REVIEW 92 cited by
On the Geometry of the String Landscape and the Swampland
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
read the original abstract
We make a number of conjectures about the geometry of continuous moduli parameterizing the string landscape. In particular we conjecture that such moduli are always given by expectation value of scalar fields and that moduli spaces with finite non-zero diameter belong to the swampland. We also conjecture that points at infinity in a moduli space correspond to points where an infinite tower of massless states appear, and that near these regions the moduli space is negatively curved. We also propose that there is no non-trivial 1-cycle of minimum length in the moduli space. This leads in particular to the prediction of the existence of a radially massive partner to the axion. These conjectures put strong constraints on inflaton potentials that can appear in a consistent quantum theory of gravity. Our conjectures are supported by a number of highly non-trivial examples from string theory. Moreover it is shown that these conditions can be violated if gravity is decoupled.
Forward citations
Showing 60 of 92 Pith papers that cite this
-
String Theory from Maximal Supersymmetry
The open string Veneziano amplitude emerges as the unique tree-level completion of N=4 super Yang-Mills when supersymmetry, factorization, and positivity are imposed.
-
(Super)$\,$Gravity from Positivity
Positivity of scattering amplitudes forces weakly coupled EFTs of a massive spin-3/2 particle to include gravity, and for charged states a gauged photon with g=2 and WGC-saturating charge.
-
Towers of Operators in CFTs and Convexity Bounds at Large Charge
In 3d CFTs with moduli spaces, the projected large-charge tower obeys the convexity bound α0≤0, while the leading slope α1 has no universal bound besides α1≥0.
-
The Dark Dimension meets the Axiverse
Dark dimension dark matter can evade decay constraints if N≳50 axion KK towers share the tower energy, diluting Standard Model energy injection by roughly 1/N.
-
Integral Scaling for EFT Strings from the Bottom-Up
Under brane-taxonomy axioms and an n_e≤7 homogeneity bound, integral scaling with w≤3 is an exhaustive finite consequence for all EFT string candidates in 4d N=1 moduli slices.
-
EFT (String) Tower Building
Assuming the Integral Scaling Relation and the Emergent String Conjecture, the Kähler potential fixes the UV tower spectrum, and every admissible degree-≤7 tower polytope is a slice of the M-theory G2 polytope.
-
Phase-resolved field-space distance criteria in ekpyrotic, bouncing and cyclic cosmologies
Proposes phase-resolved invariant path-length criteria and a master formula for lower bound on ε_ek in ekpyrotic cosmologies, using BKL suppression and conversion windows as constraints.
-
Wormholes and the imaginary distance bound
Wormhole solutions with imaginary scalars set an Imaginary Distance Bound on analytic continuation of couplings, enforced by stringy effects that coincide with WGC and KSW in special cases.
-
Taxonomy of Instanton Corrections in Infinite Distance Limits
The Schwinger integral over light towers captures precisely those instantons with actions in the window (Λ_sp/M_light)^{-1} ≤ S_inst ≤ Λ_sp/M_light.
-
Extraordinary Surface Criticalities for Interacting Fermions
Exact infrared solutions for surface criticalities in the Gross-Neveu-Yukawa model encode fermionic anomalies in surface dynamics and reveal emergent structures linked to a defect version of the CFT distance conjecture.
-
Alice in Warpland: KK modes, Warped Compactifications and the Swampland
In codimension-one warped compactifications with exponential potentials, the KK mass decay rate λ_KK is reduced by warping but still satisfies the Sharpened Distance Conjecture precisely when the higher-dimensional po...
-
All $2D$ generalised dilaton theories from $d\geq 4$ gravities
Generic 2D Horndeski theories arise from dimensional reduction of d≥4 gravities, yielding a Birkhoff theorem for quasi-topological gravities where static spherically symmetric solutions satisfy g_tt g_rr = -1 and are ...
-
Tame Complexity of Effective Field Theories in the Quantum Gravity Landscape
Effective field theories consistent with quantum gravity are conjectured to have uniformly bounded 'tame complexity', a quantitative measure of the information needed to specify them.
