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Beyond the Standard Model: LHC Phenomenology, Cosmology from Post-Inflationary Sources, and Dark Matter Physics
High Energy Physics - Phenomenology · Submitted 24 Aug 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim It is the goal of this dissertation to demonstrate that beyond the standard model, certain theories exist which solve conflicts between observation and theory -- conflicts such as massive neutrinos, dark matter, unstable Higgs vacuum, and recent Planck observations of excess relativistic degrees of freedom in the early universe.
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It is the goal of this dissertation to demonstrate that beyond the standard model, certain theories exist which solve conflicts between observation and theory -- conflicts such as massive neutrinos, dark matter, unstable Higgs vacuum, and recent Planck observations of excess relativistic degrees of freedom in the early universe. Theories explored include a D-brane inspired construct of U(3) X Sp(1) X U(1) X U(1) extension of the standard model, in which we demonstrate several possible observables that may be detected at the LHC, and an ability to stabilize the Higgs mechanism. The extended model can also explain recent Planck data which, when added to HST data gives an excess of relativistic degrees of freedom of \Delta N = 0.574 +- 0.25 above the standard result. Also explored is a possible non-thermal dark matter model for explanation of this result. Recent observations of Fermi bubble results indicate a signal of a 50 GeV dark matter particle annihilating into b b-bar, with a thermally averaged annihilation cross section corresponding to < \sigma v> = 8 X 10^(-27) cm^3/s, spurs interest in a Higgs portal model suggested by Steven Weinberg. Other implications of this model are also explored such as its ability to explain dark matter direct detection results along with LHC Higgs data, and Planck data. Particle physics is complimented by possible stochastic gravitational wave searches for which a model of second order global phase transitions is explored. These transitions generate gravitational wave spectra with amplitudes of order \Omega_{gw} h^2 = 10^(-24) - 10^(-15). Furthermore, techniques into such calculations are investigated in hopes to improve the stability required in such lattice simulations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | It is the goal of this dissertation to demonstrate that beyond the standard model, certain theories exist which solve conflicts between observation and theory -- conflicts such as massive neutrinos, dark matter, unstable Higgs vacuum, and recent Planck observations of excess relativistic degrees of freedom in the early universe. | contribution 0.74 | 0.15 | 0.34 | asserted 0.84 |
| s1 | Theories explored include a D-brane inspired construct of U(3) X Sp(1) X U(1) X U(1) extension of the standard model, in which we demonstrate several possible observables that may be detected at the LHC, and an ability to stabilize the Higgs mechanism. | contribution 0.93 | 0.84 | 0.09 | asserted 0.53 |
| s2 | The extended model can also explain recent Planck data which, when added to HST data gives an excess of relativistic degrees of freedom of \Delta N = 0.574 +- 0.25 above the standard result. | result 0.78 | 0.45 | 0.10 | asserted 0.93 |
| s3 | Also explored is a possible non-thermal dark matter model for explanation of this result. | contribution 0.97 | 0.53 | 0.04 | hedged possibility 0.92 |
| s4 | Recent observations of Fermi bubble results indicate a signal of a 50 GeV dark matter particle annihilating into b b-bar, with a thermally averaged annihilation cross section corresponding to < \sigma v> = 8 X 10^(-27) cm^3/s, spurs interest in a Higgs portal model suggested by Steven Weinberg. | background 0.82 | 0.09 | 0.04 | hedged possibility 0.76 |
| s5 | Other implications of this model are also explored such as its ability to explain dark matter direct detection results along with LHC Higgs data, and Planck data. | contribution 0.65 | 0.63 | 0.06 | hedged possibility 0.49 |
| s6 | Particle physics is complimented by possible stochastic gravitational wave searches for which a model of second order global phase transitions is explored. | contribution 0.93 | 0.50 | 0.03 | hedged possibility 0.92 |
| s7 | These transitions generate gravitational wave spectra with amplitudes of order \Omega_{gw} h^2 = 10^(-24) - 10^(-15). | result 0.98 | 0.63 | 0.05 | asserted 1.00 |
| s8 | Furthermore, techniques into such calculations are investigated in hopes to improve the stability required in such lattice simulations. | future work 0.34 | 0.48 | 0.03 | hedged possibility 0.56 |
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The paper
Original abstract
It is the goal of this dissertation to demonstrate that beyond the standard model, certain theories exist which solve conflicts between observation and theory -- conflicts such as massive neutrinos, dark matter, unstable Higgs vacuum, and recent Planck observations of excess relativistic degrees of freedom in the early universe. Theories explored include a D-brane inspired construct of U(3) X Sp(1) X U(1) X U(1) extension of the standard model, in which we demonstrate several possible observables that may be detected at the LHC, and an ability to stabilize the Higgs mechanism. The extended model can also explain recent Planck data which, when added to HST data gives an excess of relativistic degrees of freedom of \Delta N = 0.574 +- 0.25 above the standard result. Also explored is a possible non-thermal dark matter model for explanation of this result. Recent observations of Fermi bubble results indicate a signal of a 50 GeV dark matter particle annihilating into b b-bar, with a thermally averaged annihilation cross section corresponding to < \sigma v> = 8 X 10^(-27) cm^3/s, spurs interest in a Higgs portal model suggested by Steven Weinberg. Other implications of this model are also explored such as its ability to explain dark matter direct detection results along with LHC Higgs data, and Planck data. Particle physics is complimented by possible stochastic gravitational wave searches for which a model of second order global phase transitions is explored. These transitions generate gravitational wave spectra with amplitudes of order \Omega_{gw} h^2 = 10^(-24) - 10^(-15). Furthermore, techniques into such calculations are investigated in hopes to improve the stability required in such lattice simulations.
