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27/07/2021, 09:50
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Chelsea Bartram (University of Washington)27/07/2021, 10:00
I will present recent results from and future plans of the Axion Dark Matter eXperiment (ADMX). Recent results include a first pass axion search of the 800-1020 MHz frequency range at half DFSZ sensitivity for 100% axion dark matter density, the demonstration of a traveling wave parametric amplifier (TWPA) for higher-frequency wide-band operation, and a multi-mode candidate identification...
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Kaliroe Pappas (MIT laboratory for nuclear science)27/07/2021, 10:30
Originally proposed as a solution to the strong CP problem, the axion is also well motivated as a candidate for dark matter. In the less-explored axion mass range below 1 ueV axions behave as long-wavelength dark matter, the search for which requires novel approaches and techniques. With ABRACADABRA-10cm we demonstrate the ability to search for GUT-scale axions in the range of 0.3 to 8 neV...
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Saptarshi Chaudhuri (Princeton University)27/07/2021, 11:00
I present Dark Matter Radio (DMRadio), a multi-faceted program to probe axion dark matter below 1 ueV using an electromagnetic lumped-element resonator. I describe the detection concept and design principles and discuss present experimental status. DMRadio-50L, under construction, will probe axion-like particles in the 20 peV-20 neV mass range. It will serve as a testbed for sensors evading...
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Chanda Prescod-Weinstein (University of New Hampshire)27/07/2021, 14:00
In this talk, I will discuss a range of approaches to better understand ultralight and light scalar dark matter candidates, including axion-like particles. I will discuss results from PySiUltraLight, a modification of the PyUltraLight code that includes self-interaction terms to model the dynamical evolution of axion fields. I will discuss work that shows that the self-interaction should not...
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Manuel A. Buen-Abad (Brown University)27/07/2021, 14:30
Axion couplings to photons could induce photon-axion conversion in the presence of magnetic fields in the Universe. This conversion could impact various cosmic distance measurements, such as luminosity distances to type Ia supernovae and angular distances to galaxy clusters, in different ways. In this talk we consider different combinations of the most up-to-date distance measurements to...
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Jeff Dror (UC Santa Cruz)27/07/2021, 15:00
Existing searches for cosmic axions relics have relied heavily on the axion being non-relativistic and making up dark matter. However, light axions can be copiously produced in the early Universe and remain relativistic today, thereby constituting a Cosmic axion Background (CaB). As prototypical examples of axion sources, we consider thermal production, dark-matter decay, parametric resonance,...
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Dr Francesca Chadha-Day (Durham University)28/07/2021, 10:00
Axion quasiparticles may exist in certain condensed matter systems. I will discuss the physics of axion quasiparticles, and how they may be used to detect axion dark matter via three-way mixing between the photon, axion and axion quasiparticle. I will introduce the proposed TOORAD experiment for TOpolOgical Resonant Axion Detection.
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Christina Gao (Fermilab)28/07/2021, 10:30
Axion (and axion-like-particle), a pseudo-scalar well-motivated in the beyond-the-Standard-Model physics, has a unique two photon vertex, which allows terrestrial experiments to directly look for them from the Sun or as a component of dark matter. Laboratory searches, with both the source and the detection of axion under control, so-called Light-shining-through-walls (LSW), are complementary...
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Andrew Long (Rice University)28/07/2021, 11:00
Axions couple extremely weakly to regular matter, making them challenging to probe in the laboratory. However, axions should be produced in the hot and dense environments of compact stars, providing these stars with an additional cooling channel that leads to well-known constraints on the axion’s couplings to matter. These constraints are indirect, and although compact stars are predicted to...
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Wolfram Ratzinger (University of Mainz)28/07/2021, 14:00
Conventional approaches to probing axions and axion-like particles (ALPs)typically rely on a coupling to photons. However, if this coupling is extremely weak, ALPs become invisible and are effectively decoupled from the Standard Model. We show that such invisible axions, which are viable candidates for dark matter, can produce a stochastic gravitational wave background in the early universe...
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Sam McDermott (Fermilab)28/07/2021, 14:30
The LIGO/Virgo collaboration is making astonishing discoveries at a fantastic pace, including a heavy binary black hole merger with component masses in the “black hole mass gap,” which cannot be explained by standard stellar structure theory. In this talk, I will discuss how new light particles that couple to the Standard Model can act as an additional source of energy loss in the cores of...
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Rachel Houtz (Durham IPPP)28/07/2021, 15:00
In this talk I discuss the gravitational wave signals of dynamical axion models. In particular, I focus on models which solve the strong CP problem and include the confinement of a QCD-like gauge group at the TeV scale. Interestingly, the amplitude of the gravitational wave spectrum depends on the mass of the dynamical axion. The resulting spectra may be observed at future mid-range...