-
Effective geometrodynamics for renormalization-group improved black-hole spacetimes in spherical symmetry
RG-improved black hole spacetimes with scale-dependent gravitational coupling are derived as vacuum solutions to 2D Horndeski master field equations, embedding prior works and exposing implementation discrepancies.
-
The CFT Distance Conjecture and Tensionless String Limits in $\mathcal N=2$ Quiver Gauge Theories
In N=2 SU quiver theories the large-N Hagedorn temperature depends only on quiver length for linear cases and equals that of N=4 SYM for holographic quivers, with a universal lower bound of 1/sqrt(2) on the exponentia...
-
Towards the Non-Perturbative Completion of 4d N=1 Effective Theories of Gravity
Small-volume regimes of flop curves in 4d N=1 F-theory require non-perturbative states—blow-up moduli and D3-string excitations—to complete the locally enhanced N=2 spectrum.
-
The Boundary of Symmetric Moduli Spaces and the Swampland Distance Conjecture
For locally symmetric moduli spaces satisfying a compactifiability constraint, every infinite-distance limit produces an exponentially light tower of states, with decay rates forming the convex hull of the weights of ...
-
Higher Structures on Boundary Conformal Manifolds: Higher Berry Phase and Boundary Conformal Field Theory
A 2-form higher Berry connection on boundary conformal manifolds is defined from boundary-condition-changing operator OPE phases; it reproduces the B-field and WZ term in string theory examples.
-
An M-theory dS maximum from Casimir energies on Riemann-flat manifolds
Explicit scale-separated dS5 maximum in M-theory on a 6D Riemann-flat manifold with vacuum energy 10^{-8} in Planck units, obtained via Casimir energies and fluxes.
-
Linear and nonlinear supersymmetry in field and string theory
Consistency criteria for constrained superfields, a gravitino energy and particle-production puzzle, the unique leading-order massive spin-2 to supergravity coupling, and a twisted Scherk-Schwarz orientifold with full...
-
Co-Scaling and Alignment of Electric and Magnetic Towers
Electric and magnetic BPS towers in 5d supergravity are conjectured to co-scale and align, and a new S-map is conjectured to characterize the magnetic infinity cone of a Calabi-Yau threefold.
-
Holographic Time Crystals vs Penrose
In spherically symmetric Einstein-scalar gravity with conformally invariant boundary conditions, the AdS Penrose inequality holds exactly when a positive mass theorem holds, ruling out neutral, non-rotating holographi...
-
The Double EFT Expansion in Quantum Gravity
Quantum gravity EFT actions organize higher-curvature corrections into a field-theoretic expansion suppressed by the lightest new mass and a quantum-gravitational expansion suppressed by the species scale.
-
EFT & Species Scale: Friends or foes?
A detailed one-loop derivation shows that the species scale can be computed consistently with infinite convergent towers of states, resolving an apparent tension between infinite towers and effective field theory.
-
String stars in $d\geq 7$
String stars in d≥7 exist as higher-dimensional counterparts of Horowitz-Polchinski solutions, with perturbative d=7 solutions and normalizable candidates in d>7.
-
Asymptotics of 5d Supergravity Theories and the Emergent String Conjecture
All infinite distance limits in 5d N=1 supergravity vector moduli space are either unique-vector limits (6d decompactification) or unique-tensor limits (emergent string), under a weak BPS completeness assumption.
-
Banks-Zaks Stabilisation of Non-SUSY Strings
In non-supersymmetric strings, scale-separated AdS vacua can form when the accidentally small one-loop vacuum energy from massive states balances the two-loop Casimir energy of massless states, a Banks-Zaks-like fixed point.
-
Approximate Symmetries and Gravity
The authors propose a 'Swampland Symmetry Conjecture' requiring local symmetry-violating operators to act faster than thermal black holes, and show that the Weak Gravity Conjecture typically enforces this bound in gau...
