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The AdS/CFT duality provides a correspondence between correlation functions at weak coupling on the gravity side and at strong coupling for its field theory counterpart. However correlation functions are notably hard to compute in this regime, and I report on how modern analytical bootstrap methods can be used in order to derive defect two-point functions up to next-to-leading order, by using...
I will discuss the growth of quantum fluctuations of an axion field rolling down a potential with multiple minima. This effect is particularly relevant for the relaxion mechanism, in which provides an alternarive stopping mechanism, thus modifying the relevant parameter space. I will present new lattice results, and discuss some cosmological aspects.
3d N=4 theories are of particular interest as they admit various types of twists (topological-holomorphic). A framework with interesting implications is the one of topologically twisted 3d N=4 theories with holomorphic boundaries/defects. The significance of these configurations relies on the fact that local boundary operators form special Vertex operator algebras, the study of which can...
To solve the hierarchy problem, the relaxion must remain trapped in the correct minimum, even if the electroweak symmetry is restored after reheating. In this scenario, the relaxion starts rolling again until the backreaction potential, with its set of local minima, reappears. Depending on the time of barrier reappearance, Hubble friction alone may be insufficient to retrap the relaxion in a...
I will discuss confinement in 4d $\mathcal{N=1}$ $SU(N)$ Super-Yang Mills from a holographic point of view, focusing on the 1-form symmetry and its relation to chiral symmetry breaking. We will see how to identify the topological couplings that determine the 1-form symmetry and its ’t Hooft anomalies from the 5d supergravity dual, obtained by truncation of the Klebanov-Strassler solution. One...
We study the thermal production of axions over different scales especially around the QCD and electroweak phase transitions in the early universe. We focus on the most motivated axion models (KSVZ and DFSZ) and investigate how the thermal history can influence on the production rate of hot axion as dark radiation. This can lead to predictions for the future measurements of the cosmic microwave...
The calculation of the solar axion flux has recently generated much attention, and it has been realised that axions can be powerful tools for studying solar metal abundances and magnetic fields.
The feasibility of such studies depends on our ability to accurately predict the solar axion flux. In this talk, I will present an overview of solar models and opacity codes and summarise the...
In this talk, I will review our recent progress on the characterization of multipoint conformal blocks in any spacetime dimension $d$ and any OPE channel.
Our approach extends the standard four-point Casimir equations, introduced by Dolan and Osborn, to a set of higher-point eigenvalue equations of commuting operators that also measure quantum numbers associated with vertices of OPE diagrams....
The conformal bootstrap is a powerful, nonperturbative method to study
conformal field theories (CFTs). Advancements in especially the numerical bootstrap have led to extremely precise results for the computation of critical exponents in various CFTs, and the conformal bootstrap
has gained a lot of attention in recent years. The conformal bootstrap can be
generalized/modified to include...
In radiative seesaw models such as the famous scotogenic model, neutrino masses are generated through loop contributions involving dark matter (DM) particles. We study the capture of these DM candidates in the Sun as well as their subsequent annihilation into SM neutrinos and compute the expected event rates at IceCube in its 86-string configuration. In particular, in the scotogenic model the...
This talk would be based on the paper by Sebastian Hoof, David J. E. Marsh and myself, that was uploaded on arXiv recently (https://arxiv.org/abs/2108.09563).
We review results from QCD axion string and domain wall simulations and propagate the associ-
ated uncertainties into the calculation of the axion relic density. This allows us to compare different
results in the literature and,...
We use analytical bootstrap techniques to study supersymmetric monodromy de-
fects in the critical Wess-Zumino model. In preparation for our main result we first study two related systems which are interesting on their own: general monodromy defects (no susy), and the ε–expansion bootstrap for the Wess-Zumino model (no defects). For general monodromy defects we discuss some subtleties...
A fast-spinning axion can dominate the Universe at early times and generates the so-called kination era. The presence of kination imprints a smoking-gun spectral enhancement in the primordial gravitational wave (GW) background. Current and future-planned GW observatories could constrain particle theories that generate the kination phase. Surprisingly, the viable parameter space allows for a...
