HEP Phenomenology·hep-ph

Tue·Jan 4, 2022Tuesday·January 4, 2022

27 papers—22 primary·5 cross-listed·reconstructed*

01*
Capture of Dark Matter in Neutron Stars
Giorgio Busoni🇩🇪
The extreme conditions in Neutron Stars make them ideal test facilities for fundamental interactions. A Neutron Star can capture Dark Matter via scattering. As a result of the scattering, Dark Matter kinetic energy is transferred to the star. An observational consequence of this can be the warming of old neutron stars to near-infrared temperatures. Different approximations or simplifications have been applied to previous analyses of the capture process. In this article, we summarise a significantly improved treatment of Dark Matter capture, which properly accounts for all relevant physical effects over a wide range of Dark Matter masses. Among them are gravitational focusing, a fully relativistic scattering treatment, Pauli blocking, neutron star opacity and multiple scattering effects. This paper cites general expressions that allow the capture rate to be computed numerically, and simplified expressions for particular types of interactions or mass regimes, which greatly increase the efficiency of computation. As a result of our method, we are able to model the scattering of Dark Matter from any neutron star constituent as well as the capture of Dark Matter in other compact objects. Our results are applied to scattering of Dark Matter from neutrons, protons, leptons and exotic baryons.
hep-phMoscow Univ.Phys.Bull.(2022)·22 citations
02*
Higgs Properties and Supersymmetry: Constraints and Sensitivity from the LHC to an $e^{+} e^{-}$ Collider
A. Arbey🇫🇷 · M. Battaglia🇨🇭 · A. Djouadi🇪🇸 · F. Mahmoudi🇫🇷 · M. Muhlleitner🇩🇪 · M. Spira🇨🇭
The study of the Higgs boson properties offers compelling perspectives for testing the effects of physics beyond the Standard Model and has deep implications for the LHC program and future colliders. Accurate determinations of the Higgs boson properties can provide us with a distinctively precise picture of the Higgs sector, set tight bounds, and predict ranges for the values of new physics model parameters. In this paper, we discuss the constraints on supersymmetry that can be derived by a determination of the Higgs boson mass and couplings. We quantify these constraints by using scans of the 19-parameter space of the so-called phenomenological minimal supersymmetric Standard Model. The fraction of scan points that can be excluded by the Higgs measurements is studied for the coupling measurement accuracies obtained in LHC Run 2 and expected for the HL-LHC program and $e^{+} e^{-}$ colliders and contrasted with those derived from missing transverse energy searches at the LHC and from dark matter experiments.
hep-phPRD(2022)·12 citations
03*
Low energy supersymmetry confronted with current experiments: an overview
Fei Wang🇨🇳 · Wenyu Wang🇨🇳 · Jin Min Yang🇨🇳 · Yang Zhang🇨🇳 · Bin Zhu🇨🇳
This study provides a brief overview of low-energy supersymmetry (SUSY) in light of current experimental constraints, such as collider searches, dark matter searches, and muon $g - 2$ measurements. In addition, we survey a variety of low energy supersymmetric models: the phenomenological minimal supersymmetric model (MSSM); the supersymmetric models with cut-off-scale boundary conditions, i.e., the minimal supergravity (mSUGRA) or the constrained MSSM (CMSSM), the gauge mediation of SUSY breaking (GMSB), and the anomaly mediation of SUSY breaking (AMSB), as well as their extensions. The conclusion is that the low energy SUSY can survive all current experimental constraints and remains compelling, albeit suffering from a little fine-tuning problem. The fancy models like mSUGRA, GMSB, and AMSB need to be extended if the muon $g - 2$ anomaly comes from new physics.
hep-phUniverse(2022)·27 citations
04*
Possible early universe signals in proton collisions at the Large Hadron Collider
Raghunath Sahoo🇮🇳 · Tapan Kumar Nayak🇨🇭
Our universe was born about 13.8 billion years ago from an extremely hot and dense singular point, in a process known as the Big Bang. The hot and dense matter which dominated the system within a few microseconds of its birth was in the form of a soup of elementary quarks and gluons, known as the quark-gluon plasma (QGP). Signatures compatible with the formation of the QGP matter have experimentally been observed in heavy-ion (such as Au or Pb) collisions at ultra-relativistic energies. Recently, experimental data of proton-proton (pp) collisions at the CERN Large Hadron Collider (LHC) have also shown signals resembling those of the QGP formation, which made these studies quite stimulating as to how the collision of small systems features in producing the early universe signals. In this article, we report on some of the compelling experimental results and give an account of the present understanding. We review the pp physics program at the LHC and discuss future prospects in the context of exploring the nature of the primordial matter in the early universe.
