tduality in the Friedmann scale factor? 
H0tension between the Local Distance Ladder and LambdaCDM increasingly suggests that the latter produces a systematic underestimate of the Hubble parameter by the assumed stable de Sitter state in the future. This assumption may be false, anticipated by the Swampland conjectures. We present a theory of cosmological evolution with unstable de Sitter (UdS) in the future, which otherwise effectively reduces to LambdaCDM in the past. It derives from a nonlocal correction to the propagator in cosmological spacetime due to the Hubble horizon. It renders de Sitter unstable, identified with a Tduality invariant D(a)+D(kappa)=2 in the Friedmann scale factor a, where D(a)=q is curvature given by the deceleration parameter q in LambdaCDM and kappa=1/a. In confrontation with observations, it quantitatively explains H0tension by a turning point in H(z) around redshift zero, consistent with the age of the Universe measured independently by the ages of globular clusters. (Based on van Putten, 2020, MNRAS Lett., 491, L6).


Mitsutoshi Fujita 
Sun YatSen University 
GinzburgLandau effective action for a fluctuating holographic superconductor 
Under holographic prescription for SchwingerKeldysh closed time contour for nonequilibrium system, we consider fluctuation effect of the order parameter in a holographic superconductor model. Near the critical point, we derive the timedependent GinzburgLandau effective action governing dynamics of the fluctuating order parameter. In a semianalytical approach, the timedependent GinzburgLandau action is computed up to quartic order of the fluctuating order parameter, and first order in time derivative.

Ryota Watanabe 
Osaka University 
Bulk reconstruction of metrics inside black holes by complexity 
We provide a formula to reconstruct bulk spacetime metrics inside blackholes by the time dependence of complexity in the dual quantum field theory, based on thecomplexity=volume (CV) conjecture in the holographic duality.
Based on 2103.13186

Hayato Kanno 
Yukawa Institute for Theroretical Physics, Kyoto University 
Anomaly and Superconnection 
We study anomalies of fermion with spacetime dependent mass. We calculate anomalies, which associate with the $U(N)\times U(N)$ chiral symmetry for even dimension and $U(N)$ flavor symmetry for odd dimension, using Fujikawa method. We show these anomalies can be written by superconnection. In particular, we focus on vectorlike $U(1)$ part of the anomalies in this talk.These results can be applied to some general systems with interfaces and boundaries. They are also useful to some index theorems, such as APS index theorem. In the last part of this talk, the relation between this anomaly and string theory is discussed.This talk is based on [arXiv:2106.01591], work with Shigeki Sugimoto.
Based on 2106.01519

Ryo Yokokura 
KEK 
Global 4group symmetry of axion electrodynamics in a gapped phase 
We study higherform symmetries in (3+1)dimensional axion electrodynamics where the axion and photon are massive. In the lowenergy limit, we establish a topological field theory which describes topological excitations with an axionphoton coupling. The higherform symmetries are specified in the topological field theory. By using intersections of symmetry generators, we argue that the worldvolume of an axionic domain wall is topologically ordered, and we discuss the underlying 4group structure.

Tadashi Okazaki 
Durham University 
Fermigas correlators of ADHM theory and triality symmetry 
We analytically study the Fermigas formulation of sphere correlation functions of the Coulomb branch operators for 3d $\mathcal{N} = 4$ ADHM theory with a gauge group $U(N)$, an adjoint hypermultiplet and $l$ hypermultiplets which can describe a stack of $N$ M2branes at $A_{l−1}$ singularities. We find that the leading coefficients of the perturbative grand canonical correlation functions are invariant under a hidden triality symmetry conjectured from the twisted Mtheory. The triality symmetry also helps us to fix the nexttoleading corrections analytically.


1: Shoto Aoki 
Osaka University 
Chiral fermion on curved domainwall 
We consider a massive fermion system having a curved domainwall embedded in a square lattice. As already reported in condensed matter physics, the massless chiral edge modes appearing at the domainwall feel "gravity" through the induced spin connections. In this work, we embed $S^1$ and $S^2$ domainwall into Euclidean space and show how the gravity is detected from the spectrum of the Dirac operator. We also discuss how we can understand gravitational anomaly inflow and index theorem with nontrivial curvature of the domainwall.

