437 research outputs found
Tree-level Quartic for a Holographic Composite Higgs
We present a new class of composite Higgs models where an adjustable
tree-level Higgs quartic coupling allows for a significant reduction in the
tuning of the Higgs potential. Our 5D warped space implementation is the first
example of a holographic composite Higgs model with a tree-level quartic. It is
inspired by a 6D model where the quartic originates from the Tr [A_5,A_6]^2
term of the gauge field strength, the same model that led to the original
little Higgs construction of Arkani-Hamed, Cohen, and Georgi. Beyond the
reduction of the tuning and the standard composite Higgs signatures, the model
predicts a doubling of the KK states with relatively small splittings as well
as a Higgs sector with two doublets in the decoupling limit.Comment: 22 pages, 4 figure
The Quantum Spectral Method: From Atomic Orbitals to Classical Self-Force
We present the Quantum Spectral Method for the analytical calculation of
observables in classical periodic and quasi-periodic systems. It is based on a
novel application of the correspondence principle, in which classical Fourier
coefficients are obtained as the limit of quantum matrix
elements. Our method is particularly suited for self-force calculations for
inspiralling bodies, where it could, for the first time, provide fully
analytical expressions. We demonstrate our method by calculating an adiabatic
electromagnetic inspiral, along with its associated radiation, at all orders in
the multipole expansion
Continuum Naturalness
We present a novel class of composite Higgs models in which the top and gauge
partners responsible for cutting off the Higgs quadratic divergences form a
continuum. The continuum states are characterized by their spectral densities,
which should have a finite gap for realistic models. We present a concrete
example based on a warped extra dimension with a linear dilaton, where this
finite gap appears naturally. We derive the spectral densities in this model
and calculate the full Higgs potential for a phenomenologically viable
benchmark point, with percent level tuning. The continuum top and gauge
partners in this model evade all resonance searches at the LHC and yield
qualitatively different collider signals
Massive vector particle tunneling from Kerr-Newman-de Sitter black hole under generalized uncertainty principle
The quantum tunneling of charged massive vector boson particles across the
event horizon of Kerr-Newman-de Sitter black hole is investigated under the
influence of quantum gravity effects. The modified Hawking temperatures and
heat capacities across the event horizon of KNdS black hole are derived in
3-dimensional and 4-dimensional frame dragging coordinates. It is found that
due to quantum gravity effects the modified Hawking temperatures and heat
capacities depend on the mass and angular momentum of the emitted vector boson
particles. For 3-dimensional KNdS black hole, the modified Hawking temperature
is lower than the original Hawking temperature but the modified heat capacity
is higher than the original heat capacity due to quantum gravity effects. In
the case of 4-dimensional KNdS black hole, the modified Hawking temperature and
heat capacity are lower or greater than the original Hawking temperature and
heat capacity depending upon the choices of black hole parameters due to
quantum gravity effects. We also discuss the remnant and graphical analysis of
the modified Hawking temperatures and heat capacities
The Radial Action from Probe Amplitudes to All Orders
We extract the relativistic classical radial action from scattering
amplitudes, to all orders in perturbation theory, in the probe limit. Our
sources include point charges and monopoles, as well as the Schwarzschild and
pure-NUT gravitational backgrounds. A characteristic relativistic effect, that
scattering trajectories may wind around these sources any number of times, can
be recovered when all-order amplitudes are available. We show that the
amplitude for scattering a probe off a pure NUT is given by the solution of a
transcendental equation involving continued fractions, and explain how to solve
this equation to any desired loop order
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