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Institut de Física d’Altes Energies (IFAE)
The Institut de Física d’Altes Energies (IFAE) is a consortium of the Generalitat de Catalunya and the Universitat Autònoma de Barcelona (UAB) created in 1991. It has been awarded the “Severo Ochoa Center of Excellence” award twice.

IFAE conducts research, both theoretical and experimental, on the frontier of fundamental physics (high-energy physics, astrophysics, and cosmology) and also in various areas of applied physics, such as medical imaging and quantum computing. For this, it integrates more than one hundred researchers of international origin.

The IFAE is a CERCA research centre and is a member of the Barcelona Institute of Science and Technology (BIST).

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2025-07-04
13:06
45 p, 9.6 MB A 1.8 m Class Pathfinder Raman LIDAR for the Northern Site of the Cherenkov Telescope Array Observatory-Performance / Bauzá Ruiz, Pedro José (Universitat Autònoma de Barcelona. Departament de Física) ; Blanch Bigas, Oscar (Institut de Física d'Altes Energies) ; Calisse, Paolo G. (Cherenkov Telescope Array Observatory gGmbH) ; Campoy-Ordaz, Anna (Universitat Autònoma de Barcelona. Departament de Física) ; Çolak, Sidika Merve (Institut de Física d'Altes Energies) ; Doro, Michele (Istituto Nazionale di Fisica Nucleare) ; Font, Lluís (Universitat Autònoma de Barcelona. Departament de Física) ; Gaug, Markus (Universitat Autònoma de Barcelona. Departament de Física) ; Grau, Roger (Institut de Física d'Altes Energies) ; Kolar, Darko (University of Nova Gorica) ; Maggio, Camilla (Universitat Autònoma de Barcelona. Departament de Física) ; Martínez Rodríguez, Manel (Institut de Física d'Altes Energies) ; Stanič, Samo (University of Nova Gorica) ; Ubach, Santiago (Universitat Autònoma de Barcelona. Departament de Física) ; Zavrtanik, Marko (University of Nova Gorica) ; Živec, Miha (University of Nova Gorica)
The Barcelona Raman LIDAR (BRL) will provide continuous monitoring of the aerosol extinction profile along the line of sight of the Cherenkov Telescope Array Observatory (CTAO). It will be located at its Northern site (CTAO-N) on the Observatorio del Roque de Los Muchachos. [...]
2025 - 10.3390/rs17111815
Remote sensing (Basel), Vol. 17, Issue 11 (June 2025) , art. 1815  
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2025-06-06
10:20
39 p, 3.9 MB Cosmic birefringence from the Axiverse / Gasparotto, Silvia (Universitat Autònoma de Barcelona. Departament de Física) ; Sfakianakis, Evangelos I. (Institut de Física d'Altes Energies)
We revisit the evidence for CMB birefringence in the context of a rich Axiverse. Using probability density functions (PDFs) for various axion parameters, such as the mass and axion decay constant, we construct the PDF for the cosmic birefringence angle and investigate its properties. [...]
2023 - 10.1088/1475-7516/2023/11/017
Journal of Cosmology and Astroparticle Physics, Vol. 2023 (November 2023) , art. 17  
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2025-06-05
14:28
20 p, 6.6 MB Measuring gravitational wave memory with LISA / Inchauspé, Henri (Universität Heidelberg. Institut für Theoretische Physik) ; Gasparotto, Silvia (Universitat Autònoma de Barcelona. Departament de Física) ; Blas Temiño, Diego (Institut de Física d'Altes Energies) ; Heisenberg, Lavinia (Universität Heidelberg. Institut für Theoretische Physik) ; Zosso, Jann (University of Bern. Institute for Theoretical Physics. Albert Einstein Center) ; Tiwari, Shubhanshu (Universität Zürich. Physik-Institut)
Gravitational wave (GW) astronomy has revolutionized our capacity to explore nature. The next generation of observatories, among which the spaceborne detector Laser Interferometer Space Antenna (LISA) is expected to yield orders of magnitude of signal-to-noise-ratio improvement and reach fainter and novel features of general relativity. [...]
