Article
Astronomy & Astrophysics
Ki-Seok Kim, Mitsuhiro Nishida, Yoonseok Choun
Summary: By implementing a nonperturbative Wilsonian renormalization group (RG) transformation, we establish an effective holographic dual description with an emergent extradimension associated with an RG scale. In the large-N limit, we derive an equation of motion for an order-parameter field, such as the chiral condensate. We demonstrate an intertwined structure between the first-order RG flow equations and the second-order differential equation of the order-parameter field, leading to a nonperturbative RG-improved mean-field theory. Assuming translational symmetry as the vacuum state, we solve the nonlinear coupled mean-field equations by matching the UV and IR solutions, revealing an RG flow from a weakly coupled chiral-symmetric UV fixed point to a strongly correlated chiral-symmetry broken IR fixed point.
Article
Physics, Particles & Fields
Polina Petriakova, Arkady A. Popov, Sergey G. Rubin
Summary: This paper discusses the origin of small parameters and aims to explain the Hierarchy problem. Flexible extra dimensions play a crucial role in the formation of physical parameters. The evolution of multidimensional metric starts from the Planck scale and ends with a static extra-dimensional metric and a 4-dimensional de Sitter space at high energies, leading to exponentially produced causally disconnected universes. Quantum fluctuations independently distort the metric within these universes, causing inflationary processes. Some universes asymptotically tend towards states characterized by small Hubble parameters. The explanation for the effective parameter reduction in the Higgs sector of the Standard Model lies in the presence of small-amplitude distributions of a scalar field in a fraction of these universes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Soumya Jana, Charles Dalang, Lucas Lombriser
Summary: The article investigates a method of transforming higher-dimensional actions into effective four-dimensional scalar-tensor theories, and finds a subset of Horndeski theories through the higher-dimensional Ricci scalar and a subclass of metric ansatz.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Physics, Particles & Fields
Emir Syahreza Fadhilla, Bobby Eka Gunara, Ardian Nata Atmaja
Summary: In this study, we investigate the BPS submodels of the higher dimensional Skyrme model and their properties. Two possible BPS submodels, the BPS Skyrme model and the scale-invariant model, are found. The first submodel supports BPS Skyrmions with B >= 1, while the second submodel only has B = 1 BPS Skyrmion. The scale-invariant model exhibits a stronger self-duality condition compared to the BPS Skyrme model.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Kays Haddad
Summary: In this study, we investigate the compatibility of recursive techniques and the classical limit of scattering amplitudes by constructing the classical Compton amplitude for spinning compact objects. By using BCFW recursion on three-point amplitudes expressed in terms of classical spin vector and tensor, and expanding it to next-to-leading-order using heavy on-shell spinors, we match the result with classical computations and find that lower-point quantum contributions are generally required for building classical spinning higher-point amplitudes with massive propagators. Therefore, we conclude that BCFW recursion and the classical limit do not commute. We also remove non-localities in all orders of spin for opposite graviton helicities and up to fifth order for the same-helicity case. Finally, we list and explicitly write all possible on-shell contact terms that are potentially relevant to black-hole scattering at the second post-Minkowskian order.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Multidisciplinary
Bikash Chandra Paul
Summary: We generalize Dymnikova black hole solutions in higher dimensions for both Einstein's general theory of relativity (GR) and Rastall theory. The non-singular black hole solution in GR is presented in the framework of higher dimensional GR and Rastall theory, with a finite radial pressure and a set of model parameter determined transverse pressure at the center. The solutions reduce to the singularity-free Schwarzschild black hole as the spacetime dimension increases.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Particles & Fields
Biswajit Sahoo, Ashoke Sen
Summary: The classical soft graviton theorem derives the gravitational wave-form for general classical scattering at future null infinity in the late retarded time. The large u expansion reveals three universal terms with coefficients determined solely by the momenta of incoming and outgoing hard particles. The dependence on the momenta of final state radiation/massless particles cancels for the coefficients of 1/u and ln u/u(2) terms, indicating that the result is solely determined by the momenta of incoming particles/radiation and final state massive particles. The result has implications for calculating the low frequency flux of gravitational radiation in the collision of massless particles with large impact parameter.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
David Kokoska, Marcello Ortaggio
Summary: We investigated the complete family of Robinson-Trautman spacetimes sourced by conformally invariant nonlinear electrodynamics in D dimensions in the presence of an arbitrary cosmological constant. The solutions exist only in even dimensions, with static metrics containing dyonic black holes and different asymptotics. Time-dependent solutions may represent white hole evaporation or black hole formation in a time-reversed picture, and a quasilocal characterization of possible past horizons is discussed.
