Tony Gherghetta

Warped Phenomenology in the Holographic Basis (2007)

We present a solution of the five-dimensional gravity-dilaton-tachyon equations of motion with a pure AdS_5 metric and a quadratic dilaton and linear tachyon in conformal coordinates. This leads to...

Holographic Mixing Quantified (2007)

The holographic basis is a novel tool which allows for a quantitative description of elementary/composite mixing in holographic duals of warped models. We apply this tool to bulk fermions in a slice...

Warped Leptogenesis with Dirac Neutrino Masses (2007)

We compute the precise elementary/composite field content of mass eigenstates in holographic duals of warped models in a slice of AdS_5. This is accomplished by decomposing the bulk fields not in the...

Gherghetta, Tony, Kadota, Kenji, Yamaguchi, Masahide

We show how leptogenesis can occur at the TeV scale with neutrinos that possess almost purely Dirac masses and negligible Majorana mass contributions as a consequence of the small wavefunction...

A Gravity Dual and LHC Study of Single-Sector Supersymmetry Breaking (2007)

Gabella, Maxime, Gherghetta, Tony, Giedt, Joel

We propose a gravitational dual of ``single-sector'' models of supersymmetry breaking which contain no messenger sector and naturally explain the scale of supersymmetry breaking and the fermion mass...

Yang-Mills Localization in Warped Space (2006)

Bulk fields in $AdS_5$ from probe D7 branes (2006)

We present a mechanism to localize zero mode non-Abelian gauge fields in a slice of AdS_5. As in the U(1) case, bulk and boundary mass terms allow for a massless mode with an exponential profile that...

Gherghetta, Tony, Giedt, J

We relate bulk fields in Randall-Sundrum AdS_5 phenomenological models to the world-volume fields of probe D7 branes in the Klebanov-Witten background of type IIB string theory. The string...

Bulk fields in AdS_5 from probe D7 branes (2006)

Gherghetta, Tony, Giedt, Joel

We relate bulk fields in Randall-Sundrum AdS_5 phenomenological models to the world-volume fields of probe D7 branes in the Klebanov-Witten background of type IIB string theory. The string...

Les Houches Lectures on Warped Models and Holography (2006)

Localized U(1) Gauge Fields, Millicharged Particles, and Holography (2005)

The theoretical tools required to construct models in warped extra dimensions are presented. This includes how to localise zero modes in the warped bulk and how to obtain the holographic...

Emergent Gravity from a Mass Deformation in Warped Spacetime (2005)

We consider U(1) gauge fields in a slice of AdS_5 with bulk and boundary mass parameters. The zero mode of a bulk U(1) gauge field can be localized either on the UV or IR brane. This leads to a...

Gherghetta, Tony, Peloso, Marco, Poppitz, Erich

We consider a deformation of five-dimensional warped gravity with bulk and boundary mass terms to quadratic order in the action. We show that massless zero modes occur for special choices of the...

A Calculable Toy Model of the Landscape (2004)

Partly Supersymmetric Grand Unification (2004)

Motivated by recent discussions of the string-theory landscape, we propose field-theoretic realizations of models with large numbers of vacua. These models contain multiple U(1) gauge groups, and can...

6th Workshop on Continuous Advances in QCD 2004 (2004)

It is shown how grand unification can occur in models which are partly supersymmetric. The particle states which are composite do not contribute to the running of gauge couplings above the...

Vector/tensor duality in the five dimensional supersymmetric Green-Schwarz mechanism (2004)

Dudas, Emilian, Gherghetta, Tony, Nibbelink, Stefan Groot

The five dimensional version of the Green-Schwarz mechanism can be invoked to cancel U(1) anomalies on the boundaries of brane world models. In five dimensions there are two dual descriptions that...

Dirac Neutrino Masses with Planck Scale Lepton Number Violation (2003)

The Standard Model Partly Supersymmetric (2003)

It is shown how pure Dirac neutrino masses can naturally occur at low energies even in the presence of Planck scale lepton number violation. The geometrical picture in five dimensions assumes that...

Anomaly Cancellation in Seven-Dimensional Supergravity with a Boundary (2002)

We present a novel class of theories where supersymmetry is only preserved in a partial (non-isolated) sector. The supersymmetric sector consists of CFT bound-states that can coexist with fundamental...

