Journal of High Energy Physics

http://www.springer.com/physics/particle+and+nuclear+physics/journal/13130

List of Papers (Total 23,956)

Quantum corrections to central charges and supersymmetric Casimir energy in AdS3/CFT2

Abstract We study the Casimir energy of bulk fields in AdS3 and its relation to subleading terms in the central charge of the dual CFT2. Computing both sides of the standard CFT2 relation E = −c/12 independently we show that this relation is not necessarily satisfied at the level of individual bulk supergravity states, but in theories with sufficient supersymmetry it is restored...

Sterile neutrino dark matter via GeV-scale leptogenesis?

Abstract It has been proposed that in a part of the parameter space of the Standard Model completed by three generations of keV…GeV right-handed neutrinos, neutrino masses, dark matter, and baryon asymmetry can be accounted for simultaneously. Here we numerically solve the evolution equations describing the cosmology of this scenario in a 1+2 flavour situation at temperatures T...

Lepto-philic 2-HDM + singlet scalar portal induced fermionic dark matter

Abstract We explore the possibility that the discrepancy in the observed anomalous magnetic moment of the muon Δaμ and the predicted relic abundance of Dark Matter by Planck data, can be explained in a lepto-philic 2-HDM augmented by a real SM singlet scalar of mass ∼ 10–80 GeV. We constrain the model from the observed Higgs Decay width at LHC, LEP searches for low mass exotic...

Constraining CP-violating electron-gluonic operators

Abstract We present an analysis of constraints on two types of CP-odd electron-gluonic operators (ēiγ5e)G μν a Gaμν and \( \left(\overline{e}e\right){G}_{\mu \nu}^a{\overset{\sim }{G}}^{a\mu \nu } \) from current and future electric dipole moment (EDM) experiments. The recent result from the ACME experiment using ThO molecules is used to derive an impressive lower bound on the...

Hamilton-Jacobi approach to holographic renormalization of massive gravity

Abstract Recently, a practical approach to holographic renormalization has been developed based on the Hamilton-Jacobi formulation. Using a simple Einstein-scalar theory, we clarify that this approach does not conflict with the Hamiltonian constraint as it seems. Then we apply it to the holographic renormalization of massive gravity. We assume that the shift vector is falling off...

Black holes and general Freudenthal transformations

Abstract We study General Freudenthal Transformations (GFT) on black hole solutions in Einstein-Maxwell-Scalar (super)gravity theories with global symmetry of type E7. GFT can be considered as a 2-parameter, a, b ∈ ℝ, generalisation of Freudenthal duality: \( x\to {x}_F= ax+b\tilde{x} \), where x is the vector of the electromagnetic charges, an element of a Freudenthal triple...

Black hole microstate cosmology

Abstract In this note, we explore the possibility that certain high-energy holographic CFT states correspond to black hole microstates with a geometrical behind-the-horizon region, modelled by a portion of a second asymptotic region terminating at an end-of-the-world (ETW) brane. We study the time-dependent physics of this behind-the-horizon region, whose ETW boundary geometry...

Exploring the ultra-light to sub-MeV dark matter window with atomic clocks and co-magnetometers

Abstract Particle dark matter could have a mass anywhere from that of ultralight candidates, mχ ∼ 10−21 eV, to scales well above the GeV. Conventional laboratory searches are sensitive to a range of masses close to the weak scale, while new techniques are required to explore candidates outside this realm. In particular lighter candidates are difficult to detect due to their small...

Gravitational production of superheavy dark matter and associated cosmological signatures

Abstract We study the gravitational production of super-Hubble-mass dark matter in the very early universe. We first review the simplest scenario where dark matter is produced mainly during slow roll inflation. Then we move on to consider the cases where dark matter is produced during the transition period between inflation and the subsequent cosmological evolution. The limits of...

A codex on linearized Nordström supergravity in eleven and ten dimensional superspaces

Abstract As the full off-shell theories of supergravity in the important dimensions of eleven and ten dimensions are currently unknown, we introduce a superfield formalism as a foundation and experimental laboratory to explore the possibility that the scalar versions of the higher dimensional supergravitation theory can be constructed.

Elliptic non-Abelian Donaldson-Thomas invariants of ℂ3

Abstract We compute the elliptic genus of the D1/D7 brane system in flat space, finding a non-trivial dependence on the number of D7 branes, and provide an F-theory interpretation of the result. We show that the JK-residues contributing to the elliptic genus are in one-to-one correspondence with coloured plane partitions and that the elliptic genus can be written as a chiral...