-
Mild Non-Gaussianities under Perturbative Control from Rapid-Turn Inflation Models
Leading-order exponential contributions to higher-order correlators in rapid-turn inflation cancel exactly in the in-in formalism, leaving order-one non-Gaussianity and preserving perturbative control.
-
Fundamental Forces and Scalar Field Dynamics in the Early Universe
The paper shows that generalized scalar weak gravity conjectures imply the parameter conditions for early-universe scalar condensates to fragment into solitonic lumps, which could form dark matter or primordial black holes.
-
Consistency of the Standard Model Effective Field Theory
Causality and analyticity of scattering amplitudes imply 27 independent bounds on the dimension-eight bosonic operators of the Standard Model Effective Field Theory.
-
Kaluza-Klein tower thresholds and scheme dependence of the species scale
Leading KK-tower local corrections to four-derivative gravity are regulator-dependent EFT matching data, while log N terms are universal within proper-time cutoffs, so species-scale definitions match only parametrically.
-
Distance-Higuchi Bounds on Inflationary Field Ranges and Lifetimes
A quasi-de Sitter inflationary phase cannot remain free of spin-2 ghosts for longer than the smaller of a classical slow-roll time and a quantum-diffusion time, both polynomial in 1/H.
-
Tetra-quadric CY Threefold and Assisted Fibre Inflation
Three Kähler moduli on a tetra-quadric CY orientifold collectively drive assisted fibre inflation with individual shifts near 2.2 M_p instead of the effective 5.7 M_p.
-
IR Black Hole Instabilities Trigger Species-Scale Particle Production
A mechanism is proposed in which black hole instability at the tower scale converts a fraction of the mass into particles at the species scale, with Hawking evaporation subdominant.
-
Moduli-Space Laplacians, Asymptotic Geometry, and the Emergent String Conjecture
Under the Emergent String Conjecture, the logarithm of any principal tower mass has a moduli-space Laplacian eigenvalue quantized to N/(D-d) for KK towers and N/2 for string oscillators, equal to the instanton-weighte...
-
Gravitational waves from self-resonance during reheating with a quantum-corrected inflaton potential
A Coleman-Weinberg correction that cancels the inflaton's quadratic term at the potential minimum triggers quartic self-resonance and a peaked GW background at 10^8-10^10 Hz; a negative quadratic term instead gives a ...
-
Non-invertible symmetries in the axiverse, and the imaginary wormholes
Imaginary wormholes and the IDB imply that towers of BPS EFT instantons generate infinitely many superpotential terms that break non-invertible axion shift symmetries in N=1 axiverse models.
-
On BPS Branes
The paper defines cones C_BPS-B and C_BPS-BB for BPS branes in supergravity and conjectures that states in C_BPS-BB are realized as BPS states with C_BPS-B as their electric-magnetic dual when moduli-independent.
-
Stochastic Survival near Swampland Boundaries
Surviving inflationary histories develop a universal inward drift near any hard swampland boundary — two times the diffusion over the distance to the edge — regardless of the cutoff's microscopic origin.
-
EFTs with Symmetric Moduli Spaces: the Landscape and the Swampland
Using weight polytopes of irreducible representations, a finite list of symmetric moduli spaces satisfies the SDC decay rates; most embed from an E8(8) EFT but three cannot be obtained from string or M-theory compacti...
-
Bordisms between 9d type IIB supergravities and commutator widths of duality groups
Proposes a refinement of the Swampland Cobordism Conjecture for Ω1(BG) with duality bundle G, where diverging commutator width of G requires infinitely many duality defects to realize monodromies via gravitational solitons.
-
Controlled Penumbral Inflation from Monodromic Valleys
Local branch data determine controlled inflation in monodromic penumbral valleys when Δ > 0 and p < 2 (or p=2 with large A_pm), with a minimal exactly solvable family provided.
-
Quantum obstructions for $N=1$ infinite distance limits -- Part I: $g_s$ obstructions
Non-perturbative g_s corrections obstruct perturbative Type IIB descriptions and can remove classical infinite distance degenerations in asymptotic regions of the complex structure moduli space.