hep-phhep-exhep-thnucl-ex+1Curr.Sci.(2021)·22 citations
05*
The Pomeron -- A Bootstrap Story
Chung-I Tan🇺🇸
In a contribution to the volume {\it A Passion for Physics}, a collection of essays in honor of Geoffrey Chew's sixtieth birthday, I wrote, together with A. Capella, Uday Sukhatme, and Tran Thanh Van {\it The Pomeron Story.} This is a follow-up to that contribution. This sequel also serves as an opportunity to acknowledge my gratitude to Geoff as a PhD student under his tutelage.
hep-phhep-thphysics.hist-ph1 citation
06*
Energy evolution of the overlap functions: increasing ratio of $σ_{e l} (s) / σ_{t o t} (s)$ and black ring emergence
S.M. Troshin🇷🇺 · N.E. Tyurin🇷🇺
We analyse the two possible options of the energy dependency of the elastic and inelastic overlap functions. These correspond to saturation of the black disk limit (BEL effect) and to the unitarity saturation (REL effect) at $s \to \infty$ . Relation of the REL effect to increase of the ratio $σ_{e l} (s) / σ_{t o t} (s)$ and emergence of black ring picture at the LHC is underlined.
hep-phJ.Phys.G·4 citations
07*
Off-shell $t t ˉ b b ˉ$ production at the LHC: QCD corrections, theory uncertainties and $b$ -jet definitions
Giuseppe Bevilacqua🇭🇺
We present state-of-the-art predictions for off-shell $t t ˉ b b ˉ$ production with di-lepton decays at the LHC with $s = 13$ TeV. Results are accurate at NLO in QCD and include all resonant and non-resonant diagrams, interferences and finite-width effects for top quarks and $W$ bosons. We discuss the impact of QCD corrections and assess theoretical uncertainties from scale and PDF dependence at the integrated and differential level. Additionally we investigate the size of contributions induced by initial-state $b$ quarks to the NLO cross section.
hep-phActa Phys.Polon.Supp.(2022)·0 citations
08*
Chiral Dynamics: Theory and Experiment -- A Tribute to Aron Bernstein
Ulf-G. Meißner🇩🇪
I review and discuss the contributions of Aron Bernstein to the field of chiral dynamics.
hep-phhep-exhep-latnucl-ex+1PoS(2024)·2 citations
09*
Charged Lepton Flavor Violation at the High-Energy Colliders: Neutrino Mass Relevant Particles
Yongchao Zhang🇨🇳
We summarize the potential charged lepton flavor violation (LFV) from neutrino mass relevant models, for instance the seesaw mechanisms. In particular, we study, in a model-dependent way, the LFV signals at the high-energy hadron and lepton colliders originating from the beyond standard model (BSM) neutral scalar $H$ , doubly charged scalar $H^{\pm\pm}$ , heavy neutrino $N$ , heavy $W_{R}$ boson, and the $Z^{'}$ boson. For the neutral scalar, doubly charged scalar and $Z^{'}$ boson, the LFV signals originate from the (effective) LFV couplings of these particles to the charged leptons, while for the heavy neutrino $N$ and $W_{R}$ boson, the LFV effects are from flavor mixing in the neutrino sector. We consider current limits on these BSM particles and estimate their prospects at future high-energy hadron and lepton colliders.