2: Yui Hayashi 
Chiba University 
Reconstructing propagators of confined particles in the presence of complex singularities 
Propagators of confined particles, especially the Landaugauge gluon propagator, may have complex singularities as suggested by recent numerical works as well as several theoretical models, e.g., motivated by the Gribov problem. In this presentation, we discuss formal aspects of propagators with complex singularities in reconstructing Minkowski propagators starting from Euclidean propagators by the analytic continuation. We rigorously derive properties to be satisfied by the relevant propagators in the presence of complex singularities. As a result, the analyticallycontinued Wightman function is holomorphic in the tube, and the Lorentz symmetry and locality are kept valid. In contrast, the reconstructed Wightman function violates the temperedness and the positivity condition. Finally, we consider implications on a possible quantum mechanical interpretation and confinement mechanism.
Based on 2105.07487

3: Takuya Hirose 
Osaka City University 
Nonvanishing finite scalar mass in flux compactification 
We study possibilities to realize a nonvanishing finite Wilson line (WL) scalar mass in flux compactification. Generalizing loop integrals in the quantum correction to WL mass at oneloop, we derive the conditions for the loop integrals and mode sums in oneloop corrections to WL scalar mass to be finite. We further guess and classify the fourpoint and threepoint interaction terms satisfying these conditions. As an illustration, the nonvanishing finite WL scalar mass is explicitly shown in a six dimensional scalar QED by diagrammatic computation and effective potential analysis. This is the first example of finite WL scalar mass in flux compactification.
Based on 2104.01779

4: Shoichi Kawamoto 
National Tsing Hua University 
Quantum entanglement of accelerated particles and holographic dual 
A pair of entangled particles in strongly coupled gas is analyzed by use of the holographic method. When the particles are in uniform acceleration, I analyze the fluctuations in the gravity side. Based on the analysis, I study the time evolution of the entanglement of these particles from the holographic point of view.

5: Isao Kishimoto 
SanyoOnoda City University 
On numerical universal solutions in agauge in open string field theory 
We construct numerical solutions in AsanoKato's $a$gauge in open string field theory, which correspond to KudrnaSchnabl's double brane and ghost brane solutions as well as the tachyon vacuum solution in the Siegel gauge. We evaluate gauge invariants (energy and gauge invariant overlap) for obtained solutions up to the truncation level 20. Except for those of the tachyon vacuum, we find that they are relatively unstable for various values of $a$, unlike the case of the Siegel gauge ($a=0$), where we investigated them around TakahashiTanimoto's identitybased solution in the previous work [KishimotoTakahashi(2020)].

6: Takayasu Kondo 
Tokyo Institute of Technology 
WKB periods for higher order ODE and TBA equations 
We study the WKB periods for the $(r+1)$th order ordinary differential equation (ODE) which is obtained by the conformal limit of the linear problem associated with the $A^{(1)}_r$ affine Toda field equation. We compute the quantum corrections by using the PicardFuchs operators. The ODE/IM correspondence provides a relation between the Wronskians of the solutions and the Yfunctions which satisfy the thermodynamic Bethe ansatz (TBA) equation related to the Lie algebra $A_r$. For the quadratic potential, we propose a formula to show the equivalence between the logarithm of the Yfunction and the WKB period, which is confirmed by solving the TBA equation numerically.
Based on 2104.13680

7: Ken Matsuno 
Osaka City University Advanced Mathematical Institute 
Hawking radiation from squashed KaluzaKlein black holes with a generalized uncertainty principle 
We consider the Hawking radiation by the tunneling of charged fermions and charged scalar particles from the fivedimensional charged static squashed KaluzaKlein black hole based on the generalized uncertainty principle with a minimal measurable length. We derive corrections of the Hawking temperature to general relativity, which are related to the energy of the emitted particle, the size of the extra dimension, the charge of the black hole and the quantum effect predicted by the generalized uncertainty principle. It is shown that the quantum correction may slow down the increase of the Hawking temperature, which may lead to the thermodynamic stable remnant of the order of the Planck mass after the evaporation of the squashed KaluzaKlein black hole.
Based on 2104.00891

