In effective field theories it is common to identify the onset of new physics with violation tree-level unitarity. However, we show that this parametrically incorrect in case chiral perturbation theory, and probably theoretically general. explore perturbative unitarity as a function number colors flavors, holding scale "new physics" (i.e. QCD) fixed. This demonstrates uncorrelated tree-unitarity violation. When latter lower than physics, theory must heal its itself, which expected because...

Motivated by the ${R}_{{D}^{(*)}}$ anomalies, we investigate an SO(10) grand unification scenario where a charge $\ensuremath{-}1/3$ scalar leptoquark (${S}_{1}$) remains as only new physics candidate at TeV scale. This along with Standard Model (SM) Higgs doublet originates from same ten-dimensional real multiplet in framework taking its mass close to electroweak We explicitly show how gauge coupling is achieved one intermediate symmetry-breaking scale which Pati-Salam group broken into SM...

Motivated by possible scalar-leptoquark explanations of the recently reported $B$-decay anomalies, we investigate whether required leptoquarks can be accommodated within models based on noncommutative geometry (NCG). The considered have gauge structure Pati-Salam models, $SU(4)\times SU(2)_L\times SU(2)_R$, with coupling unification at a single scale. In one find unique scalar leptoquark quantum numbers $(3,1,-\frac{1}{3})_{321}$, originating from complex multiplet $(6,1,1)_{422}$, which...

We investigate the possibility of TeV-scale scalars as low energy remnants arising in non-supersymmetric $\mathrm{SO}(10)$ grand unification framework where field content is minimal. consider a scenario gauge symmetry broken into Standard Model (SM) through multiple stages breaking, and colored hypercharged scalar $\chi$ picks mass process. The last stage breaking occurs at TeV scale left-right symmetry, i.e. $\mathrm{SU}(2)_L\otimes \mathrm{SU}(2)_R\otimes \mathrm{U}(1)_{B-L}\otimes...

We analyze the compatibility of unified left–right symmetric Pati–Salam models motivated by noncommutative geometry and TeV-scale right-handed [Formula: see text] boson suggested recent LHC data. find that unification/matching conditions place conflicting demands on symmetry breaking scales generating required mass coupling is nontrivial.

If general relativity is an emergent phenomenon, there may be small violations of diffeomorphism invariance. We propose a phenomenology perturbatively by the inclusion terms which break covariance. These can tested matching to parameterized post-Newtonian formalism. The most sensitive tests involve pulsar timing and provide extremely strong bound, with dimensionless constraint order ${10}^{\ensuremath{-}20}$ relative gravitational strength.

We discuss the physical implications of formulating Standard Model (SM) in terms superconnection formalism involving superalgebra su(2/1). In particular, we prediction Higgs mass according to and point out that it is ~170 GeV, clear disagreement with experiment. To remedy this problem, extend su(2/2), which extends SM left-right symmetric model (LRSM) accommodates a ~126 GeV Higgs. Both su(2/1) case LRSM su(2/2) are argued emerge at ~4 TeV from an underlying theory spacetime geometry...

Primordial black holes that survive until the present have been considered as a dark matter candidate. In this paper we argue primordial 2-2-hole remnants provide more promising and testable option. 2-2-holes arise in quadratic gravity new family of classical solutions for ultracompact distributions they possess hole exterior without an event horizon. They may serve endpoint gravitational collapse, providing resolution information loss problem. Intriguing thermodynamic behavior is found...

We discuss a possible interpretation of the $750$ GeV diphoton resonance, recently reported at LHC, within class $SU(2)_L\times SU(2)_R\times SU(4)$ models with gauge coupling unification. The unification is imposed by underlying non-commutative geometry (NCG), which in these extended to left-right symmetric completion Standard Model (SM). Within such \textit{unified} Higgs content restrictively determined from NCG, instead being arbitrarily selected. show that observed cross sections...

We investigate the physical implications of formulating electroweak (EW) part Standard Model (SM) in terms a superconnection involving supergroup SU(2/1). In particular, we relate observed Higgs mass to new physics at around 4 TeV. The ultraviolet incompleteness approach points its emergent nature. beyond SM is associated with SU(2/2), which natural from point view Pati–Salam model. Given that group robust certain constructions string vacua, these results suggest deeper connection between...

We analyze the compatibility of recent LHC signals and TeV-scale left-right model(s) in minimal nonsupersymmetric $SO(10)$ framework. show that models which Higgs content is selected based on extended survival hypothesis do not allow $W_R$ boson to be at TeV-scale. By relaxing this conjecture, we investigate various scenarios where a number colored-scalars, originated from Pati-Salam multiplets, are light whence they survive down low energies. Performing detailed renormalization group...