Coherent Elastic Neutrino Nucleus Scattering (CE$\nu$NS) provide a novel window to probe new physics connected with the well established non-vanishing neutrino masses. In this talk we will discuss how in the presence of a transition magnetic moment of neutrinos the CE𝜈NS experiments have the potential to shed light on the nature of neutrinos: Dirac vs Majorana. In particular, we will take the...
In this brief talk I will show how to compute the CFT data and the four-point function in 1D CFTs from unitarity. First I will review the OPE inversion formula, which allows to recover the spectrum and OPE coefficients from the double discontinuity of a Regge bounded four-point function. Then I will explain how to use it to find the CFT data in a perturbative expansion around Generalized Free...
Axion-like particles (ALPs) are leading dark matter candidates originally motivated by the strong CP problem and also arise in theories of string compactifications. We present a sensitive probe for ALPs as ultra-light dark matter - the birefringence in the cosmic microwave background (CMB). Birefringence arises from the oscillating ALP field's inhomogeneity and is also relevant for laboratory...
One dimensional CFTs are an exceptional laboratory in which we can test novel techniques in order to solve higher dimensional CFTs. They are also interesting from an holographic point of view, as in the case of conformal line defects in 4d N=4 Super Yang-Mills. In this short talk, I will present a recursive prescription to compute, up to one loop, 4d N=4 SYM n-point correlation functions...
In this work, we have studied the production of baryon asymmetry and gravitino dark matter in contemporary times from the decay of the same source. In accomplishing a physical model to study these phenomenologies we have considered R-parity violating SUSY and the decay of Bino like neutralino which generates the baryon asymmetry and DM. In continuation of the previous work, we have added here...
Fragmentation of the axion field may produce the observed DM abundance, which makes it possible for ALP DM to appear with lower values of the axion decay constant than those allowed by the conventional misalignment mechanism. Previously, kinetic misalignment has been proposed to open up this parameter space. We find that for a large range of parameters the field becomes fragmented before...
The Festina Lente (FL) bound arises from demanding that very large charged black holes in universes with a positive cosmological constant must decay without becoming singular. The FL bound states that the mass of all charged states is bounded from below by a scale set by the vacuum energy.
In this talk, I will first review the argument for the FL bound from charged black hole decay. I will...
We investigate the potential of type II supernovae (SNe) to constrain axion-like particles (ALPs) coupled simultaneously to nucleons and electrons. ALPs coupled to nucleons can be efficiently produced in the SN core via nucleon-nucleon bremsstrahlung and, for a wide range of parameters, leave the SN unhindered, producing a large ALP flux.
For masses exceeding 1 MeV, these ALPs would decay...
6D SCFTs admit a plethora of global symmetries that
specify subtle global properties, such as 2-form symmetries.
When coupled to gravity those symmetries are expected to be
either broken or gauged.
In this talk I present a simple geometric condition for the
later option to be the case that is applicable to (2,0) and
(1,0) theories. I give further evidence by relating such examples to...
Light-cone distribution amplitudes (LCDAs) of light and heavy mesons are universal hadronic objects that form an essential part of factorization theorems for hard exclusive particle decays. These are relevant for precise calculations of Standard Model processes which play an important role in the search for New Physics. Like parton distribution functions, LCDAs are process-independent...
Recently, the Planck 2018 polarization data of cosmic microwave background (CMB) radiation suggested the non-zero rotation angle of CMB polarization plane $\beta=0.35\pm0.14 {\rm deg}$, which is called cosmic birefringence. Cosmic birefringence is predicted if an axion-like particle (ALP) moves after the recombination. We show that this naturally happens if the ALP is coupled to the dark...
We derive correlation functions for massive fermions with a complex mass in the presence of a general vacuum angle. For this purpose, we first build the Green’s functions in the one-instanton background and then sum over the configurations of background instantons. The quantization of topological sectors follows for saddle points of finite Euclidean action in an infinite spacetime volume and...