hep-phhep-exUniverse(2022)·2 citations
10*
Hadronic three-body D decays mediated by scalar resonances
Hai-Yang Cheng🇹🇼 · Cheng-Wei Chiang🇹🇼 · Zhi-Qing Zhang🇨🇳
We study the quasi-two-body $D \to S P$ decays and the three-body $D$ decays proceeding through intermediate scalar resonances, where $S$ and $P$ denote scalar and pseudoscalar mesons, respectively. Our main results are: (i) Certain external and internal $W$ -emission diagrams with the emitted meson being a scalar meson are naïvely expected to vanish, but they actually receive contributions from vertex and hard spectator-scattering corrections beyond the factorization approximation. (ii) For light scalars with masses below or close to 1~GeV, it is more sensible to study three-body decays directly and compare with experiment as the two-body branching fractions are either unavailable or subject to large finite-width effects of the scalar meson. (iii) We consider the two-quark (scheme I) and four-quark (scheme II) descriptions of the light scalar mesons, and find the latter generally in better agreement with experiment. This is in line with recent BESIII measurements of semileptonic charm decays that prefer the tetraquark description of light scalars produced in charmed meson decays. (iv) The topological amplitude approach fails here as the $D \to S P$ decay branching fractions cannot be reliably inferred from the measurements of three-body decays, mainly because the decay rates cannot be factorized into the topological amplitude squared and the phase space factor. (v) The predicted rates for $D^{0} \to f_{0} P, a_{0} P$ are generally smaller than experimental data by one order of magnitude, presumably implying the significance of $W$ -exchange amplitudes. (vi) The $W$ -annihilation amplitude is found to be very sizable in the $S P$ sector with $∣ A / T ∣_{S P} \sim 1/2$ , contrary to its suppression in the $P P$ sector with $∣ A / T ∣_{P P} \sim 0.18$ .
hep-phhep-exhep-latPRD(2022)·34 citations
11*
Analysis on the composite nature of the light scalar mesons $f_{0} (980)$ and $a_{0} (980)$
Ze-Qiang Wang🇨🇳 · Xian-Wei Kang🇨🇳 · J. A. Oller🇪🇸 · Lu Zhang🇨🇳
We study the weight or compositeness of the $π π$ - $K K ˉ$ and $π η$ - $K K ˉ$ in the composition of the $f_{0} (980)$ and $a_{0} (980)$ resonances, respectively. Either we use the saturation of the total width and compositeness, or we use a Flatté parameterization taking also into account the spectral function of a near-threshold resonance. We make connections and compare between these two methods. We take input values for the pole mass and width from several determinations in the literature. In addition, we take as third input either the total compositeness or the decay-width branching ratio to the lighter channel for each resonance. It turns out that for the poles considered the meson-meson components are dominant for the $f_{0} (980)$ , while for the $a_{0} (980)$ resonance they are subdominant. We also provide partial decay widths and partial compositeness coefficients, so that the $K K ˉ$ component is the most important one for the $f_{0} (980)$ . Additionally, this study stresses the need to distinguish between the bare and dressed couplings and widths in a Flatté parameterization. We elaborate on the connection between the partial-decay widths calculated in terms of the dressed couplings and the actual measured ones. Due to the coupled-channel dynamics when the pole lies near the heavier threshold in the second Riemann sheet some changes are needed with respect to standard relations.
hep-phhep-exnucl-thPRD(2022)·29 citations
12*
The study of lepton EDMs in $U (1)_{X}$ SSM
Lu-Hao Su🇨🇳 · Dan He🇨🇳 · Xing-Xing Dong🇨🇳 · Tai-Fu Feng🇨🇳 · Shu-Min Zhao🇨🇳
The minimal supersymmetric extension of the standard model (MSSM) is extended to the $U (1)_{X}$ SSM, whose local gauge group is $S U (3)_{C} \times S U (2)_{L} \times U (1)_{Y} \times U (1)_{X}$ . To obtain the $U (1)_{X}$ SSM, we add the new superfields to the MSSM, namely: three Higgs singlets $η^, η ˉ^, S^$ and right-handed neutrinos $ν^_{i}$ . The CP violating effects are considered to study the lepton electric dipole moment(EDM) in $U (1)_{X}$ SSM. The CP violating phases in $U (1)_{X}$ SSM are more than those in the standard model(SM). In this model, some new parameters $(θ_{S}, θ_{B B^{'}}, θ_{B L})$ as CP violating phases are considered, so there are new contributions to lepton EDMs. It is conducive to exploring the source of CP violation and probing new physical beyond SM.
