Savas Dimopoulos
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View article: Toward 48 dB Spin Squeezing and 96 dB Signal Magnification for Cosmic Relic Searches with Nuclear Spins
Toward 48 dB Spin Squeezing and 96 dB Signal Magnification for Cosmic Relic Searches with Nuclear Spins Open
We recently showed that macroscopic nuclear spin ensembles prepared in coherent spin states can dramatically enhance the interaction rates of weakly interacting cosmic relics-such as dark matter and the cosmic neutrino background-through c…
View article: Superradiant interactions of the cosmic neutrino background, axions, dark matter, and reactor neutrinos
Superradiant interactions of the cosmic neutrino background, axions, dark matter, and reactor neutrinos Open
In this paper, we do three things. First, we outline the conditions under which the interaction rate of processes that change the internal state of a system of N targets scales as N2. This is an effect distinct from coherent scattering but…
View article: Superradiant Interactions of the Cosmic Neutrino Background, Axions, Dark Matter, and Reactor Neutrinos
Superradiant Interactions of the Cosmic Neutrino Background, Axions, Dark Matter, and Reactor Neutrinos Open
In this paper we do three things. First, we outline the conditions under which the interaction rate of inelastic processes that change the internal state of a system of $N$ targets scales as $N^2$. This is an effect distinct from coherent …
View article: Cosmic neutrino background on the surface of the Earth
Cosmic neutrino background on the surface of the Earth Open
We argue that the reflection of relic neutrinos from the surface of the Earth results in a significant local $\ensuremath{\nu}\ensuremath{-}\overline{\ensuremath{\nu}}$ asymmetry, far exceeding the expected primordial lepton asymmetry. The…
View article: A Diffraction Grating for the Cosmic Neutrino Background and Dark Matter
A Diffraction Grating for the Cosmic Neutrino Background and Dark Matter Open
We propose structures of size between $\sim 1$ meter to 100 meters that drastically alter the local distribution of the Cosmic Neutrino Background ($CνB$). These structures have a shape reminiscent of a sea urchin: They consist of rods of …
View article: The Cosmic Neutrino Background on the Surface of the Earth
The Cosmic Neutrino Background on the Surface of the Earth Open
We argue that the reflection of relic neutrinos from the surface of the Earth results in a significant local $ν-\barν$ asymmetry, far exceeding the expected primordial lepton asymmetry. The net fractional electron neutrino number $\frac{n_…
View article: Dark QED from inflation
Dark QED from inflation Open
A bstract One contribution to any dark sector’s abundance comes from its gravitational production during inflation. If the dark sector is weakly coupled to the inflaton and the Standard Model, this can be its only production mechanism. For…
View article: THEORIES OF FERMION MASSES
THEORIES OF FERMION MASSES Open
We present grand unified theories in which the quark masses and mixing angles are calculated in terms of the lepton masses through simple group theory. The theories contain no small Yukawa couplings. A favored value of the top quark mass i…
View article: Large-misalignment mechanism for the formation of compact axion structures: Signatures from the QCD axion to fuzzy dark matter
Large-misalignment mechanism for the formation of compact axion structures: Signatures from the QCD axion to fuzzy dark matter Open
Axions are some of the best motivated particles beyond the Standard Model. We show how the attractive self-interactions of dark matter (DM) axions over a broad range of masses, from 10–22 eV to 107 GeV, can lead to nongravitational growth …
View article: MIDAS: A Miniature Device for Real‐Time Determination of the Identity and Energy of Particles in Space
MIDAS: A Miniature Device for Real‐Time Determination of the Identity and Energy of Particles in Space Open
The Miniaturized Detector for Application in Space (MIDAS) device is developed in response to the requirement of the European Space Agency for a device whose size, power consumption, and radiation data output would increase the level of sp…
View article: Black hole mergers and the QCD axion at Advanced LIGO
Black hole mergers and the QCD axion at Advanced LIGO Open
In the next few years Advanced LIGO (aLIGO) may see gravitational waves (GWs)\nfrom thousands of black hole (BH) mergers. This marks the beginning of a new\nprecision tool for physics. Here we show how to search for new physics beyond\nthe…
View article: A 750 GeV QCD axion
A 750 GeV QCD axion Open
We present a model where the 750 GeV resonance plays a fundamental role as the QCD axion. Conformal dynamics and strong CP considerations account for the coincidence of the weak scale, the axion mass, and the scale of spontaneous PQ breaki…
View article: Sound of Dark Matter: Searching for Light Scalars with Resonant-Mass Detectors
Sound of Dark Matter: Searching for Light Scalars with Resonant-Mass Detectors Open
The fine-structure constant and the electron mass in string theory are determined by the values of scalar fields called moduli. If the dark matter takes on the form of such a light modulus, it oscillates with a frequency equal to its mass …