Type IIB supergravity famously has a discrete duality group,
which is an exact symmetry of the full type IIB string theory. This
symmetry has potential quantum anomalies, which could render the theory
inconsistent. In this talk I will describe how we computed these
anomalies in recent work, and show they are nonvanishing, but
remarkably, they can be cancelled by a subtle modification of...
In this talk, we reanalyze the multi-component strongly interacting massive particle (mSIMP) scenario using an effective operator approach. As in the single-component SIMP case, the total relic abundance of mSIMP dark matter (DM) is determined by the coupling strengths of $3 \to 2$ processes achieved by a five-point effective operator. Intriguingly, we find that there is an unavoidable $2 \to...
The direct detection of sub-GeV dark matter interacting with nucleons is hampered by the low recoil energies induced by scatterings in the detectors. This experimental difficulty is avoided in the scenario of boosted dark matter where a component of dark matter particles is endowed with large kinetic energies. In this Letter, we point out that the current evaporation of primordial black holes...
In this talk we discuss a novel approach to moduli stabilization in Type IIB flux compactifications. Our strategy relies on recent insights about Calabi-Yau moduli spaces based on asymptotic Hodge theory. The crucial observation is that exponential corrections must be present near most boundaries in these moduli spaces. We then use these corrections to engineer new flux vacua with an...
We propose a novel mechanism for the production of dark matter (DM) from a thermal bath, based on the idea that DM particles $\chi$ can transform heat bath particles $\psi$: $\chi \psi \rightarrow \chi \chi$. For a small initial abundance of $\chi$ this leads to an exponential growth of the DM number density, in close analogy to other familiar exponential growth processes in nature. We...
Obtaining string compactifications where the KK scale is much higher than the cosmological constant scale is quite challenging. Such a separation of scales is however necessary for the theory to be genuinely lower-dimensional.
In massive type IIA string theory there are such scale-separated vacua, e.g. the DGKT AdS$_4$ solutions. It has been shown recently that the classical orientifold...
We demonstrate the impact of non-perturbative effects on the Dark Matter (DM) production mechanism in simplified t-channel DM models. Specifically, we study the case of a Majorana fermion DM, coupled to the standard model (SM) quarks via a colored scalar.
For DM masses in the GeV-TeV range, direct detection experiments strongly constrain the DM coupling to the SM quarks. From a cosmological...
In this talk I will review how the anomalous magnetic moment of the muon and the B anomalies can be addressed by a combined explanation, by means of loop models characterized by minimal field content. Moreover, I will show how some of these model can also provide a viable DM candidate, accounting for the measured relic density while evading direct and indirect DM constraints.
In this talk, we will provide a comprehensive analysis of the prospect to realize Dark Matter (DM) and to enhance the Electroweak PhaseTransition (EWPhT) with an Inert Doublet. Taking the latest constraints from collider physics and direct-detection experiments into account, we will investigate the possibility of a strong first-order EWPhT via one or two steps in combination with a significant...
Scattering amplitudes in quantum field theories have intricate analytic properties as functions of the energies and momenta of the scattered particles. In perturbation theory, their singularity structure is governed by nonlinear polynomial systems known as Landau equations. In this work we introduce several tools from computational algebraic geometry to solving Landau equations for any...
We consider multiverse models in two-dimensional linear dilaton-gravity theories as toy models of false vacuum eternal inflation. Coupling conformal matter we calculate the Von Neumann entropy of subregions. When these are sufficiently large we find that an island develops covering most of the rest of the multiverse, leading to a Page-like transition. This resonates with a description of...
This work is about a duality between two seemingly unrelated objects. The hypersimplex $\Delta_{k+1,n}$ -- a polytope of dimension $n-1$ in $\mathbb{R}^n$ -- has been the center of attention of both mathematicians and physicists, in connection with the moment map, torus orbits in the Grassmannian, tropical geometry and cluster algebras. Meanwhile, the amplituhedron $\mathcal{A}_{n,k,2}$ --...
We consider the possibility that the majority of dark matter in our Universe consists of black holes of primordial origin. We examine the effects of stochastic inflation and an early matter-dominated era on the abundance of these black holes. We show that the power spectrum of comoving curvature perturbations computed in stochastic inflation matches the result obtained by solving the...