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What this paper does with the arXiv papers it cites
What it cites · 215 sentences without a confident label
Builds on 3 papers
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These results, which are displayed in Fig. [ref], extend previous exclusion limits from runs at $√(s) = 7 TeV$ done in LHC7 [ref] .
Search for Resonances in the Dijet Mass Spectrum from 7 TeV pp Collisions at CMS · Dijet and Dilepton LHC $Z”$ Phenomenology · 0.86
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These results, which are displayed in Fig. [ref], extend previous exclusion limits from runs at $√(s) = 7 TeV$ done in LHC7 [ref] .
Search for New Physics in the Dijet Mass Distribution using 1 fb^-1 of pp Collision Data at sqrt(s) = 7 TeV collected by the ATLAS Detector · Dijet and Dilepton LHC $Z”$ Phenomenology · 0.86
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These results, which are displayed in Fig. [ref], extend previous exclusion limits from runs at $√(s) = 7 TeV$ done in LHC7 [ref] .
Search for Dijet Resonances in 7 TeV pp Collisions at CMS · Dijet and Dilepton LHC $Z”$ Phenomenology · 0.86
Uses the method or tool of 11 papers
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To obtain the matching conditions connecting the two theories so that they reflect a consistent theory, we can follow [ref] and integrate out the field $H”$ to obtain the effective Lagrangian of the form ([ref]).
Stabilization of the Electroweak Vacuum by a Scalar Threshold Effect · RG Equations of SM$^++$ · 0.98
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We accomplish this via an $SO(3)$ matrix, or a rotation, parameterized by three Euler angles as is shown below $θ, ψ, ϕ$ [ref] [equation] where we have $C_θ= cos(θ)$ and $S_ψ= sin(ψ)$ and similar notation for the other angles.
Stringy origin of Tevatron Wjj anomaly · The Effective Lagrangian · 0.87
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To find the couplings down at the TeV region we must use $U(1)$ running equations given by [equation] [equation] where [equation] with $f$ and $s$ indicating contribution from fermion and scalar loops, respectively [ref] .
Z'-gauge Bosons as Harbingers of Low Mass Strings · Branching Ratios of $Z'$ and $Z”$ · 0.83
Uses data or values from 29 papers
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This excess results from combing data from the Planck, and the Hubble Space Telescope result of $h = 0.738 ±0.024$ [ref] , yielding $ΔN = 0.574 ±0.25$.
A 3% Solution: Determination of the Hubble Constant with the Hubble Space Telescope and Wide Field Camera 3 · Introduction · 1.00
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The CDM is cold dark matter, which accounts for $26.5%$ of the matter content of the universe [ref] .
Planck 2013 results. XVI. Cosmological parameters · Introduction · 0.98
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For the required branching into $τ^+ τ^-$ of about 10% – as given by ([ref]) – existing data constrain the dark matter spin-independent elastic scattering cross section with protons to be less than $4 ×10^-41 cm^2$ [ref] .
The New DAMA Dark-Matter Window and Energetic-Neutrino Searches · Higgs Portal to the Dark Sector and WIMPS · 0.89
Compares with 4 papers
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We can compare the numerical results we obtained from simulation with the analytic arguments of [ref] and [ref] , where in both cases the authors use the model presented here to estimate the gravitational wave signal from the domain interactions.
A Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase Transitions · Results of the Simulation · 1.00
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We can compare the numerical results we obtained from simulation with the analytic arguments of [ref] and [ref] , where in both cases the authors use the model presented here to estimate the gravitational wave signal from the domain interactions.
Gravitational waves from self-ordering scalar fields · Results of the Simulation · 1.00
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We can compare the numerical results we obtained from simulation with the analytic arguments of [ref] and [ref] , where in both cases the authors use the model presented here to estimate the gravitational wave signal from the domain interactions.
Probing the Gravitational Wave Signature from Cosmic Phase Transitions at Different Scales · Results of the Simulation · 1.00
Cites as support 3 papers
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The stability of SM$^++$ vacuum is then nearly independent of the $Z”$ branching fractions [ref] .
LHC Phenomenology and Cosmology of String-Inspired Intersecting D-Brane Models · Running the Couplings · 0.96
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This orthogonality relation of equation ([ref]) was shown to be true to the one loop order in ref [ref] .
Z'-gauge Bosons as Harbingers of Low Mass Strings · The Effective Lagrangian · 0.98
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One such dramatic example is that of the bullet cluster collision that demonstrates through lensing effects that dark matter interacts with visible matter weakly [ref] as seen in Fig. [ref].
Direct constraints on the dark matter self-interaction cross-section from the merging galaxy cluster 1E0657-56 · Dark Matter Particles · 0.97
Cites as background 14 papers
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For a review of the see-saw mechanism, see [ref] .
Phenomenology with Massive Neutrinos · The Higgs Mechanism · 0.95
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(ii) models based on active-sterile mixing of neutrinos in a heat bath [ref] .
Cosmology seeking friendship with sterile neutrinos · Adding New Species · 0.80
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(ii) models based on active-sterile mixing of neutrinos in a heat bath [ref] .
Neutrinos, WMAP, and BBN · Adding New Species · 0.80
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