Abstract With the recent progress in observations of astrophysical black holes, it has become more important to understand detail physics strongly gravitating horizonless objects. If objects identified are indeed and ultracompact, high curvature effects may important, their explorations be intimately related new beyond General Relativity (GR). In this paper, we revisit concept statistical thermodynamics curved spacetime, focusing on self-gravitating compact systems without event horizons....

Abstract Primordial black holes have been considered attractive dark matter candidates, whereas some of the predictions rely heavily on near-horizon physics that remains to be tested experimentally. As a concrete alternative, thermal 2-2-holes closely resemble without event horizons. Being probable endpoint gravitational collapse, they provide solution information loss problem but also naturally result in stable remnants. Previously, we primordial 2-2-hole remnants as matter. Owing strong...

The Spectral Action Principle in noncommutative geometry derives the actions of Standard Model and General Relativity (along with several other gravitational terms) by reconciling them a geometric setting, hence offers an explanation for their common origin. However, one requirements minimal formalism, unification gauge coupling constants, is not satisfied, since basic construction does introduce anything new that can change renormalization group (RG) running Model. On hand, it has been...

We investigate the effects of an early cosmological period dominated by primordial 2-2holes on axion dark matter.The 2-2-holes emerge as a new family horizonless classical solutions for ultracompact matter distributions in quadratic gravity, candidate theory quantum gravity.Thermal 2-2-holes, sourced relativistic thermal gas, exhibit Hawkinglike radiation and fulfill entropy-area law before they become remnants with almost no radiation.In this paper, we consider remnant contribution to (DM)...

Breaking diffeomorphism invariance has been motivated in the literature on several grounds, including emergence of General Relativity (GR). For this to be a reliable possibility, theory with minor violations general covariance, healthy behavior is required that only slightly different from GR. In paper, cosmological evolution scale factor gravity broken covariance investigated (modified) Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) spacetime. The model augments GR Lagrangian all...

We discuss a possible scale of gravitational origin at around $10$ MeV, or $10^{-12}$ cm, which arises in the MacDowell-Mansouri formalism gravity due to topological Gauss-Bonnet term action, as pointed out by Bjorken several years ago. A length same size emerges also Kodama solution gravity, is known be closely related formulation. particularly draw attention intriguing incident that existence six compact extra dimensions originated from TeV-scale quantum well points compactification scale....

We explore the available parameter space of minimal vectorial Standard Model. In this theory, gauge currents are initially but Higgs sector produces chiral mass eigenstates, leading to a set heavy right-handed mirror particles. describe phenomenology residual and suggest that model will be readily tested at LHC.

We discuss the astrophysical and cosmological implications of having primordial thermal 2-2-hole remnants as dark matter. Thermal 2-2-holes emanate in quadratic gravity horizonless classical solutions for ultracompact distributions relativistic gas. In contrast to a large that imitates thermodynamic behaviour black hole, small at late stages evaporation behaves stable remnant with mass approaching minimal value. These all matter can satisfy corresponding observational constraints provided...

We present an example of a gauge-invariant Lagrangian that contains four derivatives and describes one massive, nonghostlike, degree freedom.Received 19 October 2010DOI:https://doi.org/10.1103/PhysRevD.83.063516© 2011 American Physical Society

We motivate the concept of emergent gauge symmetry and discuss ways that this can be tested.The key idea is if a emergent, one should look for small violations because underlying fundamental theory does not contain symmetry.We describe our recent work implementing in gravity sector.We also reasons why may well linked to Lorentz invariance.

We discuss a possible scale of gravitational origin at around 10 MeV, or 10−12 cm, which arises in the MacDowell-Mansouri formalism gravity due to topological Gauss-Bonnet term action, as pointed out by Bjorken several years ago.~A length same size emerges also Kodama solution gravity, is known be closely related formulation. particularly draw attention intriguing incident that existence six compact extra dimensions originated from TeV-scale quantum well points compactification...

We discuss a possible scale of gravitational origin at around 10 MeV, or 10−12 cm, arisen in the MacDowell-Mansouri formalism gravity due to topological Gauss-Bonnet term action, pointed out by Bjorken several years ago. A length same size emerges also Kodama solution gravity, which is known be closely related formulation. particularly draw attention intriguing incident that existence six compact extra dimensions originated from TeV-scale quantum as well points compactification...