Article
Physics, Particles & Fields
Andrea Campoleoni, Simon Pekar
Summary: The study introduces higher-spin algebras containing a Poincare subalgebra and explores their potential as candidate rigid symmetries for higher-spin gauge theories or Carrollian conformal higher-spin symmetries. It also discusses the definition of higher-spin algebras containing a Galilean conformal subalgebra, to be interpreted as non-relativistic limits of the conformal symmetries.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Pietro Baratella, Clara Fernandez, Benedict von Harling, Alex Pomarol
Summary: On-shell amplitude methods are efficient for calculating anomalous dimensions, with the use of angular momentum decomposition simplifying one-loop anomalous dimensions into a sum of products of partial waves. Applying this to SM EFT reveals certain classes of anomalous dimensions originating from the same partial-wave coefficients. Additionally, a generic formula for one-loop anomalous dimensions of nonlinear sigma models at any order in the energy expansion is obtained, and the method is applied to gravity, proving advantageous even in the presence of IR divergencies.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Stefano Antonini, Brian Swingle
Summary: Recently proposed microscopic models of braneworld cosmology in the context of AdS/CFT correspondence suggest the realization of black hole microstates containing an end-of-the-world brane. By studying similar microstates in a simplified version of AdS=CFT, significant evidence has been found for the microscopic existence of these microstates.
Article
Physics, Particles & Fields
Tung Tran
Summary: The inverse Penrose transform for self-dual Yang-Mills and its higher-spin extensions is presented on a flat background. The twistor action for the higher-spin extension of SDYM is of BT-type, and a new action describing a higher-spin extension of Yang-Mills theory is discovered through a deformation away from the self-dual sector of HS-SDYM. The twistor action for HS-YM is a straightforward generalization of the Yang-Mills one.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Joren Brunekreef, Daniel Nemeth
Summary: A detailed investigation of the phase structure and semiclassical effective action of (2+1)-dimensional Causal Dynamical Triangulations (CDT) quantum gravity is performed using computer simulations. The research shows that generalizations of the simplicial manifold conditions and spatial topology do not affect the phase structure, and the resulting effective action is consistent with continuum Einstein gravity.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Jeongwon Ho, O-Kab Kwon, Sang-A Park, Sang-Heon Yi
Summary: In this paper, we find a metric solution for a (1 + 1)-dimensional background that hosts various supersymmetric field theories with a single non-chiral real supercharge. Despite containing a naked null singularity, this supersymmetric background is globally hyperbolic. We show that scalar wave propagation on the background is well-defined, suggesting that the curvature singularity is mild. Building on our previous work, we establish a connection between the field theory on this curved background and certain classes of (1 + 1)-dimensional inhomogeneous field theory in the supersymmetric setup. By utilizing this supersymmetric background, we demonstrate the limitations of canonical quantization and emphasize the conceptual advantages of the algebraic approach to quantization.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Wagno Cesar e Silva, Ilya L. Shapiro
Summary: This article explores the decoupling issue of the massive ghost mode in the 4D theory of the conformal factor of the metric. It analyzes the asymptotic behavior of the derived one-loop nonlocal form factors in the UV and IR limits. The results reproduce the Minimal Subtraction scheme-based beta functions in the UV domain and show that the structures contributing to the running of parameters in the IR are correlated with the divergent part from the effective low-energy theory of the conformal factor.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Claudia de Rham, Scott Melville, Johannes Noller