hep-phCPC(2022)·2 citations
13*
Canonical interpretation of the $D_{s 0} (2590)^{+}$ resonance
Zhuo Gao🇨🇳 · Guan-Ying Wang🇨🇳 · Qi-Fang Lü🇨🇳 · Jingya Zhu🇨🇳 · Gao-Feng Zhao🇨🇳
The $D_{s 0} (2590)^{+}$ resonance observed by LHCb Collaboration is a strong candidate of the $D_{s} (2^{1} S_{0})$ state according to its spin parity and strong decay mode. However, the measured mass seems relatively lower than the previous theoretical predictions, which interests the coupled channel interpretations in the literature. In this work, we adopt an alternate approach, taking into account the screening effects in the potential model, to describe the $D_{s 0} (2590)^{+}$ resonance. The mass spectrum and strong decays of the excited charmed-strange mesons are investigated within the modified relativized quark model and $^{3} P_{0}$ model. The calculated mass and width of the $D_{s 0} (2590)^{+}$ are consistent with the experimental observations, which indicate that it can be reasonably interpreted as the $D_{s} (2^{1} S_{0})$ state.
hep-phhep-exPRD(2022)·13 citations
14*
Cosmology of Supercooled Universe
Kiyoharu Kawana🇰🇷
First-order phase transitions (FOPTs) are ubiquitous in physics beyond the Standard Model (SM). Recently, models with no dimensionful parameters in the tree-level action have been attracting much attention because they can predict a very strong FOPT with ultra-supercooling. In this paper, we study the cosmological signatures of such a supercooling model. As a concrete model, we consider the SM with two additional real scalars $ϕ$ and $S$ , which can realize the electroweak symmetry breaking via Coleman-Weinberg mechanism. One of the additional scalars $S$ can naturally become a Dark Matter (DM) candidate due to the $Z_{2}$ symmetry of the action. We study the FOPT of this model and calculate the Gravitational Wave (GW) signals and the thermal relic abundance of $S$ taking the filtered effects into account. Within the envelope approximation, we find that the GW peak amplitude can reach $\sim 1 0^{- 10}$ around the frequency $f \sim 1 0^{- 3}$ Hz for model parameters $(v_{ϕ}, λ_{ϕS}) \sim (200 TeV, 1.6)$ where $v_{ϕ}$ is the vacuum expectation value of $ϕ$ and $λ_{ϕS}$ is the scalar mixing coupling. On the other hand, the filtered DM mechanism only works for $0.8 ≲ λ_{ϕS} ≲ 1$ , where the GW peak amplitude is found to be quite small $≲ 1 0^{- 17}$ .
hep-phastro-ph.COPRD(2022)·22 citations
15*
Theoretical aspects of $D^{0} - D ˉ^{0}$ mixing
Hiroyuki Umeeda🇹🇼
Observables in the $D^{0} - D ˉ^{0}$ mixing can be theoretically analyzed by the operator product expansion (OPE), in which $1/ m_{c}$ is regarded as an expansion parameter. Since the contributions of four-quark operators are strongly suppressed by the Glashow-Iliopoulos-Maiani (GIM) mechanism, the order of magnitude of the width difference is still not reproduced in the OPE analysis. In view of this issue, quark-hadron duality, an assumption that is tacitly made in the OPE, is studied for the $D^{0} - D ˉ^{0}$ mixing. In particular, the exclusive width difference and the inclusive counterpart can be compared within the 't Hooft model, two-dimensional QCD in the large- $N_{c}$ limit. It is shown that the order of magnitude of the exclusive width difference is enhanced relative to the 4D-like inclusive contributions of the four-quark operators, that is qualitatively consistent with the realistic observation of the $D^{0} - D ˉ^{0}$ mixing.
hep-phPoS(2023)·1 citation
16*
Higgs-Sector Predictions from Maximally Symmetric multi-Higgs Doublet Models
Neda Darvishi🇺🇸 · M.R. Masouminia🇬🇧 · Apostolos Pilaftsis🇬🇧
Maximally Symmetric $n$ -Higgs Doublet Models (MS- $n$ HDMs)define very economic settings that enable sharp Higgs-sector predictions beyond the Standard Model (SM) potentially testable at high-energy colliders. The scalar potential of a MS- $n$ HDM obeys an $Sp (2 n)$ symmetry, which is softly broken by bilinear scalar masses and explicitly by hypercharge and Yukawa couplings through renormalisation-group effects. The $Sp (2 n)$ also ensures natural SM alignment and allows for quartic coupling unification up to the Planck scale. As typical examples, we consider maximally symmetric realisations of the Type-II 2HDM and the Type-V 3HDM. We show how in terms of a few input parameters, definite predictions for the entire scalar mass spectrum of the MS-2HDM and MS-3HDM are obtained, including the SM-like Higgs-boson couplings to the gauge bosons and fermions.