Two-body non-leptonic $B$ decays with heavy-light final states, like $B_s \to D \pi$ and $B \to D K$, are among the theoretically cleanest non-leptonic decays as penguin loops do not contribute. They can be described using QCD factorization which relies on the heavy quark expansion. Advancing the theoretical calculations of such decays requires also a careful analysis of QED effects. In this...
In this talk we will analyse loop corrections to a conformally coupled scalar field with a quartic self-interaction in $(A)dS_4$ from a holographic perspective. First we will remark on the similarities and differences of quantum field theory in $AdS$ and $dS$. We will then calculate the quantum corrections to the four point function and give a formula for the anomalous dimensions of the dual...
In this talk, we will present a renormalizable polynomial inflation model, focusing on the small field scenario. We show that the CMB data can be fitted perfectly with a perturbated inflection-point. In particular, the running of the spectral index is predicted to be $\alpha \simeq -1.43 \times 10^{-3}$, which could be tested by next generation CMB experiment. We also analyze reheating...
The Minimal R-symmetric Supersymmetric Standard Model possesses interesting features, which makes it an attractive alternative to the MSSM. Some of them can be observed in and are reflected by the lepton flavour violation processes. Notably, there is no $\tan\beta$-enhancement for $g-2$ of the muon and other dipole operators, resulting in very different predictions for lepton observables...
The observation of stochastic gravitational wave backgrounds from first-order phase transitions in the early Universe is promising to become a feasible test for high energy physics. In this talk, I will show how observable signals can be obtained from strong first-order phase transitions in a dark sector. If the dark sector is initially without thermal contact to the particle species of the...
11D supergravity has been conjectured to be the low-energy limit of a fundamental theory, also known as M-Theory, which would contain non-perturbative information of string theory. In this talk, I will discuss the so-called 11D pure spinor superparticle whose quantization describes 11D supergravity in its antifield formulation. Since scattering amplitudes require the introduction of vertex...
A mechanism for the formation of primordial black holes is proposed. Here, heavy quarks of a confining gauge theory produced by de Sitter fluctuations are pushed apart by inflation and get confined after horizon re-entry. The large amount of energy stored in the QCD string connecting the quark pair leads to black-hole formation. These are much lighter and can be of higher spin than those...
Hierarchical masses of quarks and leptons are addressed by imposing horizontal symmetries. In supersymmetric Standard Models, the same symmetries play a role in suppressing flavor violating processes induced by supersymmetric particles. Combining the idea of spontaneous CP violation to control contributions to electric dipole moments (EDMs), the mass scale of supersymmetric particles can be...
We revisit the computation of string correlation functions in AdS3 with pure NS-NS flux from a worldsheet point of view. These correlators contain all the perturbative information about the spacetime CFT and the existence of winding strings in AdS3 makes them very rich. We propose a solution to the problem of computing these correlators. The winding correlators encode information about...
We discuss the interplay of wave package decoherence and decoherence induced by quantum gravity via interactions with spacetime foam for high energy astrophysical neutrinos. In this context we point out a compelling consequence of the expectation that quantum gravity should break global symmetries, namely that quantum-gravity induced decoherence can provide both a powerful tool for the search...
In general it is extremely difficult to obtain exact non-perturbative information about the operator product expansion (OPE) of a given CFT. In this quest protected sectors play an incredibly important role as in some cases they allow us to obtain the full answer for a subset of the operators in the theory. Important examples of this phenomenon occur in 4d $\mathcal{N}=2$ and 6d...
The bubble wall velocity in first-order cosmological phase transitions is crucial for phenomenological studies of, for example, the production of stochastic gravitational waves and electroweak baryogenesis. It is commonly expected that a friction force on the bubble wall can only arise from out-of-equilibrium effects. Here we study the bubble wall motion in local thermal equilibrium. We...
In this talk, I will talk about the Post-Newtonian expansion of the gravitational three-body effective potential at the 2nd Post-Minkowskian order. At order 2PM a formal result is given in terms of a differential operator acting on the maximal generalized cut of the one-loop triangle integral. We perform the PN expansion unambiguously at the level of the integrand. Finding agreement with the...
