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Deng, Chengrong; Ping, J. L.; Yang, Yibo; Wang, Fan

doi:10.1103/physrevd.86.014008

Cited by 65 publications

(80 citation statements)

References 63 publications

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“…Although a number of authors have obtained partial results in scalar-tensor theory at 2PN order, notably the metric sufficient to study light deflection at 2PN order [45,46], and the generic structure of the 2PN Lagrangian for N compact bodies [20], our explicit formulae for the 2PN and 2.5PN contributions to the two-compact-body equations of motion are new.…”

Section: Introductionmentioning

confidence: 99%

Compact binary systems in scalar-tensor gravity: Equations of motion to 2.5 post-Newtonian order

2013

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We calculate the explicit equations of motion for non-spinning compact objects to 2.5 post- Newtonian order, or O(v/c) 5 beyond Newtonian gravity, in a general class of scalar-tensor theories of gravity. We use the formalism of the Direct Integration of the Relaxed Einstein Equations (DIRE), adapted to scalar-tensor theory, coupled with an approach pioneered by Eardley for incorporating the internal gravity of compact, self-gravitating bodies. For the conservative part of the motion, we obtain the two-body Lagrangian and conserved energy and momentum through second post-Newtonian order. We find the 1.5 post-Newtonian and 2.5 post-Newtonian contributions to gravitational radiation reaction, the former corresponding to the effects of dipole gravitational radiation, and verify that the resulting energy loss agrees with earlier calculations of the energy flux. For binary black holes we show that the motion through 2.5 post-Newtonian order is observationally identical to that predicted by general relativity. For mixed black-hole neutron-star binary systems, the motion is identical to that in general relativity through the first post-Newtonian order, but deviates from general relativity beginning at 1.5 post-Newtonian order, in part through the onset of dipole gravitational radiation. But through 2.5 post-Newtonian order, those deviations in the motion of a mixed system are governed by a single parameter dependent only upon the coupling constant ω0 and the structure of the neutron star, and are formally the same for a general class of scalar-tensor theories as they are for pure Brans-Dicke theory.

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Section: Introductionmentioning

confidence: 99%

Compact binary systems in scalar-tensor gravity: Equations of motion to 2.5 post-Newtonian order

2013

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“…͑1͒ ignores spatial dependence in the spin-diffusion rate, which would be expected due to different electron densities. 23 Furthermore, the geometry of the polarizing region, ͑r͒, is not known. It must not be thicker than the electron wave function transverse to the 2DEG, i.e., a disk rather than a sphere, and it may be closer to a rod than to a disk due to the 1D geometry of the QPC itself.…”

mentioning

confidence: 99%

Nuclear polarization in quantum point contacts in an in-plane magnetic field

Ren

Frolov

et al. 2010

Phys. Rev. B

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Nuclear spin polarization is typically generated in GaAs quantum point contacts ͑QPCs͒ when an out-ofplane magnetic field gives rise to spin-polarized quantum-Hall edge states and a voltage bias drives transitions between the edge states via electron-nuclear flip-flop scattering. Here, we report a similar effect for QPCs in an in-plane magnetic field, where currents are spin polarized but edge states are not formed. The nuclear polarization gives rise to hysteresis in the dc transport characteristics with relaxation time scales around 100 s. The dependence of anomalous QPC conductance features on nuclear polarization provides a useful test of their spin sensitivity.QPCs are the simplest of all semiconductor nanostructures: short one-dimensional ͑1D͒ constrictions between regions of two-dimensional electron gas ͑2DEG͒ with conductance quantized in units of G =2e 2 / h at zero magnetic field and low temperature ͑the factor of 2 comes from spin degen-eracy͒ or 1e 2 / h at high magnetic field when spin degeneracy is broken. 1,2 Despite their apparent simplicity, the spin physics of QPCs has inspired a great deal of debate in the last ten years ever since it was pointed out that their lowconductance transport characteristics ͑G Ͻ 2e 2 / h͒ deviate from a simple noninteracting picture. [3][4][5] One of these anomalous characteristics is a zero-bias conductance peak ͑ZBP͒ observed for G Ͻ 2e 2 / h at low temperature. As the applied magnetic field is increased, some ZBPs collapse without splitting while others split into two peaks by 2g B B, with Landé g factor ranging from much less than the bulk value in GaAs, g = 0.44, to much greater than 0.44. 6-8 The complicated field dependence of ZBPs has given rise to controversial explanations, ranging from Kondo physics 6,9 to a nonspin-related phenomenological model. 8 Despite extensive experimental and theoretical work to understand the electron spin physics of QPCs below the 2e 2 / h plateau, the effects of nuclear spin on QPC conductance have only been studied deep in the quantum-Hall regime, where many of the conductance anomalies disappear. 10,11 Over the last decade, however, it has become increasingly clear that understanding the electron spin physics of semiconductor nanostructures requires a careful consideration of the influence of nuclear spin via the hyperfine interaction. 12,13 This is especially true for nanostructures defined in GaAs and other III-V materials, where large atomic masses lead to a large electron-nuclear coupling constant through the Fermi contact interaction. 14 The hyperfine interaction gives rise to an effective magnetic field acting on electron spin that is proportional to the local nuclear-spin polarization. Significant nuclear polarizations can be built up, also via the hyperfine interaction, when a nonequilibrium population of electron spins relaxes, flipping nuclear spins to conserve angular momentum: a process known as dynamic nuclear polarization ͑DNP͒. 15 For example, a large dc bias applied between spin-polarized edge states in the qua...

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“…In the model, the color confinement used is not the sum of two-body interaction proportional to a color charge λ c i · λ c j but a multibody one, which has been successfully applied to study multiquark systems [14][15][16][17][18]. The study attempts not only to describe the reported charged states and to enrich the list of the possible charged states, but also to provide a new insight to charged states and to reveal the underlying mechanism behind these novel phenomena.…”

Section: Introductionmentioning

confidence: 99%

X(1835),X(2120), andX

Cited by 65 publications

References 63 publications

Compact binary systems in scalar-tensor gravity: Equations of motion to 2.5 post-Newtonian order

Compact binary systems in scalar-tensor gravity: Equations of motion to 2.5 post-Newtonian order

Nuclear polarization in quantum point contacts in an in-plane magnetic field

InterpretingZc(3900)andZc(4025
Deng
¹
,
Ping
²
,
Huang
³

et al. 2014
Phys. Rev. D
Self Cite
77
1
70
0
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X(1835),X(2120), andX

Cited by 65 publications

References 63 publications

Compact binary systems in scalar-tensor gravity: Equations of motion to 2.5 post-Newtonian order

Compact binary systems in scalar-tensor gravity: Equations of motion to 2.5 post-Newtonian order

Nuclear polarization in quantum point contacts in an in-plane magnetic field

InterpretingZc(3900)andZc(4025Deng1, Ping2, Huang3 et al. 2014Phys. Rev. DSelf Cite771700View full textAdd to dashboardCite

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About

InterpretingZc(3900)andZc(4025
Deng
¹
,
Ping
²
,
Huang
³

et al. 2014
Phys. Rev. D
Self Cite
77
1
70
0
View full text Add to dashboard Cite