Summary: Positivity bounds have been used to constrain scalar-tensor theories of dark energy, but coupling to matter fields has played a limited role. Demanding positivity when including interactions with standard matter fields leads to further constraints on the dark energy parameter space. Implementing these bounds as theoretical priors affects cosmological parameter constraints and shows that gravitational waves must travel superluminally on cosmological backgrounds in a standard UV completion.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Multidisciplinary
Yiqi Xie, Jun Zhang, Hector O. Silva, Claudia de Rham, Helvi Witek, Nicolas Yunes
Summary: In general theories of gravity, the spacetime of a stationary, axisymmetric, and asymptotically flat solution must be circular if the solution can be perturbatively obtained from a solution in the general relativity limit. This result applies to a wide range of gravitational theories including arbitrary scalars and vectors, with nonstandard kinetic terms and nonminimal couplings to gravity treated perturbatively.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Lasma Alberte, Claudia de Rham, Sumer Jaitly, Andrew J. Tolley
Summary: The low-energy theory can be used to constrain the UV behavior of gravitational scattering amplitudes by considering graviton-photon scattering in the standard model.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Claudia de Rham, Sebastian Garcia-Saenz, Lavinia Heisenberg, Victor Pozsgay
Summary: Proca-Nuevo is a non-linear theory of a massive spin-1 field that can be extended by adding operators from the Generalized Proca class. This extension maintains the primary constraint necessary for consistency and allows for interpolation between Generalized Proca operators and Proca-Nuevo ones. When mixed with gravity, the constraint is broken in a Planck scale suppressed way. The theory can be covariantized in models that allow for consistent and ghost-free cosmological solutions, and it accurately describes the dynamics and dispersion relations of perfect fluid matter. Specific solutions exhibit hot Big Bang scenarios with a late-time self-accelerating epoch, where gravitational waves behave similarly to General Relativity.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Multidisciplinary
Claudia de Rham, Andrew J. Tolley, Jun Zhang
Summary: In this article, we investigate the effective field theory of gravity around black holes and find that the coefficients of the dimension-8 operators are tightly constrained by causality considerations. These constraints are more stringent than previously derived causality and positivity bounds, suggesting that the effects of a single dimension-8 operator cannot be observed while maintaining causality. We also identify the regime where the generic dimension-8 and lower order operators can potentially be observable while preserving causality.
PHYSICAL REVIEW LETTERS
(2022)
Review
Physics, Particles & Fields
K. G. Arun, Enis Belgacem, Robert Benkel, Laura Bernard, Emanuele Berti, Gianfranco Bertone, Marc Besancon, Diego Blas, Christian G. Bohmer, Richard Brito, Gianluca Calcagni, Alejandro Cardenas-Avendano, Katy Clough, Marco Crisostomi, Valerio De Luca, Daniela Doneva, Stephanie Escoffier, Jose Maria Ezquiaga, Pedro G. Ferreira, Pierre Fleury, Stefano Foffa, Gabriele Franciolini, Noemi Frusciante, Juan Garcia-Bellido, Carlos Herdeiro, Thomas Hertog, Tanja Hinderer, Philippe Jetzer, Lucas Lombriser, Elisa Maggio, Michele Maggiore, Michele Mancarella, Andrea Maselli, Sourabh Nampalliwar, David Nichols, Maria Okounkova, Paolo Pani, Vasileios Paschalidis, Alvise Raccanelli, Lisa Randall, Sebastien Renaux-Petel, Antonio Riotto, Milton Ruiz, Alexander Saffer, Mairi Sakellariadou, Ippocratis D. Saltas, B. S. Sathyaprakash, Lijing Shao, Carlos F. Sopuerta, Thomas P. Sotiriou, Nikolaos Stergioulas, Nicola Tamanini, Filippo Vernizzi, Helvi Witek, Kinwah Wu, Kent Yagi, Stoytcho Yazadjiev, Nicolas Yunes, Miguel Zilhao, Niayesh Afshordi, Marie-Christine Angonin, Vishal Baibhav, Enrico Barausse, Tiago Barreiro, Nicola Bartolo, Nicola Bellomo, Ido Ben-Dayan, Eric A. Bergshoeff, Sebastiano Bernuzzi, Daniele Bertacca, Swetha Bhagwat, Beatrice Bonga, Lior M. Burko, Geoffrey Compere, Giulia Cusin, Antonio da Silva, Saurya Das, Claudia de Rham, Kyriakos Destounis, Ema Dimastrogiovanni, Francisco Duque, Richard Easther, Hontas Farmer, Matteo Fasiello, Stanislav