Primordial black holes hypothetically generated in the first instants of life of the Universe are potential dark matter candidates. Focusing on primordial black holes masses in the range $[5 \times 10^{14} − 5\times 10^{15}]$g, we point out that the neutrinos emitted by primordial black holes evaporation can interact through the coherent elastic neutrino-nucleus scattering producing an...
Extensions of the two higgs doublet models with a singlet scalar can easily accommodate all current experimental constraints and are highly motivated candidates for Beyond Standard Model Physics. It can successfully provide a dark matter candidate, explain baryogenesis and provide gravitational wave signals. In this work, we focus on the dark matter phenomenology of the two higgs doublet model...
We construct the complete (planar and non-planar) integrand for the
six-loop four-point amplitude in maximal $D\le10$ super-Yang-Mills.
This construction employs new advances to help combat the
proliferation of state-sums and loops in the evaluation of
multi-loop $D$-dimensional unitarity cuts. Concretely, we introduce
two graph-based approaches, applicable in a range of...
Breaking of a $U(1)_{B-L}$ local symmetry, a feature that occurs in a wide variety of the Standard Model ultraviolet completions, can lead to generation of cosmic strings which can lead to an observable signal in gravitational waves (GWs). In this talk we will discuss how the GWs can be used to probe leptogenesis mechanism due to heavy neutrino decay. In particular, we will look into the...
In this talk, I will discuss the one-loop correction to the static potential induced by photon, Z or W-boson exchange at tree-level for arbitrary SM multiplets. The correction is relevant, e.g., in the Sommerfeld effect calculation for heavy WIMP annihilation. We discuss the "Casimir-like" scaling of the result that makes the NLO correction a "low-energy" property of the SM gauge bosons....
In this talk I will show how concepts from Calabi-Yau geometry and especially Calabi-Yau motives can be used for computations of multi-loop Feynman integrals. This will be exemplified with the so called banana graphs. First, I will give a short introduction to Feynman integrals and Calabi-Yau manifolds. Then we will see how the mathematics of Calabi-Yau manifolds (variations of Hodge...
The fractional dark energy (FDE) model describes the accelerated expansion of the Universe through a non-relativistic gas of particles with a non-canonical kinetic term. This term is proportional to the absolute value of the three-momentum to the power of 3w, where w is simply the dark energy equation of state parameter, and the corresponding energy leads to an energy density that mimics the...
We investigated stau-antistau annihilation into heavy quarks in the phenomenological MSSM within the DM@NLO collaboration. This SUSY-QCD precision calculation, enhanced by a QED Sommerfeld resummation, turned out to have several interesting applications: Claiming the lightest neutralino to be a main dark matter constituent, there are promising, non-excluded SUSY scenarios that...
I discuss to what extend LISA can observe features of gravitational wave spectra originating from cosmological first-order phase transitions. I focus on spectra which are of the form of double-broken power laws. These spectra are predicted by hydrodynamic simulations and also analytical models such as the sound shell model. I argue that the ratio of the two break frequencies is an interesting...
Non-geometric solutions of type IIB supergravity - called S-folds - have recently attracted a lot of attention. They are of particular interest as they can easily be seen as solutions of 4D and 5D gauged maximal supergravity. Moreover, they are conjectured to be the holographic dual of certain localized interfaces in SYM$_4$.
In this talk we will review such solutions and focus on their...
We present a study of spin-2 mediated scalar dark matter. As a blueprint, we work in a warped extra-dimensional model such that the mediator(s) are the massive spin-2 Kaluza-Klein (KK) modes of the 5D graviton. On top of Standard Model particles, we focus on dark matter annihilations into KK-gravitons. Due to the longitudinal modes of the massive gravitons, any truncation of the KK-tower leads...
Appearance of cosmic strings in the early Universe is a common manifestation of new physics typically linked to some high energy scale. In this talk, I will discuss a different situation, where a model underlying cosmic string formation is approximately scale free. String tension is naturally related to the square of the temperature of the hot primordial plasma in such a setting, and hence...