hep-phPoS(2022)·3 citations
17*
Weak charges in $S U (5)_{L} \times U (1)_{Y}$ gauge models
Adrian Palcu🇷🇴
Within the framework of a renormalizable $S U (5)_{L} \times U (1)_{Y}$ electro-weak gauge model with no exotic electric charges, we obtain all the neutral weak charge operators and their quantization, once the diagonalization of the neutral boson mass matrix is properly performed. Our results open up the path to a rich and promising phenomenological outcome. All the Standard Model phenomenology is recovered by simply decoupling the latter's scale ( $v_{S M} = 246$ GeV) from the higher scale ( $V \sim$ 10 TeV) specific to our new electro-weak unification.
hep-phPTEP(2022)·1 citation
18*
Associated production of heavy Higgs bosons with a $b b ˉ$ pair in the Nonholomorphic MSSM and LHC searches
Utpal Chattopadhyay🇮🇳 · AseshKrishna Datta🇮🇳 · Samadrita Mukherjee🇮🇳 · Abhaya Kumar Swain🇿🇦
In the NonHolomorphic Supersymmetric Standard Model (NHSSM), the Yukawa couplings of the bottom quark ( $y_{b}$ ) and the tau lepton ( $y_{τ}$ ) might receive substantial supersymmetric (SUSY) radiative corrections which have prominent dependencies on the NHSSM-specific trilinear soft parameters, $A_{b}^{'}$ and $A_{τ}^{'}$ , respectively, in addition to their well-known dependence on $tan β$ as is already present in the Minimal SUSY Standard Model (MSSM). We study to what extent these could affect the production cross sections of the heavy Higgs bosons ( $H$ and $A$ ) in association with a pair of $b$ -quarks and their decay branching ratios, in particular, to a $τ τ ˉ$ pair and compare them with those obtained in the MSSM. Requiring compliance with the recently observed upper bounds on the product of their total cross-section and the branching ratio to $τ τ ˉ$ at the 13 TeV run of the Large Hadron Collider (LHC), with data worth 139 fb $^{- 1}$ , results in an altered exclusion region in the customary $m_{A} - tan β$ plane in the framework of the NHSSM when compared to what is derived by the LHC experiments within an MSSM setup. Such alterations are estimated to be pronounced only for large $tan β$ ( $\geq 40$ ) and for large, negative $A_{b}^{'}$ when one finds a reinforced exclusion of the $m_{A} - tan β$ plane with an excluded $m_{A}$ value larger by $\approx 200$ GeV, compared to the MSSM case, at $tan β = 60$ . On the other hand, the maximum relaxation in $m_{A}$ , for a similarly large but positive $A_{b}^{'}$ , barely exceeds $\approx 100$ GeV as a result of complementary variations in production cross-sections and decay branching fractions of the heavy, neutral Higgs bosons.
hep-phhep-exJHEP(2022)·8 citations
19*
Cosmological effects of Peccei-Quinn symmetry breaking on QCD axion dark matter
Kwang Sik Jeong🇰🇷 · Kohei Matsukawa🇯🇵 · Shota Nakagawa🇯🇵 · Fuminobu Takahashi🇯🇵
We study cosmological effects of explicit Peccei-Quinn breaking on the QCD axion dark matter. We find that the axion abundance decreases or increases significantly depending on the initial position, even for a tiny Peccei-Quinn breaking that satisfies the experimental bound of the neutron electric dipole measurements. If the axion first starts to oscillate around a wrong vacuum and if it gets trapped there until the false vacuum disappears due to non-perturbative QCD effects, its abundance increases significantly and is independent of the decay constant $f_{a}$ , as first pointed out in [JHEP 06 (2016) 150]. Thus, the axion produced by the trapping mechanism can explain dark matter even when the decay constant is close to the lower limit due to stellar cooling arguments. On the other hand, if the axion starts to oscillate about a potential minimum close to the low-energy vacuum, its abundance is significantly reduced because of the adiabatic suppression mechanism. This relaxes the upper limit of the axion window to large values of $f_{a}$ . We also discuss how the axionic isocurvature perturbation is affected by the Peccei-Quinn breaking term, and show that it can be suppressed in both regimes. In particular, the isocurvature bound on the inflation scale is relaxed by many orders of magnitudes for $f_{a} ≲ 1 0^{11} GeV$ compared to the conventional scenario.