Gherghetta, Tony, Kehagias, Alex

We construct a seven-dimensional brane world in a slice of AdS_7, where the boundary matter content is fixed by the cancellation of anomalies. The seven-dimensional minimal N=2 gauged supergravity is...

Anomaly-Free Brane Worlds in Seven Dimensions (2002)

Gherghetta, Tony, Kehagias, Alex

We present an orbifold compactification of the minimal seven dimensional supergravity. The vacuum is a slice of AdS_7 where six-branes of opposite tension are located at the orbifold fixed points....

GUT Precursors and Non-Trivial Fixed Points in Higher-Dimensional Gauge Theories (2002)

Preserving the Lepton Asymmetry in the Brane World (2002)

Within the context of traditional logarithmic grand unification at M_GUT = 10^(16) GeV, we show that it is nevertheless possible to observe certain GUT states such as X and Y gauge bosons at lower...

Demir, D. A., Gherghetta, Tony, Olive, Keith A.

In models where the Standard Model spectrum is localized on a brane embedded in a higher dimensional spacetime, we discuss the lepton number violation induced by the emission of right-handed...

A Stuckelberg formalism for the gravitino from warped extra dimensions (2002)

Gravity-Mediated Supersymmetry Breaking in the Brane-World (2001)

We consider supersymmetric theories with a warped extra dimension where supersymmetry is broken by boundary conditions that preserve an R-symmetry. It is shown that this supersymmetry breaking...

Gherghetta, Tony, Riotto, Antonio

We study the transmission of supersymmetry breaking via gravitational interactions in a five-dimensional brane-world compactified on $S^1/Z_2$. We assume that chiral matter and gauge fields are...

Gravity-Mediated Supersymmetry Breaking in the Brane World (2001)

Gherghetta, Tony, Riotto, Antonio

We study the transmission of supersymmetry breaking via gravitational interactions in a five-dimensional brane-world compactified on $S^1/Z_2$. We assume that chiral matter and gauge fields are...

Supergravity, Non-Conformal Field Theories and Brane-Worlds (2001)

Gherghetta, Tony, Oz, Y

We consider the supergravity dual descriptions of non-conformal super Yang-Mills theories realized on the world-volume of Dp-branes. We use the dual description to compute stress-energy tensor and...

Supergravity, Non-Conformal Field Theories and Brane-Worlds (2001)

Gherghetta, Tony, Oz, Yaron

We consider the supergravity dual descriptions of non-conformal super Yang-Mills theories realized on the world-volume of Dp-branes. We use the dual description to compute stress-energy tensor and...

A Warped Supersymmetric Standard Model (2001)

Gherghetta, Tony, Pomarol, A

We study the breaking of supersymmetry in five-dimensional (5d) warped spaces, using the Randall-Sundrum model as a prototype. In particular, we present a supersymmetry-breaking mechanism which has a...

A Warped Supersymmetric Standard Model (2000)

Localizing Gravity on a 3-brane in Higher Dimensions (2000)

We study the breaking of supersymmetry in five-dimensional (5d) warped spaces, using the Randall-Sundrum model as a prototype. In particular, we present a supersymmetry-breaking mechanism which has a...

Localizing Gravity on a 3-brane in Higher Dimensions (2000)

We present metric solutions in six and higher dimensions with a bulk cosmological constant, where gravity is localized on a 3-brane. The corrections to four-dimensional gravity from the bulk...

Living Inside a Hedgehog: Higher-dimensional Solutions that Localize Gravity (2000)

We present metric solutions in six and higher dimensions with a bulk cosmological constant, where gravity is localized on a 3-brane. The corrections to four-dimensional gravity from the bulk...

Gherghetta, Tony, Rössle, E, Shaposhnikov, Mikhail E

We consider spherically symmetric higher-dimensional solutions of Einstein's equations with a bulk cosmological constant and n transverse dimensions. In contrast to the case of one or two extra...

Living Inside a Hedgehog: Higher-dimensional Solutions that Localize Gravity (2000)

Gherghetta, Tony, Roessl, Ewald, Shaposhnikov, Mikhail

We consider spherically symmetric higher-dimensional solutions of Einstein's equations with a bulk cosmological constant and n transverse dimensions. In contrast to the case of one or two extra...

Localizing Gravity on a String-Like Defect in Six Dimensions (2000)

Gherghetta, Tony, Shaposhnikov, Mikhail E

We present a metric solution in six dimensions where gravity is localized on a four-dimensional singular string-like defect. The corrections to four-dimensional gravity from the bulk continuum modes...