In three spacetime dimensions certain gravitational and gauge theories are `third way' consistent. This means that their equations of motion are only on-shell consistent and do not come from the variation of an action which contains the dynamical field alone. Although this mechanism is not special to 3d, no higher dimensional third way consistent theory was known. In this talk, I will...
Based on reasonable assumptions, we propose a new expression for Lloyd's bound, which confines the complexity growth of charged black holes. We then compute the holographic complexity for charged black branes in the presence of a finite cutoff using complexity = action proposal. We argue that a behind-the-horizon cutoff is inevitable. Using the proposed Lloyd's bound, we find a relation...
Long-lived particles appear in the Standard Model (SM) and are a common feature of its hidden sector extensions.
The accelerator phenomenology of such models is dominated by the often long-lived messenger fields, as they interact directly with the SM.
Portal effective field theories, extend the usual effective theories of the SM to include generic interactions with messenger fields to...
Intensity Mapping (IM) of line emission targets the Universe from present
time up to redshifts beyond ten when the Universe reionized and the first
galaxies formed, from small to largest scales. Similar to CMB measurements,
the power spectra of intensity fluctuations inform about the underlying cosmology;
imagine the information encoded in thousands of intensity maps at
different...
We argue that in extended supergravity, de Sitter ctitical points with light charged gravitini violate the magnetic weak gravity conjecture. We prove this statement in general for N=2 matter-coupled gauged supergravity and demonstrate the result and its caveats through various examples. This result is required by the "festina lente" bound, but is derived independently, and thus serves as a...
The $\sigma_8$-tension of Planck data with weak lensing and redshift surveys is one of the main problems with the $\Lambda$CDM model of cosmology. We show that the tension can be alleviated by introducing an interaction between dark matter and neutrinos. We model the interaction using a linear Boltzmann treatment, introducing a novel implementation that for the first time uses the full massive...
We provide a string theoretical explanation of fuzzy dark matter as composed by ultra-light axions coming from the compactification of type IIB string theory on Calabi-yau manifolds. In particular, we consider C_4 axions stabilased in a Large Volume Scenario, and thraxions, axionic modes living in warped throats of the internal manifold. Based on the latest bounds, we study how likely is for...
Hidden sector induced light meson transitions are a powerful probe for new physics at low-energy fixed target experiments such as NA62. To help study such interactions, we use the portal effective theory framework to construct a portal chiral perturbation theory at leading order that couples the light pseudoscalar mesons to a gauge-singlet messenger of spin 0, 1/2, or 1. We then compute...
The recent very-high-energy (VHE) gamma-ray observations of gamma-ray bursts (GRBs) in their afterglow phase motivate a review of the established fireball model in which a relativistic blast wave accelerates electrons in the forward shock, which then radiate via the synchrotron process and inverse Compton scattering on these synchrotron photons (synchrotron self-Compton). We use the rich...
Axion fields coupled to gravity allow non-trivial Euclidean saddle points that correspond to wormholes. Their possible role in the path integral of quantum gravity has been a puzzle for over 30 years. In this talk I will first explain that these saddle points are unstable in a Euclidean sense even when additional axion or saxion fields are added. Secondly, the meaning of these instabilities...
Analytical models of structure formation are an important tool, complementary to N-body simulations, to investigate the formation of Dark Matter structures and the dependence of their statistics on cosmological parameters. They rely on some non-linear map, typically inferred from spherical collapse, to relate topological features of the initial density field (number of maxima, minima, saddles,...
We conjecture that in a consistent supergravity theory with non-vanishing gravitino mass, the limit $m_{3/2}→0$ is at infinite distance. In particular one can write $m_{tower}∼m^δ_{3/2}$ so that as the gravitino mass goes to zero, a tower of KK states as well as emergent strings becomes tensionless. This conjecture may be motivated from the Weak Gravity Conjecture as applied to strings and...