Fisenko, Kwinten Fransen, Jorg Frauendiener, Jonathan Gair, Laszlo Arpad Gergely, Davide Gerosa, Leonardo Gualtieri, Wen-Biao Han, Aurelien Hees, Thomas Helfer, Jorg Hennig, Alexander C. Jenkins, Eric Kajfasz, Nemanja Kaloper, Vladimir Karas, Bradley J. Kavanagh, Sergei A. Klioner, Savvas M. Koushiappas, Macarena Lagos, Christophe Le Poncin-Lafitte, Francisco S. N. Lobo, Charalampos Markakis, Prado Martin-Moruno, C. J. A. P. Martins, Sabino Matarrese, Daniel R. Mayerson, Jose P. Mimoso, Johannes Noller, Nelson J. Nunes, Roberto Oliveri, Giorgio Orlando, George Pappas, Igor Pikovski, Luigi Pilo, Geraint Pratten, Tomislav Prokopec, Hong Qi, Saeed Rastgoo, Angelo Ricciardone, Rocco Rollo, Diego Rubiera-Garcia, Olga Sergijenko, Stuart Shapiro, Deirdre Shoemaker, Alessandro Spallicci, Oleksandr Stashko, Leo C. Stein, Gianmassimo Tasinato, Andrew J. Tolley, Elias C. Vagenas, Stefan Vandoren, Daniele Vernieri, Rodrigo Vicente, Toby Wiseman, Valery Zhdanov, Miguel Zumalacarregui
Summary: This white paper summarizes the importance of LISA in the field of fundamental physics and discusses future research directions and connections with other working groups.
LIVING REVIEWS IN RELATIVITY
(2022)
Article
Physics, Particles & Fields
Claudia de Rham, Laura Engelbrecht, Lavinia Heisenberg, Alice Luescher
Summary: Assuming unitarity, locality, causality, and Lorentz invariance, this paper derives new constraints on the effective field theory coefficients for the Generalized Proca and Proca Nuevo massive vector models, while finding interesting analogues between the two models.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Tessa Baker, Enrico Barausse, Anson Chen, Claudia de Rham, Mauro Pieroni, Gianmassim Tasinto
Summary: Effective field theories (EFT) of dark energy (DE) are limited by constraints on the propagation speed of gravitational waves (GW) but can still be valid at scales beyond the EFT description. Lower frequency observations by LISA would be harder to escape, while a joint observation by LISA and a terrestrial interferometer could constrain the speed of light and gravitons to within 10^-15. Multiband GW observations can therefore effectively constrain DE scenarios based on EFT.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Physics, Particles & Fields
Claudia de Rham, Sebastian Garcia-Saenz, Lavinia Heisenberg, Victor Pozsgay, Xinmiao Wang
Summary: It was recently suggested that half degrees of freedom could exist in Lorentz and parity invariant field theories. A specific example, the non-linear Proca field theory called Proca-Nuevo, is used to illustrate this argument. Through the Lagrangian and Hamiltonian approaches, we present two proofs that this theory possesses a pair of second class constraints, resulting in D - 1 degrees of freedom in D spacetime dimensions, which is consistent with a Proca model. Our proofs are explicit and straightforward in two dimensions and we discuss their generalization to any number of dimensions. We also clarify why local Lorentz and parity invariant field theories cannot have half degrees of freedom.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Mariana Carrillo Gonzalez, Claudia de Rham, Victor Pozsgay, Andrew J. Tolley
Summary: This paper investigates the constraints imposed by low energy causality alone on EFTs and finds that these constraints are in agreement with the compact positivity constraints obtained from scattering amplitude dispersion relations.
Article
Astronomy & Astrophysics
Claudia de Rham, Lavinia Heisenberg, Ankip Kumar, Jann Zosso
Summary: The article discusses the construction and nature of general derivative self-interactions for a massive Proca field. It is found that despite differences in scattering amplitudes, the high energy behavior of Proca-Nuevo and generalized Proca is the same when quantum corrections are taken into account.
Article
Astronomy & Astrophysics
Lasma Alberte, Claudia de Rham, Sumer Jaitly, Andrew J. Tolley
Summary: Positivity bounds applied to U(1) gauge theory reveal violations that can be rectified by introducing new physics at a low scale Lambda(new), contrasting previous studies that focused on different applications. The introduction of a small amount of negativity is conjectured to be allowed and not conflict with standard UV completions.