2025 - 10.1103/PhysRevD.111.044044
Physical Review D, Vol. 111, Issue 4 (February 2025) , art. 44044  
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2025-06-05
14:28
20 p, 1.3 MB Can gravitational-wave memory help constrain binary black-hole parameters A LISA case study / Gasparotto, Silvia (Institut de Física d'Altes Energies) ; Vicente, Rodrigo (Institut de Física d'Altes Energies) ; Blas Temiño, Diego (Universitat Autònoma de Barcelona. Departament de Física) ; Jenkins, Alexander (University College London. Department of Physics and Astronomy) ; Barausse, Enrico (Scuola Internazionale Superiore di Studi Avanzati (Trieste))
Besides the transient effect, the passage of a gravitational wave also causes a persistent displacement in the relative position of an interferometer's test masses through the nonlinear memory effect. [...]
2023 - 10.1103/PhysRevD.107.124033
Physical Review D, Vol. 107, issue 12 (June 2023) , art. 124033  
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2025-06-05
14:28
32 p, 3.5 MB Axionic defects in the CMB : birefringence and gravitational waves / Ferreira, Ricardo Zambujal (University of Coimbra. Department of Physics) ; Gasparotto, Silvia (Universitat Autònoma de Barcelona. Departament de Física) ; Hiramatsu, Takashi (Rikkyo University. Department of Physics) ; Obata, Ippei (University of Tokyo. Kavli Institute for the Physics and Mathematics of the Universe) ; Pujolàs Boix, Oriol (Institut de Física d'Altes Energies)
The evidence for a non-vanishing isotropic cosmic birefringence in recent analyses of the CMB data provides a tantalizing hint for new physics. Domain wall (DW) networks have recently been shown to generate an isotropic birefringence signal in the ballpark of the measured value when coupled to photons. [...]
2024 - 10.1088/1475-7516/2024/05/066
Journal of Cosmology and Astroparticle Physics, Vol. 2024, issue 5 (May 2024) , art. 66  
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2025-06-05
14:28
24 p, 3.6 MB Searching for ultralight dark matter through frequency modulation of gravitational waves / Blas Temiño, Diego (Institut de Física d'Altes Energies) ; Gasparotto, Silvia (Universitat Autònoma de Barcelona. Departament de Física) ; Vicente, Rodrigo (Institut de Física d'Altes Energies)
Ultralight bosons, naturally appearing in well-motivated extensions to the Standard Model, can constitute all the dark matter. Models with particle mass close to the smallest phenomenologically allowed exhibit coherent field configurations at (sub)galactic scales, oscillating at a frequency corresponding to the fundamental mass of the dark matter particle. [...]