Universal relationships between asymptotic symmetries, QFT soft theorems, and low energy observables have reinvigorated attempts at formulating a holographic correspondence for flat spacetimes. In this talk, I will review recent advances in the celestial holography proposal, where the 4d S-matrix is reconsidered as a 2d correlator on the celestial sphere at null infinity.
In this proposed talk, we present a gauge-Higgs grand unification setup that employs 5D warped space with a SU(6) bulk gauge field that includes both a SU(5) grand unified theory (GUT) and a Higgs sector as a scalar component of the 5D vector field, solving the hierarchy problem. By appropriately breaking the gauge symmetry on the boundaries of the extra dimension the issue of light exotic new...
We propose a new mechanism for baryogenesis, in which baryon asymmetry is generated by absorption of a new particle $X$ carrying baryon number onto Primordial Black Holes (PBHs). Due to CP violation of $X$ and $\overline{X}$ scattering with the plasma surrounding PBHs, the two conjugate particles are differently absorbed by PBHs, leading to the production of an asymmetry in the $X$ sector. The...
I will report on recent progress in bootstrapping the $\alpha'$-expansion of the genus-zero four-point superstring amplitude on AdS_5, dual to correlation functions of N=4 SYM at strong coupling. The construction of these amplitudes goes hand in hand with a deeper understanding of the spectrum of double-trace operators. As I will explain, at the level of supergravity these operators exhibit an...
We examine phenomenological properties of a heavy axion by considering small size instanton effects coming from an additional axicolor non-Abelian gauge group. To properly take instanton effects into account, we develop a new method to derive and diagonalize the mass matrix of pseudoscalar fields of the theory. Applying our new method for theories without axicolor instanton effects leads to...
In the recent years, Leptogenesis and Electroweak Baryogenesis have been a developing ground for non-equilibrium thermal quantum field theory techniques. In particular, the generation of a CP asymmetry can be described in terms of the Schwinger-Dyson (SD) equations evaluated over a closed time path (CTP) in the Schwinger-Keldysh formalism. Based on this SD approach the equations of motion for...
The discovery of integrability in planar N=4 sYM theory led to considerable advances in the computation of planar anomalous dimensions. In this talk I will discuss universal statistical properties of anomalous-dimension spectra in sYM theories in the planar limit and at finite rank of the gauge group. I will show how they can give insight into the nature of the underlying model, in particular...
Axion-like particles (ALPs) are ubiquitous in models of new physics explaining some of the most
pressing puzzles of the Standard Model. However, until relatively recently, little attention has been
paid to its interplay with flavour. In this work, we study in detail the phenomenology of ALPs
that exclusively interact with up-type quarks at the tree-level, which arise in some...
Neutron-antineutron ($n$-$\bar{n}$) oscillation is a baryon number violating process that will be probed at an unprecedented sensitivity in near future experiments at ESS and DUNE. We study potential impacts of the $n$-$\bar{n}$ oscillation mechanism on the baryon asymmetry of the Universe. Using an effective field theory framework, as well as a simplified model for one of two possible...
I will review the Standard Model Effective Field Theories (SMEFT) from purely on-shell arguments. Starting from few basics assumptions such as Poincaré invariance and locality, it is possible to classify all the renormalizable and non-renormalizable interactions at the lowest order in the couplings. From these building blocks, locality and unitarity enforce Lie algebra structures to appear in...
The Standard Model (SM) suffers from five shortcomings: Dark Matter, Neutrino masses and mixing, Baryon asymmetry, Strong CP-Problem and Inflation. The latter is regarded as the seeds for structure formation. In this talk, we introduce an inflationary $\nu$DFSZ-type model which is dubbed 2hdSMASH(Two-Higgs-Doublet SMAxionSeesaw*Higgs-Portal-Inflation). 2hdSMASH aims at giving a complete and...
I will discuss a recently proposed class of models where Dark Matter (DM) is produced via an inverse phase transition. The inverse phase transition can be caused by coupling to some cosmological field. For instance, this field can be the Ricci scalar, as in e-Print: 2004.03410; primordial magnetic field, as in e-Print: 2010.03383; or thermal fluctuations of other fields, as in e-Print:...
