Limit on Lorentz and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>CPT</mml:mi></mml:math>violation of the proton using a hydrogen maser

Phillips, David F.; Humphrey, M. A.; Mattison, E. M.; Stoner, R. E.; Vessot, R. F. C.; Walsworth, Ronald L.

doi:10.1103/physrevd.63.111101

Cited by 170 publications

(127 citation statements)

References 34 publications

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“…If we assume that the local rest frame is the same as the rest frame of the CMBR, then | v earth | ∼ 10 −3 . The bound on couplings to electrons is ga 0 ∼ 10 −25 GeV [58] and to nucleons ga 0 ∼ 10 −24 GeV [59,60]. These bounds put a strong limit on the combination ga 0 .…”

Section: Constraints From the Axial Vector Currentmentioning

confidence: 99%

Models of baryogenesis via spontaneous Lorentz violation

Carroll

Shu

2006

Phys. Rev. D

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In the presence of background fields that spontaneously violate Lorentz invariance, a matter-antimatter asymmetry can be generated even in thermal equilibrium.In this paper we systematically investigate models of this type, showing that either high-energy or electroweak versions of baryogenesis are possible, depending on the dynamics of the Lorentz-violating fields. In addition to the previously-studied models of spontaneous baryogenesis and quintessential baryogenesis, we identify two scenarios of interest: baryogenesis from a weak-scale pseudo-Nambu-Goldstone boson with intermediate-scale baryon-number violation, and sphaleron-induced baryogenesis driven by a constant-magnitude vector with a late-time phase transition. *

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Section: Constraints From the Axial Vector Currentmentioning

confidence: 99%

Models of baryogenesis via spontaneous Lorentz violation

Carroll

Shu

2006

Phys. Rev. D

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“…This dynamical framework is constructed to contain all Lorentz-and CPT-violating lagrangian terms consistent with coordinate invariance, a fundamental requirement to be discussed below. The SME has provided the basis for numerous experimental Lorentz-and CPT-violation searches involving hadrons [13][14][15], protons and neutrons [16][17][18], electrons [18][19][20][21][22], photons [23][24][25][26][27], muons [28], and neutrinos [8,29,30].…”

Section: Introductionmentioning

confidence: 99%

Threshold analyses and Lorentz violation

Lehnert

2003

Phys. Rev. D

143

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“…The SME is a dynamical model constructed to contain all Lorentz-and CPT-violating lagrangian terms consistent with coordinate independence, which is a fundamental requirement to be discussed below. To date, numerous Lorentz-and CPT-violation tests involving hadrons [8][9][10][11][12][13][14][15][16][17][18][19][20][21], protons and neutrons [22][23][24][25][26][27][28][29][30][31], electrons [31][32][33][34][35][36][37][38][39][40][41], photons [42][43][44][45][46][47], muons [48][49][50], and neutrinos [2,[51][52][53][54] have been analysed or identified within th...…”

Section: Motivationmentioning

confidence: 99%

The Lorentz-Violating Extension of the Standard Model

Lehnert

2004

Beyond the Desert 2003

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Abstract. Quantum-gravity effects are expected to be suppressed by the Planck mass. For experimental progress it is therefore important to identify potential signatures from Planck-scale physics that are amenable to ultrahigh-precision tests. It is argued that minuscule violations of Lorentz and CPT symmetry are candidate signals. In addition, theoretical and experimental aspects of the Standard-Model Extension, which describes the emergent low-energy effects, are discussed. MotivationAn important open question in our understanding of nature at its fundamental level concerns a unified quantum description of all fundamental interactions including gravity. Such a theory is likely to become dominant only as the Planck scale is approached, so that quantum-gravity effects are expected to be minuscule at presently attainable energies. Moreover, the absence of a fully realistic and viable candidate underlying theory provides a major obstacle for the identification of concrete quantum-gravity signatures that can be searched for in present-day or near-future experiments.A possible approach to overcome this phenomenological issue is to determine exact relations in the currently accepted laws of physics that may be violated in prospective fundamental theories and that can be tested with ultrahighprecision. Symmetries typically satisfy these criteria. For example, Lorentz and CPT invariance are cornerstones of our present understanding of nature at the fundamental level, and a variety of Lorentz and CPT tests belong to the most sensitive null experiments available. Lorentz and CPT violation is also a key feature of certain approaches to underlying physics.For example, couplings varying on cosmological scales are one possible source of Lorentz and CPT violation [1]. This fact does not come as a surprise: parameters dependent on spacetime break translational invariance, and translations, rotations, and boosts are linked in the Poincaré group. Thus, violations of translation symmetry can also affect Lorentz invariance. This can be understood intuitively as follows. The equations of motion typically contain the gradient of the coupling, which selects a preferred direction in spacetime leading to apparent Lorentz violation.In this talk, we discuss some theoretical and experimental aspects of the Standard-Model Extension (SME) [2][3][4][5][6][7], which is the low-energy framework for Lorentz-breaking effects. The SME is a dynamical model constructed to contain all Lorentz-and CPT-violating lagrangian terms consistent with coordinate

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Limit on Lorentz andCPTviolation of the proton using a hydrogen maser

Cited by 170 publications

References 34 publications

Models of baryogenesis via spontaneous Lorentz violation

Models of baryogenesis via spontaneous Lorentz violation

Threshold analyses and Lorentz violation

The Lorentz-Violating Extension of the Standard Model

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