12 citations · 34 across the 21 of their papers we have counts for
21 papers
Probing cosmological phase transitions with SKAO through nano-Hz gravitational-wave portal
Roman Pasechnik, António P. Morais
The recent evidence for a stochastic gravitational wave (GW) background at nano-Hz frequencies from pulsar timing arrays (PTAs) provides a strong science case for exploring cosmolo…
Cosmological Signatures of the Conformal and Non-Conformal Next-to-Minimal Two-Higgs-Doublet Model
Filip Gustavsson, Roman Pasechnik, Johan Rathsman
We investigate cosmological signatures of the next-to-minimal two-Higgs-doublet model (N2HDM) in both the classically scale-invariant, or conformal, realization and in the correspo…
Minimal Scale-Invariant Dark Matter
Alexander Belyaev, Roman Pasechnik, Rishav Roshan +1
We study the minimal classically scale-invariant extension of the Standard Model, containing a single -stabilised real scalar singlet whose mass is not an independent…
Machine Learning for Multi-messenger Probes of New Physics and Cosmology: A Review and Perspective
Andrea Addazi, Konstantin Belotsky, Vitaly Beylin +18
The multi-messenger exploration of dark matter and physics beyond the Standard Model has emerged as a central direction in modern astro-particle physics, particularly following the…
Sterile neutrino dark matter in conformal Majoron models
João Gonçalves, Danny Marfatia, António P. Morais +2
We study sterile neutrino dark matter (DM) in a classically conformal U(1)' extension of the Standard Model with three right-handed neutrinos and a Majoron-like singlet scalar that…
Novel Bounds From The Weak Gravity and Festina Lente Conjectures
Fayez Abu-Ajamieh, Pratik Chattopadhyay, Nobuchika Okada +2
We demonstrate that the Weak Gravity Conjecture (WGC) and the Festina-Lente Conjecture (FLC) yield novel bounds on fifth force searches and milli-Charged Particles (mCPs), as well…
Gravitational Waves from Dark Gauge Sectors
Alexander Belyaev, Mårten Bertenstam, João Gonçalves +3
We explore gravitational-wave (GW) signatures from a strong first-order phase transition in a non-Abelian dark sector, which naturally gives rise to vector dark matter (DM). We con…
Primordial black holes and magnetic fields in conformal neutrino mass models
Shyam Balaji, João Gonçalves, Danny Marfatia +2
Sufficiently strong and long-lasting first-order phase transitions can produce primordial black holes (PBHs) that contribute substantially to the dark matter abundance of the Unive…
Are there minimal exceptional aGUTs from stable 5D orbifolds?
Giacomo Cacciapaglia, Alan S. Cornell, Aldo Deandrea +4
In analysing five dimensional orbifolds with exceptional gauge groups, we seek to find stable vacua configurations which satisfy the minimal requirements for asymptotic grand unifi…
Gravitational waves from color restoration in a leptoquark model of radiative neutrino masses
Mårten Bertenstam, Marco Finetti, António P. Morais +2
We study the first-order phase transitions and the emerging stochastic gravitational wave spectrum in a minimal leptoquark extension of the Standard Model that explains active neut…
Supercooled phase transitions in conformal dark sectors explain NANOGrav data
João Gonçalves, Danny Marfatia, António P. Morais +1
According to recent lore, it is difficult to explain the evidence for a stochastic gravitational wave background obtained by pulsar timing arrays with supercooled first-order phase…
Gravitational waves from supercooled phase transitions in conformal Majoron models of neutrino mass
João Gonçalves, Danny Marfatia, António P. Morais +1
We study supercooled first-order phase transitions above the QCD scale in a wide class of conformal Majoron-like U(1)' models that explain the totality of active neutrino oscillati…
Glueball Axion-Like Particles
Pierluca Carenza, Roman Pasechnik, Zhi-Wei Wang
Dark Yang-Mills sectors that confine to form stable composite states, known as glueballs, have been traditionally proposed as a potential explanation for cosmological Dark Matter (…
Invisible Higgs decay from dark matter freeze-in at stronger coupling
Oleg Lebedev, António P. Morais, Vinícius Oliveira +1
We study the Higgs boson decay into dark matter (DM) in the framework of freeze-in at stronger coupling. Even though the Higgs-DM coupling is significant, up to order one, DM does…
General vacuum stability of orbifold gauge breaking and application to asymptotic grand unification
Giacomo Cacciapaglia, Alan S. Cornell, Aldo Deandrea +4
We examine the vacuum stability of gauge symmetry breaking in five dimensions, compactified on the orbifold. We consider , ,…
Composite heavy axion-like dark matter
Pierluca Carenza, Roman Pasechnik, Zhi-Wei Wang
We propose a novel class of Dark Matter (DM) candidates in the form of a heavy composite Axion-Like Particle (ALP) with highly suppressed electromagnetic interactions populating va…
Model-independent Odderon results based on new TOTEM data on elastic pp collisions at 8 TeV
T. Csörgő, T. Novák, R. Pasechnik +2
Evaluating the H(x, s; pp) scaling function of elastic proton-proton (pp) collisions from recent TOTEM data at sqrt(s) = 8 TeV and comparing it with the same function of elastic pr…
Left-Right model with radiative double seesaw mechanism
Paulo Areyuna C., A. E. Cárcamo Hernández, Vishnudath K. N. +3
We propose an extended Left-Right symmetric model with an additional global symmetry , which after spontaneous symmetry breaking collapses to a residual subgroup $\mathbb{Z…
Gravitational Waves from Composite Dark Sectors
Roman Pasechnik, Manuel Reichert, Francesco Sannino +1
We study under which conditions a first-order phase transition in a composite dark sector can yield an observable stochastic gravitational-wave signal. To this end, we employ the L…
Gravitational waves from a scotogenic two-loop neutrino mass model
Cesar Bonilla, A. E. Cárcamo Hernández, João Gonçalves +3
We propose a framework to account for neutrino masses at the two-loop level. This mechanism introduces new scalars and Majorana fermions to the Standard Model. It is assumed the ex…
Scaling of high-energy elastic scattering and the observation of Odderon
T. Csörgő, T. Novák, R. Pasechnik +2
We provide a statistically significant observation of the elusive Odderon exchange, based on novel and model-independent analysis of the scaling properties of the differential cros…