-
Background instability of quintessence model in light of entropy and distance conjecture
An entropy comparison shows quintessence backgrounds with a finite event horizon are unstable, equating the trans-Planckian censorship bound with a species-entropy growth condition.
-
5D Rotating Black Holes as dark matter in Dark Dimension Scenario: Hawking Radiation versus the Memory Burden Effect
Five-dimensional rotating primordial black holes with initial masses above 10^10 grams survive to today and can account for all dark matter due to suppressed Hawking radiation and memory burden effects in the micron-s...
-
Inflationary Particle Production and the Swampland
Tower-induced corrections to inflationary observables scale as (H/Λsp)^{2+p} and are negligible whenever H≪Λsp.
-
The dark dimension, proton decay, and the length of the M-theory interval
Proton decay limits force the M-theory interval in heterotic E8×E8 compactifications to be R ≲ 2.7×10^-28 m, ruling it out as a micron-sized dark dimension.
-
Towards theory constraints on ultralight dark matter from quantum gravity
In asymptotically safe gravity, dimension-five couplings of ultralight scalar dark matter to gauge field strengths vanish and are not generated perturbatively.
-
Dynamical-System analysis of single-axion monodromy inflation with periodically-modulated potentials
For single-axion potentials of the form Λ0^3 b + Λ1^4 cos(b/fb), the paper classifies the fixed points of the Friedmann-Klein-Gordon dynamics into stable nodes/spirals, saddles, and a bifurcation at |γ/δ|=1.
-
Solving the strong CP problem in string-inspired theories with modular invariance
Modular invariance can suppress the QCD theta angle to zero in string-inspired supersymmetric models with positive modular weights and non-trivial gauge kinetic functions, while the CKM phase stays large.
-
Nonrenormalization Theorem for ${\cal N}=(4,4)$ Interface Entropy
Interface entropy for half-BPS interfaces in N=(4,4) 2D CFTs is given by the Kähler diastasis and is invariant under conformal manifold isometries, yielding a non-renormalization theorem.
-
Classical Black Hole Probes of UV Scales
Minimal classical BPS black holes in string compactifications track the species or KK scale in infinite-distance limits, and violations may signal inconsistent EFTs.
-
Relative Quantum Gravity: Localized Gravity and the Swampland
Localized gravity theories can violate swampland constraints, but satisfy them when defined relative to a higher-dimensional gravity completion, dubbed relative quantum gravity.
-
Finiteness and the Emergence of Dualities
Finiteness of quantum gravity amplitudes implies moduli spaces have at most Euclidean volume growth, which in turn implies duality groups act semisimply on charge lattices.
-
Towards a String Realization of the Dark Dimension via T-folds
A Scherk-Schwarz T-fold compactification is engineered so that, along a selected runaway trajectory, the scalar potential scales as V proportional to m_KK^4, as required by the Dark Dimension Scenario.
-
Holographic (Eternal) Inflation
Complex mass deformations of ABJM theory yield a holographic wave function for an inflationary universe, dominated by the Hartle-Hawking no-boundary state with a subleading tunneling term.
-
De Sitter space constraints on brane tensions and couplings
The Festina Lente bound on particle masses is generalized to p-branes with world-volume Chern-Simons couplings, giving tension bounds in de Sitter space that string theory D-branes satisfy.
-
Assessing observational constraints on dark energy
Quintessence models satisfying NEC everywhere predict the w0 > -1 and w0+wa < -1 sector favored by data, due to an approximate degeneracy in the w(z) = w0 + wa z/(1+z) parameterization.
-
Thermodynamics of 4D Dilatonic Black Holes and the Weak Gravity Conjecture
Higher-derivative corrections make extremal dilatonic black holes superextremal (charge-to-mass ratio greater than one) in all solvable cases, matching the weak gravity conjecture.
Discussion (0). Continue with ORCID to comment.