8: Kaoru Miyamoto 
Kitasato University 
Threedimensional generalization of vortex equation. 
The Taubes equation is a twodimensional vortex equation on hyperbolic plane, whose solutions are solved exactly. This equation has a completely geometrical interpretation developed by Baptista and the construction can be generalized to threedimensional setup. In this work, we propose threedimensional version of the Taubes equation constructed by analogy of Baptista’s method and explore its solutions. (Joint work with A. Nakamula)

9: Akihiro Miyata 
The University of Tokyo, Komaba 
Evaporation of black holes in flat space entangled with an auxiliary universe 
We study a thermofield double type entangled state on two disjoint universes A and B, where one of the universes is asymptotically flat containing a black hole. As we increase the entanglement temperature, this black hole receives backreaction from the stress energy tensor of the state. This results in lengthening of the wormhole region in the black hole interior, and decreasing of its horizon area, both of which are key features of an evaporating black hole. We then compute the entanglement entropy on the universe A through the island formula, and argue that it naturally follows the Page curve of an evaporating black hole in flat space. We also study the effects of local operations in the gravitating universe with the black hole. We find that they accelerate the evaporation of the black hole, therefore disrupt the entanglement between two universes. Furthermore, we observe that depending on whether the operation can be regarded as an LOCC or not, the behavior of the entanglement entropy changes. In particular, when the operation is made neither in the entanglement wedge of the radiation system or that of the black hole, the transition between the island phase and the noisland phase can happen multiple times.
Based on 2104.00183

10: Takeshi Morita 
Shizuoka University 
Numerical bootstrap method for quantum physics 
We apply numerical bootstrap method to quantum mechanics and matrix models. We show that this method may be very powerful in largeN gauge theories for several quantities. On the other hand, this method has some serious problems in several situations. In this poster, I will introduce these advantages and disadvantages of the bootstrap method.

11: Yuta Nasuda 
Tokyo University of Science 
Nonexactness of SWKB quantization condition and the higher order corrections 
The SWKB quantization condition is an exact quantization condition for the class of conventional shapeinvariant potentials.In this poster, we focus on the condition for other classes of solvable quantummechanical systems: multiindexed systems, KreinAdler systems, and conditionally exactly solvable systems.The condition equation is not exactly but approximately satisfied.We also discuss higher order corrections of the SWKB condition for those cases and the connection with some features of the quantummechanical systems.
Based on 2004.04927

12: Nitika Sachdeva 
Bhagwan Parshuram Institute of Technology, Guru Gobind Singh Indraprastha University 
Binomial coefficients and Arithmetic Progression in an Alternating Series with its interpretation in Vector Space 
A series is defined using terms of arithmetic sequence taken along with binomial coefficients nCr. By deriving it in all the subsequent sections of Pascal’s hexagon, the series is extended for nCr where n, r belong to R. Further, it is analyzed in a vector space and is found to be a subspace of it. The series is studied as a scalar product of threedimensional vectors where some of the findings are generalized for ndimensions.

13: Yoshiki Sato 
NCTS 
Complexity in a moving mirror model 
The moving mirror model is a simple CFT model and mimics a black hole. If the moving mirror model is a holographic CFT, we can apply the AdS/CFT correspondence. In this setup, we study the subregion complexity motivated by the fact that the complexity can detect a late time behaviour of the black hole in contrast to the entanglement entropy.

14: Yotaro Sato 
Kavli IPMU 
Monodromies and Anomalies in N=2 Heterotic String 
The cancellation mechanism of global anomalies in string theories is hardly known in terms of the internal CFT. This is one approach to this problem using N=2 supersymmetry.Heterotic compactifications with N=2 supersymmetry have almost the same story as SeibergWitten theory for gauge theories. We showed that the monodromy transformations are realized by lattice isometries of the internal lattice CFT, and the unphysicalness of the monodromy transformations is equivalent to the cancellation of Witten anomaly.

15: Lakhdar Sek 
University of biskra 
2+1 Dimensional relativistic oscillator under a uniform magnetic field in noncommutative space 
In this paper, we study the thermodynamic properties of KG oscillator under the effect of an external magnetic field in noncommutative space, where the exact energy eigenvalues and normalized wave function are obtained analytically.