Localizing Gravity on a String-Like Defect in Six Dimensions (2000)

Gherghetta, Tony, Shaposhnikov, Mikhail

We present a metric solution in six dimensions where gravity is localized on a four-dimensional singular string-like defect. The corrections to four-dimensional gravity from the bulk continuum modes...

Bulk Fields and Supersymmetry in a Slice of AdS (2000)

Gherghetta, Tony, Pomarol, A

Five-dimensional models where the bulk is a slice of AdS have the virtue of solving the hierarchy problem. The electroweak scale is generated by a ``warp'' factor of the induced metric on the brane...

Bulk Fields and Supersymmetry in a Slice of AdS (2000)

Invisible Axions and Large-Radius Compactifications (1999)

Five-dimensional models where the bulk is a slice of AdS have the virtue of solving the hierarchy problem. The electroweak scale is generated by a ``warp'' factor of the induced metric on the brane...

Invisible Axions and Large-Radius Compactifications (1999)

We study some of the novel effects that arise when the QCD axion is placed in the ``bulk'' of large extra spacetime dimensions. First, we find that the mass of the axion can become independent of the...

Anomaly-Induced Gauge Unification and Brane/Bulk Couplings in Gravity-Localized Theories (1999)

We study some of the novel effects that arise when the QCD axion is placed in the ``bulk'' of large extra spacetime dimensions. First, we find that the mass of the axion can become independent of the...

Anomaly-Induced Gauge Unification and Brane/Bulk Couplings in Gravity-Localized Theories (1999)

It has recently been proposed that gravity-localized compactifications can generate the required gauge hierarchy without the need for hierarchically large extra spacetime dimensions. In this paper,...

Phenomenological consequences of supersymmetry with anomaly-induced masses (1999)

It has recently been proposed that gravity-localized compactifications can generate the required gauge hierarchy without the need for hierarchically large extra spacetime dimensions. In this paper,...

Gherghetta, Tony, Giudice, Gian Francesco, Wells, J D

In the supersymmetric standard model there exist pure gravity contributions to the soft mass parameters which arise via the superconformal anomaly. We consider the low-energy phenomenology with a...

Phenomenological consequences of supersymmetry with anomaly-induced masses (1999)

Gherghetta, Tony, Giudice, Gian F., Wells, James D.

In the supersymmetric standard model there exist pure gravity contributions to the soft mass parameters which arise via the superconformal anomaly. We consider the low-energy phenomenology with a...

The power of extra dimensions (1999)

Light Neutrinos without Heavy Mass Scales: A Higher-Dimensional Seesaw Mechanism (1998)

Light Neutrinos without Heavy Mass Scales: A Higher-Dimensional Seesaw Mechanism (1998)

Recent theoretical developments have shown that extra spacetime dimensions can lower the fundamental GUT, Planck, and string scales. However, recent evidence for neutrino oscillations suggests the...

Cosmological Phase Transitions and Radius Stabilization in Higher Dimensions (1998)

Recent theoretical developments have shown that extra spacetime dimensions can lower the fundamental GUT, Planck, and string scales. However, recent evidence for neutrino oscillations suggests the...

Dienes, Keith R, Dudas, E A, Gherghetta, Tony, Riotto, Antonio

Recently there has been considerable interest in field theories and string theories with large extra spacetime dimensions. In this paper, we explore the role of such extra dimensions for cosmology,...

Cosmological Phase Transitions and Radius Stabilization in Higher Dimensions (1998)

Dienes, Keith R., Dudas, Emilian, Gherghetta, Tony, Riotto, Antonio

Recently there has been considerable interest in field theories and string theories with large extra spacetime dimensions. In this paper, we explore the role of such extra dimensions for cosmology,...

Nucleosynthesis Bounds in Gauge-Mediated Supersymmetry Breaking Theories (1998)

Gherghetta, Tony, Giudice, Gian Francesco, Riotto, Antonio

In gauge-mediated supersymmetry breaking theories the next-to-lightest supersymmetric particle can decay during or after the nucleosynthesis epoch. The decay products such as photons and hadrons can...

TeV-scale GUTs (1998)

In this talk, we summarize our recent proposal for lowering the scale of grand unification to the TeV range though the appearance of extra spacetime dimensions. Particular emphasis is placed on the...