hep-phastro-ph.COJCAP(2022)·33 citations
20*
Investigation of anomalous triple gauge couplings in $μ γ$ collision at multi-TeV muon colliders
S. Spor🇹🇷 · M. Köksal🇹🇷
The pursuit of discovery in particle physics has always required study at the highest possible energies. Multi-TeV muon colliders, which have important advantages, offer unprecedented potential for investigating new physics beyond the Standard Model. We extensively assume a range of center-of-mass energies from 3 to 30 TeV and a range of integrated luminosities from 1 to 90 ab $^{- 1}$ for future multi-TeV muon colliders. We perform a phenomenological study of the anomalous $W W γ$ couplings via the process $μ^{+} μ^{-} \to μ^{+} γ^{*} μ^{-} \to μ^{+} ℓ^{-} ν_{ℓ} ν ˉ_{ℓ}$ using a model-independent analysis in the effective field theory framework at multi-TeV muon colliders. The sensitivity estimates obtained for the anomalous $W W γ$ couplings at systematic uncertainties of $δ_{sy s} = 0$ , $3$ , $5%$ are compared with the experimental results. Our best sensitivity limits at 95 $%$ confidence level for $c_{W W W} / Λ^{2}$ , $c_{W W W} / Λ^{2}$ , $c_{B} / Λ^{2}$ , $c_{W} / Λ^{2}$ and $c_{W} / Λ^{2}$ couplings are $[- 0.030; 0.025] TeV^{- 2}$ , $[- 0.014; 0.014] TeV^{- 2}$ , $[- 0.185; 0.187] TeV^{- 2}$ , $[- 0.187; 0.189] TeV^{- 2}$ and $[- 1.177; 1.097] TeV^{- 2}$ at the multi-TeV muon collider with center-of-mass energy of 30 TeV and integrated luminosity of 90 ab $^{- 1}$ , respectively.
hep-phCan.J.Phys.(2023)·9 citations
21*
Multi-phase critical Higgs boson at colliders
Katri Huitu🇫🇮 · Kristjan Kannike🇪🇪 · Niko Koivunen🇪🇪 · Luca Marzola🇪🇪 · Subhadeep Mondal🇮🇳 · Martti Raidal🇪🇪
The recently proposed multi-phase criticality principle in Coleman-Weinberg models can provide a new explanation for the hierarchy between the electroweak and new physics scales. When applied to the Standard Model, a Higgs boson as light as the pseudo-Goldstone boson of broken scale invariance occurs. The suppressed mixing between the two light fields still carries information about the large scale of symmetry breaking, albeit up to logarithmic corrections. In this work we probe this scenario with the present LHC data and assess the impact of future lepton and hadron colliders. Our results show that the multi-phase criticality can easily explain the apparent absence of new physics at the energy scales tested in current experiments.
hep-phPRD(2022)·9 citations
22*
Dressed propagators, fakeon self-energy and peak uncertainty
Damiano Anselmi🇮🇹
We study the resummation of self-energy diagrams into dressed propagators in the case of purely virtual particles and compare the results with those obtained for physical particles and ghosts. The three geometric series differ by infinitely many contact terms, which do not admit well-defined sums. The peak region, which is outside the convergence domain, can only be reached in the case of physical particles, thanks to analyticity. In the other cases, nonperturbative effects become important. To clarify the matter, we introduce the energy resolution $Δ E$ around the peak and argue that a "peak uncertainty" $Δ E ≳ Δ E_{min} ≃ Γ_{f} /2$ around energies $E ≃ m_{f}$ expresses the impossibility to approach the fakeon too closely, $m_{f}$ being the fakeon mass and $Γ_{f}$ being the fakeon width. The introduction of $Δ E$ is also crucial to explain the observation of unstable long-lived particles, like the muon. Indeed, by the common energy-time uncertainty relation, such particles are also affected by ill-defined sums at $Δ E = 0$ , whenever we separate their observation from the observation of their decay products. We study the regime of large $Γ_{f}$ , which applies to collider physics (and situations like the one of the $Z$ boson), and the regime of small $Γ_{f}$ , which applies to quantum gravity (and situations like the one of the muon).