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Norikazu Yamada (KEK)29/07/2021, 09:00
We propose a subvolume method to study the $\theta$ dependence of the free energy density of the four-dimensional SU($N$) Yang-Mills theory on the lattice. As an attempt, the method is first applied to SU(2) Yang-Mills theory at $T=1.2\,T_c$ to understand the systematics of the method. We then proceed to the calculation of the vacuum energy density and obtain the $\theta$ dependence, at...
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Ryutaro Matsudo (KEK Theory Center)29/07/2021, 09:30
In the monopole background, multi-fermion operators exhibit condensation. The phases of the operators are "axions" in the sense that they are topologically coupled to the electromagnetic field. We propose that an ``excited'' closed axion string is the fermion itself. We use this picture to solve a long-standing puzzle in the scattering process of a monopole and a massless fermion. It has been...
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T Daniel Brennan (University of Chicago)29/07/2021, 10:00
Axion models are phenomenologically relevant QFTs that exhibit higher group global symmetries. Higher groups describe the case when different types of higher form symmetries combine together in a non-trivial structure. In this talk, we will discuss how the emergence of these higher groups can be used to infer non-trivial constraints on the RG flows of theories that flow to axion-Yang-Mills in the IR.
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Mohamed Anber (Lewis & Clark College)29/07/2021, 13:00
Axions are conspicuous in particle physics; their role in physics beyond the Standard Model and cosmology cannot be overestimated. Despite the fact that they have been around for more than 40 years, recent formal developments have brought in new lessons on the interplay between axions and strong dynamics. In this talk, I discuss a new class of generalized 't Hooft anomalies that was recently...
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Yohei Ema (DESY)29/07/2021, 13:30
Particle production in strong electromagnetic fields, the Schwinger effect, is a recurring theme in solid state physics, heavy ion collisions, early universe cosmology and formal quantum field theory. In this talk, after reviewing the standard Schwinger effect, we show that the pair production rate of charged fermions in a strong electric field is enhanced in the presence of time dependent...
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Hajime Fukuda29/07/2021, 14:00
The axion has an exact 2pi shift symmetry. The symmetry is a redundancy of the system and the axion can be regarded as a gauge Boson of the redundancy. From this point of view, the axion interaction is the so-called Chern-Simons term, behind which rich dynamics are known to be.
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I will review the axion as the gauge Boson and introduce our work on dynamics of the axion in terms of the... -
Masaki Yamada (Tohoku University)30/07/2021, 09:00
Cosmic birefringence is predicted if an axion-like particle (ALP) moves after the recombination epoch. We show that this naturally happens if the ALP is coupled to the dark matter density because it then acquires a large effective mass after the matter-radiation equality. We give a simple model to realize this scenario, where dark matter is made of hidden monopoles, which give the ALP such a...
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Gustavo Marques-Tavares (University of Maryland)30/07/2021, 09:30
We study new signatures associated with electromagnetic properties of axion strings. We focus
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on charge deposition onto axion strings from electromagnetic fields and
the subsequent novel neutralizing
mechanisms due to bound state formation. While early universe
signatures appear unlikely, there are a plethora of late time
signatures. Axion strings passing through galaxies obtain an... -
Marios Galanis (Stanford University)30/07/2021, 10:00
Black hole superradiance is a powerful probe of light, weakly-coupled hidden sector particles. Particles with a Compton wavelength comparable to the black hole’s radius lead to an instability, extracting mass and angular momentum from the black hole. Many ultralight candidates, such as axions, generically have self-interactions that can influence the evolution of the superradiant instability. ...
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Azadeh Maleknejad (CERN)30/07/2021, 13:00
Modern cosmology has been remarkably successful in describing the universe from a second after the Big Bang until today. However, its physics before that time is still much less certain. It profoundly involves particle theory beyond the Standard Model to explain long-standing puzzles: the origin of the observed matter asymmetry, and massive neutrinos, as well as the particle physics of dark...
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Raymond Co (University of Minnesota)30/07/2021, 13:30
We propose a paradigm where the QCD axion’s unexplored cosmological evolution, a rotation in the field space, gives rise to dark matter, the baryon asymmetry, and/or gravitational waves. The rotation is initiated by explicit Peccei-Quinn (PQ) symmetry breaking effective in the early Universe. The abundance of axion dark matter is determined by the rotational speed via what we call kinetic...
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Isabel Garcia Garcia (KITP)30/07/2021, 14:00
Parity solutions to the strong CP problem are a compelling alternative to approaches based on Peccei-Quinn symmetry, particularly given the expected violation of global symmetries in a theory of quantum gravity. The most natural of these solutions break parity at a low scale, giving rise to a host of experimentally accessible signals. We assess the status of the simplest parity-based solution...
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