A5081245397- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Geophysics and Gravity Measurements
- Atomic and Subatomic Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Computational Physics and Python Applications
- Quantum Chromodynamics and Particle Interactions
- Noncommutative and Quantum Gravity Theories
- Gamma-ray bursts and supernovae
- Quantum, superfluid, helium dynamics
- Solar and Space Plasma Dynamics
- Polish Law and Legal System
- Quantum and electron transport phenomena
- Methane Hydrates and Related Phenomena
- Advanced Frequency and Time Standards
- Astrophysics and Cosmic Phenomena
- Physics of Superconductivity and Magnetism
- Polish Legal and Social Issues
- Oceanographic and Atmospheric Processes
- Relativity and Gravitational Theory
University of Warsaw
2016-2025
University of Łódź
2019-2023
King's College London
2018-2021
University College London
2020
University of London
2020
ARC Centre of Excellence for Particle Physics at the Terascale
2017-2019
The University of Adelaide
2017-2019
Center for Theoretical Physics
2017
University of Michigan–Ann Arbor
2015
We outline the experimental concept and key scientific capabilities of AION (Atom Interferometer Observatory Network), a proposed programme using cold strontium atoms to search for ultra-light dark matter, explore gravitational waves in mid-frequency range between peak sensitivities LISA LIGO/Virgo/ KAGRA/INDIGO/Einstein Telescope/Cosmic Explorer experiments, probe other frontiers fundamental physics. would complement planned searches as well mergers involving intermediate-mass black holes...
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
Cosmic string networks offer one of the best prospects for detection cosmological gravitational waves (GWs). The combined incoherent GW emission a large number loops leads to stochastic background (SGWB), which encodes properties network. In this paper we analyze ability Laser Interferometer Space Antenna (LISA) measure background, considering leading models networks. We find that LISA will be able probe cosmic strings with tensions Gμ ≳ (10−17), improving by about 6 orders magnitude current...
Pulsar timing data used to provide upper limits on a possible stochastic gravitational wave background (SGWB). However, the NANOGrav Collaboration has recently reported strong evidence for common-spectrum process, which we interpret as SGWB in framework of cosmic strings. The signal would correspond string tension $G\mu \in (4 \times 10^{-11}, 10^{-10}) $ at 68% confidence level, with different frequency dependence from supermassive black hole mergers. produced by strings such values $G\mu$...
We analyse a simple extension of the SM with just an additional scalar singlet coupled to Higgs boson. discuss possible probes for electroweak baryogenesis in this model including collider searches, gravitational wave and direct dark matter detection signals. show that large portion parameter space exists where observation waves would allow while indirect searches not.
What is the maximum possible strength of a first-order electroweak phase transition and resulting gravitational wave (GW) signal? While naively one might expect that supercooling could increase to very high values, for strong Universe no longer radiation-dominated vacuum energy unstable minimum potential dominates expansion, which can jeopardize successful completion transition. After providing general treatment nucleation, growth percolation broken bubbles during encompasses case...
The most conservative interpretation of the nHz stochastic gravitational wave background (SGWB) discovered by NANOGrav and other pulsar timing array (PTA) collaborations is astrophysical, namely that it originates from supermassive black hole (SMBH) binaries. However, alternative cosmological models have been proposed, including cosmic strings, phase transitions, domain walls, primordial fluctuations, ``audible'' axions. We perform a multimodel analysis (MMA) to compare how well these...
We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A good fit is found for a string tension $G\ensuremath{\mu}\ensuremath{\sim}{10}^{\ensuremath{-}12}--{10}^{\ensuremath{-}11}$ and intercommutation probability $p\ensuremath{\sim}{10}^{\ensuremath{-}3}--{10}^{\ensuremath{-}1}$. Extrapolation to higher frequencies assuming standard big bang cosmology compatible at the 68% CL with current LIGO/Virgo/KAGRA upper limit on stochastic gravitational wave background...
A bstract Computing the properties of bubble wall a cosmological first order phase transition at electroweak scale is paramount importance for correct prediction baryon asymmetry universe and spectrum gravitational waves. By means semiclassical formalism we calculate velocity thickness using as theoretical framework scalar singlet extension SM with parity symmetry effective field theory supplemented by dimension six operator. We use these solutions to carefully predict wave signals. The...
We estimate the gravitational wave spectra generated in strongly supercooled phase transitions by bubble collisions and fluid motion. derive analytically thin-wall approximation efficiency factor that determines share of energy released transition between scalar field fluid. perform numerical simulations including as a function radius separately for all points on surfaces to take into account their different collision times. find does not significantly change show result can be approximated...