hep-phhep-thJHEP(2020)·11 citations
23*
Topological confinement in Skyrme holography
Casey Cartwright🇺🇸 · Benjamin Harms🇺🇸 · Matthias Kaminski🇺🇸 · Ronny Thomale🇩🇪
We study phase transitions in five-dimensional Einstein Gravity with a negative cosmological constant, coupled to a Skyrme matter field. These transitions are topological generalizations of the Hawking-Page transition between thermal Anti de Sitter (AdS) spacetime and an AdS black hole. Phases are characterized by a topological number associated with the Skyrme field configuration. Depending on that topological number and on the Skyrme coupling strength, there occur transitions between those phases at two, one, or no value(s) of the temperature. Through the holographic (AdS/CFT) correspondence, these solutions are dual to topologically non-trivial states in a conformal field theory (CFT) with an SU(2)-symmetry, which support either confined or deconfined (quasi-)particles at strong coupling. We compare to similar known phase transitions, and discuss potential applications to confinement in topological phases of condensed matter and the quark-gluon plasma.
↳ hep-thcond-mat.str-elhep-phnucl-thClass.Quant.Grav.(2022)·3 citations
24*
Halliday-Suranyi Approach to the Anharmonic Oscillator
Nabin Bhatta🇺🇸 · Tatsu Takeuchi🇺🇸
In this contribution to Peter Suranyi Festschrift, we study the Halliday-Suranyi perturbation method for calculating the energy eigenvalues of the quartic anharmonic oscillator.
↳ math-phhep-phmath.MPquant-ph0 citations
25*
Observational constraints on nonlinear matter extensions of general relativity
E.-A. Kolonia🇬🇷 · C. J. A. P. Martins🇵🇹
We present a phenomenological analysis of current observational constraints on classes of FLRW cosmological models in which the matter side of Einstein's equations includes, in addition to the canonical term, a term proportional to some function of the energy-momentum tensor ( $T^{2} = T_{α β} T^{α β} = ρ^{2} + 3 p^{2}$ ), or of its trace ( $T = ρ - 3 p$ ). Qualitatively, one may think of these models as extensions of general relativity with a nonlinear matter Lagrangian. As such they are somewhat different from the usual dynamical dark energy or modified gravity models: in the former class of models one adds further dynamical degrees of freedom to the Lagrangian (often in the form of scalar fields), while in the latter the gravitational part of the Lagrangian is changed. We study both of these models under two different scenarios: (1) as phenomenological two-parameter or three-parameter extensions of the standard $Λ$ CDM, in which case the model still has a cosmological constant but the nonlinear matter Lagrangian leads to additional terms in Einstein's equations, which cosmological observations tightly constrain, and (2) as alternatives to $Λ$ CDM, where there is no cosmological constant, and the nonlinear matter term would have to provide the acceleration (which would be somewhat closer in spirit to the usual modified gravity models). A comparative analysis of the observational constraints obtained in the various cases provides some insight on the level of robustness of the $Λ$ model and on the parameter space still available for phenomenological alternatives.
↳ astro-ph.COgr-qchep-ph2 citations
26*
Ultra-low-frequency gravitational waves from individual supermassive black hole binaries as standard sirens
Ling-Feng Wang🇺🇸 · Yue Shao🇺🇸 · Si-Ren Xiao🇺🇸 · Jing-Fei Zhang🇨🇳 · Xin Zhang🇨🇳
Ultra-low-frequency gravitational waves (GWs) generated by individual inspiraling supermassive black hole binaries (SMBHBs) at the centers of galaxies may be detected by pulsar timing arrays (PTAs) in the future. These GW signals, which encode absolute cosmic distances, can serve as bright and dark sirens, potentially evolving into a precise cosmological probe. Here, we show that a PTA in the era of the Square Kilometre Array, comprising 100 millisecond pulsars, could potentially detect about 25 bright sirens and 41 dark sirens over a 10-year observation period. The bright sirens, combined with cosmic microwave background data, offer capabilities comparable to current mainstream joint cosmological observations for measuring the equation of state of dark energy. The dark sirens could achieve a measurement precision of the Hubble constant close to that of current distance-ladder observations. Our results suggest that ultra-low-frequency GWs from individual SMBHBs are of great significance in investigating the nature of dark energy and determining the Hubble constant.
↳ astro-ph.COgr-qchep-phJCAP(2025)·37 citations
27*
Bruno Touschek and the physics at Frascati at the time of AdA and ADONE
Mario Greco🇮🇹
The physics at Frascati in the years 60's - 70's is reviewed together with the role played by Bruno Touschek
↳ physics.hist-phhep-phSpringer Proc.Phys.(2023)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.