Tootfinder

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Self-consistent graviton spectral function in Lorentzian quantum gravity
Jan M. Pawlowski, Manuel Reichert, Jonas Wessely
https://arxiv.org/abs/2507.22169 https://

Self-consistent graviton spectral function in Lorentzian quantum gravity
We present the first fully self-consistent computation of the graviton spectral function in quantum gravity, using the spectral renormalisation group for gravity put forward in arXiv:2111.13232v2 [hep-th] within a physical mass-shell renormalisation scheme. Here, self-consistency refers to the fact that the full non-perturbative spectral function is used in the diagrams, including the scattering continuum. We find a positive graviton spectral function with a massless one-graviton peak and a mul…

Signatures of supermassive charged gravitinos in liquid scintillator detectors: #gravitinos be detected by underground detectors?

Tensor induced gravitational waves
Fei-Yu Chen, Jing-Zhi Zhou, Di Wu, Zhi-Chao Li, Peng-Yu Wu
https://arxiv.org/abs/2507.22688 https://arxiv.org/pdf/2507.2…

Tensor induced gravitational waves
Primordial gravitational waves on small scales are not tightly constrained by current cosmological observations, which allows for the possibility of large amplitudes at small scales. We investigate second-order tensor induced gravitational waves (TIGWs) sourced by primordial gravitational waves and present the corresponding corrections to the total energy density spectrum of gravitational wave. We analyze primordial gravitational waves with large amplitudes generated by various models at small …

Echoes of bimodal axial gravitational perturbations in a uniform-density star in Einstein-{\AE}ther gravity
Kai Lin, Wei-Liang Qian, Alan B. Pavan, Amilcar Rabelo de Queiroz, Elcio Abdalla
https://arxiv.org/abs/2507.21321

Echoes of bimodal axial gravitational perturbations in a uniform-density star in Einstein-Æther gravity
This paper studies axial gravitational perturbations of a uniform-density star in scalar-Einstein-Æther theory. By applying the Israel junction conditions explicitly in the presence of a scalar field minimally coupled to the gravitational sector, it is shown that a nontrivial scalar profile cannot be sustained, as it induces a divergence at the stellar center. Since analytical solutions are unattainable, the background metric is determined through numerical integration for a few representative…

Einmal im Leben hatte ich diese Situation: Die Firma hat eine neue Abteilung eingerichtet und ich habe absolut erwartet¹ gefragt zu werden, ob ich in diese neue Abteilung wechseln möchte. Es kam kein derartiges Angebot.
In der neuen Abteilung haben dann nur Männer gearbeitet, die ich alle kannte und mochte.
In meiner Abteilung haben fast nur Frauen gearbeitet und eine von denen hat mich gemobbt.
Und ich fand es angenehmer mit den Frauen zu arbeiten als mit den Männern.
Die Zusam…

Einmal im Leben hatte ich diese Situation: Die Firma hat eine neue Abteilung eingerichtet und ich habe absolut erwartet¹ gefragt zu werden, ob ich in diese neue Abteilung wechseln möchte. Es kam kein derartiges Angebot.
In der neuen Abteilung haben dann nur Männer gearbeitet, die ich alle kannte und mochte.
In meiner Abteilung haben fast nur Frauen gearbeitet und eine von denen hat mich gemobbt.
Und ich fand es angenehmer mit den Frauen zu arbeiten als mit den Männern.
Die Zusam…

QCD-Gravity double copy in Regge asymptotics: from $2\rightarrow n$ amplitudes to radiation in shockwave collisions
Himanshu Raj, Raju Venugopalan
https://arxiv.org/abs/2507.21252

QCD-Gravity double copy in Regge asymptotics: from $2\rightarrow n$ amplitudes to radiation in shockwave collisions
These lectures discuss multi-particle production in QCD and in gravity at ultrarelativistic energies, their double copy relations, and strong parallels in emergent shockwave dynamics. Dispersive techniques are applied to derive the BFKL equation for multi-gluon production in Regge asymptotics. Identical methods apply in gravity and are captured by a gravitational Lipatov equation. The building blocks in both cases are Lipatov vertices and reggeized propagators satisfying double copy relations; …

Testing modified gravity with the eccentric neutron star--black hole merger GW200105
Soumen Roy, Justin Janquart
https://arxiv.org/abs/2507.21315 https://a…

Testing modified gravity with the eccentric neutron star--black hole merger GW200105
Direct detections of gravitational waves offer a unique opportunity to test gravity in the highly dynamical and strong field regime. Current tests are typically performed assuming signals from quasi-circular binaries. However, the complex waveform morphology induced by orbital eccentricity can enhance our ability to probe gravity with greater precision. A recent analysis of the neutron star-black hole event GW200105 identified strong evidence for orbital eccentricity. We extend an eccentric-pre…

Constraints on multi-fluid cosmology in modified Gauss-Bonnet gravity models with different observational data sets
Praveen Kumar Dhankar, Albert Munyeshyaka, Aritra Sanyal, Safiqul Islam, Farook Rahaman
https://arxiv.org/abs/2507.22191

Constraints on multi-fluid cosmology in modified Gauss-Bonnet gravity models with different observational data sets
In the present work, we incorporate redshift-space distortion measurement to investigate the growth of large scale structure within the framework of multi-fluid cosmology in the context of modified Gauss-Bonnet gravity. Using three different modified Gauss-Bonnet gravity models, we compare the predictions of modified Gauss-Bonnet gravity expansion history-through the Friedmann equation with Hubble and BAO data sets and constrain models parameters. Within the context of multi-fluid cosmology in …