16: Taichi Shimizu 
Tokyo University of Science 
Analysis on longevity of Qballs by dynamical simulations 
We study the time evolution of Qballs in the gravitymediated SUSY breaking model, in terms of longterm dynamical simulations with the symplectic integrator. We examine whole life of Qballs such as emergence, formation and decay or collapse of the each ball. As a result, we observe that the Qballs are metastable and have a finite longevity, though they possess the conserved $U(1)$ charge. We discuss property of an effective interaction concerning growth or decay of the Qball formulation and how the longevity is attained with it.

17: Shreya Shukla 
University of California, Irvine 
Metaplectic flavor symmetries from magnetized tori 
We revisit the flavor symmetries arising from compactifications on tori with magnetic background fluxes. Using Euler's Theorem, it is possible derive closed form analytic expressions for the Yukawa couplings that are valid for arbitrary flux parameters. Furthermore, we show that the modular transformations for even and odd units of magnetic flux, M, and show that they give rise to finite metaplectic groups the order of which is determined by the least common multiple of the number of zeromode flavors involved. Unlike in models in which modular flavor symmetries are postulated, in this approach they derive from an underlying torus. This allows us to retain control over parameters, such as those governing the kinetic terms, that are free in the bottomup approach, thus leading to an increased predictivity.
Based on 2102.11286

18: Mitsuyo Suzuki 
Osaka City University 
UVfiniteness of supersymmetric gradient flow in N=1 SQCD 
I will discuss perturbation theory of supersymmetric gradient flow in 4D N = 1 SQCD. The perturbation theory consists of a perturbative expansion of 4D SQCD and an iterative expansion of the flow equation. In particular, I will discuss the 1loop calculations of the flowed correlation functions.

19: Maki Takeuchi 
Kobe University 
Proof of index theorem on $T^2/Z_2$ orbifold with magnetic flux 
We obtained a general formula that gives the number of chiral zero modes on $T^2/Z_N$ orbifold with a magnetic flux background. However it is not clear whether this formula is an index theorem or not. In the case of $T^2/Z_2$ orbifold with a magnetic flux background, we will directly check this formula by deriving it from the trace formula.

20: Takanao Tsuyuki 
Kogakuin University 
Minkowski spacetime and nonRicciflat compactification in heterotic supergravity 
We compactify the tendimensional spacetime in heterotic supergravity leaving fourdimensional Minkowski spacetime. We search for nonsupersymmetric, nonRicciflat solutions of the equations of motion and the condition for anomaly cancellation. By assuming that the extradimensional spaces are products of 2manifolds, three types of solutions are found. They are $S^2\times T^2 \times H^2/\Gamma$, $S^2\times H^2/\Gamma \times H^2/\Gamma$ and $S^2\times S^2 \times H^2/\Gamma$, where $H^2/\Gamma$ denotes a compact hyperbolic manifold. The metrics can be written explicitly for all of them, and they can be applied for phenomenology.
Based on 2106.03625

21: Taizan Watari 
Kavli IPMU 
W=0 Complex Structure Moduli Stabilization CMtype K3 x K3 Orbifolds 
Flux compactification of Type IIB string or Ftheory generically leaves vacuum energy of order $M_{Pl}^4$ and gravitino mass of order $M_{Pl}$, where $M_{Pl}$ is the Planck scale. Whether there is a mechanism or condition that yields small value of those in flux compactification (W=0) is an important input on such issues as volume stabilization, inflation, supersymmetric grand unification and supersymmetric dark matter. $\;$ It is known that W=0 flux is available when the target space has complex structure of CM (complex multiplication) type. We discuss construction of CalabiYau 4folds with CMtype complex structure in the form of K3 x K3 orbifilds, and study consequences in the lowenergy physics. $\; $ This presentation is based on a joint work with K. Kanno.
Based on 2012.01111

22: Shota Yanai 
Tokyo University of Science 
Multilayered $Q$compactons in a nonlinear sigma model 
We study compact $Q$ball, $Q$shell solutions in a nonlinear sigma model with target space $\mathbb{C}P^N$. The multicomponenttype models with Vshaped potentials possess multilayered compact $Q$ball and shell solutions. We have found the $n$folded $Q$ball/shell, or $n$layered $Q$ball/shell (harboring) solutions. The model possesses solutions with wide variety in their spatial structure. In this presentation, we show some examples and discuss the potential physical applications.

