Next meeting:
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Total votes:
4
(last vote was 2 years ago)
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Total votes:
2
(last vote was 1 year ago)
Title:
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Total votes:
2
(last vote was 1 year ago)
Author:
Discussion leader:
Nobody volunteered yet
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Total votes:
1
(last vote was 3 months ago)
Author:
J. François, L. Ravera
Discussion leader:
Nobody volunteered yet
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Total votes:
1
(last vote was 5 months ago)
Author:
Gerardo Aldazabal, Eduardo Andrés, Anamaría Font, Kumar Narain, Ida G. Zadeh
Discussion leader:
Nobody volunteered yet
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Total votes:
1
(last vote was 1 year ago)
Author:
Claudio Andrea Manzari, Yujin Park, Benjamin R. Safdi, Inbar Savoray
Discussion leader:
Nobody volunteered yet
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Total votes:
1
(last vote was 1 year ago)
Title:
Author:
David Alesini, Danilo Babusci, Paolo Beltrame, Fabio Bossi, Paolo Ciambrone, Alessandro D'Elia, Daniele Di Gioacchino, Giampiero Di Pirro et al.
Discussion leader:
Nobody volunteered yet
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Total votes:
1
(last vote was 1 year ago)
Title:
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Total votes:
1
(last vote was 1 year ago)
Author:
Florian Goertz, Álvaro Pastor-Gutiérrez
Discussion leader:
Nobody volunteered yet
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5 years ago
Title:
Description: https://twitter.com/jc_aurrekoetxea/status/1228253588771737601?s=20
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5 years ago
Title: The ergodicity problem in economics
Link: https://www.nature.com/articles/s41567-019-0732-0
Description: The ergodic hypothesis is a key analytical device of equilibrium statistical mechanics. It underlies the assumption that the time average and the expectation value of an observable are the same. Where it is valid, dynamical descriptions can often be replaced with much simpler probabilistic ones — time is essentially eliminated from the models. The conditions for validity are restrictive, even more so for non-equilibrium systems. Economics typically deals with systems far from equilibrium — specifically with models of growth. It may therefore come as a surprise to learn that the prevailing formulations of economic theory — expected utility theory and its descendants — make an indiscriminate assumption of ergodicity. This is largely because foundational concepts to do with risk and randomness originated in seventeenth-century economics, predating by some 200 years the concept of ergodicity, which arose in nineteenth-century physics. In this Perspective, I argue that by carefully addressi
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5 years ago
Title: new burst signal
Link: https://twitter.com/cplberry/status/1216917328841117696
Description: also https://www.aavso.org/lcg
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5 years ago
Title: glitch in detector. Burst signal retracted
Link: https://twitter.com/cplberry/status/1195116674774716416
Description:
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5 years ago
Title: new source of gws ¿?
Link: https://twitter.com/cplberry/status/1193671270761684992
Description:
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5 years ago
Title: Planck evidence for a closed Universe and a possible crisis for cosmology
Link: https://arxiv.org/pdf/1911.02087.pdf
Description:
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5 years ago
Title: A noninteracting low-mass black hole–giant star binary system
Link: https://science.sciencemag.org/content/366/6465/637
Description: Black hole binary systems with companion stars are typically found via their x-ray emission, generated by interaction and accretion. Noninteracting binaries are expected to be plentiful in the Galaxy but must be observed using other methods. We combine radial velocity and photometric variability data to show that the bright, rapidly rotating giant star 2MASS J05215658+4359220 is in a binary system with a massive unseen companion. The system has an orbital period of ~83 days and near-zero eccentricity. The photometric variability period of the giant is consistent with the orbital period, indicating star spots and tidal synchronization. Constraints on the giant’s mass and radius imply that the unseen companion is 3.3+2.8−0.7 solar masses, indicating that it is a noninteracting low-mass black hole or an unexpectedly massive neutron star.
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5 years ago
Title: Minimal Warm Inflation
Link: https://arxiv.org/abs/1910.07525
Description:
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5 years ago
Title: Gravitational wave signatures of ultralight vector bosons from black hole superradiance
Link: https://arxiv.org/abs/1910.09476
Description: In the presence of an ultralight bosonic field, spinning black holes are unstable to superradiance. The rotational energy of the black hole is converted into a non-axisymmetric, oscillating boson cloud which dissipates through the emission of nearly monochromatic gravitational radiation. Thus, gravitational wave observations by ground- or space-based detectors can be used to probe the existence of dark particles weakly coupled to the Standard Model. In this work, we focus on massive vector bosons, which grow much faster through superradiance, and produce significantly stronger gravitational waves compared to the scalar case. We use techniques from black hole perturbation theory to compute the relativistically-correct gravitational wave signal across the parameter space of different boson masses and black holes masses and spins. This fills in a gap in the literature between flatspace approximations, which underestimate the gravitational wave amplitude in the non-relativistic limit, and
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5 years ago
Title: Gravitational Lensing Signatures of Axion Dark Matter Minihalos in Highly Magnified Stars
Link: https://arxiv.org/abs/1908.01773
Description:
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