Quantum quenches and thermalization in SYK models

Abstract We study non-equilibrium dynamics in SYK models using quantum quench. We consider models with two, four, and higher fermion interactions (q = 2, 4, and higher) and use two different types of quench protocol, which we call step and bump quenches. We analyse evolution of fermion two-point functions without long time averaging. We observe that in q = 2 theory the two-point...

Threshold resummation for dark-matter production at the LHC

We derive precision predictions for the production of dark-matter particles recoiling against a jet with large transverse momentum at the LHC. The dark-matter fermions are described within a simplified model and couple to the Standard Model via a vector mediator. Our predictions for the mono-jet signature include the resummation of the leading and next-to-leading threshold...

Dark matter production during the thermalization era

Abstract We revisit the non-thermal dark matter (DM) production during the thermalization and reheating era after inflation. The decay of inflaton produces high-energy particles that are thermalized to complete the reheating of the Universe. Before the thermalization is completed, DM can be produced from a collision between the high-energy particles and/or the ambient plasma. We...

New Fayet-Iliopoulos terms in \( \mathcal{N}=2 \) supergravity

Abstract We present a new type of Fayet-Iliopoulos (FI) terms in \( \mathcal{N}=2 \) supergravity that do not require the gauging of the R-symmetry. We elaborate on the impact of such terms on the vacuum structure of the \( \mathcal{N}=2 \) theory and compare their properties with the standard Fayet-Iliopoulos terms that arise from gaugings. In particular, we show that, with the...

Gluon bremsstrahlung in finite media beyond multiple soft scattering approximation

Abstract We revisit the calculation of the medium-induced gluon spectrum in a finite QCD medium and develop a new approach that goes beyond multiple soft scattering approximation. We show by expanding around the harmonic oscillator that the first two orders encompass the two known analytic limits: single hard and multiple soft scattering regimes, valid at high and low frequencies...

Extremal and near-extremal black holes and near-CFT1

Abstract We study the behaviour of extremal and near-extremal black holes at low energies and low temperatures and find that it can be understood from the near-horizon AdS2 region. Our analysis includes charged matter and also goes beyond the S-wave approximation. We find that the leading behaviour at low energies arises from a mode linked to time reparametrisations and from...

Effective gauge theories of superfluidity with topological order

Abstract We discuss the low-energy dynamics of superfluidity with topological order in (3 + 1) spacetime dimensions. We generalize a topological BF theory by introducing a non-square K matrix, and this generalized BF theory can describe massless Nambu-Goldstone bosons and anyonic statistics between vortices and quasiparticles. We discuss the general structure of discrete and...

Production of purely gravitational dark matter: the case of fermion and vector boson

Abstract We consider the simplest possibility for a model of particle dark matter in which dark matter has only gravitational interaction with the standard model sector. Even in such a case, it is known that the gravitational particle production in an expanding universe may lead to a correct relic abundance depending on the ination scale and the mass of dark matter particle. We...

Removing infrared divergences from two-loop integrals

Abstract Feynman amplitudes at higher orders in perturbation theory generically have complex singular structures. Notwithstanding the emergence of many powerful new methods, the presence of infrared divergences poses significant challenges for their evaluation. In this article, we develop a systematic method for the removal of the infrared singularities, by adding appropriate...

Top-Yukawa contributions to bbH production at the LHC

Abstract We study the production of a Higgs boson in association with bottom quarks \( \left(b\overline{b}H\right) \) in hadronic collisions at the LHC, including the different contributions stemming from terms proportional to the top-quark Yukawa coupling (y t 2 ), to the bottom-quark one (y b 2 ), and to their interference (ybyt). Our results are accurate to next-to-leading...

Fiducial cross sections for the four-lepton decay mode in Higgs-plus-jet production up to NNLO QCD

Abstract The four-lepton decay mode of the Higgs boson allows for a clean kinematic reconstruction, thereby enabling precision studies of the Higgs boson properties and of its production dynamics. We compute the NNLO QCD corrections to fiducial cross sections relevant to this decay mode in the gluon-fusion channel producing a Higgs boson in association with a hadronic jet, and...

Light fermionic WIMP dark matter with light scalar mediator

Abstract A light fermionic weakly interacting massive particle (WIMP) dark matter is investigated by studying its minimal renormalizable model, where it requires a scalar mediator to have an interaction between the WIMP and standard model particles. We perform a comprehensive likelihood analysis of the model involving the latest but robust constraints and those will be obtained...

Exploring inert scalars at CLIC

Abstract We investigate the prospect of discovering the Inert Doublet Model scalars at CLIC. As signal processes, we consider the pair-production of inert scalars, namely e+e− → H+H− and e+e− → AH, followed by decays of charged scalars H± and neutral scalars A into leptonic final states and missing transverse energy. We focus on signal signatures with two muons or an electron and...