arXiv subjects

Adrian Melissinos

Publications and source records attributed to Adrian Melissinos.

8 recordsLinked to original sources

arXiv2022

Proposed Search for a wind of Axion-like-particles using the Gravitational Wave Interferometers

If ALPs exist, the refractive index of light will be modified when light traverses a region where an ALP field is present. We propose to measure the refractive index of light and its angular dependence as the Earth rotates with respect to the direction of the ALP wind. The LIGO Interferometers are sensitive to differences in the refractive index of the light circulating in the two arms, and such differences were recorded during the S5 run, February 2006 to July 2007. They are due in part to the horizontal tidal gradients when they are aligned with one of the arms. In addition a very strong modulation was observed at twice the Earth's orbital frequency as can be seen in Fig.1. This can be understood if the difference in the refractive index between the two arms depends on the angle between the light propagation vector and the direction of the ALP wind. We present the data as a function of the Earth's motion, and discuss the magnitude of the observed refractive index, n-1 ~ 10e-20.

physics.gen-ph↗

arXiv2019

Observation of long-term changes in the effective refractive index of light

During the LIGO S5 run (April 2006 to June 2007) preliminary data from the H1 interferometer recorded long-term changes in the effective refractive index of light over a 14 month period. These are due to the presence of external gravity gradients along the arms of the interferometer. After accounting for the effect of the tides, an unexpected twice-annual modulation was observed.

physics.gen-ph↗

arXiv2018

Possible scheme for observing acceleration (Unruh) radiation

In an FEL the electrons traveling through the undulator are surrounded in their own reference frame by Unruh radiation at a temperature of order 8,000 Kelvin. When these virtual photons scatter from the beam electrons they become real and can be detected. Because of the microbunching of the FEL electron beam this process proceeds coherently for a fraction of the electrons in the microbunch. This enhances the Unruh radiation which is still dominated by the copious spontaneous radiation in the same energy range. We discuss the particular case of the Stanford LCLS, as well as the case of extreme acceleration, when the x-ray beam is brought into collision with the 14 GeV electron beam.

physics.gen-ph↗

arXiv2018

Upper limit on the Stiffness of space-time

From the recently observed propagation of gravitational waves through space-time an upper limit can be deduced for the stiffness of space-time through which the gravitational wave propagates. The upper limit is extremely weak, implying that the stiffness of space-time is at least 14 orders of magnitude weaker than that of jello.

physics.gen-ph↗

arXiv2016

Use of the gravitational-wave interferometers to test Lorentz invariance violation

Currently operating gravitational-wave interferometers are Michelson interferometers with effective arm length L ~ 4x10e5 m. While the interferometer remains in lock, data at the fsr sideband frequency encode information on slow phase changes in the f ~ 10e-5 Hz range, with a fringe sensitivity ~ 10e-10. Preliminary LIGO data presented in 2009 show no Lorentz violating signal at the second harmonic of the Earth's sidereal frequency. This sets a limit on a possible change in refractine index, dn/n < 2x10e-22, an improvement of more than three orders of magnitude over existing limits.

gr-qc↗

arXiv2011

The Sagnac effect and the Tevatron

The Sagnac effect at the Tevatron is large, provided the proton/antiproton momenta are equal to one part per million. This requirement is too stringent.

physics.acc-ph↗

arXiv2010

The response of laser interferometers to a gravitational wave

Laser interferometer detectors are now widely used in an attempt to detect gravitational waves (gw). The interaction of the gw with the light circulating in the interferometer is usually explained in terms of the motion of the "free" mirrors that form the interferometer arms. It is however instructive to show that the same result can be obtained by simply calculating the propagation of an electromagnetic plane wave between "free mirrors" in the curved space-time induced by the gw. One finds that the plane wave acquires frequency modulation sidebands at the gw frequency, as would be expected from the absorption and emission of gravitons from and to the gw. Such sidebands are completely equivalent to the time-dependent phase shift imposed on the plane wave, that follows from the conventional calculation.

gr-qc↗

arXiv2010

The effect of the Tides on the LIGO Interferometers

We present data on the modulation of the dark port power at the free spectral range frequency of the LIGO 4 km interferometers. It is found that the power is modulated exactly at the tidal frequencies to a precision of 6e-9 Hz.

gr-qc↗