2025 - 10.1103/PhysRevD.111.042008
Physical Review D, Vol. 111, Issue 4 (February 2025) , art. 42008  
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2025-06-03
09:46
47 p, 55.3 MB A 1.8 m Class Pathfinder Raman LIDAR for the Northern Site of the Cherenkov Telescope Array Observatory-Technical Design / Ballester Basols, Otger (Institut de Física d'Altes Energies) ; Blanch Bigas, Oscar (Institut de Física d'Altes Energies) ; Boix, Joan (Institut de Física d'Altes Energies) ; Calisse, Paolo G. (Cherenkov Telescope Array Observatory gGmbH) ; Campoy-Ordaz, Anna (Universitat Autònoma de Barcelona. Departament de Física) ; Çolak, Sidika Merve (Institut de Física d'Altes Energies) ; Da Deppo, Vania (Consiglio Nazionale delle Ricerche) ; Doro, Michele (Istituto Nazionale di Fisica Nucleare) ; Font, Lluís (Universitat Autònoma de Barcelona. Departament de Física) ; Font-Pladevall, Eudald (Universitat Autònoma de Barcelona. Departament de Física) ; Garcia, Rafael (Institut de Física d'Altes Energies) ; Gaug, Markus (Universitat Autònoma de Barcelona. Departament de Física) ; Grau, Roger (Institut de Física d'Altes Energies) ; Kolar, Darko (University of Nova Gorica) ; López Oramas, Alicia (Instituto de Astrofísica de Canarias) ; Maggio, Camilla (Universitat Autònoma de Barcelona. Departament de Física) ; Martínez Rodríguez, Manel (Institut de Física d'Altes Energies) ; Martínez, Òscar (Institut de Física d'Altes Energies) ; Riu-Molinero, Victor (Universitat Autònoma de Barcelona. Departament de Física) ; Roman, David (Institut de Física d'Altes Energies) ; Stanič, Samo (University of Nova Gorica) ; Tartera-Barberà, Júlia (Institut de Física d'Altes Energies) ; Ubach, Santiago (Universitat Autònoma de Barcelona. Departament de Física) ; Zavrtanik, Marko (University of Nova Gorica) ; Živec, Miha (University of Nova Gorica)
This paper presents the technical design of the pathfinder Barcelona Raman LIDAR (pBRL) for the northern site of the Cherenkov Telescope Array Observatory (CTAO-N) located at the Roque de los Muchachos Observatory (ORM). [...]
2025 - 10.3390/rs17061074
Remote sensing (Basel), Vol. 17, Issue 6 (March 2025) , art. 1074  
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2025-05-19
11:10
20 p, 3.1 MB Semiclassical backreaction : a qualitative assessment / van Dissel, Fabio (Institut de Física d'Altes Energies) ; Zahariade, George (Uniwersytet Jagielloński)
The backreaction of quantum degrees of freedom on classical backgrounds is a poorly understood topic in theoretical physics. Most often it is treated within the semiclassical approximation with the help of various ad hoc prescriptions accounting for the effect of quantum excitations on the dynamics of the background. [...]
2025 - 10.1103/PhysRevD.111.065008
Physical Review D, Vol. 111, Issue 6 (March 2025) , art. 065008  
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2025-05-13
12:59
38 p, 3.0 MB Core and halo properties in multi-field wave dark matter / van Dissel, Fabio (Institut de Física d'Altes Energies) ; Hertzberg, Mark P. (Massachusetts Institute of Technology. Department of Physics) ; Shapiro, Jared (Tufts University. Department of Physics and Astronomy.)
In this work, we compute multi-field core and halo properties in wave Dark Matter models. We focus on the case where Dark Matter consists of two light (real) scalars, interacting gravitationally. As in the single-field Ultra Light Dark Matter (ULDM) case, the scalar field behaves as a coherent BEC with a definite ground state (at fixed total mass), often referred to in the literature as a gravitational soliton. [...]
2024 - 10.1088/1475-7516/2024/04/077
Journal of Cosmology and Astroparticle Physics, Vol. 2024, Num. 4 (April 2024) , art. 077  
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2025-05-09
04:24
10 p, 1.5 MB Prompt gamma timing for proton range verification with TlBr and TlCl as pure Cherenkov emitters / Ellin, Justin (University of California Davis) ; Rebolo, Leonor (University of California Davis) ; Backfish, Michael (University of California Davis) ; Prebys, Eric (University of California Davis) ; Ariño-Estrada, Gerard (Institut de Física d'Altes Energies)
Objective. Prompt gamma timing (PGT) uses the detection time of prompt gammas emitted along the range of protons in proton radiotherapy to verify the position of the Bragg peak (BP). Cherenkov detectors offer the possibility of enhanced signal-to-noise ratio (SNR) due to the inherent physics of Cherenkov emission which enhances detection of high energy prompt gamma rays relative to other induced uncorrelated signals. [...]
2024 - 10.1088/1361-6560/ad4304
Physics in Medicine and Biology, Vol. 69, Issue 11 (May 2024) , art. 115002  
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