TeV-scale GUTs (1998)

Grand Unification at Intermediate Mass Scales through Extra Dimensions (1998)

In this talk, we summarize our recent proposal for lowering the scale of grand unification to the TeV range though the appearance of extra spacetime dimensions. Particular emphasis is placed on the...

Grand Unification at Intermediate Mass Scales through Extra Dimensions (1998)

One of the drawbacks of conventional grand unification scenarios has been that the unification scale is too high to permit direct exploration. In this paper, we show that the unification scale can be...

The Supersymmetric Flavour and CP Problems from a Cosmological Perspective (1998)

One of the drawbacks of conventional grand unification scenarios has been that the unification scale is too high to permit direct exploration. In this paper, we show that the unification scale can be...

Gherghetta, Tony, Riotto, Antonio, Roszkowski, Leszek

The supersymmetric flavour and CP problems can be avoided if the first two generations of sfermions are heavier than a few TeV. However, using flavour and CP-violating constraints on the third...

The Supersymmetric Flavour and CP Problems From a Cosmological Perspective (1998)

Gherghetta, Tony, Riotto, Antonio, Roszkowski, Leszek

The supersymmetric flavour and CP problems can be avoided if the first two generations of sfermions are heavier than a few TeV and approximately degenerate in mass. However using flavour and...

Extra Spacetime Dimensions and Unification (1998)

Extra Spacetime Dimensions and Unification (1998)

We study the effects of extra spacetime dimensions at intermediate mass scales, as expected in string theories with large-radius compactifications, and focus on the gauge and Yukawa couplings within...

The Role of Scalar and Pseudoscalar Fields in Determining Nucleosynthesis Bounds on the Scale of Supersymmetry Breaking (1997)

We study the effects of extra spacetime dimensions at intermediate mass scales, as expected in string theories with large-radius compactifications, and focus on the gauge and Yukawa couplings within...

The Role of Scalar and Pseudoscalar Fields in Determining Nucleosynthesis Bounds on the Scale of Supersymmetry Breaking (1997)

The effect of spin-0 goldstino superpartners is considered on the nucleosynthesis bounds arising when a superlight gravitino appears as an effective massless neutrino species. When the scalar and...

Supersymmetric Contributions to the Decay of an Extra Z Boson (1997)

The effect of spin-0 goldstino superpartners is considered on the nucleosynthesis bounds arising when a superlight gravitino appears as an effective massless neutrino species. When the scalar and...

Gherghetta, Tony, Kaeding, Thomas A., Kane, Gordon L.

We analyse in detail the supersymmetric contributions to the decay of an extra Z boson in effective rank 5 models, including the important effect of D-terms on sfermion masses. The inclusion of...

Goldstino Decoupling in Spontaneously Broken Supergravity Theories (1996)

Moduli Inflation with Large Scale Structure Produced by Topological Defects (1995)

If the gravitino is sufficiently light and stable it will behave as an effective massless neutrino species at the time of nucleosynthesis. Depending on the temperature at which it decouples from the...

Freese, Katherine, Gherghetta, Tony, Umeda, Hideyuki

It is tempting to inflate along one of the many flat directions that arise in supersymmetric theories. The required flatness of the potential to obtain sufficient inflation and to not overproduce...

Low-Energy Supersymmetry Breaking and Fermion Mass Hierarchies (1995)

Gherghetta, Tony, Jungman, Gerard, Poppitz, Erich

In models with low-energy supersymmetry breaking, an anomalous Abelian horizontal gauge symmetry can simultaneously explain the fermion mass hierarchy and the values of the $\mu$ and $B$ terms. We...

Flat directions in the scalar potential of the supersymmetric standard model (1995)

Gherghetta, Tony, Kolda, Chris, Martin, Stephen P.

The scalar potential of the Minimal Supersymmetric Standard Model (MSSM) is nearly flat along many directions in field space. We provide a catalog of the flat directions of the renormalizable and...

Chaotic inflation and a radiatively generated intermediate scale in the supersymmetric standard model (1995)

Gherghetta, Tony, Kane, Gordon L.

We consider a phenomenological extension of the minimal supersymmetric standard model which incorporates chaotic inflation and a radiatively generated intermediate mass scale. Initially a period of...

Regularization in the Gauged Nambu--Jona-Lasinio Model (1994)