A bstract We study the formation of primordial black holes (PBHs) in strongly super-cooled first-order phase transitions. The mechanism is based on presence remnants dominated by false vacuum that scale slower with expansion Universe than their surroundings where this energy was already converted into radiation. compute PBH from these including contribution and bubble walls, estimating collapse using hoop conjecture considering both regions collapsing immediately when entering horizon...
A bstract We study the possible gravitational wave signal and viability of baryogenesis arising from electroweak phase transition in an extension Standard Model (SM) by a scalar singlet field without ℤ 2 symmetry. first analyze velocity expanding true-vacuum bubbles during transition, confirming our previous finding unbroken symmetry scenario, where bubble wall can be computed principles only for weak transitions with strength parameters α ≲ 0 . 05, Chapman-Jouguet defines maximum which is...
A bstract Many motivated extensions of the Standard Model predict existence cosmic strings. Gravitational waves originating from dynamics resulting string network have ability to probe many otherwise inaccessible properties early universe. In this study we show how spectrum gravitational a can be used test equation state universe prior Big Bang Nucleosynthesis (BBN). We also demonstrate that current and planned wave detectors such as LIGO, LISA, DECIGO/BBO, ET/CE potential detect signals...
We update predictions for the gravitational wave (GW) signal from a strongly supercooled phase transition in an illustrative classically conformal U(1)B−L model. implement ∝ γ2 scaling of friction on bubble wall and estimates efficiency factors GW production collisions plasma-related sources. take into account fact that small decay rate symmetry-breaking field may lead to brief matter-dominated era after transition, as oscillates around its minimum before decaying. find strong collision...
We derive efficiency factors for the production of gravitational waves through bubble collisions and plasma-related sources in strong phase transitions, find conditions under which can contribute significantly to signal. use lattice simulations clarify dependence colliding bubbles on their initial state. illustrate our findings two examples, Standard Model with an extra |H|6 interaction a classically scale-invariant U(1)B−L extension Model. The contribution GW spectrum from is found be...
Cosmic strings are generic cosmological predictions of many extensions the standard model particle physics, such as a $U(1{)}^{\ensuremath{'}}$ symmetry-breaking phase transition in early Universe or remnants superstring theory. Unlike other topological defects, cosmic can reach scaling regime that maintains small fixed fraction total energy density from very epoch until today. If present, they will oscillate and generate gravitational waves with frequency spectrum imprints dominant sources...
Abstract We study gravitational wave (GW) production in strongly supercooled cosmological phase transitions, taking particular care of models featuring a complex scalar field with U(1) symmetric potential. perform lattice simulations two-bubble collisions to properly model the gradients, and compute GW spectrum sourced by them using thin-wall approximation many-bubble simulations. find that case low-frequency is $$\propto \omega $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">...
We study production of gravitational waves (GWs) in strongly supercooled cosmological phase transitions gauge theories. extract from two-bubble lattice simulations the scaling GW source, and use it many-bubble thin-wall limit to estimate resulting spectrum. find that presence field source decays with bubble radius as $\propto R^{-3}$ after collisions. This leads a spectrum follows $\Omega_{\rm GW} \propto \omega^{2.3}$ at low frequencies \omega^{-2.4}$ high frequencies, marking significant...
Hawking evaporation of primordial black holes (PBHs) can facilitate the generation matter-antimatter asymmetry. We focus on ultra-low mass PBHs that briefly dominate universe and evaporate before big bang nucleosynthesis. propose a novel test this scenario by detecting its characteristic doubly peaked gravitational wave (GW) spectrum in future GW observatories. Here first order adiabatic perturbation from inflation isocurvature perturbations due to PBH distribution, source tensor...
A bstract Ultra-low mass primordial black holes (PBH), which may briefly dominate the energy density of universe but completely evaporate before big bang nucleosynthesis (BBN), can lead to interesting observable signatures. In our previous work, we studied generation a doubly peaked spectrum induced stochastic gravitational wave background (ISGWB) for such scenario and explored possibility probing class baryogenesis models wherein emission massive unstable particles from PBH evaporation...
Pulsar timing array collaborations have recently announced the discovery of a stochastic gravitational wave (GW) background at nanohertz frequencies. We analyze GW signals from domination ultralow mass primordial black holes (PBHs) in early Universe and show that they can explain this recent discovery. This scenario requires relatively broad peak power spectrum scalar perturbations inflation with spectral index narrow range 1.45--1.6. The resulting PBH population would